Development of a method for phenotyping Black Rot (Guignardia bidwellii) resistance on grapevine (Vitis spp.)

Rex, Friederike; Fechter, Iris; Hausmann, Ludger; Töpfer, Reinhard

doi:10.1038/npre.2011.5743

Cited by 1 publication

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“…However, in the northeast USA, it poses major problems even in conventional viticulture. Although the degree of susceptibility to Black Rot differs among grape varieties to some extent (Loskill et al 2010;Rex 2012), all commercially important cultivars are susceptible to this disease. However, certain genotypes of the European wild grapevine (V. vinifera subsp.…”

Section: Introductionmentioning

confidence: 99%

Searching new targets for the control of Black Rot: following the role of host factors modulating the infection process of Phyllosticta ampelicida

Tisch,

Kortekamp,

Nick

2024

Plant Biol J

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Black Rot is a grapevine disease caused by the ascomycete Phyllosticta ampelicida. Neglected so far, this is developing into a pertinent problem in organic viticulture as resistant varieties are still lacking. Here, we follow cellular details of the infection process in the susceptible vinifera variety Müller‐Thurgau and screen the ancestral European wild grapevine (V. vinifera sylvestris) for resistance to Black Rot. Using a standardized infection assay, we follow fungal development using LTSEM and quantify key stages on different hosts using fluorescence microscopy. There is considerable variation in susceptibility, which is associated with more rapid leaf maturation. Hyphal growth on different carbon sources shows a preference for pectins over starch, cellulose or xylans. In the resistant sylvestris genotypes Ketsch 16 and Ketsch 18 we find that neither spore attachment nor appressorium formation, but hyphal elongation is significantly inhibited as compared to Müller‐Thurgau. Moreover, defence‐related oxidative burst and accumulation of phenolic compounds is stimulated in the resistant genotypes. We arrive at a model, where more rapid maturation of the cell wall in these sylvestris genotypes sequesters pectins as major food source and thus block hyphal elongation. This paves the way for introgression of genetic factors responsible for cell wall maturation into V. vinifera to develop Black Rot‐resistant varieties of grapevine.

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Section: Introductionmentioning

confidence: 99%