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植物生态学报 >

2022 , Vol. 46 >Issue 5: 593 - 601

DOI: https://doi.org/10.17521/cjpe.2021.0328

研究论文

热带亚热带26种蕨类植物的吸收根解剖特征

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  • 广西大学亚热带农业生物资源保护与利用国家重点实验室, 广西大学林学院广西森林生态与保育重点实验室, 南宁 530004
* (zhushidan@gxu.edu.cn) ORCID: 朱师丹: 0000-0002-9228-368X

收稿日期: 2021-09-10

  录用日期: 2021-12-22

  网络出版日期: 2022-02-16

基金资助

广西八桂青年学者项目

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Absorptive root anatomical traits of 26 tropical and subtropical fern species

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  • State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangxi Key Laboratory of Forest Ecology and Conservation, College of Forestry, Guangxi University, Nanning 530004, China

Received date: 2021-09-10

  Accepted date: 2021-12-22

  Online published: 2022-02-16

Supported by

Bagui Young Scholarship of Guangxi Zhuang Autonomous Region

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摘要

植物吸收根的生理功能是从土壤中吸收水分和营养物质, 研究其解剖结构有助于揭示植物的环境适应策略。热带亚热带地区蕨类植物丰富, 生态和经济价值较高, 但目前对这一重要植物类群的吸收根解剖特征的研究仍然缺乏。该研究测定了分布在热带亚热带地区4种典型森林的共26种蕨类植物吸收根的解剖特征, 分析它们的种间差异, 结合系统发育与全球自然分布区的气候因子解释根系性状的变异。同时, 通过收集亚热带木本被子植物和温带蕨类植物相关的已发表数据, 比较不同类群的根系性状相关关系的差异。结果表明: (1)这些蕨类植物吸收根特征的种间差异显著, 8个根系性状的种间变异系数范围为20.61%-41.75%。(2)除皮层厚度外根系性状无显著的系统发育信号, 说明性状变异受系统发育的影响较小; 气候因子显著影响根系特征, 根直径和皮层厚度随着最干月(季)降水量减少而增大。(3)随着吸收根直径的减小, 亚热带木本被子植物趋于具有更低的皮层厚度/中柱直径比值, 而蕨类植物则相反; 与温带蕨类相比, 该研究中蕨类植物具有更大的根直径、皮层厚度和管胞直径。该研究有助于提高对热带亚热带蕨类植物根系生理生态适应性的认识。

关键词： 吸收根; 气候; 系统发育; 根直径; 皮层厚度; 中柱直径

本文引用格式

项伟, 黄冬柳, 朱师丹 . 热带亚热带26种蕨类植物的吸收根解剖特征[J]. 植物生态学报, 2022 , 46(5) : 593 -601 . DOI: 10.17521/cjpe.2021.0328

Abstract

Aims The plant absorptive roots function to absorb water and nutrients. Investigations of anatomical traits of the roots are to understanding environmental adaptations of plant species. Ferns in tropical and subtropical regions are abundant and of important ecological and economic values. However, the anatomical traits of the absorptive roots of ferns are not fully comprehended.

Methods We investigated anatomical traits of absorptive roots for 26 fern species from four typical tropical/ subtropical forests by analyzing inter-specific differences in the traits across the species to explain the influence of phylogeny and climate. In addition, we compiled relevant root traits of subtropical angiosperm tree species and temperate fern species from literature to explore the trait differences among the groups.

Important findings (1) We found significant differences in eight root anatomical traits among the 26 fern species, with coefficient of variation ranging from 20.61% to 41.75%. (2) Root traits showed no significant phylogeny signal except in cortex thickness (CT), indicating little affection from phylogeny. However, climate might exert significant impacts on root traits, i.e., root diameter (RD) and CT significantly increased with decreasing precipitation of the driest month (quarter). (3) As RD decreases, the subtropical angiosperm woody plants showed a significant decrease in the ratio of CT to stele diameter (SD), but fern had an opposite pattern. Compared to temperate ferns, the tropical and subtropical ferns had higher RD, CT, and tracheid diameter (TD).

Key words： absorptive root; climate; phylogeny; root diameter; cortex thickness; stele diameter

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