水分胁迫对葡萄光合特性的影响

以2年生盆栽葡萄品种品丽珠为试材,分别在50%、40%和30%的土壤最大田间持水量下进行水分胁迫后,测定其光合指标和光合色素含量的变化。研究表明,随胁迫时间的延长,净光合速率(P n)、蒸腾速率(T r)、气孔导度(G s)、胞间CO2浓度(C i)均呈下降趋势;葡萄光合能力随胁迫程度的加重而下降。叶绿素含量随胁迫时间延长和程度加深而降低,叶绿素a/b的值较稳定,类胡萝卜素的变化幅度相对较小。

Effects of water stress on photosynthetic properties of grapevine

The photosynthetic properties of grapevine cultivar Cabernet Franc that were planted in the plastic pots on August,2004 were studied at certain stages under water stress with different soil relative water concentrations(50%,40% and 30%).The photosynthetic indexes and the content of photosynthetic pigments were detected.The results indicated that with the prolonging of water stress,the net photosynthetic rate(Pn),transpiration rate(Tr),stomatal conductance (Gs) and intercellular CO_2 concentration(Ci) declined without exception,and the photosynthetic efficiency of grapevine declined with the aggravating of stress degree.The content of photosynthetic pigments was also reduced with the prolonging of stress time and the aggravating of stress degree.The ratio of Chl.a/Chl.b was comparatively stable,and the changing range of carotenoid was limited.