大穗型籼稻三系不育系浙91A的选育

浙91A是以野败籼型不育系V20A为母本,用浙农8010B/浙农91后代中选株系为父本杂交,采用连续单株花粉育性镜检,连续回交转育而成的籼型不育系.其穗型大,每穗粒数达155.6粒;主要稻米品质指标明显优于浙江省主配不育系协青早A;不育株率100%,花粉不育度100%;柱头外露率60.1%,异交结实率55%左右,易于繁殖制种.2003年9月通过了由浙江省科技厅组织的技术鉴定,配制的新组合正进行试验试种.

Breeding of the Large Panicle and Good Quality Indica CMS Line Zhe 91 A

Zhe 91A is a new WA-type indica CMS line developed from crossing V20A with the selected plants from the F_3 lines of Zhenong 8010B/Zhenong 91 and backcrossing successively the complete male sterile plants whose pollen sterility is strictly checked under microscope with their corresponding paternal plants. It has a complete male sterility with 100% of sterile plants and 100% of pollen sterility. It has large panicles (155.6 spikelets/panicle, 54.4 spikelets/panicle more than the check Xieqingzao A). Most of its grain quality characters such as chalky rice, gel consistency and amylose content are better than those of Xieqingzao A, a CMS line most popular in Zhejiang Province. It is easy to conduct hybrid seed production because of its high outcrossing rate (55.7%) with a high stigma exsertion rate (60.1%). Zhe 91A was technically identified in Zhejiang Province in September,2003. Some promising hybrids derived from Zhe 91A are being tested in trials.