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Abstract Detail


A Century Of Wood Anatomy and 75 Years Of IAWA

Groover, Andrew [1].

Genetic regulation of secondary growth in forest trees.

GENETIC studies are beginning to define the genetic mechanisms regulating the vascular cambium and secondary growth, and indicate significant overlap in the mechanisms regulating the shoot apical meristem and the vascular cambium. To further understand once such mechanism, we have cloned and characterized the Populus orthologs of two key regulators of the shoot apical meristem, SHOOTMERISTEMLESS (STM) and BREVIPEDICELLUS (BP, also known as KNAT1). The Populus orthologs of STM and BP are expressed in both the shoot apical meristem and the cambium region, and misexpression of these genes condition phenotypes with defects in secondary growth and wood formation. Microarray analysis of plants overexpressing either the Populus STM or KNAT1 orthologs reveals a complex role for these genes, including regulating genes involved in secondary cell wall synthesis and lignification, and interaction with pathways involving traditional plant growth regulators. Biochemical analysis of cell wall components confirm changes in cell wall synthesis and lignification indicated by microarray analysis. The relevance of these and related studies to the evolutionary processes leading to woody growth will be discussed.


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Institute of Forest Genetics


1 - USDA Forest Service, Institute of Forest Genetics, 1100 West Chiles Rd, Davis, California, 95616, USA

Keywords:
Cambium
Wood formation
development
Populus.

Presentation Type: Symposium or Colloquium Presentation
Session: 36-8
Location: 102/Plumas
Date: Tuesday, August 1st, 2006
Time: 2:30 PM
Abstract ID:856


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