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Research articles

ScienceAsia 40 (2014): 48-52 |doi: 10.2306/scienceasia1513-1874.2014.40.048

Heterosis and inheritance of fertility-restorer genes in rice

Jakkrit Seesang, Prapa Sripichitt, Tanee Sreewongchai*

ABSTRACT:     Three-line hybrid rice technology can increase rice yield. This study aims to identify restorers and maintainers, to estimate heterosis of hybrid rice, and to identify fertility-restorer genes of F2 populations. The analysis of 31 test crosses revealed 6 restorers and 9 maintainers based on pollen fertility. The estimation of heterosis to select superior genotypes was conducted on 12 hybrids resulting from crosses between 6 restorers and 2 male sterile lines. The results show that two hybrids had a high heterobeltiosis and standard heterosis, with yields of 7940 and 6810 kg/ha, respectively. The inheritance of fertility-restorer genes of F2 populations in crosses IR80151A/CH1 and IR80151A/CH4 was evaluated at heading to flowering stage based on pollen fertility and seed setting rate (SSR). The segregation ratio of pollen fertility was 15:1 (fertile: sterile), representing two nuclear independent dominant genes controlling the trait with sporophytic abortive fertility. The SSR, however, could not be used to study fertility-restorer genes, as it is influenced by physiological and environmental factors.

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Department of Agronomy, Faculty of Agriculture, Kasetsart University, Bangkok 10900 Thailand

* Corresponding author, E-mail: agrtns@ku.ac.th

Received 26 Dec 2012, Accepted 4 Nov 2013