XU Xiao-lin,ZHENG Xing-feng,ZHOU Xiao-yun.Study on Anatomical Structure of Vegetative Organs of Portulacaria afra[J].Northern Horticulture,2013,37(01):62-64.
绿玉树营养器官解剖结构研究
- Title:
- Study on Anatomical Structure of Vegetative Organs of Portulacaria afra
- 文章编号:
- 1001-0009（2013）01-0062-03
- 分类号:
- S 793.9
- 文献标志码:
- A
- 摘要:
- 应用石蜡切片技术，在光学显微镜下观察绿玉树根、茎、叶等营养器官的解剖结构，以探讨其营养器官结构上的抗旱性特征。结果表明：绿玉树根和茎具有次生生长，产生周皮和次生维管组织。根皮层，茎皮层和髓以及叶肉中具有体积较大的储水细胞。根、茎、叶含有被染为红褐色或深灰色物质的异细胞，茎、叶的部分细胞中存在簇晶。根次生木质部中管孔较大，轴向木薄壁细胞较多。茎表面具密集小乳突，薄壁组织细胞中存在较多淀粉粒。叶片肉质较厚，等面叶，气孔器平列型，表面有较厚角质层。绿玉树根的导管较粗和木薄壁组织发达，根、茎和叶中具有较多储水细胞等特征与抗旱性有关。
- Abstract:
- Using the paraffin section technique，under light microscope，the roots，stems，leaves and other vegetative organ anatomical structures of Portulacaria afra were observed，in order to explore the structure of vegetative organs of the characteristics of drought resistance.The results showed that the roots and stems of Portulacaria afra were with secondary growth，producing periderm and secondery vascular tissue.There were many big water cells in the cortex of roots and stems，marrow of stems，and mesophyll of leaves.There were abnormal cells dyed into red-brown or dark-grey in roots，stems and leaves.There were a few cells with cluster crystals in stems and leaves.The aperture of catheter was bigger and there were many axial direction wood parenchyma cells in the secondary xylem of roots.There were many starch grains in the parenchyma cells of stems，and surface of stems was with concentrated small papillae.The leaves with thick cuticle on the surface were fleshy thick and isobitateral.The stomata were paracytic type.Some characteristics were relative to drought resistance such as bigger aperture of catheter and developed wood parenchyma of roots，many water cells in roots，stems and leaves.
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备注/Memo
第一作者简介：徐小林（1976-），女，四川乐山人，硕士，讲师，现主要从事园林植物等研究工作。E-mail:xxljzh@jsnu.edu.cn.