Natural variation of barley vernalization requirements: Implication of quantitative variation of winter growth habit as an adaptive trait in East Asia.
Natural variation of barley vernalization requirements: Implication of quantitative variation of winter growth habit as an adaptive trait in East Asia.
复制标题
大麦春化要求的自然变化：冬季生长习性的数量变化作为东亚适应性性状的含义。
DOI：
10.1093/pcp/pcr046
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
K. Hori and K. Sato
中科院分区：
文献类型：
--
作者：
D. Saisho;M. Ishii;K. Hori and K. Sato
在许多温带植物物种中，长时间的冷处理，即春化，是从营养阶段向生殖阶段过渡的最关键的步骤之一。与了解拟南芥非春化突变体春化的分子基础或小麦和大麦等谷类作物春季生长习性的最新进展相比，人们对冬季生长习性的自然变异及其地理分布知之甚少。我们分析了驯化大麦和野生大麦种质资源春化需求程度的品种变异和地理分布。我们发现驯化大麦春化需求的地理分布存在偏差：西部地区与较高程度的春季生长习性密切相关，而极端冬季生长习性则局限于远东地区，包括中国、韩国和日本。野生种质和驯化地方种质的分布区域相互重叠，主要属于越冬生长习性的中等级。结果表明，重组自交系冬季生长习性的变异是由数量性状基因控制的，其中3个春化基因(VRN1、VRN2和VRN3)解释了春化需求的37.9%，未知基因(S)解释了其余三分之二的变异。这一证据表明，远东种质可能是由于进化原因而产生的遗传分化群体，导致它们更倾向于冬季生长习性。
In many temperate plant species, prolonged cold treatment, known as vernalization, is one of the most critical steps in the transition from the vegetative to the reproductive stage. In contrast to recent advances in understanding the molecular basis of vernalization in Arabidopsis non-vernalization mutants or the spring growth habits of cereal crops such as wheat and barley, natural variations in winter growth habits and their geographic distribution are poorly understood. We analyzed varietal variation and the geographic distribution of the degree of vernalization requirements in germplasms of domesticated barley and wild barley collections. We found a biased geographic distribution of vernalization requirements in domesticated barley: Western regions were strongly associated with a higher degree of spring growth habits, and the extreme winter growth habits were localized to Far Eastern regions including China, Korea and Japan. Both wild accessions and domesticated landraces, the regions of distribution of which overlapped each other, mainly belonged to the moderate class of winter growth habit. As a result of quantitative evaluations performed in this study, we provide evidence that the variation in the degree of winter growth habit in recombinant inbred lines was controlled by quantitative trait loci including three vernalization genes (VRN1,VRN2andVRN3) that account for 37.9% of the variation in vernalization requirements, with unknown gene(s) explaining the remaining two-thirds of the variation. This evidence implied that the Far Eastern accessions might be a genetically differentiated group derived for an evolutionary reason, resulting in their greater tendency towards a winter growth habit.