Trichomes are hair-like structures derived from plant epidermal cells. Trichomes exist in most plant species and are categorized as either glandular or non-glandular. Glandular trichomes function as chemical protection against herbivores, while non-glandular trichomes serve as physical barriers to various biotic and environmental stresses. Here, we describe a novel recessive mutation named hairless on stems ( host ) which was identified based on the absence of trichomes on stems. host plants exhibited lower density of trichomes on leaves, stems, and hypocotyls, compared with the wild-type (WT) plants. Types I, III, and V trichomes, especially, were not developed at all on the stems of the host plants. In addition to trichome initiation, the length of Type I trichomes was shorter in the host plants than in the WT plants. The growth of host plants under greenhouse conditions showed that the mutant has shorter stems and fewer leaves than the WT plants. Genetic mapping of the host locus using the map-based cloning approach positioned the locus within 4.4 cM interval flanked by markers, Solyc09g074280 and Solyc09g075360, on chromosome 9. The identification of the Host gene will provide a clue for understanding multicellular trichome development in tomato and the Host gene can be used as a useful genetic resource to develop insect-resistant tomato.

中文翻译：

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番茄无毛茎突变体影响毛状体发育

毛状体是源自植物表皮细胞的毛发状结构。毛状体存在于大多数植物物种中，可分为腺体或非腺体。腺毛状体起到针对食草动物的化学保护作用，而非腺体毛状体则作为各种生物和环境压力的物理屏障。在这里，我们描述了一种新的隐性突变，称为茎（宿主）上的无毛，它是根据茎上没有毛状体而确定的。与野生型 (WT) 植物相比，宿主植物的叶、茎和下胚轴上的毛状体密度较低。尤其是 I、III 和 V 型毛状体在寄主植物的茎上根本不发育。除了毛状体起始，宿主植物中 I 型毛状体的长度比 WT 植物中的短。宿主植物在温室条件下的生长表明，突变体比 WT 植物具有更短的茎和更少的叶子。使用基于图谱的克隆方法对宿主基因座进行遗传定位，将基因座定位在 4.4 cM 间隔内，两侧是 9 号染色体上的标记 Solyc09g074280 和 Solyc09g075360。宿主基因的鉴定将为了解番茄和多细胞毛状体发育提供线索。宿主基因可作为开发抗虫番茄的有用遗传资源。