摘要
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。
The effect of Na＋ on the photosynthetic characteristics of seedlings of the succulent xerophyte Zygophyllum xanthoxylum were investigated under-0.5 MPa osmotic stress.Under this stress,the leaf area,chlorophyll （a＋b） content,net photosynthetic rate （Pn）,stomatal conductance （Gs） and phosphoenolpyruvate carboxylase （PEPCase） activity were significantly elevated by 105%,33%,115%,90%,and 180% respectively at 50 mmol/L NaCl,but the intercellular CO2 concentration （Ci） was significantly reduced by 17%.In addition,the potential photosynthetic activity （Fv/F0）,primary light energy conversion efficiency （Fv/Fm）,and photosynthetic electron transport rate （ETR） of PSⅡ were enhanced by 15%,5%,and 11% respectively.These results indicate that,under-0.5 MPa osmotic stress,Na＋ can improve the photosynthesis of Z.xanthoxylum seedlings and enhance the osmotic stress resistance of plants.
出处
《草业学报》
CSCD
北大核心
2010年第3期198-203,共6页
Acta Prataculturae Sinica
基金
"十一五"国家科技支撑计划重点项目(2008BADB3B01)
863计划(2006AA10Z126)
国家自然科学基金(30770347
30671488)资助
关键词
Na+
渗透胁迫
霸王幼苗
光合特性
Na＋
osmotic stress
Zygophyllum xanthoxylum
photosynthetic characters
