PLANT GROWTH-PROMOTING MICROBIAL INOCULANT FOR Schizolobium parahyba pv. parahyba

Priscila Jane Romano De Oliveira Gonçalves,Martha Torres Cely,Admilton Gonçalves Oliveira,Miguel Perez Navarro,Nathaly Andreoli Chiari,Alex Carneiro Leal,Vanessa Fogaça Freitas,Galdino Andrade

doi:10.1590/0100-67622015000400008

Priscila Jane Romano De Oliveira Gonçalves, Martha Torres Cely + Show 6 more

Open Access

https://doi.org/10.1590/0100-67622015000400008

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Abstract

ABSTRACTSchizolobium parahyba pv. amazonicum (Huber ex Ducke) Barneby (paricá) occurs naturally in the Amazon and is significant commercial importance due to its rapid growth and excellent performance on cropping systems. The aim of this paper was to evaluate a microbial inoculants such as arbuscular mycorrhiza fungi (AMF) and Rhizobium sp. that promote plant growth. The inocula was 10 g of root colonized and spores of Glomus clarum and/or 1 mL of cell suspension (107 CFU/mL) of Rhizobium sp. and/or 100 g of chemical fertilizer NPK 20-05-20 per planting hole. The experimental design was complete randomized blocks with five replications and eight treatments (n = 800). Plant height, stem diameter and plant survival were measured. The results were tested for normality and homogeneity of variances and analyzed by ANOVA and Tukey test (p < 0.05). Rhizobium sp and AM fungi showed no effect on plant growth. Environmental factors probably influenced the effectiveness of symbiosis of both microorganisms and plant growth. The chemical fertilizer increased S. parahyba growth. During the first 120 days plants suffered with drought and frost, and at 180 days plants inoculated with microorganism plus chemical fertilizer showed higher survival when compared with control. The results showed that the microbial inoculants used showed an important role on plant survival after high stress conditions, but not in plant growth. Also was concluded that the planting time should be between November to December to avoid the presence of young plants during winter time that is dry and cold.

Highlights

The drastic losses of original native forests in the Northwest region of Parana state in Southern Brazil occurred along the last century during the process of colonization
The inoculation of legume plants with plant growth promoting rhizobacteria (PGPR) and AM fungi can increase plant growth (ABDALLA et al, 2000; MARIN et al, 2010), and there are several reports that show a beneficial effects in the interaction of arbuscular mycorrhiza fungi (AMF) and diazotrophic bacteria (BAREA et al, 2005; RAIMAM et al.,2007; SALA et al, 2007; MIYAUCHI et al, 2008).The aim of this work was to evaluate the contribution of the microbial inoculants Glomus clarum and Rhizobium sp. in promote plant growth of S. parahyba under field conditions
The survival of control plant was very low after 240 days (16.7%) and plants inoculated with Rhizobium sp. and G. clarum presented 40 and 36.7% of plants survival, respectively

Summary

Introduction

The drastic losses of original native forests in the Northwest region of Parana state in Southern Brazil occurred along the last century during the process of colonization. From 100% of forest cover in the 19th century, only 5% of the Atlantic Forest was remnants and many reforestation projects in degraded areas were carried with native trees (IPARDES, 2010). S. parahyba is a pioneer tree that occurs naturally in Atlantic Forest (LORENZI, 1992) in the states of Bahia, Espírito Santo, Paraná, Rio Grande do Sul, Santa Catarina and São Paulo (CARVALHO, 2005). This is considered an ecologically and economically important species due to its significant wood yield potential (BORTOLETTO JÚNIOR; BELINI, 2002)

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