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首页> 外文期刊>Field Crops Research >Growth, lint yield and changes in physiological attributes of cotton under temporal waterlogging
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Growth, lint yield and changes in physiological attributes of cotton under temporal waterlogging

机译：时涝条件下棉花的生长，皮棉产量和生理特性的变化

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Cotton may suffer from waterlogging from seedling to boll-setting stage, but little is known of how it responds to temporal waterlogging. In this study, cotton was grown in a rain-shelter and subjected to 0 (control)-, 10-, 15- and 20-d waterlogging at squaring (WLS), flowering (WLF) and boll-setting (WLB) stages. The effects of timing (growth stage) and duration of waterlogging on the growth, yield and yield components as well as some physiological and molecular features of cotton were examined. The lint yield was significantly affected by timing and duration of waterlogging as well as their interaction. On average, the 10-, 15-, and 20-d waterlogging reduced lint yield by 53, 59 and 63% at squaring; 27, 37 and 55% at flowering, and 13, 15 and 24% at boll-setting. The more pronounced yield reduction under WLS than later waterlogging (under WLF and WLB) was attributed to greater reductions in biological yield, harvest index, and the resulting boll density and boll weight Variations in yield loss due to temporal waterlogging was associated with some physiological and molecular changes: a) the chlorophyll synthesis associated gene (GhLHCB) in the main-stem leaves was down-regulated under WLS to a larger extent, leading to lower leaf photosynthesis than that under WLF or WLB; b) cotton alcohol dehydrogenase (GhADH) and pyruvate decarboxylase (PDC) genes were better up-regulated, resulting to greater activity of lactate dehydrogenase (LDH), alcohol dehydrogenase (ADH) and PDC plus lower activity of SOD, POD and CAT and higher accumulation of malondialdehyde (MDA) and H2O2 under WLS than under WLF and WLB; c) more pronounced reductions in GA and IAA content were observed under WLS than WLF and WLB. Higher sensitivity to earlier waterlogging than later waterlogging in cotton was attributed to the greater reductions in biological yield and harvest index resulting from differences in physiological and molecular adjustments of the plants. (C) 2016 Elsevier B.V. All rights reserved.
机译：棉花从苗期到结铃期可能会遭受涝灾，但是人们对棉花对暂时性涝灾的反应知之甚少。在这项研究中，棉花在避雨棚中生长，并在平方（WLS），开花（WLF）和结铃（WLB）阶段遭受0（对照），10、15和20d涝渍。研究了浸水的时间（生长阶段）和持续时间对棉花的生长，产量和产量构成以及一些生理和分子特征的影响。浸水的时间和持续时间及其相互作用显着影响了皮棉产量。平均而言，10、15和20天的涝渍在平方时使皮棉产量减少53％，59％和63％。开花时分别为27％，37％和55％，结铃时为13％，15％和24％。在WLS条件下，产量的下降比后来的涝灾（在WLF和WLB下）更为明显，这归因于生物产量，收割指数的进一步降低，以及由此产生的棉铃密度和棉铃重。分子变化：a）在WLS下，主茎叶中的叶绿素合成相关基因（GhLHCB）被下调的程度更大，导致叶片的光合作用低于WLF或WLB。 b）棉醇脱氢酶（GhADH）和丙酮酸脱羧酶（PDC）基因被更好地上调，从而导致乳酸脱氢酶（LDH），醇脱氢酶（ADH）和PDC的活性较高，而SOD，POD和CAT的活性较低，且较高WLS下的丙二醛（MDA）和H2O2的累积量比WLF和WLB下的累积; c）与WLF和WLB相比，在WLS下观察到GA和IAA含量的降低更为明显。棉花对较早渍水的敏感性比较晚渍水的敏感性高，这是由于植物的生理和分子调节的差异导致生物产量和收成指数的下降幅度更大。 （C）2016 Elsevier B.V.保留所有权利。

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