Cy. Chen et G. Seguin-swartz, Reaction of wild crucifers to Leptosphaeria maculans, the causal agent of blackleg of crucifers, CAN J PL P, 21(4), 1999, pp. 361-367
Citations number
26
Categorie Soggetti
Plant Sciences
Journal title
CANADIAN JOURNAL OF PLANT PATHOLOGY-REVUE CANADIENNE DE PHYTOPATHOLOGIE
Cotyledons, leaves, and stems of the wild crucifers Arabidopsis thaliana, D
iplotaxis muralis, Diplotaxis tenuifolia, and Raphanus raphanistrum and cot
yledons and leaves of Sisymbrium loeselii were inoculated with pycnidiospor
es of an aggressive isolate of Leptosphaeria maculans, the cause of blackle
g of crucifers. All species except R. raphanistrum expressed a high level o
f resistance to L. maculans; the resistance was characterized by rapid cell
death, tissue browning, and lignin deposition. In R. raphanistrum, the rea
ction of cotyledons and leaves ranged from a hypersensitive-like response t
o extensive tissue collapse and necrosis comparable to that observed in sus
ceptible Brassica napus cv. Westar; stem tissue of R. raphanistrum, however
, was highly resistant to L. maculans. The fungus was recovered from necrot
ic cotyledon and leaf tissue of all the wild crucifers 10 and 20 days posti
noculation, respectively, and from stem tissue of D. muralis around the poi
nt of inoculation 40 days postinoculation.