start-ver=1.4
cd-journal=joma
no-vol=102
cd-vols=
no-issue=3
article-no=
start-page=438
end-page=450
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2025
dt-pub=202505
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=A Curve Fitting Method for Analyzing Starch Granule Size Distributions in Cereals
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Background and Objectives: The size distribution of starch granules is an important factor in determining the functional and nutritional properties of starch. However, a simple, standardized method for their analysis is lacking. Here, we developed an approach for estimating granule size parameters using a Python script that fits curves to volumetric granule size distributions generated using a Coulter counter.
Findings: The bimodal size distribution of starch from most wheat and barley cultivars could be best described with a mixed distribution curve. A log-normal distribution was fitted to the small B-type granules, and a normal distribution was fitted to the large A-type granules, allowing estimation of their relative abundance and size parameters despite their overlapping size distributions. However, the optimal fitting is altered in wheat mutants with large perturbations in B-type granule content. In maize and rice, which have unimodal granule size distributions, size parameters were calculated by fitting a single normal distribution.
Conclusions: Curve fitting is an effective approach for estimating starch granule size parameters in diverse cereals, particularly the Triticeae with A- and B-type granules.
Significance and Novelty: We provide new tools and guidelines for the quantitative analysis of granule size in cereals.
en-copyright=
kn-copyright=
en-aut-name=McNellyRose
en-aut-sei=McNelly
en-aut-mei=Rose
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=BriffaAmy
en-aut-sei=Briffa
en-aut-mei=Amy
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=YiasoumiGeorgia
en-aut-sei=Yiasoumi
en-aut-mei=Georgia
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=UauyCristobal
en-aut-sei=Uauy
en-aut-mei=Cristobal
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=SeungDavid
en-aut-sei=Seung
en-aut-mei=David
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
affil-num=1
en-affil=John Innes Centre
kn-affil=
affil-num=2
en-affil=John Innes Centre
kn-affil=
affil-num=3
en-affil=John Innes Centre
kn-affil=
affil-num=4
en-affil=John Innes Centre
kn-affil=
affil-num=5
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=6
en-affil=John Innes Centre
kn-affil=
END
start-ver=1.4
cd-journal=joma
no-vol=36
cd-vols=
no-issue=5
article-no=
start-page=1142
end-page=1155.e6
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2026
dt-pub=202603
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Compound starch granule formation in grass seeds is associated with distinct temporal patterns of gene expression
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=There is extensive interspecies variation in starch granule morphology in the endosperm of grass species, but the factors underpinning this variation are poorly understood. The two major granule morphology types among species are simple and compound granules, where simple granules arise from a single initiation per amyloplast, and compound granules form from multiple granule initiations. Here, we carried out an extensive survey of seed starch morphology, examining specimens from 105 species within the Pooideae using electron microscopy. This not only expanded our current knowledge of the diversity of starch granule types but also confirmed the homoplasy of simple and compound starch granules. We then selected species representing independent origins of simple (Brachyelytrum japonicum, Phaenosperma globosa, and Brachypodium distachyon) and compound granules (Nardus stricta, Melica altissima, and Calamagrostis brachytricha) for analysis of starch structure and gene expression. There were no clear patterns in starch content, amylopectin structure, or amylose content that could distinguish the two granule types. However, comparative transcriptomics over seed development revealed gene expression patterns associated with granule type, most notably increasing expression of STARCH SYNTHASE 3a (SS3a), STARCH BRANCHING ENZYME 1 (SBE1), and limit dextrinases (LDAs) between 3 and 9 days post anthesis in species with compound granules. Mutation of these genes in rice, which natively produces compound granules, resulted in altered granule shape and/or size. Our work highlights differences in gene expression that could contribute to natural variation in granule morphology within the Pooideae while providing important new starch phenotype and gene expression datasets that can be widely used to study endosperm development.
en-copyright=
kn-copyright=
en-aut-name=Watson-LazowskiAlexander
en-aut-sei=Watson-Lazowski
en-aut-mei=Alexander
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=FeikeDoreen
en-aut-sei=Feike
en-aut-mei=Doreen
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=NgaiQi Yang
en-aut-sei=Ngai
en-aut-mei=Qi Yang
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=EschLara
en-aut-sei=Esch
en-aut-mei=Lara
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=FujitaNaoko
en-aut-sei=Fujita
en-aut-mei=Naoko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=SmithAlison M.
