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Advisor(s)
Abstract(s)
Soil salinization and fresh water scarcity are amongst the main environmental/agricultural problems,
with serious consequences to plant productivity. Amelioration with microorganisms can enhance plant
performance under salt conditions. The aim of this work was to evaluate the role of beneficial
rhizospheric microorganisms on the growth of sunflower plants irrigated with salinized water with
particular attention to nutrient balance and biochemical responses. Sunflower seedlings were inoculated
with the arbuscular mycorrhizal fungi Rhizophagus irregularis, the rhizobacteria Chryseobacterium humi
ECP37T, or the bacterial endophyte Ochrobacterium haematophilum ZR3-5, and with a mixed inocula of
those microorganisms. Plant growth, nutrient accumulation and lipid peroxidation in plant tissues, and
the activity of soil enzymes, were evaluated. Irrigating sunflower plants with saline water resulted in
decreases in growth and negative effects in salt stress markers, however the application of bioinoculants
enhanced biomass production and accumulation of K+, Mg2+, Ca2+, N and P, reduced Na+ levels in tissues
and increased plant antioxidative response.
This study contributes to devise inoculation strategies for sunflower cultivation in areas prone to
salinization.
Description
Keywords
Salt stress Plant growth promoting rhizobacteria Endophytic bacteria Arbuscular mycorrhizal fungi Sunflower Irrigation water
Citation
PEREIRA, Sofia I. A.; MOREIRA, Helena; ARGYRAS, Konstantinos; CASTRO, Paula M. L.; MARQUES, A. P. G. C. - Promotion of sunflower growth under saline water irrigation by the inoculation of beneficial microorganisms. Applied Soil Ecology. ISSN 0929-1393. Vol. 105 (2016), p. 36-47
Publisher
Elsevier