Search for sources of early blight (Alternaria solani) field resistance not associated with vegetative late maturity in tetraploid potato germplasm

Early blight of potato, caused by Alternaria solani, is an economically important foliar disease in most potato-growing regions. Growing cultivars with higher levels of resistance to early blight can reduce tuber yield losses and the need for fungicide applications. In this research, a bi-parental tetraploid potato population, segregating for resistance to early blight in leaves and tubers, was characterized to identify novel quantitative trait loci (QTL) associated with foliar and tuber early blight resistance. Assessment of the disease resistance in the foliage was performed by field evaluation and in tuber under controlled conditions. Results from this study revealed significant differences (P < 0.001) in resistance to A. solani among potato clones both in the leaves and in tubers. There was no statistically significant correlation (r = 0.06, P = 0.35) between the resistance scores from leaves and tubers. Several clones exhibited; however, high levels of resistance both in leaves and tubers and are; thus, promising candidates for breeding for early blight resistance. Linkage mapping revealed several QTL for early blight affecting both foliage and tubers. QTL associated with disease resistance in the tuber were found on chromosomes 1, 2, 3, 4, 8, 11 and 12. QTL associated with disease resistance in foliage were also examined for independence from defoliation, and independent QTL were; thus, found on chromosomes 5 and 11.

Download Full-text

Sources of resistance to early blight, Alternaria solani, and transfer to tomato, Lycopersicon esculentum

The Journal of Agriculture of the University of Puerto Rico ◽

10.46429/jaupr.v71i1.6927 ◽

1969 ◽

Vol 71 (1) ◽

pp. 85-95 ◽

Cited By ~ 2

Author(s):

Franklin W. Martin ◽

Paul Hepperly

Keyword(s):

Puerto Rico ◽

Lycopersicon Esculentum ◽

Early Blight ◽

Alternaria Solani ◽

Field Resistance ◽

Blight Resistance ◽

Sources Of Resistance ◽

Wild Tomato Species ◽

Tomato Species ◽

The Common

Tomato entries reported as early blight resistant were collected and evaluated under severe early blight infection in the warm rainy summer months of 1982-1985 in Mayagüez, Puerto Rico to identify sources with useful resistance in Puerto Rico. Of the common tomato lines, 84B 510-4 was the closest in resistance to the best wild tomato species, which are less susceptible to early blight than common tomatoes. Useful field resistance was found in the minority of cases, but one or more entries of L. esculentum f. cerasiforme, L. pimpinellifolium, L. esculentum X L. pimpinellifolium, and L. hirsutum var. typicum showed useful early blight resistance. Lowest disease ratings were found in varieties of L. hirsutum, which also showed the lowest yield. Better fruiting was found in L. pimpinellifolium although resistance levels were slightly less. Crosses of L. pimpinellifolium and L. hirsutum with useful early blight resistance to susceptible L. esculentum were followed in F1, F2, and F3 generations. Resistance appeared partially dominant from F1 disease ratings, and segregation in F2 suggested that many modifying genes both dominant and recessive were probably involved in conditioning early blight resistance. Generally, common tomatoes appear much more susceptible to early blight than wild species. To enlarge the pool of early blight resistence genes, F2 selection and progressive back crosses are suggested. Susceptible tomatoes were defoliated by early blight within one month after first flower during the warm rainy months; whereas, entries with useful resistance defoliated from 6 weeks to 2 months after the same stage.

Download Full-text

Effectiveness of Pseudomonas species in the management of tomato early blight pathogen Alternaria solani

African Journal of Microbiology Research ◽

10.5897/ajmr2017.8564 ◽

2017 ◽

Vol 11 (23) ◽

pp. 972-976 ◽

Cited By ~ 2

Author(s):

Joseph Abiodun ◽

Best Igbinosa Osaretin ◽

Tope Alori Elizabeth ◽

Oluwafemi Ademiluyi Benson ◽

Patrick Aluko Ajibola

Keyword(s):

Early Blight ◽

Alternaria Solani ◽

Pseudomonas Species

Download Full-text

Influence of tomato genotype to phenolic compounds content and antioxidant activity as reaction to early blight

Genetika ◽

10.2298/gensr1503099m ◽

2015 ◽

Vol 47 (3) ◽

pp. 1099-1110 ◽

Cited By ~ 1

Author(s):

Sladjana Medic-Pap ◽

Dejan Prvulovic ◽

Ana Takac ◽

Slobodan Vlajic ◽

Dario Danojevic ◽

...

Keyword(s):

Antioxidant Activity ◽

Early Blight ◽

Natural Infection ◽

Alternaria Solani ◽

Vegetable Crops ◽

Disease Occurrence ◽

Two Factors ◽

Biochemical Level ◽

Tomato Genotype ◽

Tomato Disease

Early blight is one of the most common and destructive tomato disease and it is caused by the fungus Alternaria solani. The aim of this paper was to screen the reaction of ten tomato genotypes (collection of the Institute of Field and Vegetable Crops) against natural infection of early blight. Tested genotypes showed significant differences in the disease occurrence on leaves but not on fruits. However, at the biochemical level, total phenolics (TP), tannins (TT), flavonoids (TF) and antioxidant activity in tomato fruits was significantly affected by genotype, disease occurrence and interaction of these two factors. According to obtained results, content of these secondary metabolites could be used as a one of the parameters in the evaluation of tomato resistance to EB.

Download Full-text