Characteristics of Panicle Traits for 178 Rice Varieties Bred in Korea
2010
Park, H.S., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, K.Y., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Mo, Y.J., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Choung, J.I., National Institute of Crop Science, RDA, Suwon, Republic of Korea | Kang, H.J., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, B.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Shin, M.S., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Ko, J.K., National Institute of Crop Science, RDA, Iksan, Republic of Korea | Kim, S.H., University of Seoul, Seoul, Republic of Korea | Lee, B.Y., University of Seoul, Seoul, Republic of Korea
This study was conducted to investigate characteristics of panicle traits which are important factors affecting yield and grain quality of rice. Twelve panicle traits in 178 Korean rice varieties composed of 160 Japonica type varieties and 18 Tongil type varieties were investigated. Tongil type varieties had longer panicle and thicker neck node than Japonica type varieties. Other traits such as number of total spikelets, total rachis-branches, secondary rachis-branches (SRBs) per panicle, total spikelets on SRBs per panicle, mean number of spikelets on a SRB, and mean number of SRBs per primary rachis branch (PRB) in Tongil type varieties were also higher than in Japonica type varieties. On the other hand, Japonica type varieties were shown to have well exserted panicle and little more mean number of spikelets on a PRB than Tongil type varieties. According to cluster analysis based on 12 panicle traits, 178 varieties were divided into four main groups. Group Ⅰ had 133 Japonica type varieties and was characterized by relatively well exserted short panicle, small thickness of neck node, few rachis-branches and little sink size than other group. Group Ⅱ was composed of 24 Japonica type varieties and 6 Tongil type varieties showing medium value and range between Group Ⅰ and Ⅲ. Group Ⅲ included 11 Tongil type varieties and 1 Japonica type variety 'Baegjinju1' characterized by relatively poor exserted long panicle, big thickness of neck node, many rachis-branches and large sink size. Group Ⅳ was solely composed of 'Nongan', which had well exserted long panicle, big thickness of neck node, many rachis-branches and large-sink size. In correlation analysis, number of total spikelets per panicle showed very high correlation with the number of total rachis-branches per panicle (r=0.975), number of spikelets on SRBs per panicle (0.962), number of SRBs per panicle (0.959), mean number of SRBs per PRB (0.746) and mean number of spikelets on SRBs (0.738).
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