岡山大学埋蔵文化財調査研究センターActa Medica Okayama2004遺跡出士の種子集成図録EN10.18926/70430No potential conflict of interest relevant to this article was reported.MDPIActa Medica Okayama2071-10501512022Interspecific Variability in Growth Characteristics and Phytoremediation of Cu by Free-Floating Azolla Macrophytes497ENMuhammad ShahbazAkhtarDepartment of Environmental Sciences, Forman Christian College UniversitySohaibAslamDepartment of Environmental Sciences, Forman Christian College UniversityAllahDittaDepartment of Environmental Sciences, Shaheed Benazir Bhutto UniversityBedur Faleh A.AlbalawiDepartment of Biology, University of TabukYokoOkiDepartment of Environmental Management Engineering, Graduate School of Environmental and Life Science, Okayama UniversityYoshitakaNakashimaDepartment of Environmental Management Engineering, Graduate School of Environmental and Life Science, Okayama UniversityThe phytoremediation potential of aquatic plants, particularly for Cu, is scarcely reported in the pertinent literature. In this regard, differential growth behavior and phytoaccumulation ability of three free-floating Azolla species (A. japonica, A. pinnata, and A. hybrid) were evaluated in a climatically controlled (a temperature of 25/20 degrees C, light/dark 16/8 h, a light intensity of 60 mu mol m(-2) s(-1), and a relative humidity of 65%) microcosm study. Azolla plants were exposed to solutions having three Cu concentrations (0, 3, and 6 mg L-1) under two incubation periods (4 and 8 days). Different Cu treatments significantly reduced Azolla biomass during both incubation periods and A. pinnata was the most sensitive species. Azolla plants grown in aqueous solutions showed substantial variations in Cu removal capacity. Higher bioconcentration values displayed by Azolla plants indicated that these plants can be deployed as potential plants for Cu removal from Cu contaminated water. Nevertheless, the plants exposed to higher Cu concentrations displayed color changes and root detachment due to Cu phytotoxic effects which may also ultimately lead to plant death. Significant correlations between Cu removed from the aqueous solutions and Cu contents of plant biomass indicated that Cu phytoremediation by Azolla plants was due to the phytoaccumulation mechanism because the removed Cu from aqueous solutions was accumulated in plant biomass. Introduced Azolla species, i.e., A. hybrid, displayed comparable Cu removal efficiency with naturally grown Azolla species, i.e., A. japonica and A. pinnata. Tested Azolla species proved to be suitable candidates to remediate Cu contaminated water and can be deployed for phytoremediation.No potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama382022鹿田遺跡16 ― 第20次調査Ｂ・Ｄ地点 ―（岡山大学病院中央診療棟新営に伴う発掘調査）ENShihoIwasakiArchaeological Research Center, Okayama UniversityYokoOkiNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama362020鹿田遺跡 14 ー第17次調査ー (岡山大学総合研究棟（医学系）新営に伴う発掘調査)ENEtsuyoYamamotoArchaeological Research Center, Okayama UniversityShihoIwasakiArchaeological Research Center, Okayama UniversityYokoOkiOkayama UniversityNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama352019鹿田遺跡13 ー第26次調査ー (医学部動物実験施設改修に伴う発掘調査)ENYujiYamaguchi Archaeological Research Center, Okayama UniversityKentaroMinamiArchaeological Research Center, Okayama UniversityShihoIwasakiArchaeological Research Center, Okayama UniversityYokoOkiNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama342018鹿田遺跡12 : 第20次A地点・25次調査 : 岡山大学病院中央診療棟他新営に伴う発掘調査ENYujiYamaguchi Archaeological Research Center, Okayama UniversityShihoIwasakiArchaeological Research Center, Okayama UniversityTakahiroNozakiArchaeological Research Center, Okayama UniversityYokoOkiGraduate School of Environmental and Life Science, Okayama UniversityNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama332018鹿田遺跡11 : 第24次調査 : 医歯薬融合棟新営に伴う発掘調査ENKentaroMinamiArchaeological Research Center, Okayama UniversityTakahiroNozakiArchaeological Research Center, Okayama UniversityYokoOkiGraduate School of Environmental and Life Science, Okayama UniversityNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama322017鹿田遺跡 10 : 第9・11次調査 : 岡山大学病院病棟新営に伴う発掘調査ENEtsuyoYamamotoArchaeological Research Center, Okayama UniversityArchaeological Research Center, Okayama UniversityArchaeological Research Center, Okayama UniversityYujiYamaguchi Archaeological Research Center, Okayama UniversityYokoOkiNo potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama2187-69402212017岡山地方気象台観測露場移転による気温低下量の推定6164ENTakeshiMiuraGraduate