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首页> 外文期刊>Journal of Agronomy and Crop Science/Zeitschrift fur acker-und pflanzenbau >Low Incident Light Combined with Partial Waterlogging Impairs Photosynthesis and Imposes a Yield Penalty in Cotton
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Low Incident Light Combined with Partial Waterlogging Impairs Photosynthesis and Imposes a Yield Penalty in Cotton

机译：低入射光与部分渍水的结合会损害光合作用，并对棉花造成增产损失

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摘要

Through field studies, cotton responses to dual stresses - waterlogging and low light (shade) were investigated. The hypothesis was that shade would amplify yield losses in waterlogged (WL) cotton. Either early or late in the reproductive phase, the crop was WL (96h and 120h, in 2012-2013 and 2013-2014, respectively) and/or shaded (6days or 9days in 2012-2013 and 2013-2014, respectively). Waterlogging at early reproductive phase significantly reduced lint yield (17% averaged across both years) of cotton, although shade-induced yield losses (18%) were only significant in 2013-2014. Shade significantly exacerbated yield losses only when the impact of waterlogging damage was modest (2013-2014). More intense waterlogging impaired lint yield independently of the light levels. Yield reductions in these experiments were the consequence of both accelerated fruit abscission and fewer fruiting nodes produced. Plants had lower leaf nitrogen levels and photosynthetic rates after waterlogging and/or shade treatments and produced fewer fruiting nodes. Although long-term shade increased specific leaf area (30%) and leaf N (20%) immediately following 5days of waterlogging, it did not restore shoot growth, node formation or lint yield because of suppressed photosynthetic performance (area basis) and carbohydrate supply.
机译：通过田间研究，调查了棉花对双重胁迫的响应-渍水和弱光（阴影）。假设是，遮阴会增加浸水（WL）棉花的产量损失。在生殖阶段的早期或晚期，农作物为WL（分别在2012-2013年和2013-2014年为96h和120h）和/或被遮蔽（2012-2013年和2013-2014年分别为6天或9天）。生殖早期的涝渍显着降低了棉花的皮棉产量（两个年度的平均水平为17％），尽管在荫凉下引起的单产损失（18％）仅在2013-2014年间显着。仅在渍水损害的影响不大时（2013-2014年），树荫才会显着加剧产量损失。更强的渍水能力会降低皮棉产量，而与光照水平无关。这些实验中的产量降低是水果脱落加速和结实果实减少的结果。涝渍和/或遮荫处理后，植物的叶氮水平和光合速率降低，结实节点减少。尽管长期淹水在淹水5天后立即增加了比叶面积（30％）和叶N（20％），但由于抑制了光合作用（基于面积）和碳水化合物的供应，因此无法恢复枝条生长，节形成或皮棉产量。 。

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