诱发籼稻早熟同型系的研究 Ⅲ.早熟同型系的发生与不同系谱亲缘的关系

辐射诱发早熟同型系的发生率与水稻品种亲缘有密切关系。同一亲缘或组合衍生的品种早熟同型系发生率基本相似 ;不同亲缘品种早熟同型系的发生率不一 ,有强、弱和一般 3种类型。一般亲缘差异较大的亲本杂交后代早熟同型系发生率比亲本亲缘差异较小杂交后代高。研究表明 :IR8(Peta×DGWG)、IR1 2 7(Cpslo×Sigadis)以及IR2 4(IR8×IR1 2 7)衍生的品种早熟同型系发生率都较高 ,属于诱发早熟同型系发生的优势系谱

HOMOLOGOUS SERIES OF INDUCED EARLY MUTANTS IN INDICA RICE Ⅲ. The relationship between the induction of homologous series of early mutants and its different pedigree

The percentage of homologous series of early mutants(PHSEM) induced by irradiation was closely related to its pedigree.This study showed that PHSEM for varieties with the same pedigree were similar,and there were three different level of dominance(high,low and normal) in the homologous series induced from different pedigree.The PHSEM for varieties derived form distant|relative|parents were higher than that derived from close|relative|parents.There was the dominance pedigree for the induction of homologous series of early mutants.IR8 (Peta×DGWG), IR127(Cpslo×Sigadis) and IR24(IR8×IR127) were dominant pedigree,and varieties derived from them could be easily induced the homologous series of early mutants.