Abstract
Four Indica and five Japonica varieties of rice (Oryza sativa L.) were examined to elucidate their differences in photosynthetic activity and dark respiratory rate as influenced by leaf nitrogen levels and temperatures. The photosynthetic rates of single leaf showed correlations with total nitrogen and soluble protein contents in the leaves. Respiratory rate was also positively correlated with the leaf nitrogen content. When compared at the same level of leaf nitrogen or soluble protein content, the four Indica varieties and one of Japonica varieties, Tainung 67, which have some Indica genes derived from one of its parents, showed higher photosynthetic rates than the remaining four Japonica varieties. At the same photosynthetic rate, the Indica varieties showed lower respiratory rate than Japonica varieties. When the leaf temperature rose from 20°C to 30°C, the photosynthetic rate increased by 18 to 41%, whereas the respiratory rate increased by 100 to 150%. These increasing rates in response to temperature were higher in the Japonica than in the Indica varieties. In this respect, Tainung 67 showed the same behavior as of the other four Japonica varieties.
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Abbreviations
- 30/20 ratios:
-
the ratios of photosynthetic and respiratory rates at 30°C to those at 20°C
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Weng, J.H., Chen, C.Y. Differences between Indica and Japonica rice varieties in CO2 exchange rates in response to leaf nitrogen and temperature. Photosynth Res 14, 171–178 (1987). https://doi.org/10.1007/BF00032321
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DOI: https://doi.org/10.1007/BF00032321