School of Environmental and life Science, Okayama UniversityYuUedaGraduate School of Environmental and life Science, Okayama UniversityHidenoriMoritaGraduate School of Environmental and life Science, Okayama UniversityHidetakaChikamoriGraduate School of Environmental and life Science, Okayama UniversityMasahiroKurokawaYoshitakaNakashimaGraduate School of Environmental and life Science, Okayama UniversityYokoOkiGraduate School of Environmental and life Science, Okayama University10.18926/fest/54863Statistical change in official temperature records at Okayama City caused by relocation of meteorological observation field of Meteorological Agency was evaluated. The observation field of Okayama local meteorological observatory was moved to the Tsushima Campus of Okayama University from the downtown area of Okayama City in March, 2015. Comparison between the air temperature records measured at meteorological agency station and the records at Tanjo Pond in Tsushima Campus, showed 0.56 ℃ drop in annual average before and after relocation. Moreover, comparison between the records of Okayama local meteorological observatory and that at the surrounding meteorological observing 9 stations showed 0.55 ℃ drop in annual average. Those results suggest that the relocation dropped annual average of air temperature by about 0.6 ℃.No potential conflict of interest relevant to this article was reported.岡山大学環境管理センターActa Medica Okayama0917-1533332012サステイナブル・キャンパスを目指して3536ENNo potential conflict of interest relevant to this article was reported.岡山大学環境管理センターActa Medica Okayama0917-1533322010今､キャンパスで求められる環境マネジメントとは?11ENNo potential conflict of interest relevant to this article was reported.岡山大学埋蔵文化財調査研究センターActa Medica Okayama71994津島岡大遺跡 4 ―第5次調査― （大学院自然科学研究科棟新営予定地）ENNo potential conflict of interest relevant to this article was reported.岡山大学環境管理センターActa Medica Okayama0917-1533131991児島湖の環境保全問題1722ENYokoOkiNo potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-9099411999Growth, Yield and Mineral Composition of Three Rice Varieties Cultivated under Salt-Affected Conditions131145ENYokoOkiTadashiAdachiHajimeNarioka10.18926/fest/19737A pot experiment was conducted to study the relative performance of IR 6,KS 282 and IR 10198-66-2 rice varieties cultivated under salt-affected conditions at EC of 6.0,9.0 12.0 dS m(-1) in a sandy clay loam soil havig ECe of 1.6 dS m(-1) treated as control. Six seedlings of 39-day old transplaned to each pot having 12 kg soil. The fertilizer as nitrophos and potassium sulphate at the rate of 57.0, 25.0 and 50.0 mg N,P and K kg(-1) soil respectively was applied at the time of transplanting while zinc sulphate at the rate of 5 mg Zn kg(-1) soil and 43.0 mg N kg(-1) of soil as additional dose were applied 19 and 30 days after transplanting respectively. Normal plant protection measures like number of tillers, panicles, paddy grains, filled and unifilled grains, yield per plant and sterility were recorded and shoot and straw samples were analysed for sodium, potassium, calcium and chloride contents. It was observed that growth and yield of all the varieties were reduced significantly with increasing soil salinity. Na/K and Na/Ca rations in shoot and straw increased significantly with increasing soil salinity. It was also observed that higher values of Na/K and Na/Ca rations in shoots affected growth parameters while higher values of these rations in straw affected yield components and grain yield. However, IR 6 having relatively lower values of Na/K and Na/Ca rations proved to be the most salt-tolerant rice among the three varieties studied.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991312008Phosphorus and Biomass Distribution, and P-efficiency by Diverse Brassica Cultivars Exposed to Adequate and P-stress Environment111119ENYokoOkiTadashiAdachi10.18926/fest/12836To acclimate under orthophosphate (Pi) starved environment, plant species and cultivars display an elegant myriad of Pi-adaptive and rescue responses via reprioritizing internal Pi use and maximizing external Pi acquisition by reprogramming metabolism and restructuring root system architecture.Exploitation of considerable genetic diversity both between and within crop species and harnessing of
these genetic variations can lead us to develop smart plants with improved P-acquisition, growth and yield under P-deprivation. To elucidate the effect of P-stress on plant growth, and P-efficiency under Pstarvation,
