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Nitrogen metabolism in crop plants 16. changes in photosynthesis and nitrogen metabolism in relation to leaf area growth of several rice varieties



Nitrogen metabolism in crop plants 16. changes in photosynthesis and nitrogen metabolism in relation to leaf area growth of several rice varieties



Japanese Journal of Crop Science 48(1): 10-16



Using several varieties of rice ecotypes (including Aman, Aus, Tjereh and Bulu Japonica), an attempt was made to clarify the relationships between leaf area growth, light-saturated photosynthetic rate and soluble protein level and furthermore to investigate assimilation of 15N-labeled ammonium N into protein fractions in the leaf blades. In the 11 rice varieties there was negative association between single leaf area and light-saturated photosynthetic rate per unit leaf area. The soluble protein contents per unit leaf area in the leaf blades of varieties which developed smaller single leaf area were much higher than those of the varieties which developed larger single leaf area. Accordingly, there existed strong negative association between single leaf area and soluble protein content in leaf blades. This appeared to explain the negative correlation between single leaf area and photosynthetic rate. 15N-labeled ammonium N assimilation was studied in the 5 rice varieties contrasting in leaf area growth. It was concluded that fraction-1 protein among soluble proteins accumulated more in leaf blades of varieties which developed smaller single leaf area than in varieties with larger single leaf area, because protein synthesis predominated over protein degradation in upper leaf blades and protein degradation was greatly suppressed in lower leaf blades.

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