Effects of water deficit on photosynthetic rate and osmotic adjustment in tetraploid wheats

被引:74
|
作者
Rekika, D
Nachit, MM
Araus, JL
Monneveux, P
机构
[1] Ecole Natl Super Agron Montpellier, INRA, UFR Genet & Ameliorat Plantes, F-34060 Montpellier 1, France
[2] Int Ctr Agr Res Dry Areas, Aleppo, Syria
[3] Univ Barcelona, Fac Biol, Dept Biol Vegetal, Unidad Fisiol Vegetal, Barcelona 08028, Spain
关键词
drought tolerance; durum wheat; intercellular CO2 concentration; leaf water status; Triticum; water stress; wild emmer wheat;
D O I
10.1023/A:1006890319282
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Osmotic adjustment, accumulation of soluble saccharides, and photosynthetic gas exchange were studied in five durum wheat (Triticum turgidum L. var. durum) and one wild emmer wheat (Triticum turgidum L. var. dicoccoides) cultivars of contrasting drought tolerance and yield stability. Soil water contents (SWC) were 100, 31, 20, and 12 % of maximum capillary capacity. Under mild water stress (SWC 31 to 20 %), osmotic adjustment capacity and high accumulation of saccharides were found in cv. Cham1, a high yielding and drought tolerant cultivar, and in var. dicoccoides, while lowest values were noted in the durum wheat landraces Oued-Zenati and Jennah-Khotifa. Under more severe water stress (SWC 12 %), the cv. Cham1 maintained higher net photosynthetic rate (P-N) than other genotypes. The observed changes in the ratio intercellular/ambient CO2 concentration (c(i)/c(a)) indicated that under mild and severe water stress, the decrease in P-N was mainly due to stomatal and non-stomatal factors, respectively.
引用
收藏
页码:129 / 138
页数:10
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