中二软占空间诱变品系的主要农艺性状及稻瘟病抗性

对经抗性初筛的34个中二软占空间诱变4代（SP4）品系进行主要农艺性状分析及稻瘟病抗性评价，结果表明，诱变品系在株高、有效穗数、穗长、穗粒数等性状的变异都达到了极显著水平，其中变幅最大的是千粒重，其次是结实率，有效穗数的变异幅度最小。除Z34外，其余33个诱变品系的抗谱比原种均有明显拓宽，且田间均抗穗瘟，说明低世代进行抗性初筛是有效的。结合主要农艺性状考查和抗瘟性分析，可从这些诱变品系中选择既抗病又具备较好农艺性状的优良材料，实现抗病种质创新的目的。

MAIN AGRONOMIC TRAITS AND RESISTANCE TO RICE BLAST OF SPACE-INDUCED MUTANT LINES OF ZHONG-ER-RUAN-ZHAN

The main agronomic traits and resistance to rice blast of 34 space-induced lines from an elite rice cultivar,Zhong-er-ruan-zhan were evaluated at their SP4.The resistance to blast of the mutant lines had been tested by two blast isolates previously.It was found that the mutant lines showed significant difference in plant height,effective panicles,panicle length and grains per panicle etc.from their parent.The range of variation in 1000-grain weight was the largest,followed by the seed-setting rate,and that of effective panicles was the least among all the traits thesied.Except for the line Z34,33 mutant lines had broader resistance spectra than the wild-type based on the test with 38 different blast isolates,and all the 33 lines were also resistant to the panicle blast in the field.The result confirmed that selection for resistance to blast in lower generations was reliable.Taking account of agronomic traits and blast resistance,promising lines with resistance to blast and good agronomic characters could be selected from those mutant lines.Therefore,the elite rice germplasm with enhanced disease resistance can be produced.