马尾松次生维管组织的变化特征  

Variation Characteristics of Secondary Vascular Bundles in Pinus massoniana

作　　者：杨超 范付华 徐刚 YANG Chao;FAN Fu-hua;XU Gang(Institute for Forest Resources and Environment of Guizhou/College of Forestry,Guizhou University,Guiyang 550025,Guizhou,China)

机构地区：[1]贵州大学贵州省森林资源与环境研究中心/林学院,贵州贵阳550025

出　　处：《林业科学研究》2023年第2期186-194,共9页Forest Research

基　　金：贵州省科技计划项目([2018]5261)。

摘　　要：[目的]旨在揭示马尾松次生维管组织在发育过程中细胞结构、成分和功能的变化规律。[方法 ]通过组织化学分析和细胞离析等手段,研究马尾松维管组织的细胞形态、结构、木质素和纤维素的变化。[结果 ]维管形成层分化形成新生韧皮部和木质部时会逐渐富集纤维素;韧皮部发育过程中筛胞发生形变、细胞壁木质化,韧皮部纤维素含量占比下降。木质部管胞由早材向晚材的发育过程中,纹孔直径降低,纹孔数量下降,次生壁木质化程度增加,胞腔面积下降,纤维素含量占比下降,弦向壁及径向壁增厚。[结论 ]次生维管组织内木质部与韧皮部的细胞结构和成分随发育进程会发生规律性变化,其中,木质部细胞的胞内及胞间输导能力下降,机械强度上升;次生韧皮部丧失输导能力,机械强度上升。[Objective]This study is to reveal the changes of cellular structure,composition and function of secondary vascular tissue in Pinus massoniana during development.[Methods]The change of morphology,structure,lignin and cellulose in the vascular tissue of P.massoniana were studied by histochemical analysis and cell segregation.[Results]The vascular cambium gradually enriched cellulose when it differentiated into new phloem and xylem.During the development of phloem,the sieve cells were deformed and lignified,and the proportion of cellulose in phloem decreased.During the development of xylem tracheids from early wood to late wood,the diameter of striated pores decreased,the number of striated pores decreased,the lignification degree of secondary wall increased,the cell lumen area decreased,the proportion of cellulose content decreased,and the choroidal and radial walls thickened.[Conclusion]The cellular composition and structure of secondary vascular tissues change regularly with development.The intracellular and intercellular transport capacity of xylem cells decrease,while the mechanical strength increases.The secondary phloem loses its ability to transport and its mechanical strength increases.

关 键 词：马尾松 次生维管组织 结构变化 组织化学分析 

分 类 号：S791.248[农业科学—林木遗传育种] Q246[农业科学—林学]