Australasian Plant Pathology

, Volume 42, Issue 4, pp 421–430 | Cite as

Greater Botryosphaeriaceae diversity in healthy than associated diseased Acacia karroo tree tissues

  • Fahimeh Jami
  • Bernard Slippers
  • Michael J. Wingfield
  • Marieka Gryzenhout
Article

Abstract

Botryosphaeriaceae are common endophytes of trees. Some species are also known to be pathogens. It is, therefore, assumed that endophytic Botryosphaeriaceae are often involved in general die-back diseases. Here we test this assumption in severe branch die-back observed on Acacia karroo trees in the Pretoria area of South Africa. The presence of the Botryosphaeriaceae was compared between healthy and diseased tissue on the same trees. Eight Botryosphaeriaceae species were isolated from die-back and healthy branches. Of these, six species, namely Tiarosporella urbis-rosarum, Diplodia allocellula, Phaeobotryosphaeria variabilis, Dothiorella brevicollis and Neofusicoccum vitifusiforme were obtained from healthy tissues, and only two species, Dothiorella dulcispinae and Spencermartinsia pretoriensis, were exclusively found in die-back branches. Spencermartinsia viticola was found in both tissue types and this fungus was also the most commonly isolated species from both healthy and die-back samples. Results of pathogenicity trials showed highly variable results for the isolated species and that the two species associated only with die-back symptoms, were weakly pathogenic. These results suggest that the Botryosphaeriaceae found in these trees were not directly associated with the die-back symptoms, despite their diversity and common occurrence in these tissues. The situation is different in other tree systems where dominant species, often with wide host ranges, have been shown to be involved in die-back diseases. This indicates the importance of characterizing the unique aspects of each tree disease system.

Keywords

Botryosphaeriaceae Acacia karroo Die-back Diversity South Africa 

Notes

Acknowledgments

We thank Ms. Kerry-Anne Pillay and Mr. James Mehl for assistance in collecting the samples, Dr. Mike van der Linde and Mr. Andre Swanepoel for providing help and advice with the statistical analyses. Members of the Tree Protection Cooperative Programme (TPCP), the DST/NRF Centre of Excellence in Tree Health Biotechnology (CTHB) and the University of Pretoria, South Africa, are acknowledged for financial support.

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Copyright information

© Australasian Plant Pathology Society Inc. 2013

Authors and Affiliations

  • Fahimeh Jami
    • 1
  • Bernard Slippers
    • 2
  • Michael J. Wingfield
    • 1
  • Marieka Gryzenhout
    • 3
  1. 1.Department of Microbiology and Plant Pathology, Forestry & Agricultural Biotechnology Institute (FABI)University of PretoriaPretoriaSouth Africa
  2. 2.Department of Genetics, Forestry & Agricultural Biotechnology Institute (FABI)University of PretoriaPretoriaSouth Africa
  3. 3.Department of Plant SciencesUniversity of the Free StateBloemfonteinSouth Africa

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