Some ultrastructural features of the vesicular-arbuscular mycorrhiza in the grapevine
DOI:
https://doi.org/10.5073/vitis.1978.17.386-395Abstract
A morphological analysis using transmission and scanning electron microscopy was carried out about the mycorrhizal roots of grapevine, grown in the field. Only the most common features of the endophyte, i.e. intercellular hyphae and arbuscules, were studied. The intercellular hyphae spreading the infection showed a protoplasm endowed with nuclei, mitochondria, vacuoles with dense globules and bacteria-like microorganisms. After the penetration inside the host cell, many fungal branches were found. The so formed arbuscule filled up the whole cortical cell. The different stages of the arbuscular deterioration were observed and described. The infected host cell showed beyond the usual organelles plastids with starch in close contact with the endophyte.
Quelques caractéristiques ultrastructurelles des mycorrhizes du type vésiculaire
arbusculaire de la vigne
On a étudié au moyen de microscopes electroniques à transmission et à balayage la morphologie de racines mycorrhizées prélevées dans les vignobles. L'attention a été concentrée sur les formes les plus répandues de l'endophyte, c'est-à-dire les hyphes intercellulaires et les arbuscules. Les hyphes intercellulaires, qui transmettent l'infection, ont un protoplasme muni de noyaux, de mitochondries, de vacuoles avec des globules sombres aux électrons et des micro-organismes semblables à des bactéries.
A la suite de la pénétration dans la cellule de la plante-hôte, l'hyphe forme plusieures branches. L'arbuscule ainsi formé remplit complètement la cellule corticale. On a pu observer et décrire les différentes phases de dégradation de l'arbuscule. Les cellules de l'hôte infectées montrent outre les organelles normales des plastides avec de l'amidon en contact étmit avec l'endophyte.
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