Natural variation and domestication selection of ZmSULTR3;4 is associated with maize lateral root length in response to salt stress.
Natural variation and domestication selection of ZmSULTR3;4 is associated with maize lateral root length in response to salt stress.
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DOI：
10.3389/fpls.2022.992799
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发表时间：
2022
影响因子：
5.6
通讯作者：
中科院分区：
文献类型：
--
作者：
土壤盐碱化是制约全球农作物产量的一个主要因素。侧根是植物获取水分和养分的重要途径，了解侧根长度自然变异的遗传基础对提高植物的耐盐性具有重要意义。在这里，使用全基因组关联研究，我们表明，ZmSULTR 3的遗传变异;4，它编码质膜定位的硫酸盐转运蛋白，与盐胁迫下玉米LRL的自然变异。ZmSULTR 3的转录本; 4在根的表皮和维管组织中优先存在，并在盐胁迫下增加，支持其在盐胁迫下LR形成中的重要作用。进一步的候选基因关联分析表明，ZmSULTR 3;4基因启动子区的DNA多态性在玉米自交系中的表达存在差异，这可能是盐胁迫下LRL基因自然变异的原因之一。核苷酸多样性和中性测试表明，ZmSULTR 3;4在玉米驯化和改良过程中经历了选择。研究结果揭示了ZmSULTR 3;4在盐胁迫下对玉米幼苗生长的调控作用，并揭示了ZmSULTR 3;4的有利等位基因，为玉米耐盐品种的选育提供了重要的选择目标。
Soil salinity is a major constraint that restricts crop productivity worldwide. Lateral roots (LRs) are important for water and nutrient acquisition, therefore understanding the genetic basis of natural variation in lateral root length (LRL) is of great agronomic relevance to improve salt tolerance in cultivated germplasms. Here, using a genome-wide association study, we showed that the genetic variation in ZmSULTR3;4, which encodes a plasma membrane-localized sulfate transporter, is associated with natural variation in maize LRL under salt stress. The transcript of ZmSULTR3;4 was found preferentially in the epidermal and vascular tissues of root and increased by salt stress, supporting its essential role in the LR formation under salt stress. Further candidate gene association analysis showed that DNA polymorphisms in the promoter region differentiate the expression of ZmSULTR3;4 among maize inbred lines that may contribute to the natural variation of LRL under salt stress. Nucleotide diversity and neutrality tests revealed that ZmSULTR3;4 has undergone selection during maize domestication and improvement. Overall, our results revealed a regulatory role of ZmSULTR3;4 in salt regulated LR growth and uncovered favorable alleles of ZmSULTR3;4, providing an important selection target for breeding salt-tolerant maize cultivar.
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