Inoculation of Schizolobium parahyba with Mycorrhizal Fungi and Plant Growth-Promoting Rhizobacteria Increases Wood Yield under Field Conditions.

Martha V T Cely,Marco A Siviero,Igor M O Dos Santos,Vanessa F Freitas,Janaina Emiliano,Galdino Andrade,André R Barazetti,Erika T Goya,Flávia R Spago,Gustavo De Souza Lamberti,Admilton G De Oliveira

doi:10.3389/fpls.2016.01708

Martha V T Cely, Marco A Siviero + Show 9 more

Open Access

https://doi.org/10.3389/fpls.2016.01708

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Abstract

Schizolobium parahyba var. amazonicum (Huber ex Ducke) occurs naturally in the Brazilian Amazon. Currently, it is being planted extensively because of its fast growth and excellent use in forestry. Consequently, there is great interest in new strategies to increase wood production. The interaction between soil microorganisms and plants, specifically in the roots, provides essential nutrients for plant growth. These interactions can have growth-promoting effects. In this way, this study assessed the effect of the inoculation with arbuscular mycorrhizal fungi (AMF) and plant growth-promoting rhizobacteria (PGPR) on growth of S. parahyba var. amazonicum under field conditions. We used two native species of arbuscular mycorrhizal fungi, Claroideoglomus etunicatum (Ce), and Acaulospora sp. (Ac); two native strains of Rhizobium sp. (Rh1 and Rh2); and a non-native strain of Burkholderia sp. Different combinations of microorganisms were supplemented with chemical fertilizers (doses D1 and D2) in two planting methods, seed sowing and seedling planting. In seed sowing, the results showed that treatments with Ce/Rh1/Fertilizer D2 and Ac/No PGPR/Fertilizer D2 increased wood yield. In seedling planting, two combinations (Ac/Rh2/Fertilizer D1 and Ac/Rh1/Fertilizer D1) were more effective in increasing seedling growth. In these experiments, inoculation with AMF and PGPR increased wood yield by about 20% compared to the application of fertilizer alone.

Highlights

The negative impacts of agro-industrial development and wood exploitation in native forest areas have encouraged the development of projects focused on reforestation with homogeneous stands or intercropped species of rapid growth and high commercial value
The interaction between plant growth-promoting rhizobacteria (PGPR) and fertilizer effect resulted in increased diameter at breast height (DBH) (Table 2)
BIO was significantly enhanced by both arbuscular mycorrhizal fungi (AMF) C. etunicatum and Acaulospora sp. at 480 days (Figure 1A)

Summary

Introduction

The negative impacts of agro-industrial development and wood exploitation in native forest areas have encouraged the development of projects focused on reforestation with homogeneous stands or intercropped species of rapid growth and high commercial value. These strategies are directed at degraded areas with the objective of forest restoration or wood production. Amazonicum (Huber ex Ducke), belonging to the family Leguminosae and subfamily Caesalpinioideae, is a non-nodulating species native to the Amazon It is considered an ecologically and economically important species due to its significant wood potential; its commercial potential has been exploited since the 1970s. The quality of its wood is suitable for furniture and plywood production

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