生物
数量性状位点
遗传建筑学
遗传力
特质
侧根
遗传多样性
等位基因
农学
植物遗传学
驯化
基因组学
遗传学
遗传变异
全基因组关联研究
适应(眼睛)
作物
数量遗传学
耐旱性
功能基因组学
表型
植物
上位性
叶大小
遗传增益
候选基因
基因
营养繁殖
作者
Fabio Guffanti,Daniela Scheuermann,Claude Urbany,Stefan Reuscher,Thomas Presterl,Milena Ouzunova,Silvio Salvi,Caroline Callot,Chris-Carolin Schön
摘要
Understanding the genetic basis of root architecture and its relevance for crop productivity can contribute to the sustainable intensification of agriculture. Leveraging the phenotypic and allelic diversity of an Austrian maize landrace, we dissected the genetic basis of lateral root (LR) length across developmental stages. LR length, a relevant trait for breeding resource-efficient varieties, showed high heritability in our experiments. We discovered eight quantitative trait loci (QTL) for LR length at the reproductive stage R2, overlapping with four QTL at stage R6 but not with QTL detected at vegetative stage V6, suggesting that the genetic regulation of LR length might differ in vegetative and reproductive stages. We fine-mapped qlr1, the most significant QTL for LR length, to a region of 2.3 Mb containing 46 annotated genes. Based on whole-genome sequence and comparative genomics analyses we suggest a candidate gene underlying qlr1. Additionally, we examined the impact of nitrogen, phosphorus, and irrigation treatments on root and shoot development, finding that LR length positively correlates with biomass accumulation under optimal nutrient supply but not under nitrogen stress. Our work provides insights into the genetic regulation of LR length in maize and its relevance for the adaptation to diverse growing environments.
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