Growth promotion potential ofBacillusspp. isolates on two tomato (Solanum lycopersicumL.) varieties in the West region of Cameroon

Author:

Kouam Idriss Djoko1,Mabah Joseline1,Germain Ntsoli Pierre1,Tchamani Laverdure2,Yaouba Aoudou1,Katte Bridget3,Bitom Dieudonné4

Affiliation:

1. Department of Agriculture, Faculty of Agronomy and Agricultural Sciences, University of Dschang , P.O. BOX 222 , Dschang , Cameroon

2. Department of Biochemistry, Faculty of Sciences, University of Dschang , P.O. BOX 67 , Dschang , Cameroon

3. Department of Animal Production, Faculty of Agronomy and Agricultural Sciences, University of Dschang , P.O. BOX 122 , Dschang , Cameroon

4. Department of Soil Science, Faculty of Agronomy and Agricultural Sciences, University of Dschang , P.O. BOX 222 , Dschang , Cameroon

Abstract

AbstractInoculation of plants with plant growth-promoting bacteria (PGPB) is an ecological approach to improve plants growth and yield. The objective of this study was to screen native PGPBs in tomato root rhizosphere and evaluate their performance in germination and growth of seedlings in the greenhouse in the western region of Cameroon. Isolates were selected based on their ability to solubilize phosphate, produce indole-3-acetic acid, and improve seed germination and seedling growth under laboratory conditions. Following this screening, eight bacteria were selected (S1, S4, S13, S14, S16, B9, B11, and B15) to assess their performance on seedling growth in greenhouse. Seeds of two tomato varieties (one improved, Raja, and the local one, Foolewouh) were used in this study. The experiment was performed in sterilized and non-sterilized soils. Phylogenetic analysis of the 16S rRNA sequence showed that these bacteria belong to the genusBacillus, includingB. thuringiensis,B. cereus,B. pacificus, andB. aerius. The bacterial performance depended on the variety and conditions of soil treatment. Isolates improved seed germination (up to 31.93%) and seeding strength (up to 78.59%)in vitro. In greenhouse, inoculation with PGPB significantly increased stem height, root length, and weight of fresh and dry stems and roots. Raja variety was more sensitive to bacteria and performed better than the Foolewouh variety. Bacterial isolates on sterilized soil allowed to better seedling growth compared to non-sterilized soil. The study showed thatB. thuringiensis(strain B9),B. pacificus(strain B11), andBacillussp. (strain B15) can be used as inoculant formulations to improve seedling growth of tomato plant.

Publisher

Walter de Gruyter GmbH

Subject

General Agricultural and Biological Sciences

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