当前位置: X-MOL 学术Flora › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Haustorial structure of the holoparasitic angiosperm Cynomorium coccineum L. invading host roots
Flora ( IF 1.9 ) Pub Date : 2021-01-01 , DOI: 10.1016/j.flora.2020.151731
Gamal M. Fahmy , Abdelrahman H. Hassan

Absract The perennial angiosperm holoparasite Cynomorium coccineum L. (Cynomoriaceae) was found infecting the roots of halophytes in a Mediterranean coastal salt marsh. The parasite consists of a subterranean rhizome, which carries haustoria and sends aboveground annual inflorescences. Although the published research on the botany and taxonomy of C. coccineum dates back to approximately 150 years ago (Weddell, 1860; Engler, 1889; Baccarini and Cannarella, 1899), it lacked sufficient information on the anatomy of the haustorium parasitizing the host roots. Here, we described for the first time, the anatomy and ultrastructure of the haustoria of C. coccineum infecting host roots. The hosts recorded in this study were Limonium narbonense Mill. (Plumbaginaceae) and Atriplex portulacoides L. (Chenopodiaceae). The anatomy of haustoria was investigated by light microscopy, by histochemical techniques to stain lignin and callose and by scanning and transmission electron microscopy. The invasion of the host root by the haustoria of C. coccineum is largely accomplished via mechanical pressure. The presence of sieve tube elements in the haustorium at the interface between the phloem of the host roots and the parasite, was detected by light microscopy. The sieve element plastids of the host H. portulacoides are of the P-type, which is characteristic of Chenopodiaceae. The sieve elements in the haustorium are either differentiating or mature; the formers have thick undulating walls, disintegrated protoplast, and callose occluded sieve plate pores. The mature ones have fibrillar nacreous walls, clear lumen and fine sieve plate pores occluded with non-callose material. Sieve element plastids and P-protein bodies were not observed in the phloem of the haustorium. Plasmodesmatal connections are lacking at the contacts between the host and the parasite. The contacts between the tracheary elements of H. portulacoides and the parasite occur by the abutments of through cell walls, pit, or parenchyma cells.

中文翻译:

全寄生被子植物锁阳(Cynomorium coccineum L.)侵入宿主根部的Haustorial结构

摘要 多年生被子植物全寄生物 Cynomorium coccineum L. (Cynomoriaceae) 被发现感染地中海沿海盐沼中的盐生植物根。寄生虫由地下根茎组成,其携带吸器并发送地上一年生花序。尽管已发表的关于球虫的植物学和分类学研究可以追溯到大约 150 年前(Weddell,1860;Engler,1889;Baccarini 和 Cannarella,1899),但它缺乏关于寄生于宿主根的吸器的解剖结构的足够信息. 在这里,我们首次描述了 C. coccineum 感染宿主根的吸器的解剖结构和超微结构。本研究中记录的寄主是 Limonium narbonense Mill。(Plumbaginaceae) 和 Atriplex portulacoides L. (藜科)。通过光学显微镜、组织化学技术对木质素和胼胝质染色以及通过扫描和透射电子显微镜研究吸器的解剖结构。C. coccineum 吸器对宿主根的侵入主要是通过机械压力完成的。通过光学显微镜检测在宿主根韧皮部和寄生虫之间的界面处吸器中存在筛管元件。寄主马齿苋的筛分质体为 P 型,这是藜科的特征。吸器中的筛分元件要么分化,要么成熟;前者壁厚起伏,原生质体解体,筛板孔胼胝闭塞。成熟的有纤维状的珍珠质壁,清晰的管腔和细小的筛板孔被非胼胝质材料闭塞。在吸器韧皮部未观察到筛分质体和P蛋白体。宿主和寄生虫之间的接触处缺乏质体连接。H. portulacoides 的气管元件与寄生虫之间的接触发生在贯通细胞壁、凹坑或薄壁细胞的邻接处。
更新日期:2021-01-01
down
wechat
bug