Assessment of the field resistance of potato genotypes with major gene resistance to late blight (Phytophthora infestans (Mont.) de Bary) using inoculum comprised of two complementary races of the fungus

2001 ◽  
Vol 44 (1) ◽  
pp. 41-52 ◽  
Author(s):  
Helen E. Stewart ◽  
J. E. Brandshaw
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Major Gene ◽  
Field Resistance ◽  
Major Gene Resistance

STUDIES ON FERTILITY AND LATE BLIGHT RESISTANCE IN SOLANUM BULBOCASTANUM DUN. IN MEXICO

1959 ◽  
Vol 37 (1) ◽  
pp. 41-49 ◽  
Author(s):  
K. M. Graham ◽  
J. S. Niederhauser ◽  
Leopoldo Servin
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Late Blight Resistance ◽  
Field Resistance ◽  
Blight Resistance ◽  
Solanum Bulbocastanum ◽  
Mexican Isolate

Solanum balbocastanum Dun. was collected extensively throughout its range in Mexico and Guatemala. Experimental self- and cross-pollinations showed that the species is highly self-sterile and consists of cross-sterile and cross-fertile individuals. Self-sterility may be due to the presence of incompatibility factors or to triploidy. Authentic hybrids were produced between S. bulbocastanum and S. trifidum Correll, and between S. bulbocastanum and S. pinnatisectum Dun.After inoculation with race 1.2.3.4 of Phytophthora infestans three types of reaction were observed among 1148 seedlings of S. bulbocastanum: immunity with no perceptible lesions, resistance expressed by non-sporulating lesions of the hypersensitive type, and susceptibility indicated by large sporulating necrotic lesions. Seedlings resistant to an isolate of race 1.2.3.4 of Canadian origin did not always show the same level of resistance to a Mexican isolate of the same race. Varying degrees of field resistance were observed among seedling plants, while tuber-propagated plants were generally field immune. Solanum bulbocastanum is considered a mixture of resistant and susceptible genotypes.

scholarly journals Field Evaluation of Potato Resistance Against Phytophthora Infestans under Natural Infection Pressure

2017 ◽  
Vol 76 (1) ◽  
pp. 25-28
Author(s):  
Jarosław Plich ◽  
Beata Tatarowska
Keyword(s):  
Late Blight ◽  
Phytophthora Infestans ◽  
Potato Breeding ◽  
Natural Infection ◽  
Field Evaluation ◽  
Field Resistance ◽  
Field Conditions ◽  
Breeding Programs ◽  
Infection Pressure ◽  
Potato Resistance

Abstract Although development of potato cultivars resistant to late blight has long been one of the primary goals of potato breeding programs, several different methods of field resistance evaluation have been used by potato breeders. Recently, within the EucaBlight network (www.euroblight.net), common methods of late blight evaluation have been agreed on, and these methods are currently highly recommended for use by all those interested in evaluating the resistance of the potato to late blight. Here, we describe a method of evaluating potato resistance in field conditions routinely used at Młochów Research Center, which is compliant with recommendations of the EucaBlight protocol.

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