GENETIC VARIATION IN REACTION TO SCLEROTINIA STEM ROT IN <i>Brassica</i> SPECIES

Sedun, F. S.; Séguin-Swartz, G.; Rakow, G.

doi:10.4141/cjps89-026

Cited by 14 publications

(6 citation statements)

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“…For example, Navabi et al (2010b) tested one accession each of B. carinata, B. nigra and B. oleracea. Several reports have suggested that B. carinata may be a promising source of resistance to SR (Sedun et al, 1989;Shivpuri et al, 1997;Navabi et al, 2010b), although the pathogen has caused significant disease levels in B. carinata crops in Florida and southern Italy (Corato and Baviello, 2000;Young et al, 2012). Given the quantitative nature of the resistance to SR identified so far, there is a need to quantify the range of resistance in each potential source species to ensure that selections with high resistance are identified for inclusion in breeding programmes.…”

Section: Introductionmentioning

confidence: 99%

New sources of resistance to Sclerotinia sclerotiorum for crucifer crops

Uloth

You

Finnegan

et al. 2013

Field Crops Research

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Section: Introductionmentioning

confidence: 99%

New sources of resistance to Sclerotinia sclerotiorum for crucifer crops

Uloth

You

Finnegan

et al. 2013

Field Crops Research

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“…Only one other report of abscission as a defense response to S. sclerotiorum was found. Sedun et al (1989) reported that abscission of infected leaf petioles of Brassica carinata in response to infection by S. sclerotiorum prevented the infection from spreading to the main stem. This defense response was not observed in any other Brassica sp.…”

Section: Discussionmentioning

confidence: 99%

“…In a similar study comparing greenhouse and field inoculations of soybean, sunflower, and dry bean, Vuong et al (2004) demonstrated a correlation between disease severity in greenhouse and field evaluations of dry bean varieties but found no correlation in sunflower and varying results for soybean. In studies evaluating field and vegetable crops, genetic resistance is often attributed to varieties that have slower lesion length development (Blanchette and Auld, 1978;Sedun et al, 1989). Varieties of Scaevola aemula, Portulaca grandiflora, and Pentas lanceolata had lesion lengths equal to susceptible control plants 14 DAI, indicating a lack of genetic resistance to S. sclerotiorum.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Annual Bedding Plants for Resistance to White Mold

Grabowski

Malvick

2015

horts

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White mold, caused by the necrotrophic fungus Sclerotinia sclerotiorum (Lib.) de Bary, causes stem rot, crown rot, wilt, and death of many common herbaceous ornamental plants. Relatively little research has been done on management of white mold and resistance to this disease in ornamental crops. Plant varieties from four genera of widely available annual bedding plants with no reported history of white mold susceptibility were evaluated for potential resistance to S. sclerotiorum. All plants were inoculated with three isolates of S. sclerotiorum and evaluated for disease severity in a controlled environment and under field conditions. Portulaca grandiflora Hook. ‘Sundial Scarlet’, P. grandiflora ‘Sundial White’, Pentas lanceolata Forssk. ‘Graffiti Pink’, and Scaevola aemula R. Br. ‘Whirlwind White’ were highly susceptible to white mold in the controlled environment but had significantly lower disease incidence and severity than Zinnia elegans ×angustifolia ‘Profusion White’, the susceptible control, under field conditions. Impatiens hawkeri W. Bull. ‘Sonic Red’, I. hawkeri ‘Sonic Amethyst’, I. hawkeri ‘Sonic White’, I. walleriana Hook. f. ‘Blitz 3000 Red’, I. walleriana ‘Blitz 3000 White’, and I. walleriana ‘Blitz 3000 Rose’ displayed abscission of diseased plant tissue as an unusual resistance response. Plants from all four genera that were evaluated became infected with S. sclerotiorum to a lesser extent than susceptible controls under field conditions and could be used as part of an integrated disease management program for white mold in ornamental plantings.

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“…Symptoms on Both B. napus and B. carinata Upon S. sclerotiorum Infection It has been reported in the literature that B. carinata is tolerant to S. sclerotiorum (Sedun et al 1989), and in order to verify this, stem inoculation experiments were performed in both B. napus and B. carinata. We observed that size of the lesion in B. napus increased over time while the lesion in B. carinata did not show any significant changes (p<0.05; Fig.…”

Section: Genementioning

confidence: 99%

“…Considerable efforts are underway to understand the comprehensive molecular responses of plants to this pathogen (Liang et al 2008;Yang et al 2007;Zhao et al 2007). Both B. napus and B. carinata are reported to be tolerant to S. sclerotiorum based on stem-inoculation studies (Sedun et al 1989); however, a later study indicated B. carinata to be more tolerant than B. napus (Shivpuri et al 1997). In order to investigate possible differences in the JA-, ET-, and SA-mediated signaling pathways between these two species at early stages of disease progression in leaves, the expression of five genes (AOC3, ERF2, NPR1, TGA5, and TGA6) were characterized.…”

Section: Introductionmentioning

confidence: 96%

Characterization of Defense Signaling Pathways of Brassica napus and Brassica carinata in Response to Sclerotinia sclerotiorum Challenge

et al. 2009

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Canola (Brassica napus L.) is an agriculturally and economically important crop in Canada, and its growth and yield are frequently influenced by fungal pathogens. Sclerotinia sclerotiorum is among those fungal pathogens and causes stem rot disease in B. napus whereas it has been reported that Brassica carinata is moderately tolerant to S. sclerotiorum. Jasmonic acid/ethylene (JA/ET) and salicylic acid (SA) are phytohormones that are known to be involved in plant disease responses. To investigate the defense signaling cascades involved in the interaction of B. napus and B. carinata with S. sclerotiorum, we examined the expression of five orthologs of B. napus genes involved in JA/ET or SA signaling pathways using quantitative RT-PCR. Our results indicated that there are differences in the timing of JA/ET and SA signaling pathways between B. napus and B. carinata. Our results in these two Brassica species also support previous observations that necrotrophic pathogens trigger JA/ET signaling in response to infection. Finally, we observed that transgenic canola expressing 1-aminocyclopropane-1-carboxylate-deaminase producing low levels of ET was relatively more susceptible to S. sclerotiorum than its wild-type counterpart, suggesting that ET inhibits S. sclerotiorum-induced symptom development.

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GENETIC VARIATION IN REACTION TO SCLEROTINIA STEM ROT IN Brassica SPECIES

Cited by 14 publications

References 1 publication

New sources of resistance to Sclerotinia sclerotiorum for crucifer crops

New sources of resistance to Sclerotinia sclerotiorum for crucifer crops

Evaluation of Annual Bedding Plants for Resistance to White Mold

Characterization of Defense Signaling Pathways of Brassica napus and Brassica carinata in Response to Sclerotinia sclerotiorum Challenge

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