Photosynthetica 2002, 40(4):547-552 | DOI: 10.1023/A:1024347918199

Changes of Photosynthetic Characteristics in Relation to Leaf Senescence in Two Maize Hybrids with Different Senescent Appearance

Ping He1,2, Mitsuru Osaki3, Masako Takebe2, Takuro Shinano3
1 Soil and Fertilizer Institute, Chinese Academy of Agricultural Sciences, Beijing, China
2 National Agricultural Research Center for Hokkaido Region, Sapporo, Japan
3 Graduate School of Agriculture, Hokkaido University, Sapporo, Japan

A field experiment was conducted to investigate the changes in chlorophyll (Chl) and nitrogen (N) contents, ribulose-1,5-bisphosphate carboxylase/oxygenase (RuBPCO) and phosphoenolpyruvate carboxylase (PEPC) contents and PEPC activity, and the photon-saturated net photosynthetic rate (PNsat), and their relationships with leaf senescence in two maize hybrids with different senescent appearance. One stay-green (cv. P3845) and one earlier senescent (cv. Hokkou 55) hybrid were used in this study, and we found that Chl and N contents and the PNsat in individual leaves of P3845 were greater than those in corresponding leaves of Hokkou 55 at the successive growth stages. In addition, larger contents of RuBPCO and PEPC, and a greater activity of PEPC were observed in P3845. Due to the lower rates of decrease of Chl, RuBPCO, and PEPC amounts per unit of N, and the lower net C translocation rate per unit of N in the stay-green hybrid, leaf senescence was delayed in comparison to the earlier senescent hybrid.

Additional key words: chlorophyll content; nitrogen content; phosphoenolpyruvate carboxylase; photon-saturated photosynthetic rate; ribulose-1,5-bisphosphate carboxylase, oxygenase

Published: December 1, 2002  Show citation

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He, P., Osaki, M., Takebe, M., & Shinano, T. (2002). Changes of Photosynthetic Characteristics in Relation to Leaf Senescence in Two Maize Hybrids with Different Senescent Appearance. Photosynthetica, 40(4), 547-552. doi: 10.1023/A:1024347918199
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