en-aut-sei=Smith
en-aut-mei=Alison M.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=SeungDavid
en-aut-sei=Seung
en-aut-mei=David
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
affil-num=1
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=2
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=3
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=4
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=5
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=6
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=7
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=8
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
en-keyword=amylopectin
kn-keyword=amylopectin
en-keyword=amylose
kn-keyword=amylose
en-keyword=endosperm
kn-keyword=endosperm
en-keyword=grasses
kn-keyword=grasses
en-keyword=starch
kn-keyword=starch
en-keyword=starch granule
kn-keyword=starch granule
en-keyword=transcriptomics
kn-keyword=transcriptomics
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2026
dt-pub=20260409
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Rice EMF3 Alleles Adjust Flower Opening Time to Enhance the Seed Setting Rate Under High Temperature Stress
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=To safeguard global food security against rapid population growth and a warming world, the effective genetic improvement of cereals is imperative. Flower opening time (FOT) critically affects the seed setting rate. In this study, we identified a gene, EARLY-MORNING FLOWERING 3 (EMF3), in which single-nucleotide substitutions strongly modulate FOT in rice in a semi-dominant manner, resulting in wide variation in FOT from earlier to later FOT than the wild-type. EMF3 knock-out mutants showed significantly reduced FOT synchrony and disrupted anther dehiscence, leading to fertilisation failure. EMF3 encodes a plasma membrane-localised polypeptide of 723 amino acids with an armadillo repeat fold and four transmembrane segments. Furthermore, EMF3 is specifically expressed in the anthers starting from nighttime on the day of flowering, with substantial impacts on the transcriptomes of both anther and lodicule, which suggested an exclusive role of EMF3 in flowering events. Modifying EMF3 alleles of O. sativa enabled the adjustment of FOT among Oryza species and subspecies, potentially facilitating cross-fertilisation by overcoming one of the major challenges of inter-specific hybridisation to exploit heterosis. Introducing the EMF3 alleles with the earlier FOT into popular rice cultivars resulted in flowering at an earlier time of day when the temperature was cooler, efficiently increasing seed setting rate under heat stress. This discovery unveils the novel mechanism of anther control of flower opening time through the EMF3 gene, while also enabling the use of EMF3 alleles in breeding strategies for efficient fertilisation for increasing hybrid rice seed production and mitigating future heat-stress damage at flowering.
en-copyright=
kn-copyright=
en-aut-name=IshizakiTakuma
en-aut-sei=Ishizaki
en-aut-mei=Takuma
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=HashidaYoichi
en-aut-sei=Hashida
en-aut-mei=Yoichi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=HirabayashiHideyuki
en-aut-sei=Hirabayashi
en-aut-mei=Hideyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=SasakiKazuhiro
en-aut-sei=Sasaki
en-aut-mei=Kazuhiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=TokunagaHiroki
en-aut-sei=Tokunaga
en-aut-mei=Hiroki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=Simon]AdaEliza Vie M.
en-aut-sei=Simon]Ada
en-aut-mei=Eliza Vie M.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=WakayamaMasataka
en-aut-sei=Wakayama
en-aut-mei=Masataka
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=TakaiToshiyuki
en-aut-sei=Takai
en-aut-mei=Toshiyuki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
en-aut-name=SaitoHiroki
en-aut-sei=Saito
en-aut-mei=Hiroki
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=
en-aut-name=NaganoAtsushi J.
en-aut-sei=Nagano
en-aut-mei=Atsushi J.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=
en-aut-name=SakakibaraHitoshi
en-aut-sei=Sakakibara
en-aut-mei=Hitoshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=11
ORCID=
en-aut-name=KojimaMikiko
en-aut-sei=Kojima
en-aut-mei=Mikiko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=12
ORCID=
en-aut-name=TakebayashiYumiko
en-aut-sei=Takebayashi
en-aut-mei=Yumiko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=13
ORCID=
en-aut-name=KimSung]Ryul
en-aut-sei=Kim
en-aut-mei=Sung]Ryul
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=14
ORCID=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=15
ORCID=
en-aut-name=ThomsonMichael J.
