240份玉米自交系纹枯病抗性鉴定与评价

在人工接种条件下,连续3年对240份玉米自交系纹枯病抗性进行鉴定和评价,分析了玉米纹枯病抗性与主要农艺性状的相关性。结果表明,玉米纹枯病抗性资源较为缺乏,240份自交系中无免疫或高抗的材料,有中抗自交系4份、感病自交系18份、高感自交系218份。旅大红骨、Reid、PA和塘四平头类群自交系中未发现玉米纹枯病抗源,PB类群和Lancaster类群自交系纹枯病抗性相对较好,今后应主要从这两类种质中寻找玉米纹枯病抗源。玉米纹枯病病情指数与株高、穗位高、穗位高/株高、穗下节间数和穗下平均节间长均呈极显著负相关,这些表型可以作为非接种条件下筛选抗玉米纹枯病种质的参考指标。

Identification and evaluation of 240 Maize Inbred Lines for Resistant to Banded Leaf and Sheath Blight

Two hundred and forty inbred lines were identified and evaluated for the resistance to banded leaf and sheath blight (BLSB) under artificial inoculation conditions from 2010 to 2012.Meanwhile, the correlation between the resistance to BLSB and major agronomic traits were also analysis. The results showed that there were no immune nor highly resistant lines, four inbred lines with moderately resistant to BLSB, and 236 lines were sensitive to BLSB, among which 218 lines were highly sensitive to BLSB. Meanwhile, there were no resistance lines in Reid, Lvdahonggu, PA and Tangsipingtou genetic groups, however, Lancaster and PB genetic groups were identified to be important sources for maize BLSB resistance. Additionally, the results of correlation analysis showed that five traits, such as plant height, ear height, ear height / plant height, internodes number below the ear and internodes length below the ear, were significantly negative correlated with the disease index. These traits can be used as the reference for screening germplasm with resistance to BLSB without artificial inoculation.