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Effect of Brassinolide on Stoichiometric Stability Characteristics of Tall Fescue under Drought Stress in Ecological Restoration

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  • Roujia Kang

    (College of Biological & Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China)

  • Mingyi Li

    (Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China)

  • Shiwei Guo

    (Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China)

  • Dong Xia

    (College of Hydraulic & Environmental Engineering, China Three Gorges University, Yichang 443002, China)

  • Liming Liu

    (Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China)

  • Wenhao Dong

    (Hubei Runzhi Ecological Technology Co., Ltd., Yichang 443002, China)

  • Wennian Xu

    (Key Laboratory of Geological Hazards on Three Gorges Reservoir Area, Ministry of Education, China Three Gorges University, Yichang 443002, China)

  • Yucai Lv

    (College of Biological & Pharmaceutical Sciences, China Three Gorges University, Yichang 443002, China)

Abstract

In order to investigate the effects of brassinolide (BR) on the ecological stoichiometric characteristics and internal stability of plants in slope ecological protection under different drought conditions, the biomass, proline content, nutrient content, and internal stability of tall fescue ( Festuca arundinacea ) in three stress periods were analyzed by weighing water control method, with three drought degrees (75% ± 5%), mild drought (55% ± 5%) and severe drought (35% ± 5%) and four BR concentrations (0 mg/L, 0.05 mg/L, 0.2 mg/L and 0.5 mg/L). The results showed that drought stress resulted in a decrease in plant biomass and nutrient content, and there were differences in carbon, nitrogen and phosphorus contents and their stoichiometric ratios in different organs. Spraying suitable concentration of BR could alleviate plant nutrient loss and promote nutrient accumulation of the tall fescue. Under normal water spraying conditions 0.2 mg/L, under mild and severe drought conditions with spraying of 0.5 mg/L BR, it is most suitable for the nutrient accumulation in tall fescue. The tall fescue showed high sensitivity to exogenous BR input, and the internal stability of the underground part of the tall fescue increased clearly. BR is propitious to the synthesis of proline and enhances the drought resistance of plants. According to stoichiometric characteristics, BR can improve the nitrogen and phosphorus utilization efficiency of tall fescue to a certain extent, and the results of the nitrogen and phosphorus ratio show that nitrogen is the main factor limiting plant growth in a vegetation concrete ecological restoration system, which can supplement nitrogen to accelerate the process of vegetation restoration. The application of BR can improve the biomass and stress resistance of tall fescue, adjust the nutrient distribution strategy and stoichiometric stability, and alleviate the adverse effects of drought on plants. This study provides new ideas and methods for ecological restoration and vegetation reconstruction in arid areas.

Suggested Citation

  • Roujia Kang & Mingyi Li & Shiwei Guo & Dong Xia & Liming Liu & Wenhao Dong & Wennian Xu & Yucai Lv, 2024. "Effect of Brassinolide on Stoichiometric Stability Characteristics of Tall Fescue under Drought Stress in Ecological Restoration," Sustainability, MDPI, vol. 16(14), pages 1-17, July.
    • Handle: RePEc:gam:jsusta:v:16:y:2024:i:14:p:5942-:d:1433900
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    References listed on IDEAS

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    1. Yueyao Li & Fangwei Fu & Jiangrong Li & Wensheng Chen & Huihui Ding & Siying Xiao, 2023. "Stoichiometric Characteristics of Abies georgei var. smithii Plants in Southeast Tibet," Sustainability, MDPI, vol. 15(11), pages 1-18, May.
    2. Yan, Shicheng & Wu, You & Fan, Junliang & Zhang, Fucang & Guo, Jinjin & Zheng, Jing & Wu, Lifeng & Lu, Junsheng, 2022. "Quantifying nutrient stoichiometry and radiation use efficiency of two maize cultivars under various water and fertilizer management practices in northwest China," Agricultural Water Management, Elsevier, vol. 271(C).
    3. He, Rui & He, Min & Xu, Haidong & Zhang, Kun & Zhang, Mingcai & Ren, Dan & Li, Zhaohu & Zhou, Yuyi & Duan, Liusheng, 2023. "A novel plant growth regulator brazide improved maize water productivity in the arid region of Northwest China," Agricultural Water Management, Elsevier, vol. 287(C).
    4. Guanghua Jing & Tianming Hu & Jian Liu & Jimin Cheng & Wei Li, 2020. "Biomass Estimation, Nutrient Accumulation, and Stoichiometric Characteristics of Dominant Tree Species in the Semi-Arid Region on the Loess Plateau of China," Sustainability, MDPI, vol. 12(1), pages 1-16, January.
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