Heterothallism in Peronospora parasitica

Bruyn, Helena L. G. de

doi:10.1007/bf02067479

Cited by 19 publications

(5 citation statements)

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“…It has a relatively wide host range, infecting not only B. oleracea, but almost all cultivated and some weed species in the family Brassicaceae (Dickinson and Greenhalgh, 1977;McMeekin, 1969;Sherf and MacNab, 1986). De Bruyn (1937) and McMeekin (1960) suggested that heterothallism may give this pathogen substantial capacity for genetic variation. Differential interaction between B. oleracea hosts and P. parasitica isolates has been reported by several groups (Davison, 1966;Dias et al, 1993;Dickinson and Greenhalgh, 1977; objective was to determine if DH lines derived from 'Everest' exhibit resistance to downy mildew, and, if so, to characterize the phenotypic expression of resistance in these lines.…”

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Phenotypic Variation for Downy Mildew Resistance among Inbred Broccoli

Wang¹,

Farnham²,

Thomas³

2000

HortSci

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Downy mildew, caused by Peronospora parasitica (Pers. Fr.) Fr., is one of the most economically important diseases of broccoli (Brassica oleracea L. Italica group). Previous studies have shown that resistance to downy mildew in broccoli is dependent on plant age with seedling resistance being independent of mature-plant resistance. The objectives of this study were to: 1) determine if valid evaluations for downy mildew resistance can be conducted at both the cotyledon and the three to four true-leaf stages on the same plants of a given broccoli entry; 2) determine if doubled-haploid (DH) lines derived from the resistant hybrid `Everest' also exhibit resistance to downy mildew and if so, characterize the resistance phenotype(s) in these lines; and 3) determine if identified resistant DH lines exhibit resistance to isolates of P. parasitica acquired from different geographic regions of the United States. Twenty-three DH broccoli inbreds and two commercial hybrids were evaluated for reaction at different developmental stages to infection by P. parasitica in a controlled environment. Results showed that broccoli plants can be evaluated for downy mildew resistance in a two-stage process. Inoculation at the cotyledon stage did not offer any cross-protection or otherwise influence the expression of reaction phenotype (RP) when the same plants were subsequently inoculated at the three to four true-leaf stage. Three different RPs to infection by P. parasitica were identified in DH inbreds. These were: 1) susceptibility at both the cotyledon stage and the true-leaf stage; 2) resistance at both the cotyledon and true-leaf stage; and 3) susceptibility at the cotyledon stage but resistance at the true-leaf stage. There was no effect of two pathogenic isolates from different geographic regions on RP of DH broccoli inbreds. Selection of plant resistance to downy mildew at the cotyledon stage will effectively identify plants with high levels of resistance at subsequent developmental stages.

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Phenotypic Variation for Downy Mildew Resistance among Inbred Broccoli

Wang¹,

Farnham²,

Thomas³

2000

HortSci

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“…The pattern of sexuality of P. sylvaticum is as complex as those described for other oomycetes (1,3,5,9,12,22,24,26). This sexual system may be described by at least four sexual variables: (i) homothallic character, (ii) heterothallic sex, (iii) heterothallic sexual strength, and (iv) heterothallic compatibility.…”

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confidence: 97%

“…Reports of heterothallism followed for Achlya (8,21), Pltytophthora (14,17), Peronospora (5), and Sapromyces (3). Some species in all these genera have complex patterns of sexuality, but heterothallic species of Achlya and Phytophthora have been studied most.…”

Section: Introductionmentioning

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The sexuality and population structure of Pythium sylvaticum

Pratt¹,

Green²

1973

Can. J. Bot.

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51 : 429-436. 1973. The sexuality and population structure of Sexual characteristics of 36 isolates of Pythi~~nz sylvatic~mz were investigated. Fourteen of 15 heterothallic males were also homothallic while only 2 of 21 females were homothallic. Four male and five female groups of isolates were delineated by similar reacting patterns under five different temperature and light conditions. Mature oospores formed in crosses varied with both male and female isolates and were not correlated with sexual strengths of reacting isolates. Three-to-one ratios of males to all other progeny occurred among 198 single-oospore progeny of two crosses involving non-homothallic parents. Most progeny were also homothallic. A pattern for the distribution of sexual characteristics of natural populations of P. sylvaticrun is proposed based on characteristics of the 36 isolates.

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“…Such heterothallic behaviour has been reported for P. parasitica (DeBruyn, 1937;McMeekin, 1960; Kluczewski and Lucas, 1983;Sherriff and Lucas, 1989b;Sequeira and Monteiro, 1996). Homothallic forms of P. parasitica have also been observed (De Bruyn, 1937;Sherriff and Lucas, 1989b; Sequeira and Monteiro, 1996 HAU, Huazhong Agricultural University, Wuhan, P.R. China.…”

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confidence: 99%

Monograph on downy mildew of crucifers.

Canada¹,

Nashaat²,

Saharan³

et al. 1997

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Arabidopsis spp. Armoracia rusticana Arabis spp. Aubretia spp. Brassica alba B. arvensis B. alboglabra B. chinensis B. juncea B. kaber B. hirta B. fructiculosa B. napus B. napus var. napobrassica B. nigra B. oleracea var. acephala B. oleracea var. botrytis B. oleracea var. capitata B. oleracea var. caularapa B. oleracea var. gemmifera B. oleracea var. gengyloides B. pekinensis B. campestris var. rapifera B. campestris var. yellow sarson B. campestris var. brown sarson B. campestris var. toria Chenopodium album B. tournefortii Barbarea Camelina sativa Cheiranthus allioni C. cheiril Capsella brusa-pasteris Cardamine impatiens C. rhomboidea Coronapus didymus C. squamatus Crambe maritima Dentaria spp. D. laciniata Descurainia spp. Draba spp. D. caroliniana Eruca sativa Hesperis spp. Horseradish Rockcress Aubretia White mustard Wild mustard Chinese kale Chinese cabbage Mustard White mustard White mustard Rape Swedes Black mustard Marrow stem kale Cauliflower Cabbage Brussels sprouts Kohlrabi Chinese cabbage Turnip Yellow sarson Brown sarson

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Heterothallism in Peronospora parasitica

Cited by 19 publications

References 2 publications

Phenotypic Variation for Downy Mildew Resistance among Inbred Broccoli

Phenotypic Variation for Downy Mildew Resistance among Inbred Broccoli

The sexuality and population structure of Pythium sylvaticum

Monograph on downy mildew of crucifers.

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