Inheritance of Collar Rot Resistance in the Tomato Breeding Lines C1943 and NC EBR-2

Maiero, Marisa

doi:10.1094/phyto-80-1365

Cited by 14 publications

(7 citation statements)

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“…These factors make it difficult to separate genetic and phenotypic resistance. Similar phenomena occur in other pathosystems (Maiero, 1990; Riaz et al ., 1991; Stevenson, 1994; Chang & Hwang, 2003; Visker et al ., 2003).…”

Section: Introductionsupporting

confidence: 79%

Factors influencing infection of eucalypts by Cylindrocladium pteridis

et al. 2009

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The pattern of Cylindrocladium pteridis adhesion, germination and penetration in eucalypt leaves was assessed using scanning electron microscopy. The effects of inoculum concentration, leaf wetness period, plant age and branch position of cylindrocladium leaf blight and defoliation severity were assessed in greenhouse studies using two Eucalyptus grandis × E. urophylla hybrid clones. Penetration occurred through stomata, and there was no difference in the number of penetrations between young and old leaves. Percentage leaf area with lesions and defoliation increased with the increase in inoculum concentration (1 × 102 to 105 conidia mL−1), duration of leaf wetness period (6 to 48 h) and plant age (60 to 180 days). Branch position in plants also significantly affected the percentage leaf area with lesions and defoliation, the latter variable being significantly higher at the stem base. The highest values of lesion area were also observed on leaves at the stem base in both clones. The Pearson correlation between defoliation and leaf area with lesions was significant in all experiments (r > 0·9) indicating a high association between these two variables.

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Section: Introductionsupporting

confidence: 79%

Factors influencing infection of eucalypts by Cylindrocladium pteridis

et al. 2009

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“…Glasshouse tests have also been used for assessing resistance to collar rot and stem lesions (Gardner 1990;Maiero et al 1990b). The basal stem of seedlings is sprayed with spores and covered with soil (Maiero et al 1990b) or seedlings are placed in a humidity chamber (Gardner 1990).…”

Section: Field Screeningmentioning

confidence: 99%

“…The basal stem of seedlings is sprayed with spores and covered with soil (Maiero et al 1990b) or seedlings are placed in a humidity chamber (Gardner 1990). Collar rot is usually rated in three to five symptom grades (Reynard and Andrus 1945;Gardner 1990;Maeiro et al 1990b).…”

Section: Field Screeningmentioning

confidence: 99%

“…One study on collar rot resistance reported a monogenic inheritance (Reynard and Andrus 1945), whereas Maiero et al (1990b) showed quantitative expression of resistance. Analysis by Maiero et al (1990b) using a joint scaling test showed that both additive and dominance effects controlled collar rot resistance in C1943 and NC EBR-2 sources, although the dominance effect of susceptibility appeared to be more important.…”

Section: Classical Studies Of Genetics Of Resistancementioning

confidence: 99%

“…Maiero et al (1990b) postulated that the collar rot resistance gene in C1943 and its derived line, NC EBR-2, is one of the genes Peralta, Knapp, and Spooner (personal communication) that confer EB resistance or is closely linked with EB resistance genes because these lines have both EB and collar rot resistance. In addition, stem lesion resistance may be independent of EB resistance.…”

Section: Classical Studies Of Genetics Of Resistancementioning

confidence: 99%

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

Chaerani¹,

Voorrips²

2006

J Gen Plant Pathol

217

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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