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首页> 美国卫生研究院文献>Plant Physiology >Focus Issue on Phosphorus Plant Physiology: Regulatory Hotspots Are Associated with Plant Gene Expression under Varying Soil Phosphorus Supply in Brassica rapa
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Focus Issue on Phosphorus Plant Physiology: Regulatory Hotspots Are Associated with Plant Gene Expression under Varying Soil Phosphorus Supply in Brassica rapa

机译：磷植物生理学的热点问题：甘蓝型油菜土壤磷素供应变化下调控热点与植物基因表达相关

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摘要

Gene expression is a quantitative trait that can be mapped genetically in structured populations to identify expression quantitative trait loci (eQTL). Genes and regulatory networks underlying complex traits can subsequently be inferred. Using a recently released genome sequence, we have defined cis- and trans-eQTL and their environmental response to low phosphorus (P) availability within a complex plant genome and found hotspots of trans-eQTL within the genome. Interval mapping, using P supply as a covariate, revealed 18,876 eQTL. trans-eQTL hotspots occurred on chromosomes A06 and A01 within Brassica rapa; these were enriched with P metabolism-related Gene Ontology terms (A06) as well as chloroplast- and photosynthesis-related terms (A01). We have also attributed heritability components to measures of gene expression across environments, allowing the identification of novel gene expression markers and gene expression changes associated with low P availability. Informative gene expression markers were used to map eQTL and P use efficiency-related QTL. Genes responsive to P supply had large environmental and heritable variance components. Regulatory loci and genes associated with P use efficiency identified through eQTL analysis are potential targets for further characterization and may have potential for crop improvement.
机译：基因表达是一种定量性状，可以在结构化种群中进行遗传定位，以鉴定表达定量性状位点（eQTL）。随后可以推断出具有复杂特征的基因和调控网络。使用最近发布的基因组序列，我们定义了顺式和反式eQTL及其对复杂植物基因组中低磷（P）可用性的环境响应，并在基因组内发现了反式eQTL的热点。使用P供应作为协变量的时间间隔映射显示18,876 eQTL。反式-eQTL热点发生在甘蓝型油菜内的A06和A01染色体上。这些富含P代谢相关基因本体论术语（A06）以及叶绿体和光合作用相关术语（A01）。我们还将遗传因素归因于跨环境的基因表达测量，从而可以鉴定新的基因表达标记和与低P可用性相关的基因表达变化。信息性基因表达标记用于定位eQTL和P使用效率相关的QTL。对磷供应有反应的基因具有较大的环境和遗传变异成分。通过eQTL分析确定的与磷利用效率相关的调控基因座和基因是进一步表征的潜在目标，并且可能具有改善作物的潜力。

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