植物学报 ›› 2012, Vol. 47 ›› Issue (2): 133-140.DOI: 10.3724/SP.J.1259.2012.00133

• 研究报告 • 上一篇    下一篇

灰叶胡杨根蘖繁殖的形态解剖学特征

李志军1,2,3*, 焦培培1, 周正立1,2, 李倩3, 李健强3*   

  1. 1新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室, 阿拉尔 843300
    2塔里木大学植物科学学院, 阿拉尔 843300;
    3中国农业大学农学与生物技术学院, 北京 100193
  • 收稿日期:2011-03-08 修回日期:2011-07-29 出版日期:2012-03-01 发布日期:2012-03-16
  • 通讯作者: 李志军,李健强
  • 基金资助:

    国家自然科学基金青年基金项目;国家重点基础研究发展计划资助项目;新疆生产建设兵团塔里木盆地生物资源保护利用重点实验室开放课题

Morphological and Anatomical Features of Root Sucker Propagation of Populus pruinosa

Zhijun Li1,2,3*, Peipei Jiao1, Zhengli Zhou1,2, Qian Li3, Jianqiang Li3*   

  1. 1Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin, Xinjiang Production & Construction Corps, Alar 843300, China;

    2College of Plant Science, Tarim University, Alar 843300, China;

    3College of Agriculture and Bio-technology, China Agricultural University, Beijing 100193, China
  • Received:2011-03-08 Revised:2011-07-29 Online:2012-03-01 Published:2012-03-16
  • Contact: Zhijun Li,Jianqiang Li
  • Supported by:

    ;National Program on Key Basic Research Project;Foundation for Xinjiang Production &Construction Corps Key Laboratory of Protection and Utilization of Biological Resources in Tarim Basin

摘要: 利用常规石蜡切片法对灰叶胡杨(Populus pruinosa)根蘖繁殖特性进行形态解剖学研究。结果表明: 灰叶胡杨横走侧根由周皮、次生维管组织和四原型的初生木质部构成, 具有次生维管组织中维管射线、次生韧皮薄壁组织发达的结构特征。灰叶胡杨的根蘖繁殖源于横走侧根上不定芽的发生及生长发育。不定芽起源于横走侧根的木栓形成层, 木栓形成层经细胞分裂活动形成不定芽原基, 不定芽原基细胞分裂和生长分化形成在横走侧根表面可观察到的不定芽, 进而生长发育为根蘖苗。不定芽的发生具有同步或非同步的时间特征和单点或多点聚集的空间分布特点, 在生长发育过程中其基部可以产生新的不定芽。不定芽发生、分布和生长特点是根蘖苗大小不一、密集丛生的内在原因, 表明灰叶胡杨具有较强的根蘖繁殖能力。

Abstract: We studied the morpho-anatomic characteristics of the clonal growth of root suckers of Populus pruinosa by the conventional paraffin method. Transverse lateral roots were formed by periderm, secondary vascular tissue, and the tetrarch’s primary xylem, with developed vascular rays and secondary elongated parenchyma in secondary vascular tissues. The clonal growth of root suckers of P. pruinosa is based on the development and growth of adventitious buds on transverse lateral roots. Adventitious buds originated from cork cambium of transverse lateral roots and expressed the time characteristics of synchronous and asynchronous generation and the spatial characteristics of single-point and multi-point gathered generation. The cork cambium cells formed primordia of adventitious buds by cell division. The cell division, proliferation, and differentiation of adventitious primordia formed visible primordia on the surface of transverse lateral roots and directly developed as root suckers. The features of adventitious bud development, distribution, and growth were the key reason for root suckers to keep growing to different sizes and form a densely fasciculate shape. P. pruinosa has good ability for clonal growth of root suckers.