The influence of exogenous glycine betaine on the physiological characteristics of Bougainvillea spectabilis ‘Crimsonlake’ under NaCl stress

doi:10.14088/j.cnki.issn0439-8114.2025.03.014

Abstract

Abstract: To investigate the impact of exogenous betaine on the physiological characteristics of Bougainvillea spectabilis under NaCl stress and to determine its optimal alleviating concentration, two-year-old potted Bougainvillea spectabilis ‘Crimsonlake’ were used as experimental materials, after simulating salt stress with a 200 mmol/L NaCl solution, exogenous glycine betaine was applied at concentrations of 50, 100, and 150 mmol/L(T1, T2, T3), with water maintenance after NaCl stress (CK) serving as the control group. The effects of different treatments on leaf relative conductivity, malondialdehyde (MDA), proline, and the activities of superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were determined, and the alleviating capacity of betaine at different concentrations against NaCl stress was comprehensively evaluated. The results showed that the application of exogenous glycine betaine after NaCl stress significantly reduced leaf relative conductivity and MDA content, while obviously increasing proline and the activities of POD, SOD, and CAT, indicating that exogenous glycine betaine could effectively alleviate the damage of NaCl stress to Bougainvillea spectabilis ‘Crimsonlake’. Principal component analysis and fuzzy function analysis revealed that the application of 100 mmol/L exogenous glycine betaine was the most effective in alleviating the stress of NaCl on Bougainvillea spectabilis ‘Crimsonlake’.

Key words: Bougainvillea spectabilis ‘Crimsonlake’, NaCl stress, glycine betaine, osmotic adjustment, antioxidant enzyme activity

CLC Number:

HU Ruo-qun, YANG Zhuo-sheng, WANG Zhou-fan, ZHENG Qing-hua, YOU Yong-bin, XIE Ye-long, LAN Kun-lin, CHEN Ying. The influence of exogenous glycine betaine on the physiological characteristics of Bougainvillea spectabilis ‘Crimsonlake’ under NaCl stress[J]. HUBEI AGRICULTURAL SCIENCES, 2025, 64(3): 86-91.

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