Camelina Pathology

Summary: Phytoplasmas (‘Candidatus Phytoplasma’ spp.) are insect-vectored bacteria that infect a wide variety of plants, including many agriculturally important species. The infections can cause devastating yield losses by inducing morphological changes that dramatically alter inflorescence development. We describe a method for accessing the chaperonin-60 (cpn60) gene sequence from a diverse array of ‘Ca.Phytoplasma’ spp. The oligonucleotide-coupled fluorescent microsphere assay revealed ...

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Summary: Poor flowering was observed in May 2009 on plants seeded in late September 2008. Symptomatic plants showed an abundant white woolly growth on the undersides of leaves and on stems. Link: http://www.plantmanagementnetwork.org/pub/php/brief/2009/camelina/

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Summary: Camelina was recently introduced into North America, where it is currently grown commercially in Montana and North Dakota. During early June 2010, camelina plants from cultivar research trials began exhibiting downy mildew-like symptoms consisting of upper stem distortion and signs of white, fluffy masses covering stems, seed pods and heads. More investigation is warranted to determine whether these observations ...

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Summary: The objectives of this study were to establish baseline data on the feeding behavior and potential impact of L. hesperus on camelina, guayule, lesquerella and vernonia. Results show that L. hesperus will readily feed on the economically important tissues of all crops, and although previous research has shown that this feeding did not consistently affect lesquerella yield, further work ...

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Summary: In this study we evaluated 24 Eurasian crucifer species for disease reaction to North American isolates of the crop pathogens A. brassicicola and X. campestris pv. campestris. The test array comprised 190 entries (genebank accessions and weed populations), including 108 B. nigra entries from four geographic regions and 34 entries of Camelina sativa. Link: http://link.springer.com/article/10.1023%2FA%3A1003544025146

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Summary: An important low-input feature of camelina is its high level of resistance against plant diseases, which may partly be due to the production of antimicrobially efficient phytoalexins. In Central European countries such as Austria, downy mildew (Peronospora camelinae) is the only disease of camelina which has been found repeatedly, whereas other diseases and pests have been observed only occasionally. ...

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Summary: Effective host resistance to S. sclerotiorum is urgently needed if Sclerotinia rot is to be successfully managed across diverse oilseed, forage and vegetable crucifer crops worldwide. While this study highlighted individual genotypes that offer great potential for improving resistance to Sclerotinia rot in commercial cruciferous crops, it also demonstrated that assessment of the overall value of a species is ...

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Summary: Multiple laboratory and field feeding bioassays were conducted to determine the susceptibility of a wide range of crucifer species, cultivars, and accessions to feeding by flea beetles with the goal of discovering sources of resistant germplasm. The results indicate possible sources of resistance to Phyllotreta flea beetles, while highlighting the complicated roles that glucosinolates may play in Phyllotreta host ...

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Summary: There is interest in converting rainfed cropping systems in the Pacific Northwest from a 2-year rotation of winter wheat and cultivated fallow to direct-seed (no-till) systems that include chemical fallow, spring cereals, and food legume and brassica crops. The density of Pratylenchus spp. was greater in cultivated than chemical fallow, became greater with increasing frequency of host crops, and ...

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Summary: Camelina sativa, a wild relative of Brassica crops, is virtually immune to blackspot disease caused by Alternaria brassicicola. Intertribal somatic hybrids were produced between C. sativa and rapid-cycling Brassica oleracea as a step toward the transfer of resistance to this disease into Brassica vegetable crops. Resistance was correlated with the induction of high levels of the phytoalexin camalexin 48h ...

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Summary: Development of leaf spot resistant mustard cultivars is a relevant objective in view of heavy crop losses caused by this pathogen. Thirty-eight species belonging to 9 genera, including cultivated and wild allies, of the genus Brassica were evaluated under epiphytotic conditions for two years. Eight species (Brassica desnottesii, Camelina sativa, Coincya pseuderucastrum, Diplotaxis berthautii, D. catholica, D. cretacea, D. ...

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Summary: A review of the literature indicates that C. sativa is highly resistant to alternaria black spot and blackleg of crucifers. Genotypes resistant to sclerotinia stem rot, brown girdling root rot, and downy mildew can be found among C. sativa accessions, raising the possibility of developing cultivars resistant to these diseases. However, C. sativa is susceptible to clubroot, white rust, ...

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Summary: This study shows that both Camelina sativa as well as Capsella bursa-pastoris are capable of metabolizing destruxin B, the host-specific toxin produced by the fungal pathogen A. brassicae during infection. Considering that C. sativa and C. bursa-pastoris detoxify destruxin B and produce the phytoalexins camalexins, these wild crucifers appear to represent unique and perhaps useful sources of black spot ...

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Summary: Feeding damage by the crucifer flea beetle, Phyllotreta cruciferae, was assessed on 51 accessions of false flax, Camelina sativa, and compared with damage to seven other crucifer species. Flea beetles were observed sitting on false flax in the field, sometimes in high numbers, but they did not feed. Resistance in false flax may result from the absence of cues ...

