早籼稻空间诱变新品种“浙101”的选育

早籼“浙9248”经卫星搭载诱变处理,SP2在株高、生育期、穗长、每穗粒数、千粒重、结实率、抗病性等性状上出现了较大的分离,经病区多代筛选培育获得早籼突变体“浙101”,在熟期、抗病性和产量等性状上比原亲本有明显改良。2003-2004年浙江省两年区试平均每公顷产量7189.5 kg,比对照“嘉育293”增产3.7%,表现株型适中,穗、粒、重兼顾,茎秆粗壮,抗倒性强,抗稻瘟病等特点。2002-2004年经浙江省多点稻瘟病和白叶枯病联合鉴定,平均叶瘟0.8级,穗瘟1.5级,穗瘟损失率2.6%;白叶枯病4级,抗病性比原亲本和对照有显著提高。2005年10月通过浙江省农作物品种审定委员会审定,是浙江省第1个通过空间诱变技术选育成功的早籼稻新品种,适宜在浙江省及长江中下游稻区作早籼稻种植。该品种的选育成功表明空间诱变同步改良早籼稻多个性状的可能性与有效性,为改良水稻品种的抗性提供了新的途径。

A NEW MUTANT INDICA RICE DISEASES RESISTANCE VARIETY "ZHE101" FOR BY SPACE MUTATION

Air-dried seeds of indica rice variety"Zhe 9248" were carried by recoverable satellite,mutagenic effects of outer space environment of 175～354km on indica rice were studied.Wider segregation spectrum of major characters,such as plant height,growth period duration(GPD),length of panicle,1000-grain weight and so on,were found in the SP_2 generation.A mutant variety "Zhe101" selected from the space mutation progenies was improved significantly in GPD,disease resistance and yield.It was released in Oct.2005 as an early indica rice in the double-cropped Yangtze River area.It has high,stable yield potential under normal fertilization.In Zhejiang Regional Trials in 2003-2004,it yielded 7189.5kg/ha,3.7% higher than the check "Jiayu293".Blast resistance of "Zhe 101" appeared to be obvious superior to the parent and check.The average scale of leaf blast was only 0.8,the neck node blast was 1.5,causes a damage rate is only 2.6% on average.The average scale of bacterial leaf blight disease resistance was 4.0.The successful breeding of "Zhe 101" showed that space mutation is an effective method to simultaneously improve multi-characteristics,and especially in diseases resistance improvement of rice.