Apparent Localization of Fusarium Wilt Resistance in the Pan America Tomato

Heinze, Peter; Andrus, C. F.

doi:10.1002/j.1537-2197.1945.tb05087.x

Cited by 16 publications

(4 citation statements)

References 5 publications

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“…The interesting grafting experiments of May (1930) and of Heinze and Andrus (1945) may be interpreted on the basis of this information. Heinze and Andrus grafted large numbers of highly susceptible Bonny Best shoots on stocks of the relatively resistant Pan America, and shoots of the relatively resistant Pan America on stocks of the highly susceptible Bonny Best variety.…”

Section: Resistance Of Host To Parasite and To Its Toxinmentioning

confidence: 79%

Some Problems of Pathological wilting in Plants

Gäumann¹

1951

Advances in Enzymology - And Related Areas of Molecular Biology

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Section: Resistance Of Host To Parasite and To Its Toxinmentioning

confidence: 79%

Some Problems of Pathological wilting in Plants

Gäumann¹

1951

Advances in Enzymology - And Related Areas of Molecular Biology

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“…I-1 rootstocks protect the scion of a grafted susceptible variety against Fusarium wilt, implying that Fusarium resistance is root-based ( Heinze and Andrus, 1945 ). There are contrasting views on how resistant plants constrain Fol pathogenicity.…”

Section: Introductionmentioning

confidence: 99%

“…Based on the expression pattern of the I -genes in root tissues and the grafting experiments, resistance to Fol appears to be primarily root-based ( Heinze and Andrus, 1945 ; Kajala et al., 2021 ). Yet, it is unclear what mechanism restricts the fungus in the xylem vessel of the stem and prevents colonization of vasculature adjacent tissues.…”

Section: Introductionmentioning

confidence: 99%

Tomato R-gene-mediated resistance against Fusarium wilt originates in roots and extends to shoots via xylem to limit pathogen colonization

Šimkovicová,

Kramer,

Rep

et al. 2024

Front. Plant Sci.

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Vascular wilt disease, caused by the soil-borne fungus Fusarium oxysporum (Fo), poses a threat to many crop species. Four different tomato resistance (R) genes (I-1, I-2, I-3, and I-7) have been identified to confer protection against Fo f.sp. lycopersici (Fol). These I genes are root-expressed and mount an immune response upon perception of the invading fungus. Despite immune activation, Fol is still able to colonize the xylem vessels of resistant tomato lines. Yet, the fungus remains localized in the vessels and does not colonize adjacent tissues or cause disease. The molecular mechanism constraining Fol in the vascular system of the stem remains unclear. We here demonstrate that an I-2-resistant rootstock protects a susceptible scion from Fusarium wilt, notwithstanding fungal colonization of the susceptible scion. Proteomic analyses revealed the presence of fungal effectors in the xylem sap of infected plants, showing that the lack of fungal pathogenicity is not due to its inability to express its virulence genes. To identify mobile root-derived proteins, potentially involved in controlling fungal proliferation, comparative xylem sap proteomics was performed. We identified distinct pathogenesis-related (PR) protein profiles in xylem sap from Fol-inoculated I-1, I-2, I-3, and I-7 resistant lines. Despite structural diversity, all four immune receptors trigger the accumulation of a common set of four PR proteins: PR-5x, PR-P2, and two glucan endo-1,3-β-D-glucosidases. This research provides insights into Fusarium resistance mechanisms and identifies a core set of proteins whose abundance correlates with defense against Fusarium wilt.

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“…The presence of soil, complexity, and confounding effects of other rhizosphere microbiota, and the need to use invasive or destructive measures to access infected tissues make investigations of root-infecting pathogens difficult. Consequently, the bulk of research has focused on foliar pathogens that cause local lesions and invoke typical plant defense responses involving reactive oxygen species (ROS), the release of Ca 2+ , and rapid host cell death known as the hypersensitive response (HR) ( Heinze and Andrus, 1945 ; Levine et al , 1994 ; Lamb and Dixon, 1997 ; Morel and Dangl, 1997 ). These studies led to the concept of two layers of plant defense first proposed in the zig–zag model of Jones and Dangl (2006) .…”

Section: Introductionmentioning

confidence: 99%

Tissues and mechanisms associated with Verticillium wilt resistance in tomato using bi-grafted near-isogenic lines

Ingram

Shekasteband

et al. 2023

Journal of Experimental Botany

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Summary Host resistance is the primary means to control Verticillium dahliae, a soil-borne pathogen causing major losses on a broad range of plants, including tomato. The tissues and mechanisms responsible for resistance remain obscure. In the field, resistant tomato used as rootstocks does not confer resistance. Here, we created bi-grafted plants with near-isogenic lines (NILs) exhibiting (Ve1) or lacking (ve1) resistance to V. dahliae race 1. Ten days after inoculation, scion and rootstock tissues were subjected to differential gene expression and co-expression network analyses. Symptoms only developed in susceptible scions regardless of the rootstock. Infection caused more dramatic alteration of tomato gene expression in susceptible compared to resistant tissues, including pathogen receptor, signaling pathway, PR protein, and cell wall modification genes. Differences were observed between scions and rootstocks, primarily related to physiological processes in these tissues. Gene expression in scions was influenced by the rootstock genotype. A few genes were associated with the Ve1 genotype, which was independent of infection or tissue type. Several were physically clustered, some near the Ve1 locus on chromosome 9. Transcripts mapped to V. dahliae were dominated by secreted candidate effector proteins. These findings advance knowledge of molecular mechanisms underlying the tomato–V. dahliae interaction.

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Apparent Localization of Fusarium Wilt Resistance in the Pan America Tomato

Cited by 16 publications

References 5 publications

Some Problems of Pathological wilting in Plants

Some Problems of Pathological wilting in Plants

Tomato R-gene-mediated resistance against Fusarium wilt originates in roots and extends to shoots via xylem to limit pathogen colonization

Tissues and mechanisms associated with Verticillium wilt resistance in tomato using bi-grafted near-isogenic lines

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