Evaluation of sterility expression of thermosensitive genic male sterile (TGMS) rice (Oryza sativa L.) lines
2018
Lopez, P.I.M. | Dela Rosa, A.M. | Solis, R.O. | Hernandez, J.E.
Use of TGMS can be a commercially viable approach for two line-hybrid rice seed production because of its simplicity in terms of parental seed multiplication and broader choice of parents for hybrid development. The stability of sterility of TGMS lines in the target environment is an important parameter that must be established to ensure the production of pure hybrid seeds. Evaluation of TGMS lines is important in identifying stable lines that minimize the risk of producing impure hybrids due to fluctuations in temperature at critical periods. In this study, three TGMS lines planted at different sowing dates were evaluated for sterility expressions during 2016 wet season, in Calauan, Laguna [Philippines]. Sowing was conducted weekly from first week of May to last week of July in order to observe stability of the sterility expression. Pollen sterility for TG1 and TG3 remained within the range of sterile to completely sterile whereas TG2 ranged from partially sterile to completely sterile across different sowing windows. On the other hand, spikelet sterility ranged from 98% to 100%. TG1 remained completely sterile across sowing windows compared to the other 2 lines. In addition to this, the basic agronomic traits such as number of days to flowering, plant height and number of productive tillers were gathered. The days to flowering for TG1 is 91 days with the mean height of 90.7 cm. TG1 showing both good sterility expression and agronomic traits, is an ideal female parent to use both for parental line development and F1 seed production in Calauan, Laguna from May to July sowing windows. Further evaluation of their sterility as well as fertility restoration under wider range of environments and broader sowing windows is recommended.
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