Erick O. Mikwa, Benjamin Wittkop, Steffen M. Windpassinger, Sven E. Weber, Dorit Ehrhardt, Rod J. Snowdon
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引用次数: 0
摘要
关键信息 我们发现了高粱多样性品系对磷饥饿的新型生理和遗传反应,这些反应增强了欧洲气候智能型作物育种的现有知识。 摘要 磷(P)缺乏和用于化肥生产的磷储备有限对未来全球作物生产构成威胁。了解根系结构(RSA)的可塑性是培育高效节磷作物的核心。高粱被认为是一种钾高效、气候智能型作物,对世界不同气候地区具有很强的适应性。在此,我们研究了高粱 RSA 对缺钾的早期遗传反应,以确定在低钾条件下具有有趣的根表型和反应的基因型。根系表型分析是在纸质水培根瘤系统中进行的,该系统是在温室受控条件下,在低磷营养和最佳磷营养条件下进行的,利用 16 个 RSA 性状来描述两个时间点的遗传和表型变异性。在发芽后 21 天和 42 天观察到多个根系性状的基因型和表型对 P 的响应变化,广义遗传率较高(0.38-0.76)。性状分类揭示了四种不同的高粱 RSA 类型,基因型在低 P 和最佳 P 条件下分别聚类,表明根系对 P 供应的反应受遗传控制。关联研究发现了染色体 Sb02、Sb03、Sb04、Sb06 和 Sb09 中的数量性状位点,这些位点与可能参与钾转运和胁迫反应的基因有关。通过基因分析 RSA 对缺钾反应的关键因素,可以及早鉴定出高钾效的高粱基因型。针对低磷环境具有有趣的 RSA 性状的基因型将被纳入当前的高粱育种计划,用于后期生长阶段和田间评估。
Early exposure to phosphorus starvation induces genetically determined responses in Sorghum bicolor roots
Key message
We identified novel physiological and genetic responses to phosphorus starvation in sorghum diversity lines that augment current knowledge of breeding for climate-smart crops in Europe.
Abstract
Phosphorus (P) deficiency and finite P reserves for fertilizer production pose a threat to future global crop production. Understanding root system architecture (RSA) plasticity is central to breeding for P-efficient crops. Sorghum is regarded as a P-efficient and climate-smart crop with strong adaptability to different climatic regions of the world. Here we investigated early genetic responses of sorghum RSA to P deficiency in order to identified genotypes with interesting root phenotypes and responses under low P. A diverse set of sorghum lines (n = 285) was genotyped using DarTSeq generating 12,472 quality genome wide single-nucleotide polymorphisms. Root phenotyping was conducted in a paper-based hydroponic rhizotron system under controlled greenhouse conditions with low and optimal P nutrition, using 16 RSA traits to describe genetic and phenotypic variability at two time points. Genotypic and phenotypic P-response variations were observed for multiple root traits at 21 and 42 days after germination with high broad sense heritability (0.38–0.76). The classification of traits revealed four distinct sorghum RSA types, with genotypes clustering separately under both low and optimal P conditions, suggesting genetic control of root responses to P availability. Association studies identified quantitative trait loci in chromosomes Sb02, Sb03, Sb04, Sb06 and Sb09 linked with genes potentially involved in P transport and stress responses. The genetic dissection of key factors underlying RSA responses to P deficiency could enable early identification of P-efficient sorghum genotypes. Genotypes with interesting RSA traits for low P environments will be incorporated into current sorghum breeding programs for later growth stages and field-based evaluations.
期刊介绍:
Theoretical and Applied Genetics publishes original research and review articles in all key areas of modern plant genetics, plant genomics and plant biotechnology. All work needs to have a clear genetic component and significant impact on plant breeding. Theoretical considerations are only accepted in combination with new experimental data and/or if they indicate a relevant application in plant genetics or breeding. Emphasizing the practical, the journal focuses on research into leading crop plants and articles presenting innovative approaches.