Einige Bemerkungen zu einer internationalen Nomenklatur derPhytophthora-Rassen und der diePhytophthora-Widerstandsfähigkeit kontrollierenden Gene der Kartoffel

Schick, R.; Schick, E.; Hank, H.

doi:10.1007/bf00711726

Cited by 4 publications

(1 citation statement)

References 3 publications

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“…140 years after the first outbreak of Pbytophtbora infestans this disease is still a problem in potato growing, as the fungus develops new races quicker than man can breed resistant cultivars. (SCHICK et al 1954, WRIEDT 1955, die auch heute noch neben dem gleichzeitig von BLACK, MASTENBROEK, MILLS und PETERSON (1953) vorgestellten Sortirnent verwendet werden.…”

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Phytophthora infestans (Mont.) de Bary — eine ständige Herausforderung seit 140 Jahren

Schöber¹

1987

Berichte der Deutschen Botanischen Gesellschaft

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Phytophthora infestans (Mont.) de Bary — eine ständige Herausforderung seit 140 Jahren

Schöber¹

1987

Berichte der Deutschen Botanischen Gesellschaft

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Versuche zur Kultur verschiedener Rassen von phytophthora infestans (Mont.) de By. auf künstlichen Nährböden

Henniger

1959

Journal of Phytopathology

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Differentiation in Phytophthora infestans II. Somatic recombination in vegetative mycelium

Denward

2009

Hereditas

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Mutation from single to double pathogenicity in races 1, 3 and 4 of Phytophthora infestans was studied. Transfer from suboptimal to optimal cultural conditions facilitated the development of pathogenicity 4 in the races 1 and 3 and pathogenicity 3 in race 4. The new pathogenicities functioned for some time independently of the original. The mere presence of two pathogenicities in the same mycelium did not result in pathogenicity on the corresponding double‐R‐genotype. The reasons for this and for the finally developing ability for the P‐genes to interact and attack double resisters of the potato is discussed. It is concluded that the R‐genes of the potato interact to produce a specific substance impossible for the single P‐genes to overcome when separate. The results support the hypothesis that the P‐genes are allelic and that interallelic recombination results in the creation of a new allele causing pathogenicity on corresponding combined R‐genotypes. This hypothesis is tentative in the absence of fundamental facts regarding the nuclear cycle of Phytophthora. Recombination of pathogenicities was studied after mixed infection with pairwise combinations of the races 1, 3 and 4. Out of those 1+3 and 1+4 yielded race 1234 while 3+4 only resulted in race 34. Race 1 on one hand and races 3 and 4 on the other are supposed to carry different parts of a P2 structure. The results indicate noncomplementation within the nucleus. Interallelic recombination is therefore supposed to yield a complete P2 in combination with P1 and P3 or P4 plus the mutated P4 and P3 respectively. The possible occurrence and action of an extranuclear structure, temporarily selfreplicating and distributing in vast sectors of the mycelium, can not for the present be neglected.

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Einige Bemerkungen zu einer internationalen Nomenklatur derPhytophthora-Rassen und der diePhytophthora-Widerstandsfähigkeit kontrollierenden Gene der Kartoffel

Cited by 4 publications

References 3 publications

Phytophthora infestans (Mont.) de Bary — eine ständige Herausforderung seit 140 Jahren

Phytophthora infestans (Mont.) de Bary — eine ständige Herausforderung seit 140 Jahren

Versuche zur Kultur verschiedener Rassen von phytophthora infestans (Mont.) de By. auf künstlichen Nährböden

Differentiation in Phytophthora infestans II. Somatic recombination in vegetative mycelium

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