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OtherENVIRONMENTAL AND STRESS PHYSIOLOGY
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Identification of Dehydrin-Like Proteins Responsive to Chilling in Floral Buds of Blueberry (Vaccinium, section Cyanococcus)

M. M. Muthalif, L. J. Rowland
M. M. Muthalif
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L. J. Rowland
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Published April 1994. DOI: https://doi.org/10.1104/pp.104.4.1439

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Abstract

The level of three major polypeptides of 65, 60, and 14 kD increased in response to chilling unit accumulation in floral buds of a woody perennial, blueberry (Vaccinium, section Cyanococcus). The level of the polypeptides increased most dramatically within 300 h of chilling and decreased to the prechilling level with the initiation of budbreak. Cold-hardiness levels were assessed for dormant buds of Vaccinium corymbosum and Vaccinium ashei after different chilling treatments until the resumption of growth. These levels coincided with the level of the chilling-responsive polypeptides. Like some other previously described cold-induced proteins in annual plants, the level of the chilling-induced polypeptides also increased in leaves in response to cold treatment; the chilling-induced polypeptides were heat stable, resisting aggregation after incubation at 95[deg]C for 15 min. By fractionating bud proteins first by isoelectric point (pl) and then by molecular mass, the pl values of the 65- and 60-kD polypeptides were found to be 7.5 to 8.0 and the pl value of the 14-kD polypeptide was judged to be 8.5. Purification of the 65- and 60-kD polypeptides, followed by digestion with endoproteinase Lys-C and sequencing of selected fragments, revealed similarities in amino acid composition between the 65- and 60-kD polypeptides and dehydrins. Indeed, antiserum to the lysine-rich consensus sequence EKKGIMDKIKEKLPG of dehydrin proteins cross-reacted to all three of the major chilling-responsive polypeptides of blueberry, identifying these as dehydrins or dehydrin-like proteins.

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Identification of Dehydrin-Like Proteins Responsive to Chilling in Floral Buds of Blueberry (Vