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首页> 外文期刊>Israel Journal of Plant Sciences >Spatial and temporal genetic structure of wild emmer wheat in Jordan. I. Phenotypic traits
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Spatial and temporal genetic structure of wild emmer wheat in Jordan. I. Phenotypic traits

机译：约旦野生Emmer小麦的时空遗传结构。一，表型性状

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摘要

Natural populations of wild emmer wheat in Jordan represent a unique and sizable part of the species' distribution in the Fertile Crescent. However, information on their genetic structure and diversity is limited. An understanding of the way genetic variation is partitioned among these populations is of primary importance for the ex situ sampling and in situ conservation of their genetic diversity. Fourteen categorical traits were used to characterize different phenotypes found in 12 wild emmer wheat populations in Jordan. They were scored in plants growing in 207 marked sampling sites and representing a wide range of observable variation. A strong effect of the heterogeneous habitats, encountered across collecting sites, was reflected in the magnitude and spatial distribution of phenotypic diversity. Several, and probably unique, first- and second-order associations among phenotypic traits reflect functional adaptation of the species to and and semiarid Mediterranean environments. Phenotypic distances among populations were highly influenced by latitude and rainfall quotient (Q2) of collection sites. Spatial factors accounted for large portions (60.5-93.1%) of total variation in phenotypic diversity indices, suggesting strong provenance specificity. Temporal variation was less pronounced than spatial variation, and there were no drastic changes between years in frequencies of genotypes. Both spatial and temporal variation varied among populations.
机译：约旦野生Emmer小麦的自然种群代表了Fertile Crescent中该物种分布的独特而可观的一部分。但是，有关其遗传结构和多样性的信息有限。了解遗传变异在这些种群之间的分配方式，对于对其遗传多样性进行异地采样和就地保护至关重要。使用十四种分类性状表征在约旦的12个野生Emmer小麦种群中发现的不同表型。他们在207个标记的采样点生长的植物中进行了评分，代表了可观察到的广泛变化。表型多样性的大小和空间分布反映了在不同采集地点遇到的异质生境的强烈影响。表型性状之间的几种（可能是独特的）一阶和二阶关联反映了该物种对地中海和半干旱环境的功能适应性。人口之间的表型距离受收集地点的纬度和雨商（Q2）的影响很大。在表型多样性指数的总变化中，空间因素占很大一部分（60.5-93.1％），表明很强的种源特异性。时间上的变化不如空间上的变化显着，并且基因型频率之间的年份之间没有剧烈变化。人口之间的时空变化都不同。

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