Thermo-sensitivity and Photoperiod Sensitivity Genes Controlling Heading Time and Flower Bud Initiation in Sorghum, Sorghum bicolor Moench

JARQ : Japan Agricultural Research Quarterly
ISSN 00213551
書誌レコードID(総合目録DB) AA0068709X
45-01-01.pdf98.59 KB

The timing of heading and flower bud initiation is critical for reproductive success. In sorghum (Sorghum bicolor Moench), which is a facultative short-day plant, we propose that the thermo-sensitivity and photoperiod sensitivity genes account for the relationship between heading time and the environment. In experiments in fields and growth cabinets, the heading time of cultivars such as cv.Hiromidori accelerated with reduction in total leaf number by exposure to temperatures lower than 20°C (i.e., the opposite phenomenon occurs at over 20°C); these cultivars were designated as B-type cultivars. The flower bud initiation of cultivars such as cv.Tentaka was induced by critical daylength below 12.25 hours; these cultivars were designated as C-type cultivars. In the inheritance study using populations derived from hybrids of B-type cultivars, thermo-sensitivity for heading response was controlled by a monogenic dominant gene (T) of late over early heading. The existence of two photoperiod sensitivity genes, D1 and D2, which show complementary dominant effects, was found in populations derived from hybrids of C type cultivars, and the heading response of C type cultivars was expressed by the interaction both of a dominant thermo-sensitive gene (T) and complementary dominant photoperiod sensitivity genes (D1, D2). AFLP and RFLP analysis suggested that T was located at a genetic distance of 4.0 cM from the AFLP16 marker locus on chromosome 6.



complementary gene effect


heading response


公開者 Japan International Research Center for Agricultural Sciences
国立情報学研究所メタデータ主題語彙集(資源タイプ) Journal Article
開始ページ 1
終了ページ 7
DOI 10.6090/jarq.45.1
権利 Japan International Research Center for Agricultural Sciences
言語 eng