摘要
研究了苏打盐碱胁迫下水稻剑叶净光合速率日变化及其与影响因子的相互关系,探讨了各因子对剑叶净光合速率的影响。非盐碱和盐碱胁迫下水稻剑叶净光合速率日变化均呈明显双峰曲线,第1次峰值分别出现在上午9:00～10:00和上午9:00,第2次峰值均在下午14:00,中午均出现光合的"午睡"现象,但盐碱胁迫显著降低一天中的净光合速率。相关分析和通径分析表明,9:00～13:00时非盐碱和盐碱胁迫下的水稻剑叶净光合速率与各影响因子的相关性质和相关程度有所不同;在非盐碱胁迫下,对净光合速率影响最大的是气孔导度,其次是气孔限制值,气孔因素是影响净光合速率变化的主要因子;在盐碱胁迫下,对净光合速率影响最大的因子是光强,其次是空气温度,非气孔因素占主导地位。
Relationship between diurnal changes of net photosynthetic rate and affecting factors in flag leaves of rice under saline sodic stress were studied at the full heading stage of rice. The net photosynthetic rate showed a double-peak curve in a day under non-saline sodic and saline sodic stresses. The first peak of net photosynthetic rate appeared at 9：00--10：00 a. m. and 9 ：00 a. m. , respectively and the second peak of net photosynthetic rate both appeared at 14：00 p.m. The midday depression of net photosynthetic rate always appeared regardless of non-saline sodic or saline sodic stress, but net photosynthetic rate at each time decreased significantly in a day under saline sodic stress. There were some differences in correlation character or correlation degree between net photosynthetic rate and all affecting factors at 9：00--13 ：00. Under non-saline sodic stress, diurnal changes of net photosynthetic rate were mainly caused by stomatal conductance and limiting stomatal value and stomatal factors served as determinants for diurnal changes of net photosynthetic rate; whereas under saline sodic stress, diurnal changes of net photosynthetic rate were caused by non-stomatal conductance （light intensity, air temperature） and non-stomatal factors were main for diurnal changes of net photosynthetic rate.
出处
《中国水稻科学》
CAS
CSCD
北大核心
2007年第4期386-390,共5页
Chinese Journal of Rice Science
基金
中国科学院知识创新工程农业重大项目(KZCX1-SW-19-3)
关键词
水稻
盐碱胁迫
净光合速率
日变化
相关性分析
通径分析
rice
saline-sodic stress
net photosynthetic rate
diurnal changes
correlation analysis
path analysis
作者简介
杨福（1965-），男，副研究员。
