Natives helping foreigners?: The effect of inoculation of poplar with patagonian beneficial microorganisms

Abstract

Inoculation with microorganisms represents an opportunity to enhance tree production, directly affecting plant growth or survival at planting. The aim of the present study was to evaluate the effect of mixed inoculation with native mycorrhizae, two yeasts and one endophytic bacterium, on the growth of two poplar clones commonly used in Patagonia, Argentina. Yeasts and bacteria were selected base on their ability to produce IAA and siderophores, as well as P solubilization in-vitro. A greenhouse trial was performed using hardwood cuttings of Populus nigra 'Italica' and Populus trichocarpa 'SP1456'. Only yeasts modified growth traits, in a host-related response: Tausonia pullulans reduced the root/shoot ratio in P. nigra, and Candida saitoana and increased shoot dry biomass in P. trichocarpa. All plants presented arbuscular mycorrhizal colonization but ectomycorrhizae were absent. Two types of arbuscular mycorrhizal colonization were observed, one of them similar to Glomus tenue. We found a tendency for a higher percentage of arbuscular mycorrhizal colonization when plants were inoculated with T. pullulans. The used of native yeast along with mycorrhizal inocula appears to be a promising tool to improve poplar forestry.

Nothofagus pumilio forest affected by recent tephra deposition in northern Patagonia. I- Environmental traits influencing seedling growth

“…These results are in agreement with previous studies carried out in Patagonia, which reported that some native forest species, such as Araucaria araucana, Austrocedrus chilensis and different Nothofagus species, are capable of colonizing and growing rapidly on tephra deposits (González et al, 2014), which in several cases can be helped by microbial interactions at soil-root level (Marín et al, 2016;Mestre et al, 2017). For example, 17 months after the eruption of Hudson volcano, Vogel (1996) described the massive establishment of N. pumilio seedlings growing directly on the tephra.…”

Effect of yeast and mycorrhizae inoculation on tomato production under normal and water stress conditions

“…This indicates that increased AM colonization, in this case, the addition of F. mosseae, can positively influence productive parameters, both under normal irrigation conditions and in situations of water shortage. The relationship between Patagonian yeasts and native mycorrhizal colonization has been reported in studies such as Mestre et al (2017), where a tendency of increased colonization of native mycorrhizae was observed in poplars inoculated with the native yeast Tausonia pullulans. Fracchia et al (2003) recorded an increase in mycorrhizal colonization in soybean (Glycine max) and red clover roots after double inoculation of F. mosseae and Rhodotorula mucilaginosa, when the yeast was inoculated before F. mosseae.…”

Serratia strains isolated from the rhizosphere of raulí ( Nothofagus alpina ) in volcanic soils harbour PGPR mechanisms and promote raulí plantlet growth

“…Currently it is well known that IAA production is widespread among soil bacteria that inhabit the rhizosphere of plants, and IAA production promotes growth and development (Egamberdieva et al, 2017;Viscardi et al, 2016); thus, this trait was our principal criterion for selection. Others have also noted that IAA production can be used for the selection of effective plant growth promoting rhizobacteria (Etesami et al, 2015;Mestre et al, 2017). The main IAA-producing bacteria belonging to the Aeromonas, Azotobacter, Bacillus, Burkholderia, Enterobacter, Pseudomonas, Rhizobium and Serratia genera have been isolated from different rhizospheric soils (Egamberdieva et al, 2017;Koo and Cho, 2009;Martinez-Viveros et al, 2010).…”