|
|
|
【XML】
【Btbtex】
【RIS】
【RefWorks】
【EndNote】
【TXT】
|
| |
|
|
| 本文已被：浏览次 下载次 |
|
|
|
|
李茜1,2,3, 何国华3,4, 吴莹莹1,2,3, 丰硕1,2,3, 高丽梅3, 邹蓉3, 唐健民1,2,3, 韦霄1,2,3, 魏识广1,2*
|
|
(1.广西师范大学 珍稀濒危动植物生态与环境保护教育部重点实验室,广西 桂林 541006； 2.广西师范大学 广西漓江流域景观资源保育与可持续利用重点实验室,广西 桂林541006； 3.广西壮族自治区中国科学院广西植物研究所,广西 桂林 541006； 4. 桂林理工大学 旅游与风景园林学院,广西 桂林 541006
|
|
| 摘要: |
| 该研究以花榈木（Ormosia henryi）与红豆树（Ormosia hosiei）成年植株和幼苗为对象，通过对比它们的光响应曲线、二氧化碳响应曲线、叶片显微结构和叶绿素含量，旨在揭示两种近缘树种在不同发育阶段的光合生理特征差异及其适应机制。结果表明：（1）两种红豆属植物的最大光合速率（Pmax、Amax）均显著高于幼苗，叶绿素含量、气孔数量和栅栏组织厚度是主要影响因素。（2）花榈木成年植株光饱和点（LSP）和二氧化碳饱和点（CDSP）较高，环境适应性强，红豆树成年植株光补偿点（LCP）较低，更适应弱光环境。（3）幼苗阶段两物种光合速率无显著差异，花榈木通过优化叶片结构提升光合潜力，红豆树则依靠较高的CO?利用效率及叶绿素含量弥补结构上的劣势。综上，花榈木与红豆树光合速率均随着树龄的增加而提升，栅栏组织厚度、气孔数量和叶绿素含量可能是影响红豆属植物光合特性的重要因素，较好的光适应能力可能是红豆树与花榈木广泛分布的适应机制。该研究为花榈木与红豆树的适地性引种、保护利用及光合生态适应机制的研究提供了科学依据。 |
| 关键词: |
| DOI：10.11931/guihaia.gxzw202508031 |
| 分类号: |
| 基金项目: |
|
|
|
LI Xi1,2,3, HE Guohua3,4, WU Yingying1,2,3, FENG Shuo1,2,3, GAO Limei3, ZOU Rong3, TANG Jianmin1,2,3, WEI Xiao1,2,3, WEI Shiguang1,2*
|
|
1. Key Laboratory of Ecology of Rare and Endangered Species and Environmental Protection （Guangxi Normal University),Ministry of Education, Guangxi Normal University, Guilin 541006, Guangxi, China; 2. Guangxi Key Laboratory of Landscape Resources Conservation and Sustainable Utilization in Lijiang River Basin, Guangxi Normal University, Guilin 541006, Guangxi, China; 3. Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region, Chinese Academy of Sciences, Guilin 541006, Guangxi, China; 4. College of Tourism and Landscape Architecture, Guilin University of Technology, Guilin 541006, Guangxi, China
|
| Abstract: |
| This study aimed to compare the photosynthetic physiological characteristics and adaptive mechanisms of adult trees and seedlings of Ormosia henryi and Ormosia hosiei, two closely related species. The investigation focused on differences at different developmental stages by comparing their light response curves, CO? response curves, leaf microstructures, and chlorophyll contents. The results were as follows: (1) The maximum photosynthetic rates (Pmax, Amax) of both Ormosia species were significantly higher in adult trees than in seedlings. The key factors influencing these differences were chlorophyll content, stomatal density, and the thickness of the palisade tissue. Adult trees exhibited superior photosynthetic capacity, likely due to more developed leaf structures. (2) Adult O. henryi exhibited a higher light saturation point (LSP) and CO? saturation point (CDSP), indicating greater adaptability to environmental conditions, particularly in high light and CO? environments. In contrast, adult O. hosiei displayed a lower light compensation point (LCP), suggesting better adaptation to shaded environments with lower light availability. (3) At the seedling stage, there were no significant differences in photosynthetic rates between the two species. However, O. henryi enhanced its photosynthetic capacity by optimizing its leaf structure, such as thicker palisade tissues, while O. hosiei compensated for its structural disadvantages by improving its CO? utilization efficiency and increasing chlorophyll content. In summary, both O. henryi and O. hosiei exhibited increased photosynthetic rates with tree age, with distinct differences between adult trees and seedlings. Key factors such as palisade tissue thickness, stomatal density, and chlorophyll content were found to play significant roles in shaping the photosynthetic characteristics of these species. Furthermore, the superior light adaptation capacity of O. henryi and O. hosiei may represent an adaptive mechanism that underlies their widespread distribution in different environmental niches. This study provides valuable insights for site-specific introduction, conservation strategies, and future research on the photosynthetic ecological adaptation mechanisms of these two Ormosia species. |
| Key words: |
|
|
|
|
|
