Sterility inducing cytoplasm: its effect on agronomic performance of F sub 1 rice hybrids
2018
Corpuz, M.V. | Agustin, A.M.L. | Gramaje, L.V. | Caguiat, J.D. | Tapec, R.T.
Production of bulk amount of seeds in hybrid seed production for commercial cultivation is not possible without the use of sterility mechanism. However, sterility inducing cytoplasm is reported to have negative effect that could be inherited and affect the performance of F1 hybrids. Three-line hybrid is based on cytoplasmic male sterility (CMS) and fertility restoration system. CMS line is caused by expression of a mitochondrial gene which causes the production of non-viable pollen without affecting other functions of the plant. In this study, field performance of rice hybrids generated from five CMS and maintainer lines crossed to five restorer lines were evaluated in replicated trial. It specifically aimed to (1) compare the performance of A X R and B X R crosses (2) evaluate the extent of sterility-inducing effect to yield components, and (3) identify CMS line with high restorability. Based on the result, performance of some hyrids generated from A x R significantly differ to B x R crosses in most of the yield related traits such as plant height, maturity, percent productive tiller, 1000 grain weight and percent fertility. Among the hybrids, PR20A x PR36246-Hy-1-19-2-2R (11t/ha), PR19A x PR36414R (10.30t/ha), IR79128A x PR36414R (9.85t/ha) were the top yielders. Moreover, PR19A x PR35749-HY recorded the highest percent fertility of 90.64%, while PR19B x PR35749-HY obtained the lowest percent fertility of 56.48%. This indicates that sterility inducing cytoplasm did not affect the performance in terms of yield, and other important yield components such as percent fertility and 1000 grain weight to specific A x R crosses. This can be attributed to the strong restoring ability of the R lines and good restorability of the CMS lines.
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