Interaction of Capnodium alfenasii with extrafloral nectaries of Azadirachta indica.

Autor: Mesquita NLS; Department of Plant Science and Animal Science, Universidade Estadual Do Sudoeste da Bahia, Vitória da Conquista, Bahia, Brazil., Leitão CAE; Department of Natural Sciences, Universidade Estadual Do Sudoeste da Bahia, Vitória da Conquista, Bahia, Brazil. candreel@yahoo.com.br., de Souza Soares PP; Department of Plant Science and Animal Science, Universidade Estadual Do Sudoeste da Bahia, Vitória da Conquista, Bahia, Brazil., de Novaes QS; Department of Plant Science and Animal Science, Universidade Estadual Do Sudoeste da Bahia, Vitória da Conquista, Bahia, Brazil., de Melo MP; Center for Agricultural Sciences, Universidade Federal Do Piauí, Teresina, Piauí, Brazil., Bezerra JL; Department of Mycology, Universidade Federal de Pernambuco, Recife, Pernambuco, Brazil., Santos A; Department of Plant Science and Animal Science, Universidade Estadual Do Sudoeste da Bahia, Vitória da Conquista, Bahia, Brazil.
Jazyk: angličtina
Zdroj: Protoplasma [Protoplasma] 2024 Aug 07. Date of Electronic Publication: 2024 Aug 07.
DOI: 10.1007/s00709-024-01977-4
Abstrakt: Sooty moulds are saprophytic epiphytic fungi that grow mostly on insect secretions, but they can also be associated with plant secretions. In this study, we aimed to describe de interaction of Capnodium alfenasii sooty mould with the extrafloral shoot nectaries of Azadirachta indica. Anatomical and histochemical studies were carried out on serial sections of extrafloral shoot nectaries of A. indica without and with C. alfenasii infestation. The total soluble sugar content of the secreted nectar was determined, and the conidial germination of the fungus in distilled water and in dextrose and nectar solutions was evaluated. The shoot nectaries of A. indica are elongated structures that occur in pairs near the base of the petiole. The exuded nectar contains an average of 534.8 µg of total soluble sugars per µL of nectar and provides ideal conditions for conidial germination and fungal growth. C. alfenasii hyphae grow on the nectary, penetrate through breaks in the cuticle, travel under the cuticle and penetrate the secretory tissue by inter- and intracellular routes. The present report is the first to describe the interaction of C. alfenasii with the A. indica nectary, including the penetration of hyphae into nectariferous tissues and the plant defence mechanisms.
(© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Austria, part of Springer Nature.)
Databáze: MEDLINE
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