Effects of water potential on mycelial growth, sclerotial production, and germination of Rhizoctonia solani from potato

Ritchie, Faye; McQuilken, M. P.; Bain, R. A.

doi:10.1016/j.mycres.2006.04.008

Cited by 56 publications

(58 citation statements)

References 37 publications

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“…Two temperature treatments were tested together with fungicide in a complete factorial design: 24 or 27°C. The lower temperature is about optimal for mycelial growth of R. solani AG-3 on potato-dextrose agar (Ritchie et al 2009). In total, there were 10 isolates 9 3 fungicide concentrations 9 2 temperatures 9 4 replicates (each of a different precursor dish)-8 losses (6 of which originated from a single precursor dish and had 87% reduced growth compared to the other replicates of the same isolate in the different environments), resulting in 232 dishes.…”

Section: Methodsmentioning

confidence: 98%

The adaptive potential of a plant pathogenic fungus, Rhizoctonia solani AG-3, under heat and fungicide stress

et al. 2011

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The ability to improve fitness via adaptive evolution may be affected by environmental change. We tested this hypothesis in an in vitro experiment with the plant pathogen Rhizoctonia solani Anastomosis Group 3 (AG-3), assessing genetic and environmental variances under two temperatures (optimal and higher than optimal) and three fungicide concentrations (no fungicide, low and high concentration of a copper-based fungicide). We measured the mean daily growth rate, the coefficient of variation for genotypic (I (G)) and environmental variance (I (E)) in growth, and broad-sense heritability in growth. Both higher temperature and increased fungicide concentration caused a decline in growth, confirming their potential as stressors for the pathogen. All types of standardized variances in growth-I (G), phenotypic variance, and I (E) as a trend-increased with elevated stress. However, heritability was not significantly higher under enhanced stress because the increase in I (G) was counterbalanced by somewhat increased I (E). The results illustrate that predictions for adaptation under environmental stress may depend on the type of short-term evolvability measure. Because mycelial growth is linked to fitness, I (G) reflects short-term evolvability better than heritability, and it indicates that the evolutionary potential of R. solani is positively affected by stress.

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Section: Methodsmentioning

confidence: 98%

The adaptive potential of a plant pathogenic fungus, Rhizoctonia solani AG-3, under heat and fungicide stress

et al. 2011

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“…Water potential has been shown to have significant effects on the activities of plant pathogens (Cook & Baker 1983) such as S. sclerotiorum and Sclerotinia minor (Hao et al 2003), Rhizoctonia solani (Ritchie et al 2006), Fusarium graminearum (Ramirez et al 2004), and Fusarium pseudograminearum (Singh et al 2009). However, the effect of water potential on fungal biocontrol agents has not been widely studied.…”

Section: Introductionmentioning

confidence: 99%

Water potential affects Coniothyrium minitans growth, germination and parasitism of Sclerotinia sclerotiorum sclerotia

2011

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“…Abawi and Grogan (1975), reported similar tolerance levels (−1.0 to −64 bars) of solute potential for the growth and sclerotia production. Also similar values caused a reduction in growth of Macrophomina phaseolina (CervantesGarcia et al, 2003) and Rhizoctonia solani (Ritchie et al, 2006). Most agricultural soils have water potentials greater than the permanent wilting point of higher plants (1.5 MPa) that are mesophytes.…”

Section: Discussionmentioning

confidence: 93%

Effect of Salinity, Temperature and Carbon Source on the Growth and Development of Sclerotia of Sclerotinia sclerotiorum Isolated from Semi-arid Environment

Abdullah¹,

Ali²,

Suleman³

2008

The Plant Pathology Journal

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Studies were conducted to determine the effects of temperature, solute potential and carbon source on the mycelial growth, sclerotia development, and apothecium production of an isolate of Sclerotinia sclerotiorum. Mycelial growth rate was greatest at 25 o C on potato dextrose agar (PDA) medium amended with up to 2% NaCl (ψs ≤ 1.91 MPa) and thereafter, growth rate declined. The least number of sclerotia were produced at 20 o C on both PDA and malt extract agar (MEA) amended with 8% NaCl (ψs=6.62 MPa). With increasing temperature and decreasing solute potential the number and size of sclerotia were significantly reduced. The combined effect of temperature, solute potential and carbon source on sclerotia production were highly significant and had an impact on the development of the rind layer cells of sclerotia. These cells lacked a transparent cell wall which was surrounded by a compact melanized layer, and some of these cells appeared to be devoid of cell contents or were totally vacuolated. The survival of the sclerotia with increase in salinity and temperature appeared to affect melanization and the nature of the rind cells. The observations of this study re-enforces the need for an integrated disease management to control S. sclerotiorum.

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Effects of water potential on mycelial growth, sclerotial production, and germination of Rhizoctonia solani from potato

Cited by 56 publications

References 37 publications

The adaptive potential of a plant pathogenic fungus, Rhizoctonia solani AG-3, under heat and fungicide stress

The adaptive potential of a plant pathogenic fungus, Rhizoctonia solani AG-3, under heat and fungicide stress

Water potential affects Coniothyrium minitans growth, germination and parasitism of Sclerotinia sclerotiorum sclerotia

Effect of Salinity, Temperature and Carbon Source on the Growth and Development of Sclerotia of Sclerotinia sclerotiorum Isolated from Semi-arid Environment

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