Genetic analysis of the rice [Oryza sativa] cultivar kasalath with special reference to two photoperiod sensitivity loci, E1 and Se-1
1998
Ichitani, K. (Kyoto Univ. (Japan)) | Okumoto, Y. | Tanisaka, T.
The indica rice cultivar Kasalath (KA) has been extensively used as a model cultivar in the molecular genetics of rice in Japan. To advance our knowledge of the molecular genetics of heading time in rice, we performed a genetic analysis of Ka with special reference to two major photoperiod sensitivity loci, E1 and Se-1. We also discussed the relationships of these two loci with the five QTLs (Hd-1 - Hd-5) that Yano et al. (1995) identified using the progenies from the cross "KA x the Japanese japonica cultivar Nipponbare". The F1 and F2 generations from the crosses "11 heading time tester lines x KA" were subjected to genetic analyses. The Rc (brown pericarp and seed coat) and Pgi-2 (phosphoglucose isomerase-2) loci were used as linkage markers of the E1 and Se-1 loci, respectively. Experimental results showed that KA carries a new photoperiod sensitivity allele E1 k(t) and a photoperiod insensitivity allele Se-1e. The E1 k(t) proved to stimulate the photoperiod sensitivity of rice more than a strong photoperiod sensitivity allele E1. Based on the findings of the present study and previous works, we concluded that the E1 and Se-1 loci were identical with the Hd-4 and Hd-1 loci, respectively
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