【摘要】 <正> 玉米丝黑穗病(Sphaoelotheca reliana Var.zeae)是春玉米地区的重要病害。七十年代中期以来病害严重发展,给生产造成很大损失。实践证明,贯彻以抗病品种为中心的综合防治措施是防治此病的有效途径。研究品种抗病性与遗传是选育抗病品种的基础。本文报道我们于1976—1982年期间关于上述问题的研究结果。更多还原

【Abstract】 A programme for screening the resistance of corn plants to head smut, （Sphacelotheca reiliana var. Zeae） was tried in 1976-82 on 750 inbred lines, hybrids and local varieties, in which 177（23.6%）showed varying degrees of resistance. A wide range of resistant sources have been selected, such as "Mo 17", "Liao 1311", "Dan 624", "Wugong 107", "Hobai","B 70","Ji 63","7091", "Zhongdan No.2" and "Shaandan No. 9", etc. The resistance is a numerical inheritance, and controlled by dominant nuclear genes, recessive genes or the genic interaction of several non-allele genes. Additive gene effects played an important role in the inheritance patterns with a frequency of 81.1%. There was a significant positive correlation （r=0.7998） between the infection of head smut in F₁ and their parents, and a significant negative correlation between the resistant F₂ and susceptible F₁ （r=0.7639）. A conclusion was drawn henceforth, that, in order to select a resistant hybrid, both of the parents should be resistant, or at least, one of them be of the resistant line.更多还原