Plant growth-promoting effect of Azospirillum sp. strains on rice crop
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Abstract
worldwide. As a sustainable agriculture strategy, to increase
yield and substitute chemical fertilizers, bacteria-based
biofertilizers are now used. The genus Azospirillum has been
proved to promote plant growth, due to its ability to produce
plant growth regulators such as auxins and fix atmospheric
nitrogen. Several Azospirillum strains were selected to test
their capability to produce auxins by Salkowski´s method and
fix atmospheric nitrogen by the acetylene reduction assay.
Positive results were achieved; the strains produced auxins
(2.75-8.6 ìg.mL-1) and were capable of fixing atmospheric
nitrogen (164.17-384.9 nmol.h-1·5 mL-1). An in vitro bioassay
was carried out to assess plant-growth-promotion ability of
strains in rice, with positive results as well. High increases
referring to control treatment were obtained.
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