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Microscopy of some interactions between Botryosphaeriaceae species and grapevine tissues

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Abstract

This study investigated the endophytic interactions between Botryosphaeriaceae pathogens and their woody hosts and the role of wounds in development of infection of green tissues. At 2 and 3 months after inoculating trunks of 2 year old grapevine plants with Neofusiciccum australe, N. luteum, N. parvum or Diplodia mutila, sap samples provided no evidence of pathogen propagules, indicating that the dieback symptoms observed at a distance from the lesions on inoculated sections of the trunks were not due to internally transmitted propagules. However, longitudinal sections cut from beyond trunk lesions showed hyphae of the four fungi grew within xylem vessels, which was consistent with endophytic fungal development observed in previous experiments. When conidia of N. luteum were inoculated onto green shoots and leaves of potted grapevines, which were wounded or non-wounded, and excised or attached to living plants, scanning electron microscope studies showed that conidial development was significantly affected by the condition of tissues. On detached and wounded leaf and shoot surfaces, most conidia had germinated by 3 h after inoculation and by 24 h had developed into networks of mycelium. On attached and wounded leaf and shoot surfaces it took 24 h for most conidia to germinate. However, when green tissues were attached and non-wounded, conidia did not adhere or germinate, all conidia being shed from the tissues within 24 h. These studies have provided explanations for phenomena observed during infection studies and have demonstrated that the pathogen-host interactions are complex, warranting further examination of the physiology of the interactions.

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Acknowledgments

We are grateful to New Zealand Wine-growers and Lincoln University for funding this research, to Neil Andrews for his shilled help with viewing the specimens with scanning electron microscopy and to Brent Richards of the Lincoln University for maintaining the grapevine plants during the course of the experiments.

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Correspondence to M. V. Jaspers.

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Amponsah, N.T., Jones, E.E., Ridgway, H.J. et al. Microscopy of some interactions between Botryosphaeriaceae species and grapevine tissues. Australasian Plant Pathol. 41, 665–673 (2012). https://doi.org/10.1007/s13313-012-0159-x

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  • DOI: https://doi.org/10.1007/s13313-012-0159-x

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