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《Acta Agronomica Sinica》 1995-06
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Calcium Can Improve Photosynthesis of Soybean Leaves under Water Stress

Yang Genping Gao Xiangyang Jing Jiahai(Laboratory of Plant Physiology, Northwestern Agricultural University, Yangling, Shaanxi 712100)  
The improvement on photosynthetic rates of soybean (Glycine max cv. Dongxie Xuan) leaves by calcium ions under water stress was studied with soybean seedings grown in three levels of Ca2+concentrations (high Ca2+: 14 mmol/L; medial Ca2+:5 mmol/L; and low Ca2+:0 mmol / L) for 7 days and with soybean seedlings grown in soil-medium pots whose leaves were sprayed with 0.132 mol/L Ca2+. Under osmotic stress (with PEG 6000, -0.5 MPa), the photosynthetic rate of high Ca2+ treatment leaves was the highest among three treatments and that of low Ca2+ treatments was the lowest; moreover, the photosynthetic rates of medial and low Ca2+ leaves had much sharper turn down than that of high Ca2+ leaves during early stress period (24 h), At the same degree of osmotic stress, high Ca2+ treatment leaves had the highest carboxylation efficiency, and its transferring of photosynthetic inhibition from stomatal to nonstomatal limitation took place later than that of medial and low Ca2+ treatments. The photosynthetic rate of soybean seedlings grown in soil-medium pots and sprayed with CaCl2 was improved during water stress period. Higher or Spraying-Ca2+ treatments increased the sensitivity of stpmatal regulation to water stress, while water stress took place, the stomatal resistance increased immediately, thus the water over-consumption was inhibited; however, the relative necessary for cells to maintain membrane system integration under water stress, especially for chloroplasts.
【Fund】: 国家自然科学基金资助项目
【CateGory Index】: S565.1
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