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Characteristics and Variation of Panicle Traits of Korean Rice Varieties in Wet Season of the Philippines  

Park, Hyun-Su (Department of Rice and Winter Cereal Crop, NICS, RDA)
Kim, Ki-Young (Department of Rice and Winter Cereal Crop, NICS, RDA)
Mo, Young-Jun (Department of Rice and Winter Cereal Crop, NICS, RDA)
Choi, In-Bae (Department of Rice and Winter Cereal Crop, NICS, RDA)
Baek, Man-Kee (Department of Rice and Winter Cereal Crop, NICS, RDA)
Ha, Ki-Yong (Department of Rice and Winter Cereal Crop, NICS, RDA)
Ha, Woon-Goo (Rural Development Administration)
Kang, Hyun-Jung (Department of Rice and Winter Cereal Crop, NICS, RDA)
Shin, Mun-Sik (Department of Rice and Winter Cereal Crop, NICS, RDA)
Ko, Jae-Kwon (Department of Rice and Winter Cereal Crop, NICS, RDA)
Publication Information
Korean Journal of Breeding Science / v.43, no.1, 2011 , pp. 68-80 More about this Journal
Abstract
This study was conducted to investigate characteristics and variations of rice panicle traits for breeding temperate japonica varieties adapted to tropical environment. Eleven panicle traits were investigated from nine Korean rice varieties cultivated in Korea and wet season of the Philippines. Tested cultivars were composed of six temperate japonica varieties, three Tongil-type varieties, and one indica variety bred in the Philippines. The number of spikelets on secondary rachis branches (SRBs) was the most variable trait in both environments, while the mean number of spikelets on a primary rachis branch (PRB) was the least variable. Compared with PRB-related traits, SRB traits showed higher correlation with the number of spikelets per panicle. Compared with the plants grown in Korea, the number of spikelets on SRBs, the number of SRBs, spikelets, and rachis branches per panicle were decreased more than other traits in the Philippines. According to path analysis, the number of spikelets on SRBs per panicle affects the number of spikelets per panicle more than the number of spikelets on PRBs per panicle. Climatic factors such as growth duration, cumulative mean temperature, and integrated solar radiation were highly correlated with the relative rate of number of spikelets per panicle. To breed temperate japonica rice varieties adapted to tropical environment, it would be important to select lines which maintain proper growth duration and spikelets on SRBs in target region.
Keywords
Adaptability; Panicle trait; Philippines; Rice; Temperate japonica;
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