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棉花学报  2014 

水分胁迫对棉花幼苗水分利用和光合特性的影响

DOI: 1002-7807(2014)02-0113-09, PP. 113-121

Keywords: 棉花幼苗,水分胁迫,光合,叶绿素荧光

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Abstract:

以转基因棉花品种农大棉8号和鲁棉研28号为材料进行盆栽试验,设置正常处理(CK)、轻度胁迫(LS)、中度胁迫(MS)、重度胁迫(SS)和极度胁迫(ES)5个水分处理。结果表明随着水分胁迫程度的加重,棉花幼苗的生长受到明显的抑制,2个品种的叶片相对含水率、叶水势、净光合速率(Pn)、光能利用率(LUE)、PSⅡ最大光化学效率(Fv/Fm)、PSⅡ光化学量子效率(φPSⅡ)、光化学猝灭系数(qP)呈下降趋势;气孔限制值(Ls)、水分利用率(WUE)和非光化学猝灭系数(NPQ)呈上升趋势。两品种的Pn和NPQ的MS、SS和ES与CK相比差异显著,不同测定时期各胁迫处理的平均Pn比CK分别下降了11.5%、18.1%、32.1%和38.1%;平均NPQ比CK上升了24.1%、50.9%、79.4%和145.1%。表明棉花幼苗期持续轻度水分胁迫对叶片光合能力无显著影响,但高于中度的持续水分胁迫会造成叶片光合能力下降和光抑制加重。

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