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Classification of environmentally induced genetic male sterile lines of rice based on their fertility responses to photoperiod and temperature

Published online by Cambridge University Press:  27 March 2009

S. H. Cheng ,
H. M. Si ,
L. S. Zhuo  and
Z. X. Sun
S. H. Cheng
Affiliation:
Key Laboratory for Rice Biology, Ministry of Agriculture, PR China, China National Rice Research Institute, Hangzhou 310006, PR China
H. M. Si
Affiliation:
Key Laboratory for Rice Biology, Ministry of Agriculture, PR China, China National Rice Research Institute, Hangzhou 310006, PR China
L. S. Zhuo
Affiliation:
Key Laboratory for Rice Biology, Ministry of Agriculture, PR China, China National Rice Research Institute, Hangzhou 310006, PR China
Z. X. Sun
Affiliation:
Key Laboratory for Rice Biology, Ministry of Agriculture, PR China, China National Rice Research Institute, Hangzhou 310006, PR China
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Summary

The use of environmentally induced genetic male sterile (EGMS) rice could alter the development of hybrid rice from a three-line system to a two-line system. It is critical for the utilization of EGMS rice to determine which are the main environmental factors influencing fertility changes. Fertility responses to photoperiod (P) and temperature (T) were studied in 101 EGMS rice lines under nine controlled regimes combining three photoperiods (15·0, 14·0 and 12·5 h)x three temperatures (30·1, 24·1 and 23·1 °C). According to the variance analysis of seed-setting data, 96% of the total EGMS lines studied could be divided into three types as follows: (1) photoperiod-sensitive genetic male sterility (PGMS) characterized statistically by significant (P < 0·05) P and P × T interaction effects but by a non-significant T effect on fertility, (2) thermosensitive genetic male sterility (TGMS) by a significant T effect, a non-significant P effect and by either a significant or a non-significant P × T interaction effect on fertility, and (3) photo-thermosensitive genetic male sterility (P-TGMS) by only a significant P × T interaction effect on fertility. Among the japonica EGMS lines studied, PGMS, TGMS and P-TGMS accounted for 32·3, 9·7 and 51·6%, respectively. However, among the indica EGMS lines, no PGMS lines were detected and most of them were TGMS or P-TGMS (61·4 and 35·7%, respectively). The results indicate that the selection of indica PGMS lines of rice might be very difficult. The availability of different types of EGMS rice in two-line system hybrid rice is evaluated and the selection of an ideal model of response to photoperiod and temperature for indica EGMS is discussed.

Type
Crops and Soils
Information
The Journal of Agricultural Science , Volume 127 , Issue 2 , September 1996 , pp. 161 - 167
Copyright
Copyright © Cambridge University Press 1996

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