ORIGINAL ARTICLE
 
HIGHLIGHTS
  • Trichoderma asperellum decreased mycelial growth of L. theobromae and P. kimberleyense.
  • The best condition for the production of T. asperellum filtrates with inhibitory action was pH 5, 100 rpm of agitation, 50 g · l–1 of sucrose and 105 spores · ml–1.
  • T. asperellum isolates produced chitinase and compounds with biocontrol potential.
KEYWORDS
TOPICS
ABSTRACT
Lasiodiplodia theobromae and Pseudofusicoccum kimberleyense are pathogens causing trunk canker in Carya illioniensis and there are still no reports of effective forms of control. However, biological control is a promising measure. The objective of this work was to isolate, identify and evaluate the action of Trichoderma spp. in the in vitro control of L. theobromae and P. kimberleyense and to identify the compounds produced by the antagonist. Trichoderma spp. was identified by molecular technique and morphologically characterized. The antagonistic action of T. asperellum isolates (obtained from the rhizospheric soil, and of an isolate obtained from a commercial formulation) was evaluated by pairing cultures and volatile metabolites on L. theobromae and P. kimberleyense. Optimization of the cultivation method of T. asperellum was carried out and the compounds produced by the antagonist were identified by gas chromatography. Isolates obtained from the soil were identified as T. asperellum and decreased mycelial growth of L. theobromae and P. kimberleyense in the crop pairing test (48.98% S6 x Qt), as well as by volatile metabolites (29.85% SM21 x TR4). The cultivation conditions that generated the filtrates with the greatest antifungal action used 20 g · l–1 of corn maceration water, yeast extract 7.5 g · l–1, pH 5, agitation 100 rpm, sucrose 50 g · l–1, inoculum concentration 105 spores · ml–1. Among the identified compounds, some stood out for having bioactive action, such as pyran derivatives, celidoniol, deoxy, pentadecanoicacid, 2,3-dihydro-3,5-dihydroxy-6-methyl, propanoicacid, 1-methylethyl ester and 9-octadecenoic acid. The T. asperellum isolates showed potential for biocontrol in vitro, acting by different mechanisms.
ACKNOWLEDGEMENTS
The authors wish to thank Coordination for the Improvement of National Council of Technological and Scientific Development (CNPq) for the scholarships and for financial support to Marlove Muniz, Marcio Mazutti and Giovani Zabot who express their thanks for the productivity grants.
RESPONSIBLE EDITOR
Iwona Adamska
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
 
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