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Position: Home > Articles > Relationship between diurnal changes of net photosynthetic rate and influencing factors in rice under saline sodic stress. Rice Science 2008,15 (2) 119-124

Relationship between diurnal changes of net photosynthetic rate and influencing factors in rice under saline sodic stress.

作者：

Yang Fu;Liang ZhengWei;Wang ZhiChun;Chen Yuan

单位：

Chinese Academy of Sciences; Changchun 130012; China;Northeast Institute of Geography and Agricultural Ecology

关键词：

air temperature;diurnal activity;heading;leaves;light intensity;photosynthesis;rice;saline sodic soils;stomata;Oryza;Oryza sativa

摘要：

The net photosynthetic rate of flag leaves and influencing factors under saline sodic soil conditions were investigated at the full heading stage of rice. The net photosynthetic rate of rice leaves showed a double-peak curve in a day in both non-saline sodic and saline sodic soil treatments. The first peak of the net photosynthetic rate appeared at 9:00-10:00 and 9:00 in the saline sodic and non-saline sodic soil treatments, respectively, whereas the second peak both at 14:00. The midday depression of the net photosynthetic rate always appeared regardless of non-saline sodic or saline sodic soil conditions. In addition, the net photosynthetic rate significantly decreased in all day under saline sodic conditions compared with that under non-saline sodic conditions. Some differences were observed in correlation characters between the net photosynthetic rate and all influencing factors during 9:00-13:00. Under non-saline sodic conditions, the diurnal changes of the net photosynthetic rate in a day were mainly caused by stomatal conductance, and the limitation value and the stomatal factors served as determinants; whereas under saline sodic stress, the diurnal changes of the net photosynthetic rate in a day were mainly caused by non stomatal factors including light intensity and air temperature.

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Relationship between diurnal changes of net photosynthetic rate and influencing factors in rice under saline sodic stress.

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