不同玉米品种对瘤黑粉病抗性的初步鉴定

选择22个玉米品种,在苗期采用注射法人工接种玉米黑粉菌,对玉米瘤黑粉病发病时间、发病率、病情指数进行统计分析,以鉴定玉米品种对瘤黑粉病的抗病性。结果表明:接种8 d后,玉米品种陆续开始发病,第13天进入发病增速期,第16天达到发病高峰期,第18天后病情基本稳定;玉米品种间对瘤黑粉病的抗性存在差异,其中LD901、太平洋891表现为高抗,京科665、金糯628表现为中抗,耐斯1号、京单38、南美1号等12个品种表现为抗病,糯2000、太平洋98、Golden Bautam、中彩甜糯8号、15H–09、绿色先锋F1表现为感病。

Primary identification of resistance in different maize varieties toUstilago maydis

Maise seedlings from 22 of maise varieties were inoculated withUstilago maydis by artificial injection,and disease resistance of these maise varieties were evaluated by onset of symptom, incidence rate and disease index. The results showed that the infection symptom was first observed at eight days post inoculation (dpi), the diseased maize of all varieties developed quickly since 13 dpi and become outbreak until 16 dpi and disease status become stable from 18 dpi. Disease resistance was different among maize varieties: varieties LD901 and TPY891 showed to be high resistant, varieties JK665 and JN628 showed to be middle resistant and 12 varieties of maize, such as NS1, JD38 and NM1 showed resistant toUstilago maydis while varieties N2000, TPY98, Golden Bautam, ZCTN8, 15H–09 and LSXF F1 showed to be susceptible toUstilago maydis.