摘要
采用石蜡切片和光学显微技术对江南油杉(Keteleeria fortunei(Murr.)Carr.var.cyclolepis(Flous)Silba)根、茎、叶的解剖结构进行观测,研究其形态结构对环境的适应性。结果显示:江南油杉叶片为异面叶,上表皮厚11.5μm,外侧覆盖厚4.5μm的角质层,下表皮厚8.6μm,外侧覆盖厚2.4μm的角质层,有气孔器分布,栅栏组织由1~2层细胞组成,海绵组织由2~3层细胞组成,主脉为单脉,厚474.1μm。茎的初生结构中表皮细胞1~2层,外皮层细胞4~6层,内皮层细胞6~8层,其内分布有树脂道;次生结构中木栓层细胞2~3层,栓内层细胞1~2层,皮层内有树脂道和分泌腔分布,维管束紧密排列连成环状。根的初生结构中外皮层细胞3层,内皮层细胞1~2层,具凯氏带,初生木质部为四原型;次生结构中木栓层细胞3~4层,栓内层细胞2~3层。江南油杉营养器官的解剖结构表现出较大的可塑性,使之既能较好地适应阳生环境又对阴生环境具备一定的适应性,还可耐受一定的干旱和寒冷。
In this paper,the anatomical structures of the roots,stems,and leaves of Keteleeria fortunei(Murr.)Carr.var.cyclolepis(Flous)Silba were observed by paraffin-sectioning and optical microscopy to analyze the adaptability of its morphological structure to the environment.Results showed that the leaves of K.fortunei var.cyclolepis were bifacial,including an 11.5μm thick upper epidermis(outer layer covered by 4.5μm cuticle)and a n 8.6μm thick lower epidermis(outer layer covered by 2.4μm cuticle).Stomata were observed on the surface of the lower epidermis.There were 1-2 layers of cells in the palisade tissue and 3-4 layers of cells in the spongy tissue.There was a single,474.1μm thick main vein.In the primary structure of the stem,there were 1-2 layers of epidermal cells,4-6 layers of outer cortical cells,6-8 layers of endothelial cells,and resin ducts distributed in the inner cortex.In the secondary structure of the stem,there were 2-3 layers of cork cells and 1-2 layers of phelloderm cells.There were resin ducts and secretory cavities in the cortex,and vascular bundles were closely arranged in a ring.In the primary structure of the roots,there were three layers of cells in the exodermis and 1-2 layers of endothelial cells,with a Casparian strip.There were four types of primary xylem in the roots.In the secondary structure of the roots,there were 3-4 layers of cork cells and 2-3 layers of phelloderm cells.Thus,the anatomical structure of the vegetative organs showed great plasticity,which may account for the adaptive ability of this species to the sunlit as well as shaded environments,and its tolerance to both drought and cold.
作者
刘雄盛
肖玉菲
王勇
黄荣林
姜英
刘菲
蒋燚
Liu Xiong-Sheng;Xiao Yu-Fei;Wang Yong;Huang Rong-Lin;Jiang Ying;Liu Fei;Jiang Yi(Guangxi Key Laboratory of Superior Trees Resource Cultivation,Guangxi Zhuang Autonomous Region Forestry Research Institute,Nanning 530002,China)
出处
《植物科学学报》
CAS
CSCD
北大核心
2020年第1期39-46,共8页
Plant Science Journal
基金
广西重点研发计划(桂科AB16380100)。
关键词
江南油杉
营养器官
解剖结构
生态适应性
Keteleeria fortunei var.cyclolepis
Vegetative organ
Anatomical structure
Ecological adaptability
