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By D S Brar; B Hardy

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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.

26(3):265-269. Yang RC, Liang K, Wang N, Chen S. 1992. A recessive gene in indica rice 5406S for thermosensitive genic male sterility. Rice Genet. Newsl. 9:56-57. B. P. B. Pant University of Agriculture and Technology, Pantnagar 263145, India. S. S. S. Khush During the 1970s, an indica-japonica hybridization program was launched in India, Indonesia, Malaysia, and some other Asian countries with the help of FAO to get high heterosis. However, only limited progress could be made because of the F1 sterility in indica-japonica crosses.

M. Vijayakumar, M. C. S. Ramesha, Directorate of Rice Research, Rajendranagar, Hyderabad 500 030; and J. Ali, Agricultural College and Research Institute, Thiruchirapalli 620 009, India. References Arunachalam V, Bandyopadhyay A. 1984. A method to make decisions jointly on a number of dependent characters. Indian J. Genet. 44(3):419-424. S. A. A. D. RedoƱa Heterosis in rice has been acknowledged to be associated with the genetic divergence of the parents used in hybridization. We investigated the nature and extent of the correlation between microsatellite marker heterozygosity and heterosis for some quantitative traits in 48 three-line and 13 two-line F1 rice hybrids.

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Advances in rice genetics by D S Brar; B Hardy

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