Carbon isotope composition, water use efficiency, and drought sensitivity are controlled by a common genomic segment in maize.
Carbon isotope composition, water use efficiency, and drought sensitivity are controlled by a common genomic segment in maize.
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DOI：
10.1007/s00122-018-3193-4
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发表时间：
2019-01
期刊：
影响因子：
--
通讯作者：
Schön CC
中科院分区：
文献类型：
--
作者：
Avramova V;Meziane A;Bauer E;Blankenagel S;Eggels S;Gresset S;Grill E;Niculaes C;Ouzunova M;Poppenberger B;Presterl T;Rozhon W;Welcker C;Yang Z;Tardieu F;Schön CC
玉米7号染色体上的一个基因组片段可能通过影响气孔特性来影响碳同位素组成、水分利用效率和叶片对干旱的敏感性。气候变化预计将减少全球许多农业产区的水资源供应。因此，迫切需要提高植物在水分亏缺下生长的能力。我们结合遗传学、物候学和生理学的方法来了解玉米(Zea Mays L.)的生长、气孔导度、水分利用效率和碳同位素组成之间的关系。利用来自玉米导入文库的近等基因系，我们分析了以前被确定为影响碳同位素组成的基因组区域的影响。经过几年的田间试验，我们证明了性状表达的稳定性，并在表型鉴定平台Phenodyn中证明，相同的基因组区域也影响叶片生长对蒸发需求和土壤水势的敏感性。我们的结果表明，影响碳同位素识别的基因组区域也含有数量性状基因，这些基因可能通过气孔行为和发育影响玉米对干旱的敏感性。我们认为，观察到的表型共同起源于气孔导度的改变，可能是通过脱落酸。本文的在线版本(10.1007/s00122-0183193-4)包含向授权用户提供的补充材料。
A genomic segment on maize chromosome 7 influences carbon isotope composition, water use efficiency, and leaf growth sensitivity to drought, possibly by affecting stomatal properties. Climate change is expected to decrease water availability in many agricultural production areas around the globe. Therefore, plants with improved ability to grow under water deficit are urgently needed. We combined genetic, phenomic, and physiological approaches to understand the relationship between growth, stomatal conductance, water use efficiency, and carbon isotope composition in maize (Zea mays L.). Using near-isogenic lines derived from a maize introgression library, we analysed the effects of a genomic region previously identified as affecting carbon isotope composition. We show stability of trait expression over several years of field trials and demonstrate in the phenotyping platform Phenodyn that the same genomic region also influences the sensitivity of leaf growth to evaporative demand and soil water potential. Our results suggest that the studied genomic region affecting carbon isotope discrimination also harbours quantitative trait loci playing a role in maize drought sensitivity possibly via stomatal behaviour and development. We propose that the observed phenotypes collectively originate from altered stomatal conductance, presumably via abscisic acid. The online version of this article (10.1007/s00122-018-3193-4) contains supplementary material, which is available to authorized users.
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