Inheritance of resistance to Phytophthora infestans in two diploid Mexican solanum species

Euphytica ◽  
1963 ◽  
Vol 12 (1) ◽  
pp. 35-40 ◽  
Author(s):  
K. M. Graham
Keyword(s):  
Phytophthora Infestans ◽  
Solanum Species ◽  
Inheritance Of Resistance

scholarly journals The presence of Phytophthora infestans in the rhizosphere of a wild Solanum species may contribute to off-season survival and pathogenicity

2020 ◽  
Vol 148 ◽  
pp. 103475 ◽  
Author(s):  
Ramesh R. Vetukuri ◽  
Laura Masini ◽  
Rebecca McDougal ◽  
Preeti Panda ◽  
Levine de Zinger ◽  
...  
Keyword(s):  
Phytophthora Infestans ◽  
Solanum Species ◽  
Wild Solanum Species ◽  
Wild Solanum

IV.—Inheritance of Resistance to Two Strains of Blight (Phytophthora infestans de Bary) in Potatoes

1944 ◽  
Vol 61 (1) ◽  
pp. 137-147 ◽  
Author(s):  
William Black
Keyword(s):  
Disease Resistance ◽  
Plant Breeding ◽  
Phytophthora Infestans ◽  
Inheritance Of Resistance ◽  
Breeding Work ◽  
Resistant Species ◽  
Breeding Station ◽  
In The Wild ◽  
Plant Breeding Station

The existence in Mexico of blight-resistant species of potato has been known for many years, but they occur in the wild and are quite unsuitable for agricultural purposes. In order to utilise their resistance to disease it is necessary to combine disease resistance with the cropping qualities of cultivated forms while eliminating the undesirable characters which are prominent in the wild forms. Breeding work with this object in view has been in progress at the Scottish Plant Breeding Station for several years, and results obtained in the course of testing progenies for reaction to blight infection are discussed in the following pages.

scholarly journals Fungal Sensitivity to and Enzymatic Degradation of the Phytoanticipin α-Tomatine

1998 ◽  
Vol 88 (2) ◽  
pp. 137-143 ◽  
Author(s):  
Robert W. Sandrock ◽  
Hans D. VanEtten
Keyword(s):  
Phytophthora Infestans ◽  
Effective Dose ◽  
Verticillium Dahliae ◽  
Strong Correlation ◽  
Fungal Pathogens ◽  
Enzymatic Degradation ◽  
Degradation Products ◽  
Solanum Species ◽  
Tolerance Mechanisms ◽  
Multiple Tolerance

α-Tomatine, synthesized by Lycopersicon and some Solanum species, is toxic to a broad range of fungi, presumably because it binds to 3β-hydroxy sterols in fungal membranes. Several fungal pathogens of tomato have previously been shown to be tolerant of this glycoalkaloid and to possess enzymes thought to be involved in its detoxification. In the current study, 23 fungal strains were examined for their ability to degrade α-tomatine and for their sensitivity to this compound and two breakdown products, β2-tomatine and tomatidine. Both saprophytes and all five non-pathogens of tomato tested were sensitive, while all but two tomato pathogens (Stemphylium solani and Verticillium dahliae) were tolerant of α-to-matine (50% effective dose > 300 μM). Except for an isolate of Botrytis cinerea isolated from grape, no degradation products were detected when saprophytes and nonpathogens were grown in the presence of α-tomatine. All tomato pathogens except Phytophthora infestans and Pythium aphani-dermatum degraded α-tomatine. There was a strong correlation between tolerance to α-tomatine, the ability to degrade this compound, and pathogenicity on tomato. However, while β2-tomatine and tomatidine were less toxic to most tomato pathogens, these breakdown products were inhibitory to some of the saprophytes and nonpathogens of tomato, suggesting that tomato pathogens may have multiple tolerance mechanisms to α-tomatine.

XVII.—Inheritance of Resistance to Blight (Phytophthora infestans) in Potatoes: Inter-Relationships of Genes and Strains

1951 ◽  
Vol 64 (3) ◽  
pp. 312-352 ◽  
Author(s):  
William Black
Keyword(s):  
Disease Resistance ◽  
Phytophthora Infestans ◽  
Hypersensitive Response ◽  
Environmental Conditions ◽  
Wild Species ◽  
Major Gene ◽  
Phenotypic Expression ◽  
Inheritance Of Resistance ◽  
Different Types ◽  
The Common

SynopsisThe common strain and six specialised strains of Phytophthora infestans have been employed in testing potato varieties and seedling progenies bred from the wild species S. demissum for resistance to the disease. Resistance, due to the hypersensitive condition of the protoplasm, is manifested in the presence of major genes, and four such genes have been identified, viz. R1, R2, R3 and R4. Each gene induces in the plant a hypersensitive response to infection with the common strain and with a particular group of specialised strains of the parasite. The genes are inherited independently in simple Mendelian fashion, but in the segregations three different types of deviations from standard disomic ratios occur due to (a) unpaired chromosomes, (b) incompatibility factors, and (c) partial autosyndesis. A series of minor genes modify the phenotypic expression of the major gene system and so differentiate grades of hypersensitivity or of susceptibility as the case may be.The common strain of P. infestans appears to be a population persisting at an equilibrium determined by host range and environmental conditions. Mutations frequently occur, but new forms survive only when host genotypes, to which they are specially adapted, are available.

scholarly journals First Report of Phytophthora infestans A2 Mating Type in Ecuador

Plant Disease ◽  
1997 ◽  
Vol 81 (3) ◽  
pp. 311-311 ◽  
Author(s):  
P. J. Oyarzun ◽  
M. E. Ordoñes ◽  
G. A. Forbes ◽  
W. E. Fry
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Mating Type ◽  
Solanum Species ◽  
Systematic Sampling ◽  
Transitional Area ◽  
Wild Solanum Species ◽  
Commercial Potato ◽  
Important Field ◽  
Andean Highlands

The tropical highlands of Ecuador are a genetic center for several Solanaceous species, including potato. In 1995 and 1996, severe late blight epidemics occurred in wild Solanum species, e.g., Solanum brevifolium, growing in the transitional area between the highlands and the coastal tropical lowlands near the city of Quito. Sixteen isolates of Phytophthora infestans were collected in 1995 and 36 isolates in 1996. Of these, three from 1995 and four from 1996 were A2 mating type. Extensive and systematic sampling of commercial potato and tomato in Ecuador have failed to reveal the presence of the A2 mating type (G. A. Forbes, X. M. Escobar, C. C. Ayala, J. Revelo, M. E. Ordoñez, B. A. Fry, K. Doucet, and W. E. Fry, Phytopathology, in press.). Apparently the A2 mating type reported for the first time in Ecuador is only associated with wild Solanaceous spp. Further research is required to determine the consequences of this event for management of late blight in both potato and tomato, two important field crops in the Andean highlands.

Changes in the antioxidant status in leaves of Solanum species in response to elicitor from Phytophthora infestans

2007 ◽  
Vol 164 (10) ◽  
pp. 1268-1277 ◽  
Author(s):  
Lidia Polkowska-Kowalczyk ◽  
Bernard Wielgat ◽  
Urszula Maciejewska
Keyword(s):  
Phytophthora Infestans ◽  
Antioxidant Status ◽  
Solanum Species
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