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草业学报  2014 

干旱胁迫及复水对玉簪生长和光合作用的影响

DOI: 10.11686/cyxb20140120, PP. 167-176

Keywords: 玉簪,干旱胁迫,复水,生长,光合作用

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Abstract:

以东北玉簪和紫萼玉簪为材料,研究了干旱胁迫及复水对玉簪干物质量、部分形态指标、叶绿素含量、气体交换和叶绿素荧光参数的影响,结果表明,随干旱胁迫时间的延长和干旱程度的增加,干旱胁迫处理对2种玉簪干物质量、部分形态指标、叶绿素含量的抑制作用逐渐增大。此外,干旱胁迫处理能够降低或显著降低2种玉簪的净光合速率(Pn)、气孔导度(Gs)、蒸腾速率(Tr),降低或升高胞间CO2浓度(Ci);降低或显著降低PSII最大光能转化效率(Fv/Fm)、光适应下PSII最大光能转化效率(Fv'/Fm')、PSII电子传递量子效率(ΦPSII)和光化学猝灭系数(qP),显著提高非光化学猝灭系数(NPQ)。而干旱胁迫处理15或30d后复水15d,各指标均能得到不同程度的恢复;30d的干旱胁迫未造成光合细胞器的不可逆损伤。2种玉簪相关生理指标的比较分析结果显示,东北玉簪抗旱能力强于紫萼玉簪。

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