14 diverse Brassica cultivars were grown hydroponically in a climatically controlled chamber using sufficient (200 and 400 μM) and stress (10 and 20 μM) P-levels using ammonium phosphate (NH4H2PO4) as a P source. Cultivars showed differential growth behaviour in terms of biomass accumulation (shoot and root dry matter partitioning), percent distribution of Pi-concentration ([P]) and P-contents in plant parts (roots and shoots), and P-efficiency ratio (% PER)(relative shoot growth)
indicating considerable genetic diversity among the tested Brassica cultivars. PER and the proportional
increases in shoot dry matter (SDM) accumulation (SDMmax/SDMmin) in response to the P levels assisted
in categorizing the cultivars into efficient and inefficient utilizers of the absorbed P from an ambient environment. Cultivars were classified into efficient responsive (ER), efficient non-responsive (ENR), non-efficient responsive (NER) and non-efficient non-responsive (NENR) by plotting ordination plots between PER and SDMmax/SDMmin under P-stress environment. Differential PER values at stress P levels corresponds to high P levels suggest that P efficiency mechanisms can be different from one cultivar to another within a give plant species and cultivars exhibiting high PER values are better choice to thrive under P-starvation.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-9099612001Distribution of Mineral Ions in Root and Leaf Tissues and Their Role in Salt Tolerance of Wheat Varieties under Saline Conditions6779ENYokoOkiTadashiAdachi10.18926/fest/11535The distribution on Ca, K, Na and Cl in root and leaves was studied in salt tolerant variety (Chikugo Izumi) and salt sensitive variety (PB-81) of wheat under saline conditions. The plants grown in 5% Hoagland's nutrient solution were subjected to 100 mM NaCl salinity for one week before observation with scanning electron microscope and analysis of selected samples with X-ray microanalyzer. Root growth was not affected in salt tolerant variety but reduced significantly in salt sensitive variety. Shoot growth was reduced in both varieties but much higher in salt sensitive variety. Salinity increased accumulation of Na and Cl in all root cells including vascular cells in salt sensitive variety. Salt tolerant variety not only reduced uptake of Na and Cl under saline conditions but also restricted their accumulation in cortex maintaining vascular cells relatively free of these ions. Salt sensitive variety failed to block transport of Na and Cl from root to leaves leading to much accumulation of these ions in leaves under salinity sterss.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-9099712002Effect of increasing salinity on growth and mineral composition of wheat varieties and role of sodium exclusion capacity in salt tolerance mechanisms99106ENYokoOkiTadashiAdachi10.18926/fest/11534A few wheat varieties including two Japanese wheat varieties were evaluated for their salt tolerance at seeding stage, their behavior to increasing salinity levels and role of Na exclusion capacity in salt tolerance mechanisms. The wheat varieties were grown in nutrient solution and subjected to 0 (control), 25,75 and 125 mM NaCl salinity levels for 7 days. Although the shoot growth was reduced while Na contents were increased progressively with increasing salinity in all varieties, the varieties were quite different in their response. Salt tolerant va rieties maintained less reduction in their root and shoot growth and better water relations in their shoots than salt sensitive varieties under saline conditions. The wheat varieties were quite different in their Na exclusion capacity. Poor growth in salt sensitive varieties might be due to higher accumulation of Na in their shoots resulting from low Na exclusion capacity of roots, higher Na transport to shoot and/or inferior compartmentation capability.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-9099712002The separate or the combined effect of hypoxia and salinity on growth and ionic relations of four wheat varieties9198ENYokoOkiTadashiAdachi10.18926/fest/11532To evaluate hypoxic-salinity tolerance in wheat varieties, three Japanese varieties (Nourin-61, Chikugo Izumi and Shirasagi Komugi, relatively salt tolerant) and one Pakistani variety (Blue Silver, relatively salt sensitive) were grown under control, hypoxia, saline and hypoxic-saline conditions. The results suggested that relatively hypoxia and salt tolerant variety Nourin-61 was capable of producing the highest relative shoot yield under combined stress conditions. On the other hand, relatively sensitive variety to both hypoxia and salinity conditions, could not withstand harmful effects of combined stress. A more close correlation of plant growth characters between salinity and hypoxic-salinity than hypoxia and hypoxic-salinity indicated that varieties with higher salt tolerance would suffer less than varieties with higher hypoxia tolerance under combined stress conditions. And the balance of Na/K ratio in shoot tissues seems to be the major evaluation factor as the tolerant variety when salinity and hypoxia stress occur together.