Abstract

TRINIDAD-CRUZ, Jesús Rafael; RINCON-ENRIQUEZ, Gabriel; EVANGELISTA-MARTINEZ, Zahaed  and  QUINONES-AGUILAR, Evangelina Esmeralda. Biorational control of Phytophthora capsici in pepper plants using Streptomyces spp. Rev. Chapingo Ser.Hortic [online]. 2021, vol.27, n.2, pp.85-99.  Epub Dec 13, 2021. ISSN 2007-4034.  https://doi.org/10.5154/r.rchsh.2020.06.014.

Pepper wilt, caused by Phytophthora capsici, is one of the main threats faced during pepper production. Therefore, this study aimed to evaluate the effect of Streptomyces spp. in the biological control of P. capsici under in vitro and in vivo conditions. The in vitro antagonistic activity of strains ABV38, ABV39 and ABV45 was examined by means of dual confrontation tests. Broth culture supernatant (BCS) from the growth of the strains was irrigated on pepper plants inoculated with P. capsici CH11 (PC CH11) to evaluate wilt suppression. Molecular identification of the strains was carried out by analyzing the partial sequence of the 16S rRNA gene. Under in vitro conditions, strains ABV38, ABV39 and ABV45 inhibited the mycelial growth of PC CH11 by 51, 28 and 50 %, respectively. In the in vivo evaluation, the BCSs of strains ABV38 and ABV45 showed a wilt suppressive effect, with plant survival of 77 and 94 %, respectively. Strain ABV39 did not show a wilt suppressive effect (0 % survival), and nor did the untreated plants. Molecular identification indicated that strains ABV39, ABV38 and ABV45 belong to the genus Streptomyces, of which ABV38 and ABV45 have potential for biorational control of pepper wilt.

Keywords : actinobacteria; actinomycetes; Capsicum annuum L.; wilt; biological control; oomycete.

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