Indian Society of Genetics & Plant Breeding

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IDENTIFICATION AND CHARACTERIZATION OF TEMPERATURE SENSITIVE GENIC MALE STERILE SOURCES IN RICE (ORYZA SATIVA L.)

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Identification and isolation of the usable sources of temperature sensitive genic male
sterility-fertility system for developing two-line hybrid technology in rice were the
objectives of the study. Among the.&everal male sterile plants isolated from stagger/late
planted germplasm, breedinglinesat differentstagesofdevelopment, and mutagen-treated
populations, six strains namely, SM 3, SM 5, F 61, JP 2, JP 8·1A·12and SA 2 (F 43), remained
sterile at high temperature and turned fertile at low temperature. The six lines were studied
in growth chambers maintained at specific temperature ranges, decided on the basis of
sensitive stage which was determined by a newly developed 'tracking technique' to
identify the critical sterility point (CSP), i.e. the temperature at which a plant is completely
male sterile, and the critical fertility point (CFP), i.e. the temperature at which the plant
turns completely male fertile. The lines were categorized into high CSP-Iow CFP, high
CSP-high CFP, and low CSP-Iow CFP types. Among them, JP· 8-1·A-I2, F-61 and SA 2
(F 43) belonging to the low CSP·low CFP group were found to be the most promising
sources of stablesterility.Transferoftemperature sensitivityfrom them to other productive
agronomic backgrounds and identification of appropriate locations for optimization of
seed production would make the two-line approach a commercial reality.
 

Keywords: Oryza sativa, rice, temperature-sensitive male sterility, hybrid, two-line breeding.

Info

Year: 1995
Volume: 55
Issue: 3
Article DOI: NA
Print ISSN: 0019-5200
Online ISSN: 0975-6906

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