SSR assessment of <i>Phytophthora infestans</i> populations on tomato and potato in British gardens demonstrates high diversity but no evidence for host specialization

Stroud, James Alexander; Shaw, David; Hale, Michael; Steele, Katherine A.

doi:10.1111/ppa.12407

Cited by 29 publications

(21 citation statements)

References 27 publications

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“…In Germany, amateur garden production accounts for about 50% of tomato production [7] but does not appear in the official statistics. In the UK, little or no commercial outdoor cultivation occurs [8], although outdoor tomatoes are widely grown by amateur gardeners [9]. The number of allotment plots in England alone exceeds 150000 [10].…”

Section: Introductionmentioning

confidence: 99%

Heritability and Variability of Quality Parameters of Tomatoes in Outdoor Production

et al. 2020

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The tomato is the most important vegetable globally. In England, outdoor tomatoes are widely grown by amateur gardeners, with the number of their allotment plots exceeding 150000. For instance, in Germany, only about 16% of tomato plants are cultivated according to organic standards, although these rates are expected to increase. Breeding for yield and fruit quality can increase resource efficiency. Therefore, we need to evaluate the variability of yield and fruit quality parameters, to calculate the heritability of these traits and to identify superior genotypes for organic outdoor tomato production and breeding. With these aims, we grew 24 tomato genotypes of diverse origins in a two-year field trial. The heritability of quality traits such as glucose, fructose, organic acid, and lycopene was high. The medium heritability for yield suggests that trials with a larger number of locations are needed for the reliable selection of this character. Negative correlations of sugar concentrations with fruit weight and of organic acid concentration with fruit weight and yield suggest trade-offs in breeding for larger fruits and higher yields. Breeding for increased lycopene content is not subject to these challenges; the concentrations of the primary metabolite sugars and organic acids are positively correlated.

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Section: Introductionmentioning

confidence: 99%

Heritability and Variability of Quality Parameters of Tomatoes in Outdoor Production

et al. 2020

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“…Furthermore, no host‐related specificity has been reported in situations where both hosts often coexist, for example in British gardens (Stroud et al . ) or crop fields in Nicaragua (Blandón‐Díaz et al . ).…”

Section: Introductionmentioning

confidence: 99%

The coexistence of generalist and specialist clonal lineages in natural populations of the Irish Famine pathogen Phytophthora infestans explains local adaptation to potato and tomato

et al. 2017

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Phytophthora infestans, causing late blight on Solanaceae, is a serious threat to potato and tomato crops worldwide. P. infestans populations sampled on either potato or tomato differ in genotypes and pathogenicity, suggesting niche exclusion in the field. We hypothesized that such niche separation can reflect differential host exploitation by different P. infestans genotypes. We thus compared genotypes and phenotypes in 21 isolates sampled on potato (n = 11) or tomato (n = 10). Typing at 12 microsatellite loci assigned potato isolates to the 13_A2, 6_A1 and 1_A1 lineages, and tomato isolates to the 23_A1, 2_A1 and unclassified multilocus genotypes. Cross-inoculations on potato and tomato leaflets showed that all isolates were pathogenic on both hosts. However, tomato isolates performed much better on tomato than did potato isolates, which performed better on potato than did tomato isolates, thus revealing a clear pattern of local adaptation. Potato isolates were significantly fitter on potato than on tomato, and are best described as potato specialists; tomato isolates appear to be generalists, with similar pathogenicity on both hosts. Niche separation in the field may thus result mainly from the large fitness gap on tomato between generalists and unadapted potato specialists, while the small, but significant fitness difference on potato between both types of isolates may prevent population invasion by generalists. Extreme specialization to potato seems very costly relative to performance loss on the alternative host. This study therefore shows that local adaptation and niche separation, commonly expected to involve and generate specialists, can occur with generalists.

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“…The pathogen assaults all over the ground portions of the plant including leaves, petioles, stems and organic product at any growth stage, causing scourges, corruption, blotches and spoils that lessen yield and natural product quality (Lievens et al, 2004). The disease can spread and execute plants quickly when ideal natural states of high moistness and low temperature (18°C) win (Haq Italic., 2008 andStroud et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of Resistance against Phytophthora Infestans in Wiled Tomato Genotype (Lycopersicon hirsutum l03684) وراثة المقاومة للندوة المتاخرة فی الترکیب الوراثی البری L03684 التابع للنوع Lycopersicon hirsutum

العفیفی¹,

السید²,

السعدی³

et al. 2019

Journal of Plant Production

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Many varieties commercial's tomatoes have been grown in Egypt but most of them susceptible to the disease of late blight, which are very important and most dangerous fungal diseases that destroy the tomato crop in all its parts caused by the disease Phytophthora infestans. The L03684 wild tomato genotype was obtained from the Asian Development Center for Vegetables. The inter specific cross between L03684 and Edkawi species was done to obtained the six populations and study resistance of Late blight heredity, and assessment of genetic parameter for resistance. Results showed that, Many genes control the heredity of resistance to P. Infestans and resistant is inherited as a quantitative trait. While, susceptibility to late blight is a dominant characteristic of resistance. The heritability in broad (H b.s %) estimates were 71.8 and in narrow sense (H n.s %) estimates were 39.35% for severity detect the proportion of the environmental factors on the total variation. the inheritance of resistance to P. infestans greatly affected by dominance gene effects. While that, gene effects of estimations were low. So the effects of gene refers to epistasis more important than the additive. This study showed that, the inter actions between additive and dominance were highly significant in the inheritance of resistance to P. infestans. One of the best methods to breeding to improve this resistance by the reciprocal recurrent selection.

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SSR assessment of Phytophthora infestans populations on tomato and potato in British gardens demonstrates high diversity but no evidence for host specialization

Cited by 29 publications

References 27 publications

Heritability and Variability of Quality Parameters of Tomatoes in Outdoor Production

Heritability and Variability of Quality Parameters of Tomatoes in Outdoor Production

The coexistence of generalist and specialist clonal lineages in natural populations of the Irish Famine pathogen Phytophthora infestans explains local adaptation to potato and tomato

Inheritance of Resistance against Phytophthora Infestans in Wiled Tomato Genotype (Lycopersicon hirsutum l03684) وراثة المقاومة للندوة المتاخرة فی الترکیب الوراثی البری L03684 التابع للنوع Lycopersicon hirsutum

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