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-9099812003平成13年度学生による授業評価アンケートの集計結果と総括8792ENYokoOki10.18926/fest/11509The committee of academic affairs of the Faculty of Environmental Science and Technology in 2001 planned and carried out "the class evaluation questionnaire survey by students" with original one. The committee has announced the totaling result of this survey, especially concerning both of the class evaluation and the self-estimation of student by themselves, in this paper. It is expected that these contents become the aid of the class improvement in near future.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991212007'Tailoring the Plant to Fit the Soil' in Stead of 'Tailoring the Soil to Fit the Plant' is an Alternate Environmental Sound Strategy to Acclimate Orthophosphate (Pi) Deprivation via Highly Coordinated Classical Pi-Starvation Induced Mechanisms107117ENYokoOkiTadashiAdachi10.18926/fest/11454Acclimation to orthophosphate (Pi) deprivation via highly coordinated Pi-starvation induced (PSI) classical mechanisms such as copious quantities of H(+) and carboxylates (OAs) exudation, remodeling and modification of root architecture by increasing structural and functional plasticity, enhanced uptake rate and increased synthesis of Pi transporters would reduce or eliminate our current overreliance on expensive, polluting, and nonrenewable Pi-fertilizers. These complicated but elegant morphological, physiological, biochemical and molecular adjustments of Pi-starved plants provide an excellent example of how the unique flexibility of plant metabolism and energy transduction helps them to cope in a typically stressful environment. Pi-starved roots possess enhanced H(+)-ATPase and PEPCase which could result in increasing H(+) efflux and OAs exudations in the root vicinity. This would lead to the rhizosphere acidification, which thereby contribute to the solublization and assimilation of mineral Pi from environment. To visualize the dissolution of sparingly soluble Ca-phosphate and rhizospheric pH changes (in situ), genetically diverse Brassica cultivars were grown on agar media. Newly formed Ca-phosphate was suspended in agar containing other essential nutriens. With NH(4)(+) applied as the N source, the precipitate dissolved in the root vicinity and this was ascribed to acidification. No dissolution was occurred with No(3)(-)-nutrition. In order to observe the pH changes at the media-root interface (rhizosphere), an image analysis was carried out after embedding the roots in agar containing bromocresol purple as pH indicator. Efficient cultivar 'Brown Raya' showed greater decrease in pH than P-inefficient 'B.S.A' in the culture media. Hydroponically grown cultivars were compared with respect to P-utilization efficiency (PUE), P-stress factor (PSF), and Ca- and P-uptake at P-starvation. PUE, and Ca- and P-uptake correlated significantly (P<0.01) with biomass accumulation, indicating that higher P-uptake of efficient cultivars was because of their higher Ca-uptake, which in turn was related to their better P-acquisition and PUE. Remodelling of root architecture of efficient cultivars helped the cultivars to establish a better rooting system, which provided basis for tolerance under P-starvation.