20Jan 2018

STUDIES ON HEADING DATE FOR SYNCHRONIZATION AND HYBRIDIZATION OF FIVE RICE VARIETIES UNDER SHORT DAY LENGTH AND NEUTRAL DAY LENGTH.

  • M.Sc. Student of Laboratory of Tropical Crop Science, Department of International Agricultural Development, Tokyo University of Agriculture, Tokyo, Japan.
  • Department of International Agricultural Development, Tokyo University of Agriculture, Tokyo, Japan.
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Rice is a short day plant and flowering is promoted in short day conditions and suppressed in long day condition. Short-day condition allows the production of plants in different flowering stages which greatly facilitates synchronous flowering for varieties that differ in their flowering time. The heading date for synchronization of Paw San Hmwe (PSM) and other four indica rice varieties were studied under short day length and neutral day length condition and F1 seed set was observed from hybridization of PSM and indica rice varieties by hot water emasculation method. Results showed days to heading of PSM and other four indica varieties in short day length was earlier than those in neutral day length.Among the tested varieties, PSM was highly sensitive to high temperature and photoperiod in neutral day length due to not only flowering in short day photoperiod condition but also photoperiod sensitive and late cultivar. The present study revealed that although five rice varieties were cultivated to adjust synchronization under neutral day length and short day length for hybridization, synchronization for PSM and other four indica rice varieties was not found in both conditions because it might be different genetic variation on the tested varieties and sowing date of tested varieties was same under neutral day length and short day length condition. Synchronization was found in short day length and cultivation in concrete tank of net house. PSM from short day length condition was used as female parent for hybridization because it was synchronized with the other three indica varieties from second time cultivation in concrete tank of net house. The F1 seed set percent of PSM x IR 24 was higher than the other tested crosses and collected two F1 hybrids (PSM x IR 24 and PSM x Thaichung 65). Therefore, short day length condition (9 hour light and 15 hour dark) could be used for synchronization and hybridization on rice genotypes especially PSM (photoperiod sensitive variety) compared to neutral day length condition. The F1 hybrids (PSM x IR 24 and PSM x Thaichung 65) from this study should be used to get new rice varieties through several techniques.

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[ZinWai Maw and Irie Kenji. (2018); STUDIES ON HEADING DATE FOR SYNCHRONIZATION AND HYBRIDIZATION OF FIVE RICE VARIETIES UNDER SHORT DAY LENGTH AND NEUTRAL DAY LENGTH. Int. J. of Adv. Res. 6 (Jan). 906-916] (ISSN 2320-5407). www.journalijar.com

Zin Wai Maw
Tokyo University of Agriculture

DOI:

Article DOI: 10.21474/IJAR01/6300      
DOI URL: https://dx.doi.org/10.21474/IJAR01/6300

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