Ontogenetic Changes of Photosynthetic and Dark Respiration Rates in Relation to Nitrogen Content in Individual Leaves of Field Crops |
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Authors: | Osaki M Shinano T Kaneda T Yamada S Nakamura T |
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Institution: | (1) Graduate School of Agriculture, Hokkaido University, Kita-9, Nishi-9, Kitaku, Sapporo, 060-8589, Japan |
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Abstract: | Ontogenetic changes of rates of photon-saturated photosynthesis (P
sat) and dark respiration (R
D) of individual leaves were examined in relation to nitrogen content (Nc) in rice, winter wheat, maize, soybean, field bean, tomato, potato, and beet. P
sat was positively correlated with Nc as follows: P
sat = CfNc + P
sat0, where Cf and P
sat0 are coefficients. The value of Cf was high in maize, medium 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. R
D was explained by P
sat and/or Nc, however, two models must be applied according to plant species. R
D related linearly with P
sat and Nc in maize, field bean, and potato as follows: R
D = a P
sat + b, or R
D = aNc + b, where a, a, b and b are coefficients. In other species, the R
D/P
sat ratio increased exponentially with the decrease of Nc as follows: R
D/P
sat = a exp(b Nc), where a and b are coefficients. Therefore, R
D in these crops was expressed as follows: In(R
D) = ln(a P
sat) + b Nc, indicating that R
D in these crops was regulated by both P
sat and Nc. |
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Keywords: | carbon-nitrogen interaction growth respiration leaf mass per area maintenance respiration |
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