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首页> 外文期刊>Theoretical and Applied Genetics: International Journal of Breeding Research and Cell Genetics >QTL analysis of frost damage in pea suggests different mechanisms involved in frost tolerance
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QTL analysis of frost damage in pea suggests different mechanisms involved in frost tolerance

机译：豌豆霜冻危害的QTL分析表明，不同的耐霜冻机理有关

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摘要

Avoidance mechanisms and intrinsic resistance are complementary strategies to improve winter frost tolerance and yield potential in field pea. The development of the winter pea crop represents a major challenge to expand plant protein production in temperate areas. Breeding winter cultivars requires the combination of freezing tolerance as well as high seed productivity and quality. In this context, we investigated the genetic determinism of winter frost tolerance and assessed its genetic relationship with yield and developmental traits. Using a newly identified source of frost resistance, we developed a population of recombinant inbred lines and evaluated it in six environments in Dijon and Clermont-Ferrand between 2005 and 2010. We developed a genetic map comprising 679 markers distributed over seven linkage groups and covering 947.1 cM. One hundred sixty-one quantitative trait loci (QTL) explaining 9-71 % of the phenotypic variation were detected across the six environments for all traits measured. Two clusters of QTL mapped on the linkage groups III and one cluster on LGVI reveal the genetic links between phenology, morphology, yield-related traits and frost tolerance in winter pea. QTL clusters on LGIII highlighted major developmental gene loci (Hr and Le) and the QTL cluster on LGVI explained up to 71 % of the winter frost damage variation. This suggests that a specific architecture and flowering ideotype defines frost tolerance in winter pea. However, two consistent frost tolerance QTL on LGV were independent of phenology and morphology traits, showing that different protective mechanisms are involved in frost tolerance. Finally, these results suggest that frost tolerance can be bred independently to seed productivity and quality.
机译：避免机制和内在抗性是提高豌豆冬季抗冻性和增产潜力的补充策略。冬季豌豆作物的发展代表了在温带地区扩大植物蛋白产量的主要挑战。冬季育种需要兼具耐寒性，高种子产量和高质量。在这种情况下，我们调查了冬季抗霜冻性的遗传决定论，并评估了其与产量和发育性状的遗传关系。使用新鉴定的抗冻源，我们在2005年至2010年之间在第戎和克莱蒙费朗的六个环境中开发了重组自交系种群，并对其进行了评估。我们开发了一个遗传图谱，包括分布在七个连锁组上的679个标记，覆盖947.1厘米。在六个环境中，对于所有测量的性状，共检测到161个定量性状基因座（QTL），解释了9-71％的表型变异。定位在连锁群III上的两个QTL集群和LGVI上的一个集群揭示了冬豌豆的物候，形态，产量相关性状与抗冻性之间的遗传联系。 LGIII上的QTL簇突出了主要的发育基因位点（Hr和Le），而LGVI上的QTL簇解释了高达71％的冬季霜冻损害变化。这表明特定的结构和开花表型定义了豌豆的抗冻性。但是，LGV上两个一致的抗冻性QTL与物候和形态性状无关，表明抗冻性涉及不同的保护机制。最后，这些结果表明，可以独立于种子的生产力和质量来培育抗冻性。

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