Ammonium accumulation is associated with senescence of rice leaves |
| |
Authors: | Shu Jiuan Chen Kuo Tung Hung Ching Huei Kao |
| |
Affiliation: | (1) Department of Agronomy, National Taiwan University, Taipei, Taiwan, Repulic of China |
| |
Abstract: | The relationship between ammonium accumulation and senescence of detached rice leaves was investigated. Ammonium accumulation in detached rice leaves coincided closely with dark-induced senescence. Exogenous NH4Cl and methionine sulfoximine, which caused an accumulation of ammonium in detached rice leaves, promoted senescence. Treatments such as light and benzyladenine, which retarded senescence, decreased ammonium level in detached rice leaves. Abscisic acid, which promoted senescence, increased ammonium level in detached rice leaves. The current results suggest that ammonium accumulation may be involved in regulating senescence. Evidence was presented to show that ammonium accumulated in detached rice leaves increases tissue sensitivity to ethylene. The accumulation of ammonium in detached rice leaves during dark-induced senescence is attributed to a decrease in glutamine synthetase activity and an increase in reduction of nitrate. |
| |
Keywords: | abscisic acid ammonium benzyladenine leaf senescence methionine sulfoximine Oryza sativa |
本文献已被 SpringerLink 等数据库收录! |
|