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干旱胁迫对紫穗槐幼苗生理生化特性的影响

, PP. 139-145

Keywords: 紫穗槐(Amorpha,fruticosa),干旱胁迫,土壤含水量,抗旱性

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Abstract:

为揭示紫穗槐幼苗在干旱胁迫下的生理生态特性和适应性,以盆栽当年生紫穗槐幼苗为材料,通过人为控制土壤含水量,研究干旱胁迫对其生理生化指标的影响。结果表明随着干旱胁迫程度的加剧,幼苗的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)逐渐下降,水分饱和亏缺(WSD)、水分利用效率(WUE)、超氧化物歧化酶(SOD)活性、过氧化物歧化酶(POD)活性、K含量、可溶性糖和游离脯氨酸含量则显著上升;叶绿素a、叶绿素b、叶绿素总量、类胡萝卜素含量随着土壤含水量的降低逐渐增大,而叶绿素a/叶绿素b无显著变化。这些生理指标反映出幼苗对干旱环境的适应性变化,是其抵御逆境的一种积极调节机制。

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