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Comparative behavior of seedlings of sorghum and some tropical legumes in relation to leaf expansion and growth

, : Comparative behavior of seedlings of sorghum and some tropical legumes in relation to leaf expansion and growth. Journal of Agricultural Science 104(3): 625-630

Growth rates were compared of pigeonpea (Cajanus cajan), moth bean (Vigna aconitifolia), mung bean (V. radiata) and sorghum seedlings aged 2-5 wk. The seedling growth rates were analyzed in relation to leaf area development, net photosynthetic rate, N accumulation, nitrate reductase activity and soluble protein content. Growth rates were highest in sorghum and lowest in C. cajan. Leaf area development was very fast in sorghum and very slow in C. cajan. Net photosynthetic rate of sorghum leaves was double that observed for the legume leaves. No significant difference was observed in nitrate reductase activity, N percentage or soluble protein content between sorghum and the legumes. In sorghum, early investment of assimilates into leaf development ensured a higher assimilation of C and N per plant. In the legumes, slow development of leaf area coupled with low photosynthetic rates probably resulted in slow growth of the seedlings. In the legume seedlings, vigor was related to the rates of leaf area expansion. Leaf area expansion rates were not related to the N status of the leaf in the species examined.


DOI: 10.1017/s0021859600044403

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