Physiological characteristics of nitrogen nutrition and stress-resistance of film-mulched rice in various ecological regions of Zhejiang Province

Abstract

Abstract: The study showed that different ecological environment and cultivation system in various ecological regions of Zhejiang Province resulted in some different physiological characteristics of nitrogen nutrition and stress-resistance,especially in the aspect of NO₃^--N and NH₄⁺-N concentrations,between film-mulched and conventional flooded rice.Owing to the heat stress in Hangjiahu plain,the NO₃^--N concentration of film-mulched rice decreased to some extent,but NH₄⁺-N concentration increased markedly at tillering,jointing and booting stages,compared to conventional flooded rice.In Jinqu basin,the NO₃^--N concentration of film-mulched rice at booting stage was higher,while the NH₄⁺-N concentration in its roots was notably lower than those of conventional flooded rice,with NH₄⁺-N concentration in its basal stems and leaves somewhat increased.Generally,the glutamine synthetase(GS) and nitrate reductase (NR) activities in film-mulched rice leaves were enhanced at booting stage,while malondiadehyde (MDA),soluble sugar (SS) and proline(Pro) concentrations had little changes.In conclusion,film-mulched cultivation was beneficial to the rice growth and its high yielding.

Key words: Film-mulched cultivation, Nitrogen nutrition physiology, Stress-resistance physiology, Rice

CLC Number:

LU Xinghua, WU Lianghuan, ZHENG Zhaisheng, KONG Xiangjun, ZHANG Fusuo . Physiological characteristics of nitrogen nutrition and stress-resistance of film-mulched rice in various ecological regions of Zhejiang Province[J]. Chinese Journal of Applied Ecology, 2005, 16(2): 273-278.

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