Changes of photosynthetic characteristics in relation to leaf senescence in two maize hybrids with different senescent appearance

被引：40

作者：

He, P

Osaki, M ^{[1
]}

Takebe, M

Shinano, T

机构：

[1] Chinese Acad Agr Sci, Soil & Fertilizer Inst, Beijing 100081, Peoples R China

[2] Natl Agr Res Ctr Hokkaido Reg, Sapporo, Hokkaido 0628555, Japan

[3] Hokkaido Univ, Grad Sch Agr, Sapporo, Hokkaido 0608589, Japan

[4] Hokkaido Univ, Creat Res Inst Sousei, Sapporo, Hokkaido 0608589, Japan

来源：

PHOTOSYNTHETICA | 2002年 / 40卷 / 04期

关键词：

chlorophyll content; nitrogen content; phosphoenolpyruvate carboxylase; photon-saturated photosynthetic rate; ribulose-1,5-bisphosphate carboxylase/oxygenase;

D O I：

10.1023/A:1024347918199

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

A field experiment was conducted to investigate the changes in chlorophyll (Chl) and nitrogen (N) contents, ribulose1,5-bisphosphate carboxylase/oxygenase (RuBPCO) and phosphoenolpyruvate carboxylase (PEPC) contents and PEPC activity, and the photon-saturated net photosynthetic rate (P-Nsat), 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 P-Nsat 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.

引用

页码：547 / 552

页数：6

共 39 条

[1] Relationships between nitrogen content and net gas exchange components of a cotton leaf during ontogeny [J].