DOI码：10.1007/s10681-022-03096-8
发表刊物：Euphytica
关键字：Maize · Grain · Dry matter accumulation · Grain yield
摘要：Dry matter accumulation (DMA) in kernels is critical for high-yield maize harvesting. However, the genetic mechanism by which DMA affects grain weight remains elusive. We conducted a quantitative trait locus (QTL) analysis of DMA using a recombinant inbred line population at different grain filling stages under three environmental conditions. For most maize inbred lines, about 90% of DMA was completed within 45 days after pollination (DAP). Using 0–45 DAP as an active grain-filling period, we identified 13 DMA QTLs, each explaining 7.11–23.64% of the total phenotypic variation. Four of them, qDMA5.2, qDMA6.4, qDMA7.2, and qDMA9.2, were consistently detected in at least two of three field trials. At the next grain-filling stage after 45 DAP when the DMA is leveling-off, a total of 18 QTLs were identified, accounting for 8.49– 28.66% of the total phenotypic variation, of which only qDMA1.2 was consistently observed for two years. Since consistent DMA QTLs were discovered at either the active grain-filling stage (0–45 DAP) or at the later stage after 45 DAP, it is hypothesized that the genetic regulation of DMA proceeds in a stagedependent manner. Our results will aid in deciphering the genetic basis of grain yield development and provide insight into grain yield improvement in maize.
论文类型：Research Atricle
文献类型：J
卷号：218
页面范围：151
是否译文：否
发表时间：2022-09-26