Genetic analysis of temperature-sensitive genic male sterility in rice
2003
Ali, A.J. | Mohammed, S.E.N. | Rajagopalan, R. | Vijayakumar, C.H.M.
Crosses were made between two TGMS lines, ID24 x SM5 and IC10 x JPs4. The F1s had completely normal pollen and spikelet fertility under high temperature (35°C day/26°C night). The F2s showed a 9 fertile:7 sterile ratio, indicating that the character is governed by two separate genes. Pollen sterility in the F2 ranged from completely sterile to 27% sterility, indicating the effect of modifier genes under high-temperature regimes (during April 1998 at Tiruchirapalli, India). Testcrosses made between TGMS and non-TGMS lines were used to determine the F2 segregation pattern under higher temperature. The eight most promising F1s based on their yield performance were selected and F2 segregation under high temperature was carried out for pollen fertility. The F2 segregated into a 3 fertile:1 sterile (TGMS) ratio under high temperature (greater than 35.5°C day and greater than 25.6°C night), indicating that the TGMS trait is governed by a single gene.
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