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盐碱胁迫对2个葡萄品种光合及荧光特征的影响(英文)

DOI: 10.3969/j.issn.1000-7091.2012.z1.034, PP. 169-175

Keywords: 盐碱胁迫,光合-光响应曲线,光合特征,荧光特征,葡萄

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Abstract:

土壤盐碱胁迫是限制作物生产力的世界性问题。很多研究关注盐分胁迫或者碱胁迫单因子对作物的影响,盐碱混合胁迫的研究较少。本研究按照研究区自然土壤盐碱主要成分和组成比例(NaCl、Na2SO4、Na2CO3质量混合比例为1∶0.5∶0.5),设置了不同浓度的盐碱处理(0,100,200,400mmol/L),模拟无胁迫、轻度胁迫、中度胁迫和重度胁迫。试验材料为2个葡萄品种克瑞生和摩尔多瓦的3年生实生苗。研究结果表明,轻度盐碱处理能在一定程度上改善2个品种的光合能力。高浓度盐碱胁迫条件下,两品种的净光合速率和气孔导度数值均比对照提高,光合-光响应曲线趋势表现一致。对于克瑞生,光合速率的提高得益于气孔导度和蒸腾速率的提高,但是较低的PSⅡ光化学效率降低了这种惠益。对于摩尔多瓦,较高的PSⅡ光化学效率帮助了其保持较为稳定的净光合速率。2个品种显示了对盐碱胁迫的不同适应性机制。

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