Linkage analysis of earliness gene Efr(t) derived from a line of Oryza rufipogon
2005
Motomura, K.(Ryukyu Univ., Nishihara, Okinawa (Japan). Coll. of Agriculture) | Shimoji, I. | Moromizato, Z. | Nakamura, I. | Ishimine, Y. | Murayama, S.
Heading time of rice is one of the important traits for agronomy because it determines the regional and seasonal adaptation of cultivars. In an isogenic line of Taichung 65, RT61C, which carries a male sterile cytoplasm (msc1) and restorer gene-(Rf1(1)) located on chromosome 10, heading time occurred about 14 days earlier than in Taichung 65. Based on the process of development of the line, it was considered that an earliness gene was strongly linked to Rf1(1). Moreover, the effect of the earliness gene on trait expression was studied. The dominant earliness gene was linked to Rf1(1) with a 16.9% recombination value. Another earliness gene, Efl was identified on chromosome 10, and the gene was linked to Rfll with a 15.7% recombinant value (indirectiy calculated value). Thus, it was assumed that the two earliness genes may be anelic. However, Efl differed from the earliness gene in the present experiment in the degree of acceleration of heading time and degree of dominant expression. Therefore, the earliness gene in the present experiment was considered to be a new gene and was tentatively designated as Ef,(t). Leaf length, leaf sheath length and panicle number was not different between Taichung 65 and RT61C. On the other hand, the spikelet number per panicle was significantly different between them. These differences may be caused by the Ef, (t) gene.
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