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Response of stigma receptivity in CMS and male fertile line of Indian mustard (B. juncea) under variable thermal conditions.
International Journal of Biometeorology 2019 January 3
Field experiments were conducted for 2 years to examine the response of stigma in two different pollination systems, viz., CMS line (MJA5) and open-pollinated variety (Pusa Bold) of Indian mustard (Brassica juncea), to varying weather conditions created by different sowing dates. The CMS line MJA5 (female) with its male line in 8:2 (A:R) row ratio, and Pusa Bold in an isolated field were sown on 21st of October, 30th of October, and 18th of November in 2 consecutive years in North Indian condition. Temporal differences in sowing provided differed weather conditions during flowering, which resulted in variations in the duration to attain the peak flowering stage. Stigma was receptive for longer duration (8 days from the day of anthesis) in CMS line which needs an external pollen source for fertilization to happen, whereas it was only 4 days in open-pollinated variety, assessed in terms of siliqua set and number of seeds/siliqua. Substantial effect of sowing date on stigma receptivity was observed; it was longer in plants sown during October in comparison to those of November in both years. The energy requirement parameters, viz., growing degree days and photo-thermal unit, confirmed that plants sown later failed to accumulate sufficient energy for satisfactory phenological growth and for good seed development.
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