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Reaction of three cotton ( Gossypium hirsutum ) cultivars to single and mixed isolates of Xanthomonas campestris pv. malvacearum
Author(s) -
WALLACE* T. P.,
ELZIK K. M.
Publication year - 1992
Publication title -
plant pathology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.928
H-Index - 85
eISSN - 1365-3059
pISSN - 0032-0862
DOI - 10.1111/j.1365-3059.1992.tb02455.x
Subject(s) - xanthomonas campestris , biology , inoculation , virulence , cultivar , gossypium hirsutum , xanthomonas , blight , germplasm , horticulture , veterinary medicine , bacteria , medicine , biochemistry , genetics , gene
Cotyledons of resistant and susceptible cotton ( Gossypium hirsutum ) cultivars were inoculated artificially with four isolates of Xanthomonas campestris pv. malvacearum from Africa (H V1, HV3, H V7 and Sudan) and USA race 18. Each isolate was used as single inoculum and in combinations of mixed inoculum. Disease reactions were graded 15 days after inoculation on a scale of I (immunity) to 10 (fully susceptible). Inoculation with HVI alone produced the highest disease grade of all inoculum treatments. When HVI was included in a mixed inoculum, disease grades were greatly reduced compared to HVI alone. Disease grades were highest for the inoculum mixture of the most virulent isolates HVI and race 18, but were still reduced compared to those from HVI alone. The efficiency of selection when screening cotton germplasm for bacterial blight resistance may be reduced if the highly virulent HVI isolate is included in an inoculum mixture composed of non‐virulent isolates.