关键词: 水稻, 长穗颈(eui)；遗传分析

Abstract:

Five mutants “eR-1~eR-5” with elongated uppermost internode (eui) derived from indica rice “93-11” induced by Cobalt-60 gamma rays. Compared to those of wild type “93-11”, plant heights and uppermost and second uppermost internodes of mutants were significantly increased and elongated, panicle lengths of mutants were significantly longer, the tillering ability were improved in mutants “eR-4” and “eR-5”, and no significant differences in number of grains per panicle and seed setting rate, 1000-grain weights and yield per plant were reduced to different extents in mutants, especially significant decreases in yield per plant in mutant “eR-1” and “eR-2”. Allelic test indicated that the eui genes of mutants “eR-1, 2, 4, 5” were allelic to each other and the previously reported eui, but non-allelic to the eui gene of mutant “eR-3”, suggesting it is a new mutation. Genetic analysis for new eui mutant “eR-3” showed that the elongated uppermost internode (eui) trait was controlled by one recessive nucleic gene.