Original Paper

Plant Molecular Biology Reporter

, Volume 30, Issue 4, pp 848-859

First online:

Genome-wide Identification and Characterization of a Dehydrin Gene Family in Poplar (Populus trichocarpa)

  • Chang-Cai LiuAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry UniversityLaboratory for Chemical Defense and Microscale Analysis
  • , Chun-Ming LiAffiliated withForestry Research Institution of Heilongjiang Province
  • , Bao-Guang LiuAffiliated withForestry College, Beihua University
  • , Su-Jie GeAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University
  • , Xiu-Mei DongAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University
  • , Wei LiAffiliated withSchool of Forestry, Northeast Forestry University
  • , Hang-Yong ZhuAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry UniversityBureau of Garden and Park
  • , Bai-Chen WangAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University
  • , Chuan-Ping YangAffiliated withState Key Laboratory of Tree Genetics and Breeding, Northeast Forestry University Email author 

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Abstract

Dehydrins (DHNs) define a complex group of stress inducible proteins characterized by the presence of one or more lysine-rich motifs. DHNs are present in multiple copies in the genome of plant species. Although genome-wide analysis of DHNs composition and chromosomal distribution has been conducted in herbaceous species, it remains unexplored in woody plants. Here, we report on the identification of ten genes encoding eleven putative DHN polypeptides in Populus. We document that DHN genes occur as duplicated blocks distributed over seven of the 19 poplar chromosomes likely as a result of segmental and tandem duplication events. Based on conserved motifs, poplar DHNs were assigned to four subgroups with the Kn subgroup being the most frequent. One putative DHN polypeptide (PtrDHN-10) with a SKS arrangement could originate from a recombination between SKn and KnS genes. In silico analysis of microarray data showed that in unstressed poplar, DHN genes are expressed in all vegetative tissues except for mature leaves. This exhaustive survey of DHN genes in poplar provides important information that will assist future studies on their functional role in poplar.

Keywords

Populus LEA Dehydrins Cold stress Woody plants Cellular dehydration