玉米自交系灌浆期抗倒性评价及抗倒性状的相关分析

为筛选抗倒伏玉米种质,利用自然环境条件对108份玉米自交系的抗倒性进行了田间鉴定评价。结果表明:不同自交系间倒伏率存在极显著差异,筛选出高抗倒伏自交系12份,可作为抗倒基因源应用于抗倒伏育种。相关和通径分析结果表明,对倒伏影响最大的是茎皮抗穿刺强度(r=-0.576),其次为次生根数,均达极显著负相关,其中茎皮抗穿刺强度具有最大的直接通径系数(P=-0.450)。因此,提高茎皮抗穿刺强度,同时增加次生根数是提高玉米自交系抗倒伏的有效途径。

Evaluation of Lodging Resistance and Correlation Analysis of Lodging Resistance Characters for Maize Inbred Lines During Grain-filling Period

In order to screen maize germplasm with lodging resistance,108maize inbred lines were identified for lodging resistance in natural environment conditions.The results showed that there were extremely significant difference in lodging rate between different maize inbred lines,and 12genotypes with high resistance were screened,which could be used in maize breeding for lodging resistance.Correlation and path analysis indicated that the greatest impact on lodging was the rind penetrometer resistance（r=-0.576）,followed by secondary root number,covering extremely significant negative correlation,in which the rind penetrometer resistance had the greatest direct path coefficient（P=-0.450）.Therefore,raising the rind penetrometer resistance and secondary root number was the effective way to improve lodging resistance of maize inbred line.