Tree Genetics & Genomes

, Volume 1, Issue 4, pp 166–173 | Cite as

Genes induced by WDS are differentially expressed in two populations of aleppo pine (Pinus halepensis)

  • Pratheesh Sathyan
  • Ronald J. Newton
  • Carol A. Loopstra
Original Paper

Abstract

Gene expression in response to water-deficit stress (WDS) is a critical factor determining the survival and growth of pine seedlings. To understand how gene expression varies with different water stress levels, we differentially screened a cDNA library from roots of aleppo pine (Pinus halepensis) seedlings subjected to WDS. We found 156 clones of genes up-regulated and 56 down-regulated in response to WDS. Of the 14 clones selected for further characterization, 8 resemble WDS-responsive genes previously identified in angiosperms. The genes showing similarities to known proteins included an aldehyde dehydrogenase, a late embryogenesis abundant (LEA) protein, a chitinase, a cyclophilin, an MYB factor, an inorganic pyrophosphatase, a sucrose synthase, and a 4-coumarate ligase. Six of the clones did not have any similarity to previously identified proteins of known function. Quantitative polymerase chain reaction (qPCR) was used to compare the differential expression of these genes during control (no stress), moderate, and severe WDS treatments of seedling progeny from two different geographic origins within Israel, Yirka, and Beit Jann. The difference in expression between the treatments for various genes ranged from 1.9 to 8.0 cycle threshold. Most of the genes were expressed at similar levels in trees from the two populations or at higher levels in trees from Beit Jann, Israel. Northern blot analyses done for four highly expressed genes verify the results of the qPCR.

Keywords

Aleppo pine Drought Gene expression LEA qPCR Water-deficit stress 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Pratheesh Sathyan
    • 1
  • Ronald J. Newton
    • 2
  • Carol A. Loopstra
    • 1
  1. 1.Department of Forest Science, Institute for Plant Genomics and Biotechnology, and Molecular and Environmental Plant SciencesTexas A&M UniversityCollege StationUSA
  2. 2.Department of BiologyEast Carolina State UniversityGreenvilleUSA

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