This study provides insights in patterns of distribution of abiotic and biotic stress resilience across Vigna gene pools to enhance the use and conservation of these genetic resources for legume breeding. Vigna is a pantropical genus with more than 88 taxa including important crops such as V. radiata (mung bean) and V. unguiculata (cowpea). Our results show that sources of pest and disease resistance occur in at least 75 percent of the Vigna taxa, which were part of screening assessments, while sources of abiotic stress resilience occur in less than 30 percent of screened taxa. This difference in levels of resilience suggests that Vigna taxa co-evolve with pests and diseases while taxa are more conservative to adapt to climatic changes and salinization. Twenty-two Vigna taxa are poorly conserved in genebanks or not at all. This germplasm is not available for legume breeding and requires urgent germplasm collecting before these taxa extirpate on farm and in the wild. Vigna taxa, which tolerate heat and drought stress are rare compared with taxa, which escape these stresses because of short growing seasons or with taxa, which tolerate salinity. We recommend prioritizing these rare Vigna taxa for conservation and screening for combined abiotic and biotic stress resilience resulting from stacked or multifunctional traits. The high presence of salinity tolerance compared with drought stress tolerance, suggests that Vigna taxa are good at developing salt-tolerant traits. Vigna taxa are therefore of high value for legume production in areas that will suffer from salinization under global climate change.

译文

:这项研究提供了关于跨Vigna基因库的非生物和生物逆境适应力分布模式的见解,以增强对豆类育种的这些遗传资源的利用和保护。 Vigna是一种泛热带属,有超过88个分类单元,包括重要的农作物,例如辐射绿豆(V. radiata)(绿豆)和V. unguiculata(co豆)。我们的结果表明,至少有75%的the豆类生物发生病虫害和抗病性,这是筛选评估的一部分,而非生物逆境恢复力的来源中则只有不到30%的经过筛选的生物种。复原力水平的这种差异表明,gna豆类群与病虫害共同进化,而分类群则更为保守以适应气候变化和盐碱化。在基因库中,有22个Vigna分类群保存得很差,或者根本没有保存。该种质无法用于豆科植物育种,需要在农场和野外消灭这些类群之前紧急收集种质。耐高温和干旱胁迫的豆类生物很少见,而由于生长季节短或可耐受盐分的类群则可以避开这些压力。我们建议优先考虑这些稀有的gna豆类群,以保护和筛选因堆叠或多功能性状而导致的非生物和生物复合胁迫适应性。与干旱胁迫耐受性相比,盐分耐受性的高存在表明Vigna分类群擅长发展耐盐性状。因此,在全球气候变化导致盐碱化的地区,豆科植物对豆类生产具有很高的价值。

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