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Synthesis of freezing tolerance proteins in leaves, crown, and roots during cold acclimation of wheat


, : Synthesis of freezing tolerance proteins in leaves, crown, and roots during cold acclimation of wheat. Plant physiology 89(2): 577-585

Protein synthesis was studied in leaves, crown, and roots during cold hardening of freezing tolerant winter wheat (Triticum aestivum L. cv Fredrick and cv Norstar) and freezing sensitive spring wheat (T. aestivum L. cv Glenlea). The steady state and newly synthesized proteins, labeled with [35S]methionine, were resolved by one- and two-dimensional polyacrylamide gels. The results showed that cold hardening induced important changes in the soluble protein patterns depending upon the tissue and cultivar freezing tolerance. At least eight new proteins were induced in hardened tissues. A 200 kilodalton (KD) (isoelectric point +or- 6.85) protein was induced concomitantly in the leaves, crown, and roots. Two proteins were specifically induced in the leaves (both 36 kD, pl 5.55 and 5.70); three in the crown with Mr 150 (pl 5.30), 45 (pl 5.75), and 44 kD (pl less than 6.80); and two others in the roots with Mr 64 (pl 6.20) and 52 kD (pl 5.55). In addition, 19 other proteins were synthesized at a modified rate (increased or decreased) in the leaves, 18 in the crown and 23 in the roots. Among the proteins induced or increased in hardened tissues, some were expressed at a higher level in the freezing tolerant cultivars than in the sensitive one, indicating a correlation between the synthesis and accumulation of these proteins and the degree of freezing tolerance. These proteins, suggested to be freezing tolerance proteins, may have an important role in the cellular adaptati on to freezing.

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Accession: 001962571

DOI: 10.1104/pp.89.2.577

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