Abstract
The low ratio of ear-to-plant heights (EPR) contributes to the balance and stability of maize plant’s center of gravity, resulting in reduced lodging for high grain yield. Previous studies on EPR of maize plants in response to ethylene mainly focused on phenotypic correlations with grain yield or stalk trait. In this study, QTL mapping by SNPs marker for EPR of maize plants was analyzed under ethylene treatment (ET) and non-ET control. The results indicated that ET significantly decreased phenotypic performance of EPR. High variance of EPR among RIL population showed a normal distribution. Five QTLs associated with EPR were identified under the two treatments using composition–interval mapping. The phenotypic variance observed by an individual QTL ranged from 5.69 to 10.02%. Two QTLs (qEPR1, qEPR2-2) were identified in ET treatment. One QTL (qEPR2-2) was simultaneously detected in both treatments at two geographic locations. These stable and consistent QTLs were important spots for EPR. Our findings provided important information for the fine mapping of quantitative trait genes and would help to reveal the molecular mechanisms of how EPR response to the application of ethylene.
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