Abstract
The aim of the study was to study how Azospirillum brasilense influences the quality and growth of garlic cv "Bianco Polesano" An experiment was carried out with 2 treatments: 1) soil inoculated with Azospirillum brasilense (ALO1 strain of the company AZ BEL) and fertilized; 2) soil without Azospirillum, irrigated with water and fertilizer (control). The test showed a significant increase in the agronomic parameters analysed in plants treated with Azospirillum. In fact, all garlic bulbs in which the alpha proteobacterium has been inoculated have shown a significant increase in the weight of the bulbs, the diameter of the bulbs and the weight of the roots. This alpha proteobacterium can also have a positive effect on the solubilization and absorption of minerals present in the soil, especially iron, promoting plant growth, improving product quality, stimulating the hormones GA and IAA and the synthesis of vitamins such as B1, B3, B5. Furthermore, plants treated with Azospirillum brasilense are more resistant to biotic and abiotic stresses of various kinds.
Highlights
Azospirillum is a kind of bacteria that have the ability to colonize both the rhizosphere and the intercellular spaces of the root
Plant growth The test showed a significant increase in the agronomic parameters analysed in plants treated with Azospirillum brasilense
Researchers such as Bárbaro et al (2008) [16] indicate the possibility of selecting strains suitable for local soil and climate conditions, as well as the crops and their cultivars used in each region [17,18,19,20] In this test, garlic bulbs treated with Azospirillum brasilense showed a significant increase in diameter, bulb weight and root weight
Summary
Azospirillum is a kind of bacteria that have the ability to colonize both the rhizosphere and the intercellular spaces of the root. Represents one of the bacteria plant growth promoters (PGPB) most studied, with its 19 described species. It has the ability to promote plant growth through different mechanisms: biosynthesis and release of amino acids, indoloacetic acid, cytokinins, gibberellins and other polyamines, promoting root growth and, increasing the absorption of water and nutrients by plants [3]. Azospirillum has the ability to fix atmospheric nitrogen (N2) through the process of biological nitrogen fixation and can contribute directly to making N available to non-leguminous species. The use of plant growth promoting bacteria (PGPB) can be an alternative to reduce the use of chemical fertilizers [4]
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