水稻空间诱变突变品系主要农艺经济性状及稻瘟病抗性变异

Variation of major agronomic characters and resistance to blast of mutant lines by space mutation in Oryza sativa

对籼稻品种特籼占13经返回式卫星搭载空间诱变的21个高代(SP10)突变品系的主要农艺经济性状以及稻瘟病抗性表现进行考察.结果表明:参试的各突变品系大部分主要农艺经济性状均表现明显的变异,既有正向也有负向变异;不同突变品系对稻瘟病的抗性表现差异很大,同一突变品系对不同致病菌株的抗性表现差异也较大,表明空间诱变对稻瘟病抗性变异作用明显但较为复杂.从参试突变品系中可选出在株高、熟期、产量、外观品质和抗性等性状同时得到明显改良的新品种和新种质.

The major agronomic characters and resistance to blast of 21 space mutant lines (SP10), which were selected from the recoverable satellite carried indica rice variety Texianzhan 13, were observed and studied. The results showed that significant variations (including forward-and backward mutation) were found in most major agronomic and economic characters in these mutant lines. The positive and negative variations were found in a single character. Different mutant lines showed the different resistance spectrum to blast and the same line had the different blast resistance to different Magnaporthe grisea pathogenic strains. These results indicated that the resistance variation caused by space mutation were complicated. The new varieties and germplasm which had significant improvement in many characters such as plant height, maturing duration, yield, quality and blast resistance could be obtained from the space mutant lines.