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首页> 美国卫生研究院文献>Plant Physiology >The Barley Uniculme4 Gene Encodes a BLADE-ON-PETIOLE-Like Protein That Controls Tillering and Leaf Patterning
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The Barley Uniculme4 Gene Encodes a BLADE-ON-PETIOLE-Like Protein That Controls Tillering and Leaf Patterning

机译：大麦Uniculme4基因编码控制分BL和叶片模式的BLADE-ON-PETIOLE-like蛋白

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摘要

Tillers are vegetative branches that develop from axillary buds located in the leaf axils at the base of many grasses. Genetic manipulation of tillering is a major objective in breeding for improved cereal yields and competition with weeds. Despite this, very little is known about the molecular genetic bases of tiller development in important Triticeae crops such as barley (Hordeum vulgare) and wheat (Triticum aestivum). Recessive mutations at the barley Uniculme4 (Cul4) locus cause reduced tillering, deregulation of the number of axillary buds in an axil, and alterations in leaf proximal-distal patterning. We isolated the Cul4 gene by positional cloning and showed that it encodes a BROAD-COMPLEX, TRAMTRACK, BRIC-À-BRAC-ankyrin protein closely related to Arabidopsis (Arabidopsis thaliana) BLADE-ON-PETIOLE1 (BOP1) and BOP2. Morphological, histological, and in situ RNA expression analyses indicate that Cul4 acts at axil and leaf boundary regions to control axillary bud differentiation as well as the development of the ligule, which separates the distal blade and proximal sheath of the leaf. As, to our knowledge, the first functionally characterized BOP gene in monocots, Cul4 suggests the partial conservation of BOP gene function between dicots and monocots, while phylogenetic analyses highlight distinct evolutionary patterns in the two lineages.
机译：分iller是无性的分支，从许多草根的叶腋上的腋芽萌发。分till的遗传操纵是育种的主要目标，以提高谷物的产量和与杂草的竞争。尽管如此，人们对重要的黑麦作物，例如大麦（Hordeum vulgare）和小麦（Triticum aestivum）的分till发育的分子遗传基础知之甚少。大麦Uniculme4（Cul4）位点的隐性突变导致分till减少，腋窝中腋芽数量的失调以及叶近端-远端模式的改变。我们通过位置克隆分离了Cul4基因，并显示它编码与拟南芥（Arabidopsis thaliana）BLADE-ON-PETIOLE1（BOP1）和BOP2密切相关的BROAD-COMPLEX，TRAMTRACK，BRIC-BRAC-锚蛋白。形态学，组织学和原位RNA表达分析表明，Cul4在腋窝和叶边界区域起作用，以控制腋芽的分化以及叶舌的发育，叶舌将叶片的远端叶片和近端鞘分开。据我们所知，这是单子叶植物中第一个功能上表征的BOP基因，Cul4表明双子叶植物和单子叶植物之间BOP基因功能的部分保守，而系统发育分析则突出了这两个世系中不同的进化模式。

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