福建林学院学报2013，Vol.33Issue(3)：262-266,5.
巨尾桉韧皮部周皮形成过程的研究
Study on the periderm forming process in Eucalyptus grandis × E.urophylla phloem
摘要
Abstract
Periderm has important role in protection and high values in commerce.The microstructure of pefiderm forming process in 4 years old Eucalyptus grandis × E.urophylla phloem was studied by paraffin method,the results showed as follows.The periderm formed from late February to early May every year,it lay about 900 μm under outermostlayer,and became deeper with age.Based on the cell morphological structure features and sequence,the periderm forming process was divided into six stages.(1) Before cell dedifferentiating stage,the parenchymal cells where periderm would emerge were static.(2) At cell dedifferentiating stage,the parenchymal cells were dedifferentiating to regain fission ability.(3) Cork cambium forming stage,the parenchymal cells were dividing to forming cork cambium.(4)Cork forming stage,the cork cambium dividing cork cells outward and phelloderm inward.(5) Radial expanded layer forming stage,the cork cambium was expanding in radial direction and becoming radial expanded layer.(6) Phellem cells separating stage,the phellem cells began to abscission from periderm lead to the rhytidome separate from periderm.The radial cell wall of cork cambium broke and restructured at radial expanding layer forming stage,and this phenomenon provided visual evidence for chemical bond fracture theory when cell spreading.关键词
巨尾桉/周皮/形成过程Key words
Eucalyptus grandis × E.urophylla/ periderm/ forming process分类
农业科技引用本文复制引用
刘喜明,陈瑞英,陈居静,于再君..巨尾桉韧皮部周皮形成过程的研究[J].福建林学院学报,2013,33(3):262-266,5.基金项目
龙岩学院青年教师攀登项目 （）
福建省教育厅科学基金资助项目(JB10169). （JB10169）
