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首页> 外文期刊>AoB PLANTS >Linear glandular trichomes of Helianthus (Asteraceae): morphology, localization, metabolite activity and occurrence
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Linear glandular trichomes of Helianthus (Asteraceae): morphology, localization, metabolite activity and occurrence

机译：菊科（菊科）的线性腺毛状体：形态，定位，代谢物活性和发生

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Capitate glandular trichomes of sunflower are well investigated, but detailed studies are lacking for the linear glandular trichomes (LGT), a second type of physiologically active plant hair present on the surface of sunflowers. Light, fluorescence and scanning electron microscopy as well as histochemical staining were used to investigate the structure and metabolite deposition of LGT. Consisting of 6–11 linearly arranged cells, LGT were found on the surface of most plant organs of Helianthus annuus. They were associated with the leaf vascular system, and also occurred along petioles, stems and the abaxial surface of chaffy bracts, ray and disc florets. The highest density was found on the abaxial surface of phyllaries. Phenotypically similar LGT were common in all species of the genus, but also occurred in most other genera of the Helianthinae so far screened. Brownish and fluorescent metabolites of an as yet unknown chemical structure, together with terpenoids, were produced and stored in apical cells of LGT. The deposition of compounds gradually progressed from the tip cell to the basal cells of older trichomes. This process was accompanied by nucleus degradation in metabolite-accumulating cells. The localization of these trichomes on prominent plant parts of the apical bud and the capitulum combined with the accumulation of terpenoids and other as yet unknown compounds suggests a chemo-ecological function of the LGT in plant–insect or plant–herbivore interaction.
机译：向日葵的人头腺毛状体已经得到了很好的研究，但是对于线性腺毛状体（LGT）（存在于向日葵表面的第二种具有生理活性的植物毛），尚缺乏详细的研究。使用光，荧光和扫描电子显微镜以及组织化学染色来研究LGT的结构和代谢物沉积。由6-11个线性排列的细胞组成的LGT被发现在大多数向日葵植物器官的表面。它们与叶片血管系统有关，也发生在叶柄，茎和cha片片，射线和盘状小花的背面。在叶的背面发现最高的密度。在表型上相似的LGT在该属的所有物种中都很常见，但在迄今为止筛选出的Helianthinae的大多数其他属中也存在。化学结构未知的褐色和荧光代谢产物与萜类化合物一起产生并储存在LGT的顶端细胞中。化合物的沉积从较老的毛状体的尖端细胞逐渐发展到基底细胞。该过程伴随着代谢物积累细胞中的细胞核降解。这些毛状体在根尖和冠状花序的突出植物部位上的定位，加上萜类化合物和其他尚未知的化合物的积累，表明LGT在植物-昆虫或植物-草食动物相互作用中的化学生态功能。

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