Seed Development and Maturation on Seed Quality of Upland Rice cv. Dawk Pa-yawm



Poor seed quality is a major problem of upland rice production in southern Thailand. The production of maximum quality seed should be harvested at physiological maturity. The objectives of this paper were to study the changes of morphological and physiological traits during seed development and maturation and to relate the color appearance to the physiological maturation of the upland rice cv. Dawk Pa-yawm. The experiment was conducted at the Department of Plant Science, Faculty of Natural Resources, Prince of Songkla University, Hat Yai campus, Hat Yai, Songkhla, Thailand from August 2014 to January 2015. Upland rice was planted in a field and the panicles were tagged to indicate the date of flowering. The panicles at 8, 12, 16, 20, 24, 28, 32, and 36 days after flowering were harvested to investigate seed quality. The results showed that upland rice seed reached physiological maturity at 28 days after flowering with a maximum dry weight, germination and vigor in terms of soil emergence, mean emergence time, seedling growth rate and the low electrical conductivity. The physiological maturity occurred when approximately 85 % of seeds in the panicle turned yellow. This characteristic can be used for physiological maturity to determine the optimum harvesting time of upland rice seed cv. Dawk Pa-yawm.


Upland rice, seed quality, seed development, seed maturation, physiological maturity

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