Plant Pathology Journal1812-53871812-5425Asian Network for Scientific Information10.3923/ppj.2008.131.139Sclerotinia sclerotiorum Populations in Sunflower From China, Canada and England]]>LiZiqin ZhangMin WangYingchun LiRu FernandoW.G. Dilantha 2200872This study ascertained mycelial compatibility groups
(MCGs) and pathogenicity variations of Sclerotinia sclerotiorum isolates
sampled in sunflower from China, Canada and England. For this purpose,
205 isolates (5 from England, 33 from Canada and 167 from China) were
grouped in 39 MCGs. Out of 39 MCGs, 64% were represented each by a single
isolate. Sclerotinia isolates from the three countries` were incompatible
between each other. Differences among MCGs were observed by comparing
their differences in radial growth, sclerotial yield on PDA and detached
leaves, aggressiveness and production of oxalic acid and total acids.
Significant differences were found in radial growth, sclerotial yield,
aggressiveness, production of oxalic acid and total acids within and among
MCGs (p < 0.001) regardless of their geographic origins. Correlation
analysis indicated that S. sclerotiorum aggressiveness was positively
related to oxalic acid production (r = 0.739, p <0.01) and negatively
related to pH (r = -0.436, p <0.01), but not to the radial growth and
the yields of sclerotia on PDA and detached sunflower leaves. Significantly,
sclerotial yield on PDA was positively correlated to the sclerotia weight
produced on detached sunflower leaf. There was a highly negative relationship
between pH values (negatively indicated total acids secretion) and oxalic
acid production (r = -0.669, p <0.01), suggesting that oxalic acid contributes
most to the total production of acids released by S. sclerotiorum.]]>Abawi, G.S. and R.G. Grogan,1975Sclerotinia sp.]]>65300309Adams, P.B. and W.A. Ayers,1979Sclerotinia species.]]>69896899Atallah, Z.K., B. Larget, X. Chen and D.A. Johnson,2004Sclerotinia sclerotiorum in the Columbia Basin of Washington State.]]>94737742Auclair, J., G.J. Boland, L.M. Kohn and I. Rajcan,2004Sclerotinia sclerotiorum using a straw inoculation method.]]>88891895Bateman, D.F. and S.V. Beer,1965Sclerotium rolfsii.]]>55204211Boland, G.J. and R. Hall,1994Sclerotinia sclerotiorum.]]>1693108Carbone, I., J.B. Anderson and L.M. Kohn,1999531121Carpenter, M.A., C. Frampton and A. Stewart,1999Sclerotinia sclerotiorum.]]>271322Cessna, S.G., V.E. Sears, M.B. Dickman and P.S. Low,2000Sclerotinia sclerotiorum, suppresses the oxidative burst of the host plant.]]>1221912199Cubeta, M.A., B.R. Cody, Y. Kohli and L.M. Kohn,1997Sclerotinia sclerotiorum on infected cabbage in Eastern North Carolina.]]>8710001004Dickman, M.B. and A. Mitra,1992Arabidopsis thaliana as a model for studying Sclerotinia sclerotiorum pathogenesis.]]>41255263Durman, S.B., A.B. Menendez and A.M. Godeas,2005Sclerotinia sclerotiorum.]]>3721802184Durman, S.B., A.B. Menendez and A.M. Godeas,2003Sclerotinia sclerotiorum (Sclerotiniaceae).]]>51421427Godoy, G., J.R. Steadman, M.B. Dickman and R. Dam,1990Sclerotinia sclerotiorum on Phaseolus vulgaris.]]>37179191Hambleton, S., C. Walker and L.M. Kohn,2002Sclerotinia sclerotiorum previously known from other crops predominate in 1999-2000 samples from Ontario and Que´bec soybean.]]>24309315Holley, R.C. and B. Nelson,1986767174Kohn, L.M., E. Stasovski, I. Carbone, J. Royer and J.B. Anderson,1991Sclerotinia sclerotiorum.]]>81480485Marciano, P., P. Magro and F. Favaron,1989S. sclerotiorum growth and oxalic acid production on selected culture media.]]>615760Noyes, R.D. and J.G. Hancock,1981Sclerotinia wilt of sunflower.]]>18123132Sexton, A.C. and B.J. Howlett,2004Sclerotinia sclerotiorum from Australian canola fields.]]>46357365Kull, L.S., W.L. Pedersen, D. Palmquist and G.L. Hartman,2004Sclerotinia sclerotiorum.]]>88325332