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Plant disease resistance

About: Plant disease resistance is a research topic. Over the lifetime, 12952 publications have been published within this topic receiving 381820 citations. The topic is also known as: plant innate immunity.


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Journal ArticleDOI
TL;DR: The expression of a novel defence-related gene from tomato which responds rapidly to wound- and pathogen-related signals has been characterised and several lines of evidence suggest that elevated salicylic acid is not a causal signal in planta during either the wound or pathogen resistance response.
Abstract: The expression of a novel defence-related gene from tomato which responds rapidly to wound- and pathogen-related signals has been characterised. The gene, which encodes a protein with homology to glucosyl transferase enzymes, is expressed within 15 min of mechanical damage to tomato leaves, and responds to signals which differ from those on the systemin/jasmonic acid pathway typical of well-characterised wound-induced genes of tomato. Furthermore, expression of the gene is also rapidly and specifically induced during a resistance response elicited by the application of Avr9 avirulence peptide to tomato plants carrying the corresponding Cf9 resistance gene. Whilst expression can also be induced by the application of exogenous salicylic acid and related analogues to tomato plants, several lines of evidence suggest that elevated salicylic acid is not a causal signal in planta during either the wound or pathogen resistance response.

103 citations

Journal ArticleDOI
TL;DR: Resistance gene Rpg4 therefore may account in part for the resistance of soybean to Pseudomonas syringae pv tomato and other pathogens harboring avrD.
Abstract: Soybean [Glycine max (L.) Merr.] cultivars Flambeau and Merit differed in their resistance to Pseudomonas syringae pv glycinea (Psg) race 4, carrying each of four different avirulence (avr) genes cloned from Psg or the related bacterium, Pseudomonas syringae pv tomato. Segregation data for F2 and F3 progeny of Flambeau x Merit crosses indicated that single dominant and nonallelic genes account for resistance to Psg race 4, carrying avirulence genes avrA, avrB, avrC, or avrD. Segregants were also recovered that carried all four or none of the disease resistance genes. One of the disease resistance genes (Rpg1, complementing bacterial avirulence gene B) had been described previously, but the other three genes — designated Rpg2, Rpg3, and Rpg4 — had not here to fore been defined. Rpg3 and Rpg4 are linked (40.5 ± 3.2 recombination units). Rpg4 complements avrD, cloned from Pseudomonas syringae pv tomato, but a functional copy of this avirulence gene has not thus far been observed in Pseudomonas syringae pv glycinea. Resistance gene Rpg4 therefore may account in part for the resistance of soybean to Pseudomonas syringae pv tomato and other pathogens harboring avrD.

103 citations

Journal ArticleDOI
TL;DR: EDR2 appears to be constitutively transcribed in all tissues and organs and encodes a novel protein, consisting of a putative pleckstrin homology (PH) domain and a steroidogenic acute regulatory protein-related lipid-transfer (START) domain, and contains an N-terminal mitochondrial targeting sequence.
Abstract: We have identified an Arabidopsis mutant that displays enhanced disease resistance (edr2) to the biotrophic powdery mildew pathogen Erysiphe cichoracearum. Inhibition of fungal growth on edr2 mutant leaves occurred at a late stage of the infection process and coincided with formation of necrotic lesions approximately 5 days after inoculation. Double-mutant analysis revealed that edr2-mediated resistance is suppressed by mutations that inhibit salicylic acid (SA)-induced defense signaling, including npr1, pad4 and sid2, demonstrating that edr2-mediated disease resistance is dependent on SA. However, edr2 showed normal responses to the bacterial pathogen Pseudomonas syringae pv. tomato strain DC3000. EDR2 appears to be constitutively transcribed in all tissues and organs and encodes a novel protein, consisting of a putative pleckstrin homology (PH) domain and a steroidogenic acute regulatory protein-related lipid-transfer (START) domain, and contains an N-terminal mitochondrial targeting sequence. The PH and START domains are implicated in lipid binding, suggesting that EDR2 may provide a link between lipid signaling and activation of programmed cell death mediated by mitochondria.

103 citations

Journal ArticleDOI
TL;DR: Inheritance of stripe rust resistance in 13 wheat cultivars used to differentiate races of Puccinia striiformis in North America was determined using nine North American races of the pathogen.
Abstract: Inheritance of stripe rust resistance in 13 wheat (Triticum aestivum) cultivars used to differentiate races of Puccinia striiformis in North America was determined using nine North American races of the pathogen. The differential cultivars, which were resistant to specific races, were crossed with cultivars susceptible to the specific races. We found that Lemhi, Chinese 166, Riebesel 47/51, and Tyee each have a single resistance gene; Heines VII, Moro, Druchamp, Produra, Stephens, Lee, and Fielder each have two resistance genes; and Paha and Yamhill each have three resistance genes (...)

103 citations

Journal ArticleDOI
TL;DR: The genetics of seedling resistance to leaf rust was investigated in what (Triticum aestivum L.) introductions PI 268454, PI 58548 and PI 268316, originally collected in Afghanistan, China and Iran, respectively.
Abstract: The genetics of seedling resistance to leaf rust (Puccinia recondita Rob ex Desm) was investigated in what (Triticum aestivum L) introductions PI 268454, PI 58548 and PI 268316, originally collected in Afghanistan, China and Iran, respectively PI 268454 was heterogeneous for resistance A selection (PI 268454a) has a gene that confers a 1+ reaction while a second selection (PI 268454b) probably has resistance gene Lr2b PI 58548 has two genes for resistance, one giving a 1+ reaction and the second a 2+ These two genes interact to produce a; 1 reaction PI 268316 has three interacting genes, one giving a 1+ reaction, the second a 2+ and a third resistance gene similar to LrB The gene giving the 1+ reaction was common to all three introductions PI 58548 and PI 268316 carry different genes for infection type 2+ Backcross lines of the single genes were produced Implications to breeding for disease resistance of genes interacting to produce different phenotype are discussed

103 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
2023377
2022756
2021410
2020438
2019526
2018640