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Agnola, Bérénice; Boury, S.; Monot, C.; Quillévéré, Anne; Hervé, Y.; Silué, D.

doi:10.1023/a:1024217223829

Cited by 18 publications

(9 citation statements)

References 33 publications

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“…Our results agree with those found by Agnola et al (2003), who compared downy mildew susceptibility of leaf discs from fully-developed leaves occupying 17 leaf positions on 10-18 week-old Brassica plants and showed that discs collected below the sixth leaf are susceptible, and those collected above the sixth leaf are moderately susceptible to resistant.…”

Section: Resultssupporting

confidence: 92%

“…Older leaves were significantly more susceptible on positions 2 to 9, 11, and 13 from line 'PCB17.11', on position 5 from line 'PCB21.32', on positions 3 to 7 from line 'PCM21.11', and on positions 4 to 6, and 11 from line 'PCA12.112' (Table 3). Agnola et al (2003) observed greater resistance to downy mildew in young leaves than in older leaves of Brassica hosts. Increased susceptibility to pathogens with leaf age has also been reported for other hostpathogen systems such as Alternaria helianthi on sunflower (Allen et al 1983) or P. tabacina on tobacco leaves (Cohen et al 1987).…”

Section: Effect Of Leaf Agementioning

confidence: 77%

“…position 5 on line 'PCB21.32', positions 3 to 6 on line 'PCM21.11' and positions 4 and 5 on line 'PCA12.112'. This is not supported by Agnola et al (2003), who verified that in resistant hosts the discs are resistant whatever the leaf position. Other species react differently.…”

Section: Effect Of Leaf Agementioning

confidence: 90%

“…In 'Couve Algarvia', resistance at cotyledon and adult-plant stages is under the control of two different genetic systems (Monteiro et al 2005). Agnola et al (2003) used leaf discs collected from 17 leaf positions in 10-18 week-old Brassica plants to show that incompatible reactions occur regardless of leaf position, but with compatible reactions, sporulation intensity varies with the position of the leaf on the stem.…”

Section: Introductionmentioning

confidence: 99%

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Leaf position, leaf age and plant age affect the expression of downy mildew resistance in Brassica oleracea

Coelho¹,

Valério

Monteiro

2009

Eur J Plant Pathol

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Downy mildew caused by the oomycete Hyaloperonospora parasitica (formerly Peronospora parasitica) is a worldwide foliar disease of Brassica vegetables, which may cause seedling loss in the nurseries and damage to adult plants in the field. Disease symptoms start from the lower leaves and progress upwards. Three experiments were conducted under controlled environment conditions, using inoculated leaf discs, to determine the influence of leaf position, plant age, and leaf age on the expression of resistance to downy mildew in various Brassica oleracea genotypes. The upper leaves were more resistant than the lower leaves when 7-19 week-old plants of broccoli and Tronchuda cabbage were tested. Broccoli lines 'PCB21.32' and 'OL87123-2' were fully susceptible at the cotyledon stage, showed a clear resistance increase from lower to upper leaves at 6 weeks and 'PCB21.32' was fully resistant 16 weeks after sowing. Immature leaves were more resistant than adjacent fully expanded mature leaves. Susceptibility increased with leaf age when the same leaf was tested at two to 4-week intervals. Leaf age and upper-leaf position on the stem had opposite effects on disease score, since younger leaves collected from lower positions and older leaves collected from upper positions tended to score similarly in compatible interactions. The progression of downy mildew from the base of the plant upwards on B. oleracea in the field could be due to differences in leaf resistance in addition to environmental variation. To maximise the expression of a compatible reaction in adult plants lower leaves of Brassica plants that are at least 12 weeks-old should be used.

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Section: Resultssupporting

confidence: 92%

Section: Effect Of Leaf Agementioning

confidence: 77%

Section: Effect Of Leaf Agementioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Leaf position, leaf age and plant age affect the expression of downy mildew resistance in Brassica oleracea

Coelho¹,

Valério

Monteiro

2009

Eur J Plant Pathol

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“…We have shown that pathogenic variability exists in the P. parasitica population present in Brittany (Silué et al 1995(Silué et al , 1996Agnola et al 2003) and the isolates used in laboratory screens were characterized for pathogenicity. From 1997 to 1999 important epidemics of downy mildew occurred in both, seedbeds and the field allowing Brassica accessions to be easily assessed and categorized for their resistance or susceptibility.…”

Section: Introductionmentioning

confidence: 99%

Comparison of the resistance and susceptibility to downy mildew [Hyaloperonospora parasitica, constant. (Pers. Ex Fr)] of nine Brassica olearacea accessions in laboratory, seedbed, and field screens

Monot¹,

Silué²

2009

Euphytica

Self Cite

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The relationship between resistance in seedlings, young and adult plants is studied for the pathosystem Brassica oleracea-Hyaloperonospora parasitica. Genotypes identified in the laboratory as resistant or susceptible or exhibiting a differential reaction to a selection of H. parasitica isolates were tested in 1997-1999 in seedbeds and fields under natural infestation. Isolates tested in the laboratory were grouped in five pathotypes, of which four were presented by isolates from Brittany, France. Genotypes susceptible to all pathotypes in the laboratory were also susceptible in the seedbed and field tests, while genotypes expressing a differential response to pathotypes were either resistant or susceptible. Accessions Everest, DEGC, ESPG and RS1105 exhibiting resistance to all pathotypes except I, were resistant in all environments and remained resistant in 2000-2002. Pathotype I was not prevailing in the field and results support the hypothesis that accessions resistant under laboratory conditions will be resistant under field conditions, provided the same pathotypes are present under the laboratory and field conditions.

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Genomic Design for Biotic Stress Tolerance in Vegetable Brassicas

Chhapekar

Singh

et al. 2022

Genomic Designing for Biotic Stress Resistant Vegetable Crops

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Untitled

Cited by 18 publications

References 33 publications

Leaf position, leaf age and plant age affect the expression of downy mildew resistance in Brassica oleracea

Leaf position, leaf age and plant age affect the expression of downy mildew resistance in Brassica oleracea

Comparison of the resistance and susceptibility to downy mildew [Hyaloperonospora parasitica, constant. (Pers. Ex Fr)] of nine Brassica olearacea accessions in laboratory, seedbed, and field screens

Genomic Design for Biotic Stress Tolerance in Vegetable Brassicas

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