Genetic Analysis and Breeding Application of a Novel Rice Mutant with Virescent Yellow Leaves
In breeding practice,leaf color mutation can be used as a marker,utilized in seed production and purity identification. In this paper,a novel rice mutant with virescent yellow leaves mutant was characterized by morphological observation,genetic analysis and breeding utilization,the main agronomic traits of mutant and its wild type was comparized,classical genetic analysis was performed by construction of genetic populations from crosses between mutant with normal green rice materials. A new rice CMS line with leaf color marker was developed by backcross breeding. The mutant mutant was a spontaneous mutant isolated from a hybrid rice maintainer line breeding population,which exhibited the development process of yellow turning green leaf phenotype(from leaf tip to the base) for main culms and tiller leaves. The main agronomic and yielding traits of the mutant were consistent with its wild-type. Genetic analysis indicated that the virescent yellow leaf trait was controlled by a pair of recessive genes. Renong 1A with virescent yellow leaf marker was developed through crossing and successively backcrossing Fengyuan A with mutant,and it had apparent and stable leaf marker trait,aborted completely and good combining ability. This novel rice leaf mutant is a valuable material in basic research and breeding application.