Development of Xieqingzao eui CMS lines in indica rice

Dried seeds of Xieqingzao maintainer lines (B lines) were treated with γ rays of 60 Co at the dosage of 6 928 C·kg -1 and 9 699 C·kg -1 respectively,three types of recessive tall mutants were obtained from M 2 population,which were named as Xieqingzao eB(1),Xieqingzao eB(2) and Xieqingzao eB(3) respectively.Xieqinzao eA(2) lines were bred from the cross of Xieqinzao eB(2) with Xieqingzao A and backcross with Xieqingzao eB(2) successfully.Compared with Xieqingzao A lines,Xieqingzao eA(2) lines had elongated panicle exsertion(+2 55 cm ) and spikelet length(+0 58 cm ),higher spiketlet length\|width ratio(+0 18) and exserted stigma rate(+3 91percentage),more sensitive to GA 3.