Torulaspora globosa: rhizosphere yeast promoting lettuce growth on seedlings and under field conditions

Márcia M Rosa Magri,Paloma G Cabrini,Fernando C Sala

doi:10.1590/s0102-053620190303

Márcia M Rosa Magri, Paloma G Cabrini + Show 1 more

Open Access

https://doi.org/10.1590/s0102-053620190303

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Journal: Horticultura Brasileira	Publication Date: Jul 1, 2019
Citations: 6	License type: CC BY 4.0

Affiliation: Universidade Federal de São Carlos

Abstract

ABSTRACT Among soil microorganisms, one group stands out as beneficial to agricultural activities: a plant growth-promoting rhizobacteria (PGPM). These microorganisms support plants through phytohormone production, nutrient provision and plant health maintenance. Among these PGPM, yeasts have a high potential, which is still not very well known.This study aimed to evaluate the effect of inoculation with the rhizosphere yeast Torulaspora globosa (strain 5S55) on development of lettuce (cv. Crocantela). The first research consisted of inoculating seeds with yeast (100 cells/seed), and inoculating seeds, 7 and/or 15 days after emergence (DAE) (1x106 cells/plant). The second one consisted of transplanting seedlings from the first experiment to field. Inoculation of seeds and seedlings provided a significant increase of seedling root dry mass; we observed the significant increase of 27% in productivity of lettuce under field conditions, of shoot fresh mass and a raise of number of leaves per plant. However, studies on inoculation methods, inoculum formulation, cell concentration are essential to optimize the results in growth promotion and to establish technology.

Highlights

Torulaspora globosa: levedura rizosférica promotora de crescimento de alface para produção de mudas e em campo
One group stands out as beneficial to agricultural activities: a plant growth-promoting rhizobacteria (PGPM). These microorganisms support plants through phytohormone production, nutrient provision and plant health maintenance. Among these PGPM, yeasts have a high potential, which is still not very well known.This study aimed to evaluate the effect of inoculation with the rhizosphere yeast Torulaspora globosa on development of lettuce
Inoculation of seeds and seedlings provided a significant increase of seedling root dry mass; we observed the significant increase of 27% in productivity of lettuce under field conditions, of shoot fresh mass and a raise of number of leaves per plant

Summary

Introduction

Torulaspora globosa: levedura rizosférica promotora de crescimento de alface para produção de mudas e em campo. PGPM naturally inhabit soil and plants, show mechanisms to promote plant growth ranging from defending plants against diseases and pests, increasing nutrient uptake, producing phytonutrients, and even inducing plant resistance against biotic and abiotic stresses (Odoh, 2017). Yeast and filamentous fungi are able to produce significant amounts of IAA, being described as microbial groups belonging to PGPM (Shao et al, 2015; Sarabia et al, 2018). The yeast Torulaspora globosa was isolated from sugarcane rhizosphere, and is able to produce plant growth promoters, like IAA, phosphate-solubilizing organic acids (Rosa, 2009; Rosa-Magri et al, 2012; Oliveira et al, 2019), and control phytopathogens (Rosa et al, 2010). Selection and use of plant growth-promoting yeasts can be found in Brazil, and no study on inoculation effect of this species on plants was published

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