Pollen development and floral morphology of Populus pseudo-simonii  

作　　者：WANG Jun KANG xiang-yang WEI Qiang WANG Shang-de 

机构地区：[1]National Engineering Laboratory of Forest Genetics and Tree Breeding, Beijing Forestry University, Beijing 100083, P. R. China [2]Key Laboratory for Genetics and Breeding of Forest Trees and Ornamental Plants of Ministry of Education, Beijing Forestry University, Beijing 100083, P. R. China [3]Institute of Integrative Agricultural Development, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100089, P. R. China

出　　处：《Forestry Studies in China》2009年第2期99-104,共6页中国林学（英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant No. 30671708);the National Key Technology R&D Programme of the 11th Five-Year Plan of China (Grant No. 2006BAD32B01)

摘　　要：Pollen development and floral morphology of Populus pseudo-simonii were investigated by stain-squashing and anatomical techniques. It took approximately 16 days for the pollen to develop from pollen mother cells to mature pollen in the green-house. Meiosis of pollen mother cells was regularly applied and completed by a process of simultaneous cytokinesis. Pollen development was considerably asynchronous. The meiotic division was initiated at the bulgy middle position of the flower bud and proceeded towards the tip and base of the bud. The number and size of the nucleoli varied during pollen development and at most eight nucleoli formed in each daughter nucleus at the meiotic telophase, suggesting a paleopolyploid origin of the genus Populus. An association between floral morphology and pollen development was found and the ratio of width to length of flower buds or catkins presented an S-shaped curve related to pollen development as a function of time. The investigation on the pollen development and floral morphology ofP. pseudo-simonii is important for further cross breeding programs of the section Tacamahaca.Pollen development and floral morphology of Populus pseudo-simonii were investigated by stain-squashing and anatomical techniques. It took approximately 16 days for the pollen to develop from pollen mother cells to mature pollen in the green-house. Meiosis of pollen mother cells was regularly applied and completed by a process of simultaneous cytokinesis. Pollen development was considerably asynchronous. The meiotic division was initiated at the bulgy middle position of the flower bud and proceeded towards the tip and base of the bud. The number and size of the nucleoli varied during pollen development and at most eight nucleoli formed in each daughter nucleus at the meiotic telophase, suggesting a paleopolyploid origin of the genus Populus. An association between floral morphology and pollen development was found and the ratio of width to length of flower buds or catkins presented an S-shaped curve related to pollen development as a function of time. The investigation on the pollen development and floral morphology ofP. pseudo-simonii is important for further cross breeding programs of the section Tacamahaca.

关 键 词：floral morphology MEIOSIS MICROGAMETOGENESIS NUCLEOLUS POLLEN Populus pseudo-simonii 

分 类 号：S511[农业科学—作物学] Q944.42[生物学—植物学]