Photosynthetica 2002, 40(1):115-119 | DOI: 10.1023/A:1020175130290

Effect of Seawater on Photosynthesis and Dry Matter Accumulation in Developing Rice Grains

N. Sultana1, T. Ikeda1, M.A. Kashem2
1 Laboratory of Crop Science, Graduate School of Science and Technology, Faculty of Agriculture, Niigata University, Niigata, Japan
2 Laboratories of Molecular Life Sciences, Graduate School of Science and Technology, Faculty of Agriculture, Niigata University, Niigata, Japan

To understand the physiology of rice under seawater salinity, potted rice plants were irrigated with different concentrations of Japan seawater (electrical conductivity 0.9, 5.7, 11.5, or 21.5 mS cm-1) from 10 d after transplanting (DAT) to 35 DAT, and from 75 to 100 DAT. Seawater salinity decreased the net photosynthetic rate, stomatal conductance, intercellular CO2 concentration, transpiration rate, leaf water and osmotic potentials, and relative water content, and increased leaf temperature. The contents of chlorophylls, carotenoids, and total sugars significantly decreased in the leaves but content of non-reducing sugars decreased only slightly. With increasing salinity the Na+ concentration increased, while Ca2+, Mn2+, and K+ concentrations decreased. Salinity decreased the contents of sugars and proteins, dry mass, and rate of dry mater accumulation in developing grains.

Additional key words: Ca; carotenoids; chlorophylls; growth stage; K; Mn; Na; Oryza sativa L.; proteins; salinity; sugars

Published: March 1, 2002  Show citation

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Sultana, N., Ikeda, T., & Kashem, M.A. (2002). Effect of Seawater on Photosynthesis and Dry Matter Accumulation in Developing Rice Grains. Photosynthetica, 40(1), 115-119. doi: 10.1023/A:1020175130290
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