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Lecture Introduction

Lecture Introduction

Session 2: Molecular breeding research on heterosis of indica-japonica cross of rice——Prof. Jianming Wan

/ 2015-02-06

Time: February 6, 2015

Venue: Room 454, Wang Kezhen Building, Peking University

With rising demand for both the quantity and quality of rice in China, it has been noted that the ultilization of heterosis of indica-japonica cross of rice promises greater potential than other hybrid rice varieties in terms of yield and quality; yet three technical challenges need to be addressed: sterility of indica-japonica cross, over-parent late maturity in growth time and excessive plant height. In recent years, based on the research on functional genomics of rice, molecular design and directive breeding have been preliminarily made possible by clarifying the genotypes of heading time of species in various rice-producing zones in China and analyzing ecological conditions of light intensity and temperature in different regions. By utilizing heading time genes, the growth time problem of hybrid has been solved; by exploring for new dominant semi-dwarf genes, the height of hybrid is effectively controlled within 100-120cm;through mining for larger numbers of hybrid sterility genes, finding out corresponding wide compatibility gene locus for pyramiding and enabling site-directed mutual substitution of indica-japonica segments with molecular markers, a new variety of light- and temperature-sensitive sterile rice japonica has been bred, hence providing a feasible approach for utilizing the advantage of heterosis of indica-japonica cross of rice.