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991212007From Fate to Faith and Soil to Cell: Estimation of Phosphate (Pi) Uptake Rate, Pi-Uptake Kinetics and Relative Growth Rate are Important Parameters to Scavenge Pi by Brassica Cultivars under P-Starved Environment99106ENYokoOkiTadashiAdachi10.18926/fest/11450As a rule, ion uptake by plant cells and roots has features of saturation kinetics. This is in accordance with the assumption of control, as for example by the number of binding sites of ions (carriers, permeases), or the capacity of the proton efflux pumps, in the plasma membrane and tonoplast. Solute transport across membranes is carrier mediated transport. Protein macromolecules integrated into the membrane matrix seems to be the carriers. The carrier-mediated process is subject to kinetics assumig that the number of carriers (binding sites) in the membranes is limited. Kinetics of ion transport through a membrane is considered equivalent to relationship between an enzyme and its substrate. To obtain plants of different P status, two genetically diverse Brassica cultivars (P-tolerant 'Con-1' and P-sensitive 'Gold Rush') were grown for several weeks in nutrient solution culture media. P-uptake kinetics of the roots with intact plants in short-term experiments by monitoring P depletion in culture media revealed that P-tolerant 'Con-1' cultivar had favorable characteristics for P-uptake because of high I(max) or V(max) and low K(m) or 1/2 I(max) value than P-sensitive 'Gold Rush' cultivar. By plotting relative growth rate (RGR) and internal P-concentration (PNC) among P-tolerant (group I; Brown Raya, Con-1, Rainbow, Dunkled and Peela Raya) and P-sensitive (group II; Toria, Sultan Raya, B.S.A, Toria Selection and Gold Rush) cultivars revealed that group I cultivars showed large metabolic fraction and small structural fraction than group II cultivars which provided basis for P-stress tolerance.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991212007Analyses of the Genetic Parameters (Variability, Heritability, Genetic Advance, Relationship of Yield and Yield Contributing Characters) for some Plant Traits among Brassica Cultivars under Phosphorus Starved Environmental Cues9198ENYokoOkiTadashiAdachi10.18926/fest/11446The potential of a crop favorably respond to breeding/selection and bioengineering programs depends upon the nature and magnitude of genetic variability. For effective selection, information on nature and magnitude of variation in population, association of character with dry matter yield and among themselves and the extent of environmental influence on the expression of these characters are necessary. The estimates of genetic parameters help in understanding the role of various plant traits in establishing the growth behavior of cultivars under a given set of environmental conditions. Genetic analysis leads us to a clear understanding of different morphological, physiological and genetic characters and also the type and extent of their contribution to dry matter yield. Six Brassica cultivars were grown in a P-deficient sandy loam soil for 49 days after sowing. Significant variations were observed for all the characters in all the cultivars used in the experiment. All the characters showed high heritability coupled with high genetic advance. Heritability (h(2)) is an approximate measure of the expression of a character. The highest estimates of broad sense heritability (h(2)= 0.90) and relative expected genetic advance (85.72%) were noted for root dry matter (RDM), while the estimate of expected genetic advance at 10% selection intensity was quite high (ΔG = 85.30c㎡) for leaf area per plant. The estimates of coheritability were positive and relatively higher for rootshoot ratio (RSR) in combination with shoot dry matter (SDM) (coh(2) = 2.002) and phosphorus use efficiency (PUE) (coh(2) = 1.875), whereas coheritability estimates were negative between leaf area per plant and RSR (coh(2) = -0.2010) indicating lack of association between these traits. High heritability with high genetic advance was exhibited by all the studied plant traits of cultivars evidencing that the traits could be further improved through individual plant selection. The innate variations within the Brassica gene-pool impel to drive a concentrated effort to understand the basis of adaptability. Access to the relevant genetic traits and information will provide necessary tools to select the optimal combinations of alleles adapted to local and changing growing environments especially nutrient stress conditions such as phosphorus (P) starvation.