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Summary: Extracts of quercetin glycosides from three-week old leaves of Camelina sativa were tested for their effects on crucifer flea beetle feeding. Link: http://www.sciencedirect.com/science/article/pii/S030519781100247X

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Summary: In Canada, seven phytoplasma taxa have been detected in various crops. Aster yellows, the primary vector of which is the leafhopper Macrosteles quadrilineatus, is the most common and widespread. Ash yellows and pear decline have caused economic problems for several decades, while bois noir, a quarantinable disease in Canada, was detected in Ontario and British Columbia for the first ...

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Summary: Camelina sativa is a wild crucifer that is reported to be resistant to Alternaria blight. In order to transfer Alternaria resistance to B. carinata, fusion of protoplasts of the two species was performed. Confirmation of hybridity was obtained from the morphology of in vitro produced leaves, somatic chromosome number in leaf tips, and restriction fragment length polymorphism for a ...

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Summary: This appears to be the first report of elicitation of phytoalexins from roots of crucifers. Additionally, two preformed antimicrobial compounds were identified as methyl 1-methylindole-3-carboxylate and 10-methyl sulfinyldecylisothiocyanate. Link: http://link.springer.com/article/10.1007%2FBF03321963

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Summary: False flax (Camelina sativa L.) plants were found to be infected with a yellows-type disease caused by a phytoplasma in experimental plots at the Edmonton Research station, Alberta, Canada. DNA amplification with specific primer pair R16(1)F1/R1 and restriction fragment length polymorphism indicated the presence of AY phytoplasma in the infected false flax sample. This is the first reported characterization ...

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Summary: Leaves of C. sativa were highly resistant to A. brassicae. No disease was seen until leaves began to senesce after 6 days and then only as localized brown flecks after inoculation with 100-10000 conidia. Camelina sativa produced a phytoalexin even when very few conidia were deposited on leaves. The phytoalexin concentration increased with increasing inoculum until leaves started to ...

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Summary:  The prefeeding behaviours of adult crucifer flea beetles, Phyllotreta cruciferae, were determined on seedlings of the host plant, Brassica napus, and compared to behaviors on seedlings of the nonhost crucifers, Crambe abyssinica, Sinapis alba, and Camelina sativa. Link: http://link.springer.com/article/10.1023%2FB%3AJOIR.0000025130.20327.1a

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Summary: Camelina sativa (false flax) is highly resistant to Alternaria spp. and has, in addition, other desirable characters for the improvement of B. oleracea; however, the two species don not cross. In order to create B. oleracea/C. sativa hybrids, protoplast fusions were performed using PEG treatment. Link: http://link.springer.com/article/10.1023%2FA%3A1018604919488

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Summary: The cabbage root fly attacks a wide range of cruciferous plants, with differing odours, implying that several volatile chemicals are probably involved in attracting the flies and in stimulating them to lay. Oviposition by the cabbage root fly was studied, therefore, on a large range of wild and cultivated plants to determine the most preferred species. Link: http://onlinelibrary.wiley.com/doi/10.1111/j.1570-7458.1978.tb02793.x/abstract

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Summary: We present histochemical, gene expression and biochemical data investigating the role of monolignols in the resistance of C. sativa to S. sclerotiorum. Results provide evidence that plant cell wall strengthening plays a role in the resistance of C. sativa to S. sclerotiorum, and that both constitutive and inducible defence mechanisms contribute to reduced symptom development in resistant germplasm. This ...

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Summary: The most substantial threat to novel crop species is not lack of agronomic knowledge or poorly adapted cultivars, but weed competition. This is largely due to a lack of approved herbicides. Alternative crop production is severely restricted by this issue, which has occurred as a result of legislation requiring manufacturers to obtain approval for every agrochemical on each crop ...

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Summary: An accession of Brassica campestris ssp. rapifera was less susceptible to Alternaria brassicae than B. campestris ssp. oleifera and B. napus ssp. oleifera. Accessions of Camelina sativa and Capsella bursa-pastoris were very resistant to A. brassicae, showing no symptoms. Production of phytoalexins of different types and amounts was found in all the above mentioned crucifers in response to A. ...

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Summary: Brassicaceae germplasm (Brassica napus , B. rapa , B. juncea , B. carinata , Sinapis alba, Camelina sativa , Crambe species) with cultivar development potential for the prairies was evaluated for resistance to cabbage seedpod weevil (Ceutorhynchus obstrictus) infestation under field conditions in southern Alberta from 2001 to 2005. Link: http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8489045

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Summary: This paper describes the isolation, separation, and structure elucidation of the major component produced by C sativa which is fungitoxic to A. brassicae. Link: http://cabdirect.org/abstracts/19912313796.html;jsessionid=90D5DB93E9E8E31D0608C839B1DAE250

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Summary: Camelina (Camelina sativa) plants with symptoms of downy mildew were obtained from three different locations in Washington State. The causal pathogen was identified as Hyaloperonospora camelinae. Seed treated with mefenoxam, a fungicide specific for Oomycetes, significantly reduced the incidence of the disease. Link: http://www.apsnet.org/publications/plantdisease/2012/November/Pages/96_11_1670.aspx

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