Haplotype variations in QTL for salt tolerance in Chinese wheat accessions identified by markerbased and pedigree-based kinship analyses
Haplotype variations in QTL for salt tolerance in Chinese wheat accessions identified by markerbased and pedigree-based kinship analyses
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基于标记和谱系的亲缘关系分析鉴定中国小麦种质耐盐性QTL单倍型变异
DOI：
10.1016/j.cj.2020.03.007
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发表时间：
2020
期刊：
影响因子：
6.6
通讯作者：
Han Dejun
中科院分区：
文献类型：
--
作者：
Yu Shizhou;Wu Jianhui;Wang Meng;Shi Weiming;Xia Guangmin;Jia Jizeng;Kang Zhensheng;Han Dejun
大多数现代小麦品种都是根据最佳化肥和灌溉投入下测得的产量相关指标来选择的。随着气候变化、土地退化和海水侵蚀造成的盐碱化，小麦日益受到环境压力。此外，不断扩大的城市化日益侵占中国等国家的主要农业用地，必须寻找替代种植区。其中一些地区具有中等约束因素，例如 因此，调查当前的遗传物质和育种程序是否保持足够的变异性以解决未来由非生物胁迫引起的问题非常重要。在本研究中，对 307 个小麦种质（包括当地地方品种、中国育种计划中使用的外来品种以及 1940 年以来不同时期发布的中国品种）进行了全基因组关联研究，以剖析耐盐性的遗传基础。 基于谱系的亲缘关系分析表明，一些外来品种以及20世纪40年代以来有限数量的中国地方品种中引入了有利的单倍型。然而，现代育种过程中耐盐性的改善并不像产量的改善那么明显。为了扩大耐盐性的遗传多样性，需要重新关注具有高度耐盐性并携带稀有有利盐的地方品种。 尚未在育种中利用的等位基因。
Most modern wheat cultivars were selected on the basis of yield-related indices measured under optimal fertilizer and irrigation inputs.With climate change, land degradation and salinity caused by sea water encroachment, wheat is increasingly subjected to environmental stress.Moreover, expanding urbanization increasingly encroaches upon prime agricultural land in countries like China, and alternative cropping areas must be found.Some of these areas have moderate constraining factors, such as salinity.Therefore, it is important to investigate whether current genetic materials and breeding procedures are maintaining adequate variability to address future problems caused by abiotic stress.In this study, a panel of 307 wheat accessions, including local landraces, exotic cultivars used in Chinese breeding programs and Chinese cultivars released during different periods since 1940, were subjected to a genome-wide association study to dissect the genetic basis of salinity tolerance.Both marker-based and pedigree-based kinship analyses revealed that favorable haplotypes were introduced in some exotic cultivars as well as a limited number of Chinese landraces from the 1940s.However, improvements in salinity tolerance during modern breeding are not as obvious as that of yield.To broaden genetic diversity for increasing salt tolerance, there is a need to refocus attention on local landraces that have high degrees of salinity tolerance and carry rare favorable alleles that have not been exploited in breeding.