Tree Genetics & Genomes

, Volume 9, Issue 4, pp 989–1004 | Cite as

Diversity and cis-element architecture of the promoter regions of cellulose synthase genes in Eucalyptus

  • Nicky M. Creux
  • Minique H. De Castro
  • Martin Ranik
  • Mathabatha F. Maleka
  • Alexander A. Myburg
Original Paper

Abstract

Lignocellulosic biomass from fast-growing plantation trees is composed of carbohydrate-rich materials deposited into plant cell walls in a coordinated manner during wood formation. The diversity and evolution of the transcriptional networks regulating this process have not been studied extensively. We investigated patterns of species-level nucleotide diversity in the promoters of cellulose synthase (CesA) genes from different Eucalyptus tree species and assessed the possible roles of DNA sequence polymorphism in the gain or loss of cis-elements harboured within the promoters. Promoter regions of three primary and three secondary cell wall-associated CesA genes were isolated from 13 Eucalyptus species and were analysed for nucleotide and cis-element diversity. Species-level nucleotide diversity (π) ranged from 0.014 to 0.068, and different CesA promoters exhibited distinct patterns of sequence conservation. A set of 22 putative cis-elements were mapped to the CesA promoters using in silico methods. Forty-two percent of the mapped cis-element occurrences contained singleton polymorphisms which resulted in either gain or loss of a cis-element in a particular Eucalyptus species. The promoters of Eucalyptus CesA genes contained regions that are highly conserved at the species (Eucalyptus) and genus (with Arabidopsis and Populus) level, suggesting the presence of regulatory modules imposing functional constraint on such regions. Nucleotide polymorphisms in the CesA promoters more frequently created new cis-element occurrences than disrupted existing cis-element occurrences, a process which may be important for the maintenance and evolution of cellulose gene regulation in plants.

Keywords

cis-element conservation Promoter evolution Secondary cell wall Wood formation CesA Woody biomass 

Supplementary material

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Nicky M. Creux
    • 1
  • Minique H. De Castro
    • 1
  • Martin Ranik
    • 1
  • Mathabatha F. Maleka
    • 1
  • Alexander A. Myburg
    • 1
  1. 1.Department of Genetics, Forestry and Agricultural Biotechnology Institute (FABI)University of PretoriaPretoriaSouth Africa

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