Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.).

Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Research Abstract Details 

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Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Abstract Text:

A rice pse(t) (premature senescence, tentatively) mutant line, was isolated from 4,500 independent T-DNA inserted transgenic lines. The symptoms of premature senescence appeared more severely than those of the control plants (Zhonghua 11, japonica) at the last development stage. To characterize the mutant and provide basic information on the candidate genes by mapping to a physical region of 220-kb, experiments were carried out in two phytotrons under controlled temperature of 24 degrees C and 28 degrees C, respectively. The content of chlorophyll, soluble protein and MDA (malondialdehyde), net photosynthesis, the antioxidant enzyme activities of SOD (superoxide dismuase) (EC 1.15.1.1) and POD (peroxidase) (EC 1.11.1.7) and the peptidase activities of leaves were measured from top to bottom according to the leaf positions at the flowering stage. Compared with the control plant, the mutant showed the following characteristics: (1) Higher net photosynthesis rate (P(n)) appeared in the 1st and 2nd leaves, contents of chlorophyll and soluble protein were also higher in the 1st leaf; (2) The activities of SOD, POD and peptidase were higher according to the leaf position from top to bottom; (3) The symptom of premature senescence was accelerated in the mutant at 28 degrees C treatment. The MDA content and the SOD and POD activities between the 24 degrees C and 28 degrees C treatment mutants were not significantly different. Content of chlorophyll and soluble protein of leaves mutant decreased rapidly at 28 degrees C treatment. The results show that pse(t) is sensitive to high temperature. The probable function of PSE(T) is discussed.

Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Publishing Authors By Initials

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Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Journal of Zhejiang University. Science. B

VOLUME: 6

Page Numbers: 803-11

Journal Abbreviation:

ISSN: 1673-1581

DAY: 25

MONTH: Aug

YEAR: 2005

Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Information

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LANGUAGE: eng

NlmUniqueID: 101236535

Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Keywords Mesh Terms:

KEYWORDS: Plant Proteins

MESH TERMS: metabolism

Chemical & Substance for Abstract: Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.). Information

Substance Name: Plant Proteins

Registry Number: 0

Grant and Affiliation Information for Isolation and physiological characteristics of a premature senescence mutant in rice (Oryza sativa L.).

AFFILIATION: State Key Laboratory of Plant Physiology and Biochemistry, School of Life Sciences, Zhejiang University, Hangzhou 310029, China.

Country: China

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MEDLINETA: J Zhejiang Univ Sci B

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