Radial leaves of the maize mutant ragged seedling2 retain dorsiventral anatomy
Radial leaves of the maize mutant ragged seedling2 retain dorsiventral anatomy
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DOI：
10.1016/j.ydbio.2005.03.027
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发表时间：
2005-06-15
影响因子：
2.7
通讯作者：
Scanlon, MJ
中科院分区：
文献类型：
--
作者：
Henderson, DC;Muehlbauer, GJ;Scanlon, MJ
RGD2是影响玉米侧器官发育的一种新的隐性突变。RGD2-R纯合子叶片的突变表型多种多样。轻度叶表型中脉缩小，可能中等狭窄和分叉；重度RGD2-R叶丝状甚至放射状。尽管有放射状的形态，严重的Rgd2-R-突变叶片发展出不同的近轴面和背轴面解剖特征。尽管RGD2-R-突变体在近轴或远轴细胞类型上没有减少，但可能会发生与维管束错位和异位边缘突起相关的表皮细胞互换区域。幼嫩原基的扫描电子显微镜和突变体顶端叶发育标记基因表达的分析表明，RGD2在叶创始细胞的募集和叶原基的膨大生长过程中发挥作用。总体而言，这些表型表明Rgd2-R-突变体叶片的发育不协调，因此叶片成分和组织可能是准独立发育的。模型，其中RGD2是需要的发育信号在玉米叶片的起始，解剖模式，和横向展开进行了讨论。(C)2005 Elsevier Inc.保留所有权利。
ragged seedling2 (rgd2) is a novel, recessive mutation affecting lateral organ development in maize. The mutant phenotype of homozygous rgd2-R leaves is variable. Mild leaf phenotypes have a reduced midrib and may be moderately narrow and furcated; severe Rgd2-R- leaves are filamentous or even radial. Despite their radial morphology, severe Rgd2-R- mutant leaves develop distinct adaxial and abaxial anatomical features. Although Rgd2-R- mutants exhibit no reduction in adaxial or abaxial cell types, areas of epidermal cell swapping may occur that are associated with misaligned vascular bundles and outgrowths of ectopic margins. Scanning electron microscopy of young primordia and analyses of leaf developmental-marker gene expression in mutant apices reveal that RGD2 functions during recruitment of leaf founder cells and during expansive growth of leaf primordia. Overall, these phenotypes suggest that development is uncoordinated in Rgd2-R- mutant leaves, so that leaf components and tissues may develop quasi-independently. Models whereby RGD2 is required for developmental signaling during the initiation, anatomical patterning, and lateral expansion of maize leaves are discussed. (c) 2005 Elsevier Inc. All rights reserved.