北方粳稻叶型特征及最优叶型模式的探索

Study on Leaf Characters and Superior Leaf Characters Pattern of Northern Japonica Rice

以北方杂交粳稻所衍生的两个重组自交系群体（RILs）为试验材料，对其叶型性状进行了分析，探究北方粳稻叶型特征及最优叶型模式。结果表明，两群体高产和超高产类型总体的叶型为上部叶片直立，下部叶片披散，剑叶的角度略大于下部叶片的角度。超高产类型的倒二叶基角一般为13～14°，张角在13～16°之间，而倒三叶的基角为17°左右，张角20°左右，倒四叶的叶角变化较大。

Two recombinant inbred lines （RILs） derived from northern crossbreeding japonica rice were stud- ied on leaf characters and superior leaf characters pattern. The results indicated that leaf characters of high-yield and super-high-yield were upper erect and lower flat, angle of flat leaf was little bigger than lower leaf by using cluster analysis. In the supper-high-yield varieties,the basic angle of top second leaf was about 13-14°, the stretch angle of top second leaf was 13 -16°,while the basic angle of top third leaf was roughly 17°and stretch angle of top third angle controlled about 20°, top fourth leaf angle change was bigger.