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Aristide D, Martial TTP, Ruth NNE, Grace LB, Ebenezer FT, Flore MPT, Thaddee B. Effects of a Powder Formulation of Streptomyces cameroonensis on Growth and Resistance of Two Cocoa Hybrids from Cameroon against Phytophthora megakarya (Causal Agent of Black Pod Disease). J Microbiol Biotechnol 2022; 32:160-169. [PMID: 34954698 PMCID: PMC9628838 DOI: 10.4014/jmb.2110.10006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Revised: 12/17/2021] [Accepted: 12/20/2021] [Indexed: 12/15/2022]
Abstract
In the present study we evaluated the efficacy of a bioformulation of Streptomyces cameroonensis for control of black pod disease in cocoa and enhancement of seedling growth. The formulation developed using talc powder and cassava starch as carriers showed high shelf-life of 1.07 × 106 CFU/g after six months storage at 4°C. The formulation was tested for inhibition of spore germination in Phytophthora megakarya and showed 100% inhibition at 10% (w/v) of formulation. To determine the efficacy of the formulation, we performed an in planta assay in the greenhouse on two hybrids of cocoa seedlings, the tolerant SNK413 × (♂) T79/467 and the susceptible UPA 134× (♂) SCA 12. Detached leaf assay showed a significant reduction in the disease severity index of about 67% for the tolerant hybrid and 55% for the susceptible hybrid compared to non-treated plants. A significant enhancement in stem length, leaf surface area and root weight was observed. Analysis of biochemical markers of defense showed a significant increase in total polyphenol, flavonoid, and total protein contents. There was also significant upregulation of PR-proteins such as chitinases, peroxidases and β-1, 3-glucanases following treatment of both tolerant and susceptible hybrids, though with a higher level of synthesis in the tolerant hybrids. A significant increase was also observed in polyphenol oxidase activities in plants treated with the formulation. This work demonstrated the stability and effectiveness of the S. cameroonensis powder formulation in suppressing black pod disease in cocoa and subsequently enhancing the growth of seedlings.
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Affiliation(s)
- Dzelamonyuy Aristide
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Tene Tayo Paul Martial
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Ngotcho Ngassam Esther Ruth
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Lele Brenda Grace
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Foka Tatiekam Ebenezer
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Magni Pacha Tatiana Flore
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon
| | - Boudjeko Thaddee
- Laboratory of Phytoprotection and Plant Valorization, Biotechnology Center, University of Yaoundé I P.O. Box 17673 Etetak-Yaoundé, Cameroon,Department of Biochemistry, Faculty of Science, University of Yaoundé 1, P.O. Box 812, Yaoundé, Cameroon,Corresponding author Phone/Fax : 699086703 E-mail:
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