Comparative microsporogenesis and flower development in Eucalyptus urophylla×E.grandis  

作　　者：Jun Yang Jun Lan Pengqiang Yao Zhen Huang Xiangyang Kang 

机构地区：[1]National Engineering Laboratory for Tree Breeding,Beijing Forestry University,Beijing 100083,People's Republic of China [2]Key Laboratory for Genetics and Breeding of Forest Treesand Ornamental Plants,Ministry of Education,Beijing Forestry University,Beijing 100083,People's Republic of China [3]Guangxi Dongmen Forest Farm,Guangxi Zhuang Autonomous Region 532108,People's Republic of China

出　　处：《Journal of Forestry Research》2016年第2期257-263,共7页林业研究（英文版）

基　　金：financially supported by the Special Fund for Forest Scientific Research in the Public Welfare(201404113);the 111 Project(B13007);the Program for Changjiang Scholars and Innovative Research Team in University(IRT13047)

摘　　要：Microsporogenesis and flower development in Eucalyptus urophylla × E. grandis were examined using chromosome tableting to provide a method to predict the meiotic stages in this species. Although microsporogenesis was normal, cytokinesis during meiosis of pollen mother cells occurred simultaneously, with strong asynchronism observed in the two different lengths of stamens in a flower bud. In a single flower, the developmental period of microsporogenesis in anthers on the longer stamens was always ahead of those on the shorter stamens. Flower development was also asynchronous at different locations on a branch. Flower buds on the upper side of the branch were larger in diameter than those on the lower side. In addition, a correlation was observed between microsporogenesis development and flower bud diameter growth. The pachy- tene stage was first observed when the diameter of the flower buds increased to 3.0 mm, and the majority of the meiotic stages were observed when bud diameters ranged from 3.5 to 5.0 mm. This study showed that the developmental stages of microsporogenesis in Eucalyptus urophylla × E. grandis could be distinguished readily, which may be applicable to future breeding studies.Microsporogenesis and flower development in Eucalyptus urophylla × E. grandis were examined using chromosome tableting to provide a method to predict the meiotic stages in this species. Although microsporogenesis was normal, cytokinesis during meiosis of pollen mother cells occurred simultaneously, with strong asynchronism observed in the two different lengths of stamens in a flower bud. In a single flower, the developmental period of microsporogenesis in anthers on the longer stamens was always ahead of those on the shorter stamens. Flower development was also asynchronous at different locations on a branch. Flower buds on the upper side of the branch were larger in diameter than those on the lower side. In addition, a correlation was observed between microsporogenesis development and flower bud diameter growth. The pachy- tene stage was first observed when the diameter of the flower buds increased to 3.0 mm, and the majority of the meiotic stages were observed when bud diameters ranged from 3.5 to 5.0 mm. This study showed that the developmental stages of microsporogenesis in Eucalyptus urophylla × E. grandis could be distinguished readily, which may be applicable to future breeding studies.

关 键 词：Eucalyptus urophylla × E. grandis MICROSPOROGENESIS Flower development 

分 类 号：S792.39[农业科学—林木遗传育种] Q944.45[农业科学—林学]