Ontogenetic changes of photosynthetic and dark respiration rates in relation to nitrogen content in individual leaves of field crops
2001
Osaki, M. | Shinano, T. | Kaneda, T. | Yamada, S. | Nakamura, T. (Hokkaido Univ., Sapporo (Japan). Graduate School of Agriculture)
Ontogenetic changes of rates of photon-saturated photosynthesis (Psat) and dark respiration (RD) of individual leaves were examined in relation to nitrogen content (Nc) in rice, winter wheat, maize, soybean, field bean, tomato, potato, and beet. PsB, was positively correlated with Nc as follows: Psat = Cf Nc + Psat, where Cf and Psat are coefficients. The value of Cf was high in maize, medíum in rice and soybean, and low in field bean, potato, tomato, and beet, of which difference was not explained by ribulose-1,5-bisphoshate carboxylase/oxygenase (RuBPCO) content. RD was explained by Psat and/or Nc, however, two models must be applied according to plant species. RD related linearly with PsBt and Nc in maize, field bean, and potato.
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