Detection of pea seed-borne mosaic virus virion and pinwheel inclusion body proteins in leaf and seed tissues of pea (Pisum sativum L) by immunogold labelling

Autor: Wang, D., Woods, RD, Swaby, AG, Cockbain, AJ
Zdroj: Agronomy for Sustainable Development; 1991, Vol. 11 Issue: 5 p387-394, 8p
Abstrakt: An immunogold labelling procedure was developed to detect pea seed-borne mosaic virus (PSbMV) virion and pinwheel inclusion body proteins in leaf and seed tissues of pea and to study the cytology of PSbMV infection in this host. Ultrathin sections were treated with immunoglobulin prepared against either PSbMV particles or PSbMV pinwheel inclusion bodies. The sections were then probed with gold-labelled goat antirabbit immunoglobulin. With immunoglobulin against PSbMV particles, virus particles, but not pinwheel and crystalline inclusions, were specifically labelled. With immunoglobulin against pinwheel inclusion bodies, pinwheel inclusion bodies (bundles and scrolls) were specifically labelled, but neither PSbMV particles nor its crystalline inclusion bodies were labelled, showing that the crystalline inclusion body protein was unrelated to either virus coat protein or the pinwheel inclusion protein. When cotyledon and plumule sections cut from fixed seed tissues were treated with the 2 types of immunoglobulin, only PSbMV particle bundles were labelled, indicating that in seed tissues, the pinwheel inclusion was structurally different from that in leaf tissues. D?tection du virion de la mosa?que du pois et des prot?ines d'inclusions cytoplasmiques dans les feuilles et les grains de pois (Pisum sativum L) par immuno-marquage ? l'or. Un immuno-marquage ? l'or collo?dal a ?t? optimis? pour la d?tection in situ du virus et des inclusions cytoplasmiques (CCI) dans les tissus foliaires et les grains de pois infect?s par le pea seed-borne mosaic virus (PSbMV) (figs 1, 2, 3, tableau I). Des coupes ultrafines de tissu ont ?t? incub?es en pr?sence d'anticorps de lapin pr?par?s soit contre le virus, soit contre les CCI, puis ont ?t? trait?es par des anticorps de ch?vre anti-lapin coupl?s ? des billes d'or collo?dal. Avec le s?rum anti virus, seules les particles virales ont ?t? d?cor?es, les CCI et les inclusions cristallines ne pr?sentant aucun marquage (fig 4). Avec le s?rum anti-CCI, les inclusions cytoplasmiques cylindriques ont ?t? marqu?es alors que le virus et les inclusions cristallines n'ont pas ?t? reconnus (figs 5, 6). Ces r?sultats montrent que les inclusions cristallines ne sont s?rologiquement reli?es ni au virus ni aux CCI. Quand des coupes de cotyl?don ou de gemmule r?alis?es ? partir de graines pr?alablement fix?es ont ?t? trait?es avec ces 2 anticorps, seuls les amas de particules virales ont ?t? d?cor?s indiquant une diff?rence de structure entre les CCI form?es dans les feuilles et celles form?es dans les graines (fig 7).
Databáze: Supplemental Index