| 崔 杰 1
，洪文君 2，刘 俊 2，陈伟玉 2，何书奋 2，罗金环 2.极小种群野生植物海南假韶子结构解剖特征研究[J].广东农业科学,2019,46(11):31-36 |
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极小种群野生植物海南假韶子结构解剖特征研究 |
| Anatomical Structure Characteristics of A Wild Plant ofExtremely Small Population Paranephelium hainanensis |
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| DOI：10.16768/j.issn.1004-874X.2019.11.005 |
| 中文关键词: 海南假韶子 极小种群 结构解剖 环境适应 |
| 英文关键词: Paranephelium hainanensis extremely small population anatomical structure environmental adaptability |
| 基金项目:海南自然科学基金面上项目（317209）；三亚市财政预算项目（R200972.419） |
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| 中文摘要: |
| 【目的】探讨海南省极小种群海南假韶子（Paranephelium hainanensis）解剖结构特征与水分运输
机制，为该物种的生态适应性研究提供理论指导。【方法】应用石蜡切片方法，研究海南假韶子根、茎、叶、
气生根结构的解剖结构特征。【结果】海南假韶子叶片为异面叶，叶片分布着较厚的角质层，栅栏组织细胞垂
直叶表整齐排列，厚度为66.71μm；海绵组织排列疏松，5~7层细胞。茎部中维管束近两轮环形排列，木质部具
有明显的导管，茎木质部不发达，但韧皮部和髓部较为发达。根部皮层发达，占半径的54.7%，维管组织具有较
高的木质化，但韧皮部不发达且导管数量较少，其根系储水能力较差。气生根由木栓层、皮层、木质部、韧皮
部和髓部组成，木栓层细胞有3~5层，髓部结构较为发达，占半径的34.60%。【结论】海南假韶子具有一定的耐
旱结构特征，幼苗不耐高温强光照，适宜在郁闭度中等的林下生长。建议在进行迁地保护时，注意海南假韶子
的生境需求。 |
| 英文摘要: |
| 【Objective】In order to provide theoretical guidance for the ecological adaptability of Paranephelium
hainanensis, a plant species with extremely small populations (PSESP) in Hainan Province, we explored the anatomical
structure and water transport mechanism of this species.【Method】The anatomical structure of leaf, stem, root and aerial
root of P. hainanensis were observed by paraffin sectioning method.【Result】The leaf of P. hainanensis belonged to
bifacial leaf, on which there were thick cuticles. The palisade tissue cells arranged in the leaf surface vertically, with a
thickness of 66.71 μm. There were 5-7 layer cells in spongy tissue, which arranged loosely. In the primary structure of
stem, the vascular bundle arranged closely in two rounds. There were obvious vessels on the xylem and the xylem was not
developed. However, stem had developed phloem and marrow. In the primary structure of the root, the cortex was developed,
accounting for 54.7% of root’s radius. The vascular bundle was highly lignified, but the phloem was underdeveloped. The
small diameter and less number of vessels of P. hainanensis showed that the water storage capacity was poor in the root. The
aerial roots of P. hainanensis were composed of cork, cortex, xylem, phloem and marrow. There were 3-5 lay cells in the cork
and the marrow structure was developed, accounting for 34.60% of the radius.【Conclusion】P. hainanensis had droughttolerance structure characteristics. The seedlings were not resistant to high temperature and strong light and they were suitable
to grow under the forest with moderate canopy. It is suggested that attention should be paid to the adaptability of P. hainanensis
to the habitat while conducting ex situ conservation. |
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