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Ethylene biosynthysis of photoperiod-sensitive genic male-sterile rice and fertility alteration

Li Dehong, Luo Bingshan, Qu Yinglan

Huazhong Agricultural University.Wuhan 430070,Hubei

Abstract

The changes of ethylene biosynthysis in young panicles of PGMR (photoperiod-sensitive genic male-sterile rice) cv. Nongken58S (NK58S)and its normal parent line cv. Nongken58 (NK58B) and the relationship between ethylene biosynthysis and fertility expression of PGMR under different photoperiod-temperature conditions were studied. The results showed that ethylene biosynthysis in yound panicles of NK58S was regulated jointly by photoperiod and temperature, but it was not influenced significantly by photoperiod in those of NK58B. The changes in rate of ethylene biosynthysis in the yound panicles of NK58S coincided very well with the model of photoperiod - temperature - reaction - induced PGMR fertility alteration. A significant negative correlation was found between ethylene release rate (ERR) of yound panicles of NK58S and the corresponding pollen fertility. When plants were treated with AVG (aminoethoxy vinylglycine) to retard ethylene biosynthesis, the sterility of NK58S (LD) was obviously reversed; while in the plants treated with ACC (1-amino-cyclopanel-carboxylic acid) to stimulate ethylene biosynthesis, the fertility level of NK58S (SD) decreased sharply. It is concluded that ethylene biosynthesis is closty correlated with the fertility expression of PGMR, and ethylene plays a major role in the regulation of fertility alteration of NK58S.

Key words: PGMR(photoperiod-sensitive genic malesterile rice);Fertility alteration;Ethylene;ACC (1-amino- cyclopane-1-carboxylic acid);AVG(aminoethoxy vinylgly-cine)

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Citing This Article：

Li Dehong, Luo Bingshan, Qu Yinglan. Ethylene biosynthysis of photoperiod-sensitive genic male-sterile rice and fertility alteration. Acta Physiol Sin 1996; 48 (3): (in Chinese with English abstract).