Ear weight is one of the most important agronomic traits considered necessary in maize (Zea mays L.) breeding projects. To determine its genetic basis, a population consisting of 239 recombinant inbred lines, derived from the cross Mo17 x Huangzao4, was used to detect quantitative trait loci (QTLs) for ear weight under two nitrogen regimes. Under a high nitrogen fertilization regime, one QTL was identified in chromosome bin 2.08-2.09, which explained 7.46% of phenotypic variance and an increase in ear weight of about 5.79 g, owing to an additive effect. Under a low nitrogen regime, another QTL was identified in chromosome bin 1.10-1.11; it accounted for 7.11% of phenotypic variance and a decrease of 5.24 g in ear weight, due to an additive effect. Based on comparisons with previous studies, these two QTLs are new loci associated with ear weight in maize. These findings contribute to our knowledge about the genetic basis of ear weight in maize.
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机译：穗重是玉米（Zea mays L.）育种项目中必需的最重要的农艺性状之一。为了确定其遗传基础，使用了由Mo17 x Huangzao4杂交得到的239个重组自交系组成的种群，在两个氮机制下检测耳朵重量的定量性状基因座（QTL）。在高氮施肥制度下，在染色体bin 2.08-2.09中鉴定出一个QTL，这解释了7.46％的表型变异和由于加性效应而使耳重增加了约5.79 g。在低氮条件下，在1.1-1.11号染色体中鉴定出另一个QTL；由于累加效应，它占表型变异的7.11％，耳朵重量减少5.24 g。根据与先前研究的比较，这两个QTL是与玉米穗重相关的新基因座。这些发现有助于我们了解玉米穗重的遗传基础。
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