Evaluation of the Resistance to Powdery Mildew, Sphaerotheca Pannosa Var Rosae, of Rose-Tree Species and Hybrids

Ferrero, Frédéric; Cadour-Marvaldi, P.; Guilloteau, E.; Jacob, Yannick; Coudret, A.; Sallanon, Huguette

doi:10.17660/actahortic.2001.547.46

Cited by 4 publications

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“…Genotypes with different degrees of resistance were found and several defence mechanisms of plants against the pathogen have been described. Morphological changes such as the vacuolization of epidermal cells (Temmen et al, 1980), physical barriers such as leaf cuticle thickness (Ferrero et al, 2001) and the formation of papillae in plant cells (Mence and Hildebrandt, 1966) were found to influence fungal penetration. Hypersensitive response (HR) (Conti et al, 1985), simple monogenic control (De Vries and Dubois, 2001), a single dominant gene (Linde and Debener, 2003) and horizontal resistance (Schlosser, 1990;De Vries and Dubois, 2001) confer powdery mildew resistance.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Partial Resistance to Powdery Mildew (Podosphaera pannosa) in a Tetraploid Rose Population Using a Spore-suspension Inoculation Method

et al. 2006

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Powdery mildew (Podosphaera pannosa) is the most important fungal disease in greenhouse roses and is in practice controlled by fungicides. The creation of novel cultivars with durable resistance to powdery mildew is highly desirable. To understand the inheritance of mildew resistance, a tetraploid rose population with a size of 181 seedlings was obtained by crossing two tetraploid genotypes each having partial resistance. The population and its parents were tested under greenhouse conditions with two well-defined monospore isolates (2 and F1) using artificial inoculation with spore suspensions. Disease score at 11 days postinoculation, latent period and rate of symptom development were used to describe seedling resistance. The tests for both isolates exhibited a wide and significant variation among genotypes for resistance. The distribution of the genotypic means of the disease scores was continuous and showed a considerable transgression. Statistical analysis, scatter plot of disease scores for the isolates, and correlation analyses indicated that the two isolates differed in pathogenicity. The outcome of the tests showed that the inoculation assay with spore suspensions was a reliable and effective way to screen large numbers of genotypes under greenhouse conditions for genetic and breeding studies. This is the first report on spore-suspension inoculation to be used successfully in rose.

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Section: Introductionmentioning

confidence: 99%

Assessment of Partial Resistance to Powdery Mildew (Podosphaera pannosa) in a Tetraploid Rose Population Using a Spore-suspension Inoculation Method

et al. 2006

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“…Hajlaoui also demonstrated the formation of a cellulose-rich collar around the haustorial neck of P. pannosa. Many reports considered the evaluation of powdery mildew resistant rose species, varieties and hybrids (Ferrero et al 2001b). Mence and Hildebrandt (1966) tested 17 cultivated varieties and six species with an inoculum from two sources with a detached leaflet technique.…”

Section: Introductionmentioning

confidence: 99%

Isolation and identification of eight races of powdery mildew of roses (Podosphaera pannosa) (Wallr.: Fr.) de Bary and the genetic analysis of the resistance gene Rpp1

Linde

Debener

2003

Theor Appl Genet

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Powdery mildew, caused by Podosphaera pannosa, is one of the most-severe diseases of roses grown under glass. The differentiation into physiological races and the genetic analysis of resistance in a segregating host population was investigated using single conidial isolates of the pathogen. Using ten rose genotypes, all eight isolates of the pathogen could be ascribed to different races. Five races were isolated from one location, which indicates that populations of P. pannosa exhibit a high racial diversity. Infection experiments in a backcross-population of 114 rose plants resulted in a 1:1 segregation, suggesting control by a single dominant gene. Rpp1 is the first resistance gene against rose powdery mildew to be described.

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Breeding Roses for Disease Resistance

Whitaker

Hokanson

2009

Plant Breeding Reviews

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Evaluation of the Resistance to Powdery Mildew, Sphaerotheca Pannosa Var Rosae, of Rose-Tree Species and Hybrids

Cited by 4 publications

References 0 publications

Assessment of Partial Resistance to Powdery Mildew (Podosphaera pannosa) in a Tetraploid Rose Population Using a Spore-suspension Inoculation Method

Assessment of Partial Resistance to Powdery Mildew (Podosphaera pannosa) in a Tetraploid Rose Population Using a Spore-suspension Inoculation Method

Isolation and identification of eight races of powdery mildew of roses (Podosphaera pannosa) (Wallr.: Fr.) de Bary and the genetic analysis of the resistance gene Rpp1

Breeding Roses for Disease Resistance

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