The Importance of Zinc-Mobilizing Rhizosphere Bacteria to the Enhancement of Physiology and Growth Parameters for Paddy under Salt-Stress Conditions

[摘要] Rhizosphere bacteria are a group of metal-mobilizing and plant growth-promoting bacteria having the ability to solubilize minerals such as zinc. This plant growth-promoting bacterium, which lives symbiotically in/on the root surface, helps directly or indirectly in promoting plant growth. Zinc is one of the essential micronutrients required for optimum plant growth, and plays a vital role in metabolism. It is necessary in low concentrations, and is critically required for the functioning of several plant physiological processes. Zinc deficiency is the most widespread micronutrient disorder in rice (Oryza sativa). Out of the twenty-five isolates used in this study, two selected ones, namely, Bacillus pumilus and Pseudomonas pseudoalcaligenes, were evaluated for the ability to solubilize zinc and for their growth-promotion efficiency on rice in the greenhouse. Zinc- mobilizing bacteria protect plants from salinity injuries by enhancing their growth-related physiology, such as chlorophyll, carotenoid, and antioxidant enzymes catalase (CAT), peroxidase (PO). Plants inoculated with Zn-mobilizing bacteria (ZMB) also accumulate soluble carbohydrates in leaves under salinity, which helps plants overcome osmotic stress.

[学科分类] 生物科学（综合）

[关键词] Zinc mobilizing bacteria;Paddy;Salinity;Chlorophyll;Carotenoid;Catalase (CAT);Peroxidase (PO).