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Physiological and hormonal responses to Mn stress in the leaves of the hyperaccumulator Celosia argentea Linn.(PDF)

Chinese Journal of Applied & Environmental Biology[ISSN:1006-687X/CN:51-1482/Q]

2021 05
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Physiological and hormonal responses to Mn stress in the leaves of the hyperaccumulator Celosia argentea Linn.
LEI Ling1 LIU Jie1 2? JIANG Pingping1 2 ZHU Zhen2 DING Zhifan1 & JIANG Xusheng1
1 Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China 2 Technical Innovation Center of Mine Geological Environmental Restoration Engineering in Southern Karst Area of Ministry of National Resources, Nanning 530022, China
Mn stress Celosia argentea Linn. leaf endogenous hormone chlorophyll

To study the responses of growth and photosynthetic pigments in the leaves of Celosia argentea Linn. to Mn stress and its regulation mechanism of endogenous hormones, hydroponics experiments were carried out under different concentrations of Mn stress (0.5, 30, 60, and 100 mg/L). C. argentea growth was then observed, and the leaf biomass, leaf area, chlorophyll, and endogenous hormone content were measured. Results showed that the biomass, leaf area, chlorophyll, and carotenoid were significantly different with the increase in Mn concentration (P < 0.05), reached a maximum at 30 mg/L treatment group and then decreased with the increase in Mn concentration. The variation trends of auxin (IAA), Gibberellin 3 (GA3), and zeatin (ZT) were consistent and were significantly increased at 30 mg/L, which were 54.37%, 51.62%, and 18.38% higher than those in the control group. The contents of jasmonic acid (JA) and abscisic acid (ABA) were positively correlated with the concentration of Mn stress; these were 164.11% and 36.96% at 100 mg/L higher than the control. These results indicate that the response of C. argentea leaves to Mn stress is regulated by endogenous hormones. Low concentrations of Mn stress significantly increased the content of IAA, GA3, and ZT in leaves, which promoted C. argentea growth. Under a high concentration of Mn stress, the content of ABA and JA increased significantly and inhibited its growth.


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Last Update: 2021-10-25