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BMC Plant Biology
Springer
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| Abstract: |
In light of the detrimental consequences of climate change and global warming, drought (water deficit) has
emerged as a major abiotic stressor that adversely affects plant development, productivity, and sustainable
agriculture globally. Vicia faba L. (faba bean), a highly nutritious leguminous crop, is especially vulnerable to water
scarcity. As a possible solution, this study highlighted the recent advances in plant stress physiology regarding
the role of kinetin (20 mg/L) and arbuscular mycorrhizal (AM) fungi in enhancing V. faba resilience to drought
(30% water holding capacity) with emphasis on their growth, physiological and biochemical mechanisms. Under
controlled conditions, drought markedly decreased plant growth, photosynthetic pigments (chlorophyll a + b
and total pigments), and relative water content (RWC), while increasing stress markers (hydrogen peroxide and
electrolyte leakage). Nevertheless, these negative effects were considerably lessened by AM fungi and kinetin
application. Their application led to the improvement of V. faba growth parameters, maintaining cellular hydration
(high RWC), higher activity of antioxidant enzymes (superoxide dismutase, catalase, peroxidase, ascorbate
peroxidase, and polyphenol oxidase) and organic adjustments which include total soluble protein, proline and total
soluble carbohydrate. The most surpassing effect is that AM fungal inoculation enhanced the soil-rich glomalin
content, both easily and total extractable. Regarding the effect of drought stress on mycorrhizal colonization;
microscopic observation showed a noticeable reduction in the formation of arbuscules and vesicles under drought.
Although reduced colonization, AM fungi can nevertheless benefit host plants. These findings highlight the
potential of integrating AM fungal inoculation or kinetin treatment as an eco-friendly strategy to enhance drought
resilience in V. faba cultivation.
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