玉米P群自交系的生物学特征特性评价

与温带骨干系相比,P群自交系苗期叶色、叶鞘特征特性明显,株型缺乏紧凑类型,生育期偏晚,单株产量低,抗性强,子粒百粒重和容重较高。P群自交系的光敏感反应主要表现在与营养生长相关的几个性状上,如株高、穗位和雄穗分枝数等。在生殖生长性状上光敏感反应比较迟钝。在温带玉米区适应性较好。但是一些P群自交系如沈137、齐319、1127等各项指标光周期敏感仍反应强烈。

The Evaluation of Biological Characters of P Maize Germplasm Lines

The specialties of P germplasm lines were: (1)the seedling leaf an d sheath color were distinct from those of Chinese elite temperate lines; (2)the plant type was normally half-compact; (3)the growth days were longer than that of Chinese elite temperate lines; (4)the grain yield was comparatively low; (5)t hey were stronger in biological stress and higher in 100-kernel weight and kerne l bulk weight. Their photoperiod sensitivity was mainly reflected in some traits related with vegetative growth such as plant and ear height, the number of tass el branch, but not in traits related with reproductive growth. They still expres sed strong photoperiod sensitivity in some P group inbreds such as Shen 137, Qi 319 and 1127.