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991212007Effects of Brick Burning on Microbial Biomass and C/N Ratio in Selected Soil Profiles in the Eastern Region of Bangladesh8389ENYokoOkiTadashiAdachi10.18926/fest/11443The pH values in the profiles of unburnt (agricultural land) soils were found to increase as a function of soil depth and burning (400 to 1000℃) of the soils increased average pH by 8%. The average sand content of the burnt (soil around brick kilns) soil profiles was increased by 245%, while 39 and 36% decreased the silt and clay contents. Soil organic carbon (Corg) in the unburnt soils (0-20 cm) at different agro-ecological zones in the eastern region of Bangladesh ranged from 0.8 and 1.4%, whereas the content of microbial biomass carbon (Cmic) in the studied unburnt soils ranged between 5 and 7% of the total Corg, suggesting that the microbial biomass releasing considerable amounts of carbon in soil while burning of the soils drastically reduced this contribution to about 1%. The values of soil Cmic in the unburnt soils were approximately 2 to 6 times higher in the topsoils than the subsoils (20-60 cm). Variable rainfall, temperature and soil fertility had an overriding influence, which was reflected by the average minimum (276 μg g(-1)) and maximum (439) amounts of soil Cmic in Moulvibazar and Cox' Bazar sites. The Cmic decreased upon soil burning by 92% of its original average value (346 μg g(-1)) in the soil profile of up to 100 cm. Burning of topsoils strikingly increased the Corg/Cmic ratio by about 6 to 9 times, while reduced the C/N ratio by about 1.5 to 2.5 times. The average loss of Corg, available and total N due to burning of the soils were 66, 72 and 44% (increase over average content of unburnt soil: IOAC), respectively, which suggests that the burning of the soils offset the essential roles of soil microorganisms, reduced soil fertility and soil microbial contribution.No potential conflict of interest relevant to this article was reported.岡山大学環境理工学部Acta Medica Okayama1341-90991212007Characterization and Screening of N(2)-fixing Microorganisms at Maturity Stage in Rhizosphere of Rice Grown in Brahmaputra Alluvium Soil of Bangladesh7781ENYokoOkiTadashiAdachi10.18926/fest/11441Studies on the existing non-symbiotic diazotrophic systems still are the most promising for better use of biological nitrogen fixation (BNF) in agriculture. The possibilities for the extension of nitrogen fixation to rice plants still speculative. The prospect of extension of N(2)-fixation to other plants was originally formulated to simulate the possibilities for the biological use of atmospheric nitrogen in order to overcome the ecological and economical problems of nitrogenous fertilizers. In view of this, the present study was conducted for the characterization and identification of N(2)-fixing bacterial strains at the maturity (110 days) stage in rhizosphere of rice (BR 10, Oryza sativa L.) grown in Brahmaputra Alluvium soil of Bangladesh. The soil is characterized as 'Inceptisol' order and 'Aquept' suborder. It was identified as 'Dhamrai series', had 'silt' texture, pH 6.0 and 6.8 C/N ratio. The present results of the microbial tests on the rice rhizosphere soil demonstrated that out of 401 isolates, only 94 were branded as nitrogen fixing organisms per gram of soil, which is about 23.4% of the total isolates. Based on the selection criteria, four individual strains were selected for identification. Biochemical tests were conducted for proper identification. They were identified as Closteridium spp., Klebsiella spp., Bacillus spp. and Azospirllum spp.No potential conflict of interest relevant to this article was reported.岡山大学農学部Acta Medica Okayama0474-02548711998ギョウギシバの耐塩性における系統間差異155161ENYokoOKiTomoUtsugiNine strains of Cynodon dactylon grass were collected from various habitats as the seaside, the saline soil areas and the roadside. These strains were grown in sand culture under greenhouse at various NaCl treatments, and their growth, morphological variation, mineral contents and rooting were determined. The growth of most strains was increased by Cl concentrations of 1,000 ppm to 3,000 ppm, and addition of NaCl up to 5,000 ppm of Cl concentrations did not affect their growth. Furthermore all strains survived relatively well even when grown with Cl concentrations of 10,000 ppm. With increasing Cl concentrations, Na content in their tissues increased. Especially some strains which were collected from saline areas, had higher Na content in their tissues than those of other strains. It was also found that Cynodon dactylon may possess one mechanism for salt tolerance, which be related to restriction of Na translocation from root to top. Morphological characters of all strains at various NaCl treatments varied widely, and a relation between morphological variation and yield variation was found. In contrast, NaCl treatments significantly affected the rooting and the root growth of Cynodon dactylon.No potential conflict of interest relevant to this article was reported.