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草业学报 2010

Na+对渗透胁迫下霸王幼苗光合特性的影响

, PP. 198-203

马清,楼洁琼,王锁民

Keywords: Na+,渗透胁迫,霸王幼苗,光合特性

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Abstract:

在-0.5MPa渗透胁迫下,研究了Na+对多浆旱生植物霸王幼苗光合特性的影响。结果显示,在渗透胁迫下,50mmol/LNaCl的加入使霸王幼苗的叶面积和叶绿素(a+b)含量分别显著增加了105%和33%,净光合速率(Pn)、气孔导度(Gs)以及磷酸烯醇式丙酮酸羧化酶(PEPCase)活性分别显著提高了115%,90%和180%,而胞间CO2浓度(Ci)显著降低了17%;同时,使PSⅡ的潜在活性(Fv/F0)、原初光能转换效率(Fv/Fm)以及光合电子传递速率(ETR)分别显著提高了15%,5%和11%。以上结果表明,Na+能改善渗透胁迫下霸王幼苗的光合作用,从而提高植株的抗胁迫能力。

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