外源多效唑对干旱胁迫下闽楠幼苗抗旱性的影响

doi:10.13287/j.1001-9332.202410.007

应用生态学报 ›› 2024, Vol. 35 ›› Issue (10): 2667-2676.doi: 10.13287/j.1001-9332.202410.007

外源多效唑对干旱胁迫下闽楠幼苗抗旱性的影响

宋艳艳^1,2, 徐培月^1,2, 何功秀^1,2*, 胡孔飞³, 及利², 杨丽丽², 孙洪刚⁴, 张勰⁵

¹中南林业科技大学林学院, 长沙 410004;
²南方林业生态应用技术国家工程实验室, 长沙 410004;
³湖南景辉农林生态科技有限公司, 长沙 410004;
⁴中国林业科学研究院亚热带林业研究所, 杭州 310000;
⁵湖南省林业科学院, 长沙 410004

收稿日期:2024-04-07 接受日期:2024-08-14 出版日期:2024-10-18 发布日期:2025-04-18
通讯作者: * E-mail: hegongxiu@163.com
作者简介:宋艳艳, 女, 1999年生, 硕士研究生。主要从事林学、水土保持与荒漠化防治研究。E-mail: 1044062132@qq.com
基金资助:
杉木闽楠混交林培育技术研究与示范项目(2021YFD2201303)和长沙市雨花区科技计划项目(YHKJ-2022-ZN-02)

Effect of exogenous paclobutrazol on the drought resistance of Phoebe bournei seedlings under drought stress

SONG Yanyan^1,2, XU Peiyue^1,2, HE Gongxiu^1,2*, HU Kongfei³, JI Li², YANG Lili², SUN Honggang⁴, ZHANG Xie⁵

¹College of Forestry, Central South University of Forestry and Technology, Changsha 410004, China;
²National Engineering Laboratory of Southern Forestry Ecological Application Technology, Changsha 410004, China;
³Hunan Jinghui Agriculture and Forestry Ecological Technology Co. Ltd., Changsha 410004, China;
⁴Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Hangzhou 310000, China;
⁵Hunan Academy of Forestry, Changsha 410004, China

Received:2024-04-07 Accepted:2024-08-14 Online:2024-10-18 Published:2025-04-18

摘要/Abstract

摘要： 为明确外源多效唑对闽楠幼苗抗旱性的响应机制,以2年生闽楠幼苗为试材,采用自然干旱法,研究不同浓度多效唑(25、50、100 mg·L^-1)喷施对干旱胁迫下闽楠幼苗光合系统和抗氧化系统的影响。结果表明: 干旱胁迫显著减弱闽楠幼苗的光合作用,打破抗氧化系统的动态平衡,不同浓度多效唑喷施均能有效缓解干旱胁迫下闽楠幼苗受到的胁迫损伤,提升光合系统和抗氧化系统的防御能力,其中100 mg·L^-1多效唑处理最为有效。100 mg·L^-1多效唑处理下,与干旱处理相比,闽楠幼苗叶片中叶绿素总量显著增加,最高增幅为51.9%,表观光合电子传递速率、光化学淬灭系数、实际光化学量子产量显著提高,最高增幅分别为67.8%、58.4%、59.7%,净光合速率、气孔导度、蒸腾速率显著增长,最高增幅分别为65.5%、65.4%、68.6%。外源100 mg·L^-1多效唑通过调控闽楠幼苗光合系统和抗氧化系统提升闽楠幼苗抗旱性的能力最强。

关键词: 闽楠, 多效唑, 干旱胁迫, 抗旱性

Abstract: To clarify the response mechanism of exogenous paclobutrazol on drought resistance in Phoebe bournei seedlings, we investigated the effects of spraying different concentrations of paclobutrazol (25, 50, 100 mg·L^-1) on the photosynthetic and antioxidant systems of 2-year-old P. bournei seedlings under drought stress using natural drought method. The results showed that drought stress significantly reduced the photosynthesis and broke the dynamic balance of antioxidant system in P. bournei seedlings. Spraying with different concentrations of paclobutrazol effectively alleviated the negative impacts of drought stress, and enhanced the defense capability of photosynthetic and antioxidant systems, with the 100 mg·L^-1 paclobutrazol treatment being the most effective. Under exogenous 100 mg·L^-1 paclobutrazol treatment, the total chlorophyll in leaves increased significantly, with a maximum increase of 51.9%. The apparent photosynthetic electron transfer rate, photochemical quenching coefficient and actual photochemical quantum yield were significantly increased, with maximum increase of 67.8%, 58.4%, and 59.7%, respectively. The net photosynthetic rate, stomatal conductance and transpiration rate, were enhanced, reaching maximum increase of 65.5%, 65.4%, and 68.6%, respectively. In summary, exogenous 100 mg·L^-1paclobutrazol has the strongest ability to enhance drought resistance of P. bournei seedlings by regulating photosynthetic and antioxidant systems.

Key words: Phoebe bournei, paclobutrazol, drought stress, drought resistance

宋艳艳, 徐培月, 何功秀, 胡孔飞, 及利, 杨丽丽, 孙洪刚, 张勰. 外源多效唑对干旱胁迫下闽楠幼苗抗旱性的影响[J]. 应用生态学报, 2024, 35(10): 2667-2676.

SONG Yanyan, XU Peiyue, HE Gongxiu, HU Kongfei, JI Li, YANG Lili, SUN Honggang, ZHANG Xie. Effect of exogenous paclobutrazol on the drought resistance of Phoebe bournei seedlings under drought stress[J]. Chinese Journal of Applied Ecology, 2024, 35(10): 2667-2676.

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外源多效唑对干旱胁迫下闽楠幼苗抗旱性的影响

Effect of exogenous paclobutrazol on the drought resistance of Phoebe bournei seedlings under drought stress

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