杂交中稻品种间着粒数与再生力关系

RELATIONSHIP BETWEEN GRAIN NUMBER PER PANICLE OF MAIN CROP AMONG VARIETIES AND THEIR RATOONING ABILITY IN HYBRID MID-RICE

１９９５～１９９６年以１９个籼型杂交中稻品种为材料，研究了品种间头季稻着粒数与再生力关系。结果表明，头季稻品种间着粒数与其再生力呈极显著负相关；其机理在于：头季稻品种间着粒数与粒叶比呈极显著正相关，即头季稻着粒数少，单位颖花绿叶面积占有量大，可减少茎鞘中先期贮藏的光合产物向穗部的输入量，使头季稻收割时母茎鞘有较多剩余光合产物，为再生芽生长提供重要的营养物质。

From 1995 to 1996, the relationship between the number of grains per panicle among varieties of main crop and their ratooning ability in hybrid mid rice with 19 varieties of rice as materials was studied. The results are the followings: Highly significant negative correlations between the number of grains per panicle of main crop among varieties and their ratooning ability were observed; The mechanism is that there are highly significant positive correlations between the number of grains per panicle of main crop among varieties and their ratio grain to leaf. In other words, the fewer the grain number per panicle of main crop, the more green leaves area for per grain filling. So it is decline that the amount of photosynthetic matter is transported from stems to grains and there is still more photosynthetic matter remained in the basic stems at harvesting date of main crop for ratooning buds growing.