Cytological aspects of compatible and incompatible interactions between cashew (Anacardium occidentale L.) seedlings and isolates of Colletotrichum gloeosporioides (Penz.) complex

A - Papers appearing in refereed journals

Queijeiro Lopez, A. M. and Lucas, J. 2021. Cytological aspects of compatible and incompatible interactions between cashew (Anacardium occidentale L.) seedlings and isolates of Colletotrichum gloeosporioides (Penz.) complex. Revista Brasileira de Fruticultura. 43 (2), pp. e-701. https://doi.org/10.1590/0100-29452021701

AuthorsQueijeiro Lopez, A. M. and Lucas, J.
Abstract

A strategy in the control anthracnose of cashew (Anacardium occidentale L.) is the management of crop phenology and defense mechanisms of this host. In previous studies, under
controlled conditions, the seedling reactions of 5 cashew clones (CAP-14, CCP-06, CCP-09, CCP76 and CCP-1001) to 36 isolates of Colletorichum gloeosporioides Penz. complex (LARS- 905 to 940) was evaluated. However, good field management requires information about the infection process. This research aimed to clarify cytophysiological aspects of three compatible interactions of this pathosystem (isolates LARS-905 and 910 × CCP-76; LARS-910 × CCP-1001) and an incompatible one (LARS-905 × CCP-1001), using infected leaves/stems and microscopy (light, scanning and transmission electron). No significant differences were found prior to penetration. In the susceptible combinations, 36-66 h after inoculation, a thin primary hypha (TPH) formed in the invaded epidermal cell, widening as a large primary hypha (LPH), which filled the cell lumen simultaneously with accumulation of of yellow-brown lignopolysaccharides. Then, a thin secondary hypha (TSH) developed from the LPH, penetrating adjacent cells before the first became necrotic. In the incompatible interaction, the response of the first invaded cell was faster and more intense, with formation of papilla and lignopolysaccharide-protein-silicon complex usually blocking the pathogen.

KeywordsAnthracnose; Defense mechanisms; Hemibiotrophic fungus; Papilla; Resistance
Year of Publication2021
JournalRevista Brasileira de Fruticultura
Journal citation43 (2), pp. e-701
Digital Object Identifier (DOI)https://doi.org/10.1590/0100-29452021701
Open accessPublished as bronze (free) open access
Publisher's version
Output statusPublished
Publication dates
Online28 May 2021
Publication process dates
Accepted09 Feb 2021
PublisherSociedade Brasileira de Fruticultura
ISSN0100-2945

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