Abstract
Yield is the most important aim for maize breeding; however, fine mapping and cloning of genes for yield-related traits is relatively difficult. ABERRANT PANICLE ORGANIZATION1 ( APO1 ) controlling panicle structure enhances lodging resistance and improves grain yield in rice. In this study, two homologs of OsAPO1 , ZmAPO1-6 and ZmAPO1-9 ,were cloned in maize. Both of them share an F-box domain and have more than 83% amino acid identity with OsAPO1. RT-PCR analysis reveals that they are mainly expressed in the ears. Association mapping analysis was then conducted using about 200 testcrossing hybrids of an S type cytoplasmic male sterility line with diverse maize inbreds. A total of 14 and eight significant loci for five yield-related traits were identified, and the loci in ZmAPO1-6 were mainly related to plant height and stem diameter, while those in ZmAPO1-9 were mainly related to kernel weight. The results of this study implies that the two homologs might be related to yield-related traits in maize, and would facilitate further study of their detailed functions.
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