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ID 49159
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Title Alternative
Effect of Day Length, Supplemental Lighting Strength, Shading Period and Minimum Night Temperature on Occurrence of Abnormal Inflorescence in Gypsophila paniculata ‘Altair’
Author
Yamaguchi, Norihito
Goto, Tanjuro Kaken ID researchmap
Kobiki, Kayoko
Otani, Shoko
Yoshida, Yuichi Kaken ID researchmap
Abstract
As occurrence of abnormal inflorescence in Gypsophila paniculata ‘Altair’ is caused by environmental conditions, effects of day length, supplemental lighting strength, shading period and minimum night temperature on occurrence of abnormal inflorescence were investigated. Abnormal inflorescence was classified into four types : normal, pattern 1 (Short-flower stalk), pattern 2 (Coalescent two-flower stalk) and pattern 3 (Looping and irregular-flower stalk). Neither of 12h, 16h, 20h or 24h day length by fluorescent lamp, nor 24h by incandescent lamp affected occurrence of abnormal inflorescence. Effects of four levels of light intensity (fluorescent lamp : PPFD 1μmol・m−2・s−1, incandescent lamp : PPFD 3μmol・m−2・s−1, metal halide lamp : PPFD 14μmol・m−2・s−1 and high-pressure sodium lamp : PPFD 48μmol・m−2・s−1) were examined in 16h photoperiod. Occurrence of abnormal inflorescence was not affected by different light intensities, neither was it affected by shading period. Occurrence of abnormal inflorescence at 15°C was however significantly reduced compared to that at 8°C. In particular, patterns 2 and 3 at 15°C were significantly reduced compared to those at 8°C. There was a strong negative correlation between average night temperature from starting the treatment to flower budding (7.1°C, 9.0°C, 9.2°C, 11.6°C and 16.4°C) and incidence of pattern 3 (13.1%, 8.7%, 7.1%, 1.1% and 0.7%). Therefore, as average night temperature increased, occurrence of abnormal inflorescence decreased. The results show that low night temperature may be the main factor inducing occurrence of abnormal inflorescence.
Abstract Alternative
シュッコンカスミソウ‘アルタイル’の形態異常花序の発生には環境要因が関与していると考えられたので,日長,補光強度,遮光時期および最低夜温が形態異常花序発生に及ぼす影響を調査した.形態異常程度は4種類のパターン (0:正常,1:茎が短いもの,2:2本の茎が癒着,3:ひどく湾曲し変形したもの) に分類し,その影響を受けた小花の割合を求めた.蛍光灯による日長処理(12時間,16時間,20時間,24時間)や白熱灯による日長処理(自然日長,24時間)は形態異常花序発生率に影響を及ぼさなかった.蛍光灯(PPFD 1μmol・m-2・s-1),白熱灯(PPFD 3μmol・m-2・s-1),メタルハライドランプ(PPFD 14μmol・m-2・s-1),高圧ナトリウムランプ(PPFD 48μmol・m-2・s-1)を用いて16時間の補光を行った.異なる光源による光強度でも形態異常発生率に一定の傾向は認められなかった.遮光時期を変えても形態異常発生率に一定の傾向は認められなかった. 最低夜温を15℃に上げると8℃区と比較して15℃区の形態異常発生は大きく減少した.特にパターン2と3の発生率は大幅に低下した.各実験の処理開始から発蕾までの平均夜温(7.1℃,9.0℃,9.2℃,11.6℃,16.4℃)と,パターン3の形態異常発生率(13.1%,8.7%,7.1%,1.1%,0.7%)との間に高い負の相関(R2=0.849)が認められ,処理開始から発蕾までの平均夜温が高いほど形態異常発生率は低下した.以上のことから,形態異常花序発生には夜間の温度が大きく関与しているのではないかと推察された.
Keywords
abnormal inflorescence pattern
cut flower form
environmental factor
incidence of abnormal inflorescence
low night temperature
Note
原著論文 (Original paper)
Published Date
2013-02-01
Publication Title
岡山大学農学部学術報告
Publication Title Alternative
Scientific Reports of the Faculty of Agriculture Okayama University
Volume
volume102
Publisher
岡山大学農学部
Publisher Alternative
Faculty of Agriculture, Okayama University
Start Page
29
End Page
34
ISSN
2186-7755
Content Type
Departmental Bulletin Paper
language
日本語
File Version
publisher
Refereed
False
Eprints Journal Name
srfa