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首页> 外文期刊>Indian Journal of Horticulture >Response of bulb onion (Allium cepa L.) to water stress: photosynthesis, stomatal conductance and osmotic adjustment
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Response of bulb onion (Allium cepa L.) to water stress: photosynthesis, stomatal conductance and osmotic adjustment

机译：鳞茎洋葱（Allium cepa L.）对水分胁迫的响应：光合作用，气孔导度和渗透调节

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摘要

The photosynthetic response, stomatal conductance and osmotic adjustment in three genotypes of onion varying in bulb size viz., SM-11 (small size bulb), N-2-4-1 and Arka Niketan (medium to big size bulb) were studied under three water stress regimes (control, 50% stress and 100% stress) in pot cultured plants. Water stress was imposed 30 days after transplanting for a period of 15 days. Leaf area and bulb growth were considerably decreased during the 15 days stress. The cultivar SM-11 maintained higher photosynthetic rate (Pn) during water stress. The higher osmotic adjustment (0.7 Mpa) was found in SM-11. Though there was a recovery in photosynthetic rate and other physiological components after re-watering, it appears that there was long-term consequence of water stress as indicated by the reduction in final bulb yield in stressed plant. A reduction of 17-26% in yield was observed under 100% stress in Arka Niketan and N-2-4-1, while the minimum yield reduction (15%) was found in SM-11 under the same level of water stress. The study indicates that the genotype SM-11 which has smaller bulb size and narrow and upright leaf orientation has performed better than the other two genotypes which have relatively big bulb size and large leaves under different levels of moisture stress.
机译：研究了三种不同鳞茎大小的基因型洋葱的光合作用，气孔导度和渗透调节，分别是SM-11（小鳞茎），N-2-4-1和Arka Niketan（中大鳞茎）。盆栽植物的三种水分胁迫方式（对照，50％胁迫和100％胁迫）。移植后30天施加了15天的水分胁迫。在15天的胁迫下，叶面积和鳞茎的生长显着下降。水分胁迫期间，SM-11品种保持较高的光合速率（Pn）。在SM-11中发现较高的渗透调节（0.7 Mpa）。再浇水后虽然光合速率和其他生理成分有所恢复，但看来长期存在水胁迫的后果，这可通过胁迫植物最终鳞茎产量的降低来表明。在100％胁迫下，Arka Niketan和N-2-4-1的产量降低了17-26％，而在相同水分胁迫水平下，SM-11的最低产量降低了15％。研究表明，球茎尺寸较小，叶片狭窄而直立的基因型SM-11，在不同的水分胁迫水平下，比球茎尺寸较大且叶片较大的其他两种基因型表现更好。

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