珍稀石斛属植物对喀斯特生境适应的电生理指纹谱与生理权衡策略
Electrophysiological Fingerprint and Physiological Trade-off Strategies of Rare Dendrobium Species in Adapting to Karst Habitats
杨平飞 1郑治洪 1杨丽丽 1吴明开1
作者信息
- 1. 贵州省现代中药材研究所（贵州省中药材白芨繁育与种植工程研究中心）
- 折叠
摘要
石斛属植物是重要的珍稀药用植物资源，其野外种群因喀斯特石漠化生境破碎化而面临严峻挑战。理解不同石斛物种对喀斯特干旱、贫瘠生境的适应机制，对其保护与可持续利用至关重要。本研究以7种石斛（束花石斛 Dendrobium chrysanthum、铁皮石斛 D. officinale、曲轴石斛 D. gibsonii、美花石斛 D. loddigesii、金钗石斛 D. nobile、流苏石斛 D. fimbriatum、细叶石斛 D. hancockii）为对象，整合叶片电生理（涵盖水分、营养、能量代谢等六大类50项指标）、叶绿素含量及叶形态数据。研究发现，依据茎形态分为茎粗壮、质地较硬型（束花、曲轴、金钗、流苏、细叶）与茎细弱、肉质型（铁皮、美花）两类，它们在应对模拟喀斯特生境胁迫时演化出截然不同的生理适应策略。茎粗壮型普遍采用"保守?防御"策略：通过构建高阻隔性细胞膜系统（高固有生理电阻、阻抗）限制水分散失，同时依赖高能耗主动运输（高主动转运单位流量、高基于感抗的代谢能）维持胞内离子稳态；其代谢活性（代谢流、相对代谢活力）受到抑制，能量优先用于胁迫防御而非快速生长。茎细弱型则倾向于"机会?生长"策略：具有更高的代谢活性、更高效的水分和养分转运能力（高胞内水分转移速率、高容性物质输导力），以快速获取并利用资源支持生长，但这也可能使其在极端胁迫下更易受损。本研究首次从系统电生理学视角揭示了石斛属植物种间在喀斯特生境适应上的根本性分化，为精准评估其濒危机制、选育抗逆优质种质资源提供了关键理论依据，对保障石斛类贵细中药材的资源安全具有重要实践价值。
Abstract
Dendrobium species are important and rare medicinal plant resources, whose wild populations are severely threatened by habitat fragmentation caused by karst rocky desertification. Elucidating the adaptation mechanisms of different Dendrobium species to the drought and nutrient poor conditions of karst habitats is therefore crucial for their conservation and sustainable utilization. In this study, seven Dendrobium species (D. chrysanthum, D. officinale, D. gibsonii, D. loddigesii, D. nobile, D. fimbriatum, and D. hancockii) were investigated by integrating leaf electrophysiological parameters (covering 50 indicators across six categories, including water, nutrition and energy metabolism), chlorophyll content and leaf morphological data. Based on stem morphology, the species were classified into two types: the thick and firm stem type (D. chrysanthum, D. gibsonii, D. nobile, D. fimbriatum, D. hancockii) and the slender and succulent stem type (D. officinale, D. loddigesii). These two types exhibited distinctly different physiological adaptation strategies when subjected to simulated karst habitat stress. The thick stemmed type generally adopted a "conservative defense" strategy: it restricted water loss by constructing a highly resistant cell membrane system (high intrinsic physiological resistance and impedance), while maintaining intracellular ion homeostasis through energy intensive active transport (high active transport unit flow, high energy metabolism based on inductive reactance); its metabolic activity (metabolic flux, relative metabolic activity) was suppressed, and energy was preferentially allocated to stress defense rather than to rapid growth. In contrast, the slender stemmed type tended to adopt an "opportunistic growth" strategy, exhibiting higher metabolic activity and more efficient water and nutrient transport capacity (high intracellular water transfer rate, high capacitive substance conductivity), enabling rapid resource acquisition and utilization to support growth, though this may render it more vulnerable under extreme stress. This study reveals, for the first time from a systematic electrophysiological perspective, a fundamental differentiation in karst habitat adaptation among *Dendrobium* species. The findings provide a key theoretical basis for accurately assessing the endangerment mechanisms of these species and for breeding stress tolerant, high quality germplasm resources, and have important practical value for ensuring the resource security of precious Dendrobium Chinese medicinal materials.关键词
石斛属/喀斯特石漠化/植物电生理/水分代谢/营养代谢/适应策略/濒危机制Key words
Dendrobium/karst rocky desertification/plant electrophysiology/water metabolism/nutrient metabolism/adaptation strategy/endangerment mechanism引用本文复制引用
杨平飞,郑治洪,杨丽丽,吴明开.珍稀石斛属植物对喀斯特生境适应的电生理指纹谱与生理权衡策略[EB/OL].(2026-04-22)[2026-04-24].http://www.paper.edu.cn/releasepaper/content/202604-164.学科分类
植物学/生物物理学/生理学
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