Abstract
The physiological characteristics of aloe irrigated with brackish water and the relationship with ameliorative effects of silicon (Si) nutrition were studied. Results of cultivation and analysis showed that 2.0mmol·L−1 added Si significantly alleviated growth inhibition and quality reduction of aloe under 100mmol·L−1 NaCl stress; added Si significantly reduced Na+ content while increased K+ content and K+/Na+ ratio of salt stressed aloe plant, especially absorption and translocation selectivity of aloe root to K+ and Na+ were promoted, and ion homeostasis of aloe plant was kept well. Results of cross-sectional X-ray energy dispersive spectrum microanalysis of aloe root and leaf further confirmed the above findings. One of the mechanisms of silicon was its improvement to activity of plasma membrane H+-ATPase, tonoplast membrane H+-ATPase and H+-pyrophosphates of aloe root under salt stress.
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