Component analysis of general resistance toPhytophthora infestans in clones from the Colombian potato collection

Nilsson, B.

doi:10.1007/bf02360361

Cited by 18 publications

(7 citation statements)

References 3 publications

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“…In field resistant genotypes of S. andigena, considered to be the ancestor of S. tuberosum [Burton, 1989], and S. phureja, IE, LGR, LP and SC all appeared reduced [Guzmfin-N, 1964]. Nilsson [1981] confirmed that IE and LGR are reduced in resistant genotypes of S. andigena and S. phureja and found that the two components were correlated. However, the real importance of these components in field resistant potato cultivars, reviewed by Van Oijen [1991] is not clear since contradictory data have been reported.…”

Section: Introductionsupporting

confidence: 52%

Durable resistance to late blight (Phytophthora infestans) in old potato cultivars

Colon¹,

Turkensteen²,

Prummel

et al. 1995

Eur J Plant Pathol

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Twenty-two R gene-free cultivars, introduced between 1900 and 1954, were field-tested for their level of partial resistance to a complex race of Phytophthora infestans. Disease assessments, expressed as areas under the disease progress curve, appeared closely correlated to resistance ratings given between 1929 and 1954. This, and the stability in time since 1929 of the ratings in the Dutch Descriptive List of Varieties of Field Crops, suggest that the resistance concerned is durable. Lesion growth rate was found to be a very important component of resistance in these cultivars and also in more recently introduced ones, whereas latent period varied little between the cultivars. The most resistant culfivars were Robijn, Populair, Pimpernel, Libertas and Surprise, which were also among the latest maturing in the material. These five cultivars are closely related and may have the same resistance genes.Abbreviations: ADPC --area under the disease progress curve; LGR = lesion growth rate; LP = latent period.

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Section: Introductionsupporting

confidence: 52%

Durable resistance to late blight (Phytophthora infestans) in old potato cultivars

Colon¹,

Turkensteen²,

Prummel

et al. 1995

Eur J Plant Pathol

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“…Two levels of resistance expression to P. palmivora were observed in cacao leaves. A similar phenomenon was observed in the inheritance of field resistance in potato leaves to Phvtophthont infestans by Nilsson (1981), who found that resistance to infection (infection efficiency of zoospores) and resistance to invasion (lesion area) were not completely separately inherited. However, the present study showed the two resistance traits to be unlinked in T. cacao foliage The method used to estimate locus numbers demonstrated, by its limitations, that the genetic control of these components of resistance was different.…”

Section: Discussionsupporting

confidence: 73%

Estimation of the number of loci involved in the inheritance of resistance to Phytophthora palmivora (Butl.) Butl. in the leaves of Theobroma cacao L.

Warren

Pettitt

1994

Plant Pathology

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Comparisons of theoretical and observed distributions indicated that resistance to necrosis caused by Phytophthora palmivora within leaf tissues of Theobroma cacao clone ICSl was influenced by a minimum of five unlinked heterozygous loci. The frequency of infection at the leaf surface was not linked to necrotic spread and did not adequately fit the expected progeny distributions. It is argued that this lack of fit was possibly the result of gene effects of differing magnitude influencing the observed variation in leaf surface infection rate, although other factors such as epistasis may be important.

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“…Inoculated leaflets were incubated at 16 ± 0.5°C with 12 hr light cycle. On the 7 th day after inoculation, the mean diameter of the lesion on each leaflet was measured as described by Nilsson (1981). The experiment was repeated twice.…”

Section: Detached-leaf Assaymentioning

confidence: 99%

Determination of Resistance to Phytophthora infestans on Potato Plants in Field, Laboratory and Greenhouse Conditions

Sharma¹,

Forbes²,

Manandhar³

et al. 2013

JAS

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An experiment was conducted to determine the host resistance of potato against Phytophthora infestans for twenty-five potato genotypes in 2010 and 2011 at Khumaltar, Lalitpur, Nepal using four assays: three for foliage resistance (field, whole-plant and detached leaf) and one for tuber resistance (tuber slice). An isolate of P. infestans collected from Lalitpur (LPR-1) was used for inoculation at a concentration of 3 x 10 3 sporangia ml -1 in all assays. Infected foliage area in the field and whole-plant assays, lesion size on detached leaves, and colony growth on tuber slice were all individually converted to 0-9 interval scale for susceptibility. Field assessment, considering the most robust measure of resistance, was used as benchmark for comparing the other assays. Sixteen of the genotypes had very little disease in the field (scale value <1) indicating they were probably expressing race-specific resistance, which has historically been short lived. Susceptibility levels measured in the whole-pant assay were highly correlated (r = 0.90) with converted field scale values, although the correlation was lower for the detached leaf assay (r = 0.63) and least for tuber-slice assay (r = 0.46). Low correlation in the detached leaf assay was assumed to represent lower resolution of the single-cycle assay. Low correlation in the tuber assay may have also reflected genetic differences as foliage and tuber blight resistance are not always correlated. Genotypes with extreme resistance in the field were frequently identified as having partial resistance in the other assays, which could mistakenly be interpreted as more durable field resistance. The consequences for selecting durable resistance are discussed.

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Component analysis of general resistance toPhytophthora infestans in clones from the Colombian potato collection

Cited by 18 publications

References 3 publications

Durable resistance to late blight (Phytophthora infestans) in old potato cultivars

Durable resistance to late blight (Phytophthora infestans) in old potato cultivars

Estimation of the number of loci involved in the inheritance of resistance to Phytophthora palmivora (Butl.) Butl. in the leaves of Theobroma cacao L.

Determination of Resistance to Phytophthora infestans on Potato Plants in Field, Laboratory and Greenhouse Conditions

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