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棉花学报  2015 

花铃期不同钾效率基因型棉花对干旱和低钾胁迫的响应差异

DOI: 1002-7807(2015)01-0016-06, PP. 16-21

Keywords: 水钾耦合,棉花,基因型,光合参数,水分利用效率,钾素利用效率

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Abstract:

以钾高效和钾低效基因型棉花(HEG和LEG)为试验材料，研究了最优水肥（W1K1），干旱胁迫（W2K1），低钾胁迫（W1K2），干旱、低钾胁迫（W2K2）对其光合作用及水分、钾素利用率的影响。结果表明干旱显著降低花铃期2种基因型棉花叶片净光合速率（Pn）、气孔导度(Gs)、蒸腾速率(Tr)，导致蕾铃脱落，钾素利用率(KUE)降低，造成棉花减产。施钾促进叶片Pn及水分利用率（WUE）的提高，但基因型间存在差异，LEG叶片WUE与施钾量成正比，HEG相反。低钾胁迫下HEG的Pn、Tr下降，但Pn下降幅度小于Tr，WUE增大。较高的WUE有利于提高棉花Pn，降低蕾铃脱落率，促进钾素的高效吸收和运输。

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