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Characterization of three heat-shock-protein genes and their developmental regulation during somatic embryogenesis in white spruce [Picea glauca (Moench) Voss]

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Abstract

Three cDNAs (PgEMB22, 27 and 29) predicted to encode low-molecular-weight (LMW) heat-shock proteins (HSPs) were cloned and characterized from white spruce [Picea glauca (Moench) Voss] somatic embryo tissues by differentially screening a cotyledonary embryo cDNA library. Clone PgEMB22 is predicted to encode a putative mitochondria-localized LMW HSP, and PgEMB27 and 29 are predicted to encode different cytoplasmic class II LMW HSPs, although they share 84.7% identity within DNA coding regions and 83.0% identity for predicted proteins. They are developmentally regulated during somatic embryo development and subsequent embryo germination, in addition they show strong response to heat-shock stress. Transcripts of the two kinds of hsp genes could be detected in embryogenic tissues before induction of embryo maturation, but subsequently increased, being most abundant at late embryo stages. Gene expression levels were very low or not detectable in germinated plantlets or needle tissues from older plants. Abscisic acid and polyethylene glycol, stimulators for spruce embryo maturation, could also induce the hsp genes.

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Abbreviations

aa:

amino acid

ABA:

abscisic acid

HSP:

heat-shock protein

Leu:

leucine

LMW:

low molecular weight

Met:

methionine

ORF:

open reading frame

PEG:

polyethylene glycol

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Authors and Affiliations

  1. Plant Biotechnology Institute, National Research Council of Canada, 110 Gymnasium Place, S7N OW9, Saskatoon, Saskatchewan, Canada

    Jin-Zhuo Dong & David I. Dunstan

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  1. Jin-Zhuo Dong
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  2. David I. Dunstan
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Correspondence to David I. Dunstan.

Additional information

We thank Dr. Suzanne Abrams for natural and unnatural ABA enantiomers, and Mr. Barry Panchuk and Mr. Don Schwab for DNA sequencing and primer synthesis. Nucleotide sequences of the three cDNAs corresponding to hsp23.5, hspl7.0 and hspl7.l will appear in GenBank Nucleotide Sequence Database under accession numbers L47741, L47717, L47740, respectively. National Research Council of Canada publication number 38931.

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Dong, JZ., Dunstan, D.I. Characterization of three heat-shock-protein genes and their developmental regulation during somatic embryogenesis in white spruce [Picea glauca (Moench) Voss]. Planta 200, 85–91 (1996). https://doi.org/10.1007/BF00196653

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  • DOI: https://doi.org/10.1007/BF00196653

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