Abstract
To identify new earliness g'enes in rice, 15 isogenic earlyheading lines were bred after ten backcrossings, using 15 reciprocal translocation homozygotes (RT-Iines) produced from several varieties as donor parents of earliness genes, and Taichung 65 (T65) as a recurrent parent. Gene analysis for heading time in F2 plants from the crosses of the early heading lines/T65, and in B1F1 plants from the crosses of the early heading lines/2 * T65 showed that each early heading line carried a dominant earliness gene. An allelism test between earliness genes harboured by these early heading lines and an earliness gene Ef-1 on the tenth chromosome disclosed that each early heading line carried an earliness gene at the Ef-1 Iocus. Out of 15 early heading lines, ten harboured earliness genes derived from ten RT-lines induced from the same cultivar Okute-Asahi.
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