江西农业大学学报2011，Vol.33Issue(4)：731-737,7.
干旱胁迫对乌桕幼苗光合色素及光合性能的影响
Effect of Drought Stress on Photosynthetic Pigment and Photosynthesis of Sapium sebiferum Seedlings
摘要
Abstract
Effect of drought stress on photosynthetic pigment and photosynthesis of Sapium sebiferum Seed lings was studied by water control experiment. The results showed that the changes in chlorophyll a, chloro phyll b,and chlorophyll ( a + b) contents of S. Sebiferum seedings from GC2,SC4,HS1 and XN1 provenances were consistent with drought time extended, and the changes were not significant(p >0.05)during the drought period. Meanwhile the carotenoid increased significantly (p<0.05) ,this illuminated that drought stress accel erated the synthesis of the carotenoid. The contents of both chlorophyll, and carotenoid from HZ2 provenances droped rapidly under drought stress, but reversed afterwatering. Net photosynthetic rate(Pn) and the stomatal conductance (G,) of seedings showed the tendency of decreasing under drought stress. Correlation analysis showed that Pn was significantly positively correlated to Gs and Tr(p <0. 01) , the correlation coefficients (R) were 0.642,0.728, respectively. Correlation was not significant between Pn and photosynthetic pigment(p > 0.05) ,so the decline of Pn could be due to the stomatal restriction and the decrease of intercellular CO2 con centration (Ci) , and did not result from the decline of photosynthetic pigment content.关键词
乌桕/干旱胁迫/光合色素/光合作用Key words
Sapium sebiferum/ drought stress/ photosynthetic pigment/ photosynthesis分类
农业科技引用本文复制引用
金雅琴,张丽娟,李冬林,王磊..干旱胁迫对乌桕幼苗光合色素及光合性能的影响[J].江西农业大学学报,2011,33(4):731-737,7.基金项目
江苏省自然科学基金资助项目(BK2010094)和国家林业局林业公益性行业科研专项(201004091) （BK2010094）