en-aut-sei=Thomson
en-aut-mei=Michael J.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=16
ORCID=
en-aut-name=SugimotoKazuhiko
en-aut-sei=Sugimoto
en-aut-mei=Kazuhiko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=17
ORCID=
en-aut-name=HibaraKen]Ichiro
en-aut-sei=Hibara
en-aut-mei=Ken]Ichiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=18
ORCID=
en-aut-name=IshimaruTsutomu
en-aut-sei=Ishimaru
en-aut-mei=Tsutomu
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=19
ORCID=
affil-num=1
en-affil=Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences (JIRCAS)
kn-affil=
affil-num=2
en-affil=Faculty of Agriculture, Takasaki University of Health and Welfare
kn-affil=
affil-num=3
en-affil=Institute of Crop Science, National Agriculture and Food Research Organization (NARO)
kn-affil=
affil-num=4
en-affil=Biological Resources and Post-Harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS)
kn-affil=
affil-num=5
en-affil=Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences (JIRCAS)
kn-affil=
affil-num=6
en-affil=Plant Breeding, Genetics, and Biotechnology Division, International Rice Research Institute (IRRI)
kn-affil=
affil-num=7
en-affil=Institute for Advanced Biosciences, Keio University
kn-affil=
affil-num=8
en-affil=Plant Breeding, Genetics, and Biotechnology Division, International Rice Research Institute (IRRI)
kn-affil=
affil-num=9
en-affil=Tropical Agriculture Research Front, Japan International Research Center for Agricultural Sciences (JIRCAS)
kn-affil=
affil-num=10
en-affil=Institute for Advanced Biosciences, Keio University
kn-affil=
affil-num=11
en-affil=Graduate School of Bioagricultural Sciences, Nagoya University
kn-affil=
affil-num=12
en-affil=RIKEN Center for Sustainable Resource Science
kn-affil=
affil-num=13
en-affil=RIKEN Center for Sustainable Resource Science
kn-affil=
affil-num=14
en-affil=Rice Breeding Innovations Department, International Rice Research Institute (IRRI)
kn-affil=
affil-num=15
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=16
en-affil=Plant Breeding, Genetics, and Biotechnology Division International Rice Research Institute (IRRI) Metro Manila Philippines
kn-affil=
affil-num=17
en-affil=Institute of Crop Science, National Agriculture and Food Research Organization (NARO)
kn-affil=
affil-num=18
en-affil=18Graduate School of Agricultural Regional Vitalization, Kibi International University
kn-affil=
affil-num=19
en-affil=Biological Resources and Post-Harvest Division, Japan International Research Center for Agricultural Sciences (JIRCAS)
kn-affil=
en-keyword=EARLY-MORNING FLOWERING 3
kn-keyword=EARLY-MORNING FLOWERING 3
en-keyword=flower opening time
kn-keyword=flower opening time
en-keyword=heat stress
kn-keyword=heat stress
en-keyword=rice
kn-keyword=rice
en-keyword=seed setting rate
kn-keyword=seed setting rate
END
start-ver=1.4
cd-journal=joma
no-vol=
cd-vols=
no-issue=
article-no=
start-page=
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2026
dt-pub=20260210
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Starch Synthase 3 isoforms are essential for normal starch granule initiation in wheat endosperm
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=
en-copyright=
kn-copyright=
en-aut-name=DingJinjin
en-aut-sei=Ding
en-aut-mei=Jinjin
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=FahyBrendan
en-aut-sei=Fahy
en-aut-mei=Brendan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=JiangQiantao
en-aut-sei=Jiang
en-aut-mei=Qiantao
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=SeungDavid
en-aut-sei=Seung
en-aut-mei=David
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
affil-num=1
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=2
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=3
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=4
en-affil=State Key Laboratory of Crop Gene Exploration and Utilization in Southwest China, Triticeae Research Institute, Sichuan Agricultural University
kn-affil=
affil-num=5
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
en-keyword=resistant starch
kn-keyword=resistant starch
en-keyword=starch
kn-keyword=starch
en-keyword=starch granule
kn-keyword=starch granule
en-keyword=starch synthase
kn-keyword=starch synthase
en-keyword=wheat
kn-keyword=wheat
END
start-ver=1.4
cd-journal=joma
no-vol=137
cd-vols=
no-issue=9
article-no=
start-page=212
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2024
dt-pub=20240831
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Mutations in starch BRANCHING ENZYME 2a suppress the traits caused by the loss of ISOAMYLASE1 in barley
