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

Author

Willi, Yvonne, Frank, Aline, Heinzelmann, Renate, Kälin, Andrea, Spalinger, Lena, Ceresini, Paulo, Willi, Yvonne, Frank, Aline, Heinzelmann, Renate, Kälin, Andrea, Spalinger, Lena, and Ceresini, Paulo

Abstract

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

Published
2018

7. Genecology of Norway spruce, silver fir, and European beech in Switzerland: Are current populations adapted to future climates?

Author

Frank, Aline Daria, Widmer, Alex, Heiri, Caroline, Glenn T. Howe, and Fady, Bruno

Subjects
ECOLOGICAL GENETICS + GENOTYPE ENVIRONMENT INTERACTIONS, ABIES (BOTANY), ÖKOLOGISCHE GENETIK + GENOTYP-UMWELT WECHSELWIRKUNGEN, PICEA (BOTANIK), ABIES (BOTANIK), FAGUS (BOTANIK), ADAPTATION + LEBENSFORMEN (PFLANZENÖKOLOGIE), GLOBAL CHANGE + KLIMAERWÄRMUNG (KLIMATOLOGIE), RESISTENZ UND VITALITÄT VON KULTURPFLANZEN (PHYTOMEDIZIN), PICEA (BOTANY), FAGUS (BOTANY), ADAPTATION + LIFE FORMS (PLANT ECOLOGY), GLOBAL CHANGE + GLOBAL WARMING (CLIMATOLOGY), RESISTANCE AND VITALITY OF CULTIVATED PLANTS (PLANT PATHOLOGY), Agriculture, ddc:580, Botanical sciences, ddc:630
Published
2016

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

Author

Willi, Yvonne, Frank, Aline, Heinzelmann, Renate, Kälin, Andrea, Spalinger, Lena, Ceresini, Paulo, Willi, Yvonne, Frank, Aline, Heinzelmann, Renate, Kälin, Andrea, Spalinger, Lena, and Ceresini, Paulo

Abstract

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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