不同不育系所配杂交水稻组合在单、双株寄栽条件下的秧苗素质分析

THE QUALITY EVALUATION OF HYBRID RICE SEEDINGS FROM DIFFERENT MSL BREEDING COMBINATION UNDER SINGLE AND DOUBLE PLANTS DEPOSIT-TRANSPLANTING CONDITION

通过对不同不育系所配杂交水稻组合在单、双株寄裁条件下的秧苗素质研究，结果表明：Ⅱ-32A所配组合的总根数、白根数、白根率和分蘖性能等指标均较优，特别是白根率高，根系活力和分案能力强，但繁茂性稍差。冈46A所配组合其突出特点是叶面积和苗高占优势，繁茂性好，秧田各时期的于物质积累能力较强，但根系活力稍差，白根率较低。二汕A所配组合的特点是在发根力和根系活力上稍占优势，白报率较高。D汕A所配组合无突出特点。寄款方式对秧苗素质影响很大，主要表现在前期和后期的差异大。前期双株秧稍占优势，但在后期刊单株放的优势很明显。因此，在土壤肥沃，水源充足的地方，为培育壮秧，增加秧龄弹性，应提倡单株寄栽。

篢he results showed that,the amounts of total roots,and of white roots,the rate of white roots and tillering ability,of the parentages by Ⅱ -32A breeding were higher. However, their vegetative growth weaker. The main traits of the parentages by Gang 46 A breeding were that they had higher leaf area and seedling height and thus had strong vegetative growth and dry material accumulating ability in various periods in seedling bed. But, the roots vitality and the rate of white roots were lower. The main traits of the patentages by Ershuan A breeding were that the roots vitality and the rate of white roots were higher. The parentages by D shuan A breeding was ordinary.The ways of deposit-transplanting had great influence on the seedling quality,it mainly showed that earlier stage and later stage had a great difference. The twin plant deposit-transplanting had more superiority in earlier stage. The single plant deposit - transplanting had more superiority in later stage. Therefore, we should spread the single plant deposit - transplanting for cultivating strong seedling and increasing the elasticity of seedling-age in the area of good condition.