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=The genetic interactions among starch biosynthesis genes can be exploited to alter starch properties, but they remain poorly understood due to the various combinations of mutations to be tested. Here, we isolated two novel barley mutants defective in starch BRANCHING ENZYME 2a (hvbe2a-1 and hvbe2a-2) based on the starch granule (SG) morphology. Both hvbe2a mutants showed elongated SGs in the endosperm and increased resistant starch content. hvbe2a-1 had a base change in HvBE2a gene, substituting the amino acid essential for its enzyme activity, while hvbe2a-2 is completely missing HvBE2a due to a chromosomal deletion. Further genetic crosses with barley isoamylase1 mutants (hvisa1) revealed that both hvbe2a mutations could suppress defects in endosperm caused by hvisa1, such as reduction in starch, increase in phytoglycogen, and changes in the glucan chain length distribution. Remarkably, hvbe2a mutations also transformed the endosperm SG morphology from the compound SG caused by hvisa1 to bimodal simple SGs, resembling that of wild-type barley. The suppressive impact was in competition with floury endosperm 6 mutation (hvflo6), which could enhance the phenotype of hvisa1 in the endosperm. In contrast, the compound SG formation induced by the hvflo6 hvisa1 mutation in pollen was not suppressed by hvbe2a mutations. Our findings provide new insights into genetic interactions in the starch biosynthetic pathway, demonstrating how specific genetic alterations can influence starch properties and SG morphology, with potential applications in cereal breeding for desired starch properties.
en-copyright=
kn-copyright=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=HisanoHiroshi
en-aut-sei=Hisano
en-aut-mei=Hiroshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=KimJune-Sik
en-aut-sei=Kim
en-aut-mei=June-Sik
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=McNellyRose
en-aut-sei=McNelly
en-aut-mei=Rose
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=OitomeNaoko F.
en-aut-sei=Oitome
en-aut-mei=Naoko F.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=SeungDavid
en-aut-sei=Seung
en-aut-mei=David
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=FujitaNaoko
en-aut-sei=Fujita
en-aut-mei=Naoko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=SatoKazuhiro
en-aut-sei=Sato
en-aut-mei=Kazuhiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
affil-num=1
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=2
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=3
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=4
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=5
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=6
en-affil=John Innes Centre, Norwich Research Park
kn-affil=
affil-num=7
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=8
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
END
start-ver=1.4
cd-journal=joma
no-vol=136
cd-vols=
no-issue=4
article-no=
start-page=94
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2023
dt-pub=202304
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=FLOURY ENDOSPERM 6 mutations enhance the sugary phenotype caused by the loss of ISOAMYLASE1 in barley
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Starch is a biologically and commercially important glucose polymer synthesized by plants as semicrystalline starch granules (SGs). Because SG morphology affects starch properties, mutants with altered SG morphology may be useful in breeding crops with desirable starch properties, including potentially novel properties. In this study, we employed a simple screen for mutants with altered SG morphology in barley (Hordeum vulgare). We isolated mutants that formed compound SGs together with the normal simple SGs in the endosperm and found that they were allelic mutants of the starch biosynthesis genes ISOAMYLASE1 (HvISA1) and FLOURY ENDOSPERM 6 (HvFLO6), encoding starch debranching enzyme and CARBOHYDRATE-BINDING MODULE 48-containing protein, respectively. We generated the hvflo6 hvisa1 double mutant and showed that it had significantly reduced starch biosynthesis and developed shrunken grains. In contrast to starch, soluble ƒ¿-glucan, phytoglycogen, and sugars accumulated to higher levels in the double mutant than in the single mutants. In addition, the double mutants showed defects in SG morphology in the endosperm and in the pollen. This novel genetic interaction suggests that hvflo6 acts as an enhancer of the sugary phenotype caused by hvisa1 mutation.
en-copyright=
kn-copyright=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=HisanoHiroshi
en-aut-sei=Hisano
en-aut-mei=Hiroshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
en-aut-name=GalisIvan
en-aut-sei=Galis
en-aut-mei=Ivan
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=3
ORCID=
en-aut-name=MiuraSatoko
en-aut-sei=Miura
en-aut-mei=Satoko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=4
ORCID=
en-aut-name=CroftsNaoko
en-aut-sei=Crofts
en-aut-mei=Naoko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=5
ORCID=
en-aut-name=TakenakaYuto
en-aut-sei=Takenaka
en-aut-mei=Yuto
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=6
ORCID=
en-aut-name=OitomeNaoko F.
en-aut-sei=Oitome
en-aut-mei=Naoko F.
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=7
ORCID=
en-aut-name=IshimizuTakeshi
en-aut-sei=Ishimizu
en-aut-mei=Takeshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=8
ORCID=
en-aut-name=FujitaNaoko
en-aut-sei=Fujita
en-aut-mei=Naoko
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=9
ORCID=
en-aut-name=SatoKazuhiro
en-aut-sei=Sato
en-aut-mei=Kazuhiro
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=10
ORCID=
affil-num=1
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=2
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=3
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=4
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=5
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=6
en-affil=College of Life Sciences, Ritsumeikan University
kn-affil=
affil-num=7
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=8
en-affil=College of Life Sciences, Ritsumeikan University
kn-affil=
affil-num=9
en-affil=Department of Biological Production, Akita Prefectural University
kn-affil=
affil-num=10
en-affil=Institute of Plant Science and Resources, Okayama University
kn-affil=
END
start-ver=1.4
cd-journal=joma
no-vol=9
cd-vols=
no-issue=
article-no=
start-page=3745
end-page=
dt-received=
dt-revised=
dt-accepted=
dt-pub-year=2019
dt-pub=201936
dt-online=
en-article=
kn-article=
en-subject=
kn-subject=
en-title=
kn-title=Imaging Amyloplasts in the Developing Endosperm of Barley and Rice
en-subtitle=
kn-subtitle=
en-abstract=
kn-abstract=Amyloplasts are plant-specific organelles responsible for starch biosynthesis and storage. Inside amyloplasts, starch forms insoluble particles, referred to as starch grains (SGs). SG morphology differs between species and SG morphology is particularly diverse in the endosperm of Poaceae plants, such as rice (Oryza sativa) and barley (Hordeum vulgare), which form compound SGs and simple SGs, respectively. SG morphology has been extensively imaged, but the comparative imaging of amyloplast morphology has been limited. In this study, SG-containing amyloplasts in the developing endosperm were visualized using stable transgenic barley and rice lines expressing amyloplast stroma-targeted green fluorescent protein fused to the transit peptide (TP) of granule-bound starch synthase I (TP-GFP). The TP-GFP barley and rice plants had elongated amyloplasts containing multiple SGs, with constrictions between the SGs. In barley, some amyloplasts were connected by narrow protrusions extending from their surfaces. Transgenic rice lines producing amyloplast membrane-localized SUBSTANDARD STARCH GRAIN6 (SSG6)-GFP were used to demonstrate that the developing amyloplasts contained multiple compound SGs. TP-GFP barley can be used to visualize the chloroplasts in leaves and other plastids in pollen and root in addition to the endosperm, therefore it provides as a useful tool to observe diverse plastids.
en-copyright=
kn-copyright=
en-aut-name=MatsushimaRyo
en-aut-sei=Matsushima
en-aut-mei=Ryo
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=1
ORCID=
en-aut-name=HisanoHiroshi
en-aut-sei=Hisano
en-aut-mei=Hiroshi
kn-aut-name=
kn-aut-sei=
kn-aut-mei=
aut-affil-num=2
ORCID=
affil-num=1
en-affil= Institute of Plant Science and Resources, Okayama University
kn-affil=
affil-num=2
en-affil= Institute of Plant Science and Resources, Okayama University
kn-affil=
END