Screening potatoes for field resistance to early blight

Douglas, David R.; Pavek, J. J.

doi:10.1007/bf02862935

Cited by 35 publications

(19 citation statements)

References 2 publications

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“…In general, earlier cultivars are more susceptible to EB, whereas later cultivars are more resistant (Harrison et al, 1965;Douglas & Pavek, 1972;Rich, 1983;Brune et al, 1990;Herriott et al, 1990;Christ, 1991;Zhang, 2004), and this was confirmed in the present study. Of the five cultivars classified as resistant to EB, only cv.…”

Section: Discussionsupporting

confidence: 81%

“…EB occurred due to favorable weather conditions and the availability of pathogen inoculum, and the severity of the disease was dependent on the resistance level of each cultivar. Considering that the resistance level of potato cultivars is quite variable under field conditions (Douglas & Pavek, 1972), it is meaningful to define intermediate levels of resistance. Therefore, categories such as "moderately resistant" and "moderately susceptible" prove to be very useful in practice if the simple dichotomy of resistant and susceptible is not sufficient.…”

Section: Discussionmentioning

confidence: 99%

“…Potato resistance to EB appears to be associated with cultivar maturity, with the late-maturing cultivars tending to be more resistant than early-maturing cultivars (Douglas et al, 1972;Mendoza et al, 1986;Herriott et al, 1990;Pelletier & Fry 1990;Zhang, 2004;Dita-Rodríguez et al, 2006). However, because EB occurs most often during senescence of the host tissues, some cultivars may appear resistant simply because they are late maturing (Herriott et al, 1990).…”

Section: Introductionmentioning

confidence: 99%

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Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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Three field experiments were carried out to assess the level of resistance of several cultivars to early blight (EB) and to examine the association between host resistance and either foliage maturity or tuber skin types. A total of 26 cultivars were used in Exps. 1 and 2, and 24 in Exp. 3. Plants were inoculated with isolates of Alternaria grandis at 31 days after planting. EB severity was quantified in each plot every seven days. The approach to determine the resistance levels of potato cultivars was based on multivariate analysis techniques. The tested cultivars responded as either resistant, moderately resistant, moderately susceptible or susceptible to EB. Most of the cultivars were classified as susceptible or moderately susceptible to EB. Resistant cultivars were mid-season, mid-late or late maturity. None of the susceptible cultivars were later maturity (mid-late or late maturity). In most cases, susceptible cultivars were earlier maturity (early or mid-early maturity). Most resistant cultivars had rough, mid-rough or smooth skin. None of the susceptible cultivars had rough skin. In most cases, susceptible or moderately susceptible cultivars had smooth skin. Obtaining potato cultivars that are resistant to this destructive disease will help reduce production costs and the need for costly fungicides.

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Section: Discussionsupporting

confidence: 81%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Duarte¹,

Zambolim²,

Rodrigues³

et al. 2014

Trop. plant pathol.

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“…However, variation in the resistance of potato occurs between cultivars of the same maturity class, indicating that differences in resistance are not always or exclusively an artifact of maturity effects (Holley et al 1983;Christ 1991). So far, EB resistance screening in tomato, in contrast to potato, has not taken into account maturity classes or yield potential (Douglas and Pavek 1972).…”

Section: Mapping Resistance Genesmentioning

confidence: 99%

Tomato early blight (Alternaria solani): the pathogen, genetics, and breeding for resistance

Chaerani¹,

Voorrips²

2006

J Gen Plant Pathol

219

143

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Alternaria solani causes diseases on foliage (early blight), basal stems of seedlings (collar rot), stems of adult plants (stem lesions), and fruits (fruit rot) of tomato. Early blight is the most destructive of these diseases and hence receives considerable attention in breeding. For over 60 years, breeding for early blight resistance has been practiced, but the development of cultivars with high levels of resistance has been hampered by the lack of sources of strong resistance in the cultivated tomato and by the quantitative expression and polygenic inheritance of the resistance. In some accessions of wild species, high levels of early blight resistance have been found, but breeding lines still have unfavorable horticultural traits from the donor parent. Recently, the first linkage maps with loci controlling early blight resistance have been developed based on interspecific crosses. These maps may facilitate markerassisted selection. This overview presents the current knowledge about the A. solani-tomato complex with respect to its biology, genetics, and breeding.

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“…Therefore, breeders evaluate this trait when developing new cultivars. Nevertheless, there is no standard classification scheme used by potato breeders to characterize the maturity class of a cultivar [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17].…”

Section: Introductionmentioning

confidence: 99%

Examination of Potential Measures of Vine Maturity in Potato

Haga¹,

Weber²,

Jansky³

2012

AJPS

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Plant maturity is a complex physiological trait routinely evaluated by plant breeders because of its agronomic, economic, and breeding implications. In potato, plant maturity is typically estimated by monitoring vine characteristics. This study investigates several reported measures of vine maturity in potato cultivars, including examination of flower development, leaf chlorophyll content, and leaf peroxidase activity to see what method is most appropriate for maturity classification in temperate production regions. These three measures were evaluated multiple times throughout a single growing season across two locations. The data were analyzed using canonical discriminant and dichotomous tree analyses. Both methods revealed that flower development is not an accurate indicator of maturity, even though it is a common component of maturity screening protocols. Peroxidase measures were slightly better, but the optimal period of time to assess this trait was variable across locations and a considerable time commitment is required to collect and process samples. Monitoring leaf chlorophyll content throughout plant development was most appropriate for predicting vine maturity under these conditions, as this trait showed the most consistency and greatest prediction accuracy (69% -71%) relative to peroxidase activity and flowering development. Additionally, chlorophyll measurements are a more practical method of measuring maturity due to the ease of data collection. Leaf chlorophyll content best distinguished late cultivars from early-medium and medium-late cultivars. However, it did not separate early-medium from mediumlate cultivars. Combining chlorophyll monitoring with peroxidase and flowering measures improved the ability to distinguish among the early-medium and medium-late maturity classes. However, doing so only increased classification accuracy by 3%.

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Screening potatoes for field resistance to early blight

Cited by 35 publications

References 2 publications

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Field resistance of potato cultivars to foliar early blight and its relationship with foliage maturity and tuber skin types

Tomato early blight (Alternaria solani): the pathogen, genetics, and breeding for resistance

Examination of Potential Measures of Vine Maturity in Potato

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