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Multiple QTLs Linked to Agro-Morphological and Physiological Traits Related to Drought Tolerance in Potato

机译：与马铃薯耐旱性相关的农貌和生理特性相关的多个QTL

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Dissection of the genetic architecture of adaptation and abiotic stress-related traits is highly desirable for developing drought-tolerant potatoes and enhancing the resilience of existing cultivars, particularly as agricultural production in rain-fed areas may be reduced by up to 50 % by 2020. The “DMDD” potato progeny was developed at International Potato Center (CIP) by crossing the sequenced double monoploid line DM and a diploid cultivar of the Solanum tuberosum diploid Andigenum Goniocalyx group. Recently, a high-density integrated genetic map based on single nucleotide polymorphism (SNP), diversity array technology (DArT), simple sequence repeats (SSRs), and amplified fragment length polymorphism (AFLP) markers was also made available for this population. Two trials were conducted, in greenhouse and field, for drought tolerance with two treatments each, well-watered and terminal drought, in which watering was suspended 60 days after planting. The DMDD population was evaluated for agro-morphological and physiological traits before and after initiation of stress, at multiple time points. Two dense parental genetic maps were constructed using published genotypic data, and quantitative trait locus (QTL) analysis identified 45 genomic regions associated with nine traits in well-watered and terminal drought treatments and 26 potentially associated with drought stress. In this study, the strong influence of environmental factors besides water shortage on the expression of traits and QTLs reflects the multigenic control of traits related to drought tolerance. This is the first study to our knowledge in potato identifying QTLs for drought-related traits in field and greenhouse trials, giving new insights into genetic architecture of drought-related traits. Many of the QTLs identified have the potential to be used in potato breeding programs for enhanced drought tolerance.
机译：解剖适应性和非生物胁迫相关性状的遗传结构对于开发耐旱马铃薯和增强现有品种的抗逆性非常必要，特别是因为到2020年雨水喂养地区的农业产量可能减少多达50％。 “ DMDD”马铃薯后代是在国际马铃薯中心（CIP）上通过将测序的双单倍体系DM与马铃薯二倍体Andigenum Goniocalyx组的二倍体品种杂交而开发的。最近，基于单核苷酸多态性（SNP），多样性阵列技术（DArT），简单序列重复（SSRs）和扩增片段长度多态性（AFLP）标记的高密度综合遗传图谱也已提供给该人群。在温室和田间进行了两项试验，分别针对干旱和耐旱性进行了两种处理，分别是浇水充足和终末干旱，其中种植后60天暂停浇水。在胁迫开始之前和之后，在多个时间点对DMDD群体的农业形态和生理特性进行了评估。使用公开的基因型数据构建了两个密集的亲本遗传图谱，定量性状基因座（QTL）分析确定了45个基因组区域，与适当灌溉和最终干旱处理中的9个性状相关，还有26个潜在与干旱胁迫相关的基因组区域。在这项研究中，除了缺水以外，环境因素对性状和QTL表达的强烈影响反映了与耐旱性相关的性状的多基因控制。这是我们对马铃薯鉴定田间和温室试验中与干旱有关的性状的QTL的第一项研究，为对干旱相关性状的遗传结构提供了新的见解。已确定的许多QTL有潜力用于马铃薯育种计划中以增强抗旱性。

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