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Performance of canola cultivars under drought stress induced by withholding irrigation at different growth stages

机译：不同生育期禁水灌溉引起油菜品种在干旱胁迫下的表现

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摘要

Drought stress is a severe environmental constraint to plant productivity. However, plant species and varieties within species may differ significantly in th eir growth behavior to drought stress. In present study, growth and yield responses of three canola (Brassica napus L.) cultivars (CON-II, CON-III and Dunkeld) to drought stress were investigated under wire house conditions. Drought stress was created by withholding irrigation at critical growth stages viz. seedling, vegetative and reproductive. Results revealed significant differences among canola cultivars, in terms of plant height, number of branches plant -1 , biological yield, number of siliqua plant –1 , number of grains siliqua -1 and grain yield, to tolerate drought stress. Dunkeld and Con-III were found to be better to maintain their growth when drought stress was imposed at seedling and vegetative stages; while, reproductive stage was found more sensitive to limited moisture supply. Overall, Con-III performed better under drought stress at all growth stages compared with other cultivars as explained by higher biological yield , grain yield and number of branches and number of siliqua plant –1 . Current investigations suggested that canola is much sensitive to drought stress at reproductive stage and hence irrigation should not be skipped at this stage for successful production. Moreover, canola cultivar Con-III might be useful for better productions under drought environments.
机译：干旱胁迫是对植物生产力的严重环境限制。但是，植物物种和物种内部的变种在干旱胁迫下的生长行为可能存在显着差异。在目前的研究中，研究了三个油菜（甘蓝型油菜）品种（CON-II，CON-III和Dunkeld）在铁房条件下的生长和产量对干旱胁迫的响应。干旱压力是在关键的生长阶段停止灌溉而产生的。幼苗，营养和生殖。结果表明，双低油菜品种在耐受干旱胁迫方面，在株高，分枝植物-1的数量，生物产量，硅果植物的数量–1，硅果-1的数量和籽粒产量方面存在显着差异。发现在苗期和营养期施加干旱胁迫时，Dunkeld和Con-III可以更好地维持其生长;而生殖阶段对有限的水分供应更为敏感。总体而言，与其他品种相比，Con-III在所有生育阶段的干旱胁迫下表现都更好，这可以解释为更高的生物产量，谷物产量，枝条数和刺槐植物数–1。当前的调查表明，双低油菜籽在生殖阶段对干旱压力非常敏感，因此，在此阶段不应该为了成功的生产而跳过灌溉。此外，油菜品种Con-III可能有助于干旱环境下更好的生产。

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