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首页> 外文期刊>Plant physiology >A fiberless seed mutation in cotton is associated with lack of fiber cell initiation in ovule epidermis and alterations in sucrose synthase expression and carbon partitioning in developing seeds
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A fiberless seed mutation in cotton is associated with lack of fiber cell initiation in ovule epidermis and alterations in sucrose synthase expression and carbon partitioning in developing seeds

机译：棉花中无纤维的种子突变与胚珠表皮中缺乏纤维细胞起始以及发育中的种子中蔗糖合酶表达和碳分配的改变有关

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摘要

Fibre cell initiation in the epidermal cells of cotton (Gossypium hirsutum) ovules represents a unique example of trichome development in higher plants. Little is known about the molecular and metabolic mechanisms controlling this process. A fibreless seed (fls) mutant (lacking fibres) and a normal (FLS) mutant were studied to better understand the initial cytological events in fibre development and to analyse the metabolic changes that are associated with the loss of a major sink for sucrose during cellulose biosynthesis in the mutant seeds. On the day of anthesis (0 DAA), the mutant ovular epidermal cells lacked the typical bud-like projections that were seen in FLS ovules and are required for commitment to the fibre development pathway. Cell-specific gene expression analyses at 0 DAA showed that sucrose synthase (SuSy) RNA and protein were undetectable in fls ovules but were in abundant, steady-state levels in initiating fibre cells of the FLS ovules. Tissue-level analyses of developing seeds15 to 35 DAA revealed an altered temporal pattern of SuSy expression in the mutant relative to the normal genotype. Whether the altered programming of SuSy expression is the cause or the result of the mutation is unknown. The developing seeds of the flsmutant also showed several correlated changes that represent altered carbon partitioning in seed coats and cotyledons as compared with the FLS genotype.
机译：棉花（陆地棉）胚珠的表皮细胞中的纤维细胞起始代表了高等植物中毛状体发育的独特实例。关于控制该过程的分子和代谢机制知之甚少。研究了无纤维种子（fls）突变体（缺乏纤维）和正常（FLS）突变体，以更好地理解纤维发育过程中的初始细胞学事件，并分析与纤维素期间蔗糖的主要库丢失有关的代谢变化。突变种子的生物合成。在开花的当天（0 DAA），突变的卵子表皮细胞缺少在FLS胚珠中看到的典型的芽状突起，并且是参与纤维发育途径所必需的。在0 DAA时进行的细胞特异性基因表达分析表明，蔗糖合酶（SuSy）RNA和蛋白质在fls胚珠中未检出，但在FLS胚珠的起始纤维细胞中处于丰富的稳态水平。对发育中的种子15至35 DAA的组织水平分析显示，相对于正常基因型，突变体中SuSy表达的时间模式发生了变化。 SuSy表达的编程改变是突变的原因还是结果尚不清楚。与FLS基因型相比，正在发育的flsmutant种子还显示出一些相关变化，这些变化代表种皮和子叶中碳分配的改变。

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