Comparative Effects of Azospirillum brasilense Sp245 and Pseudomonas aeruginosa PAO1 Lipopolysaccharides on Wheat Seedling Growth and Peroxidase Activity.

Autor: Hernández-Esquivel, Alma Alejandra, Castro-Mercado, Elda, García-Pineda, Ernesto
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Zdroj: Journal of Plant Growth Regulation; Oct2021, Vol. 40 Issue 5, p1903-1911, 9p
Abstrakt: The effects of lipopolysaccharides (LPS) from Azospirillum brasilense Sp245, a plant growth-promoting rhizobacteria, and Pseudomonas aeruginosa PAO1, a pathogenic bacterium, on plant growth and peroxidase (POD) activity were assessed on wheat seedlings. A. brasilense LPS (100 µg/mL) increased total length, and total fresh weight in wheat seedlings 4 days after treatment. P. aeruginosa LPS did not show effect on plant growth. A. brasilense LPS increased root hairs length similar to whole cells, while P. aeruginosa LPS increased root hairs density and slightly root hairs length. Both LPS increased POD activity and hydrogen peroxide (H2O2) content in root; however, the LPS from the pathogenic bacterium generated higher increments. The peroxidase inhibitor salicylhydroxamic acid (SHAM) inhibited plant growth, which was not recovered by the addition of LPS neither A. brasilense nor P. aeruginosa. POD activity stimulated by LPS was calcium-dependent as confirmed by the addition of the calcium channel blocker LaCl3. The results suggest that plant cells sense differentially LPS from beneficial or pathogenic bacteria and that calcium is needed to respond to the presence of both LPS. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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