Studies on the physiological and ecological characteristics of indica X japonica rice cultivars emphasizing temperature response

Heu, H.

Research Reports of the Office of Rural Development, Crop 20: 1-47

1978


Accession: 000757901

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Abstract
In trials with the indica X japonica rice cv. Tongil and the japonica rice cv. Tongil and the japonica cv. Jinheung, low temp. gave lower germination in Tongil than in Jinheung. Min. germination temp. was 16 deg C for Tongil and 13 deg for Jinheung. Cold tolerance varied with seedling growth stage, and growth of seedlings of Tongil was less at lower day/night temp. and greater at higher temp. than in Jinheung. Min. and opt. ripening temp. for Tongil were 20 and 25 deg , resp., which were 2.5 and 2.7 deg higher than in Jinheung. Cold injury at meiosis was given by 15 deg for 5 days in Tongil and 12.5 deg for 7 days in Jinheung. Opt. temp. for photosynthesis was 2-3 deg higher and translocation at ripening was affected more by temp. in Tongil than in Jinheung. High temp. increased N, P and K uptake and N and P translocation more in Tongil than in Jinheung. Leaf discoloration in Tongil was caused by low temp. or N deficiency and was characterized by a decrease in physiological activities. Discoloration after heading led to a decrease in grain yield. The results were discussed in relation to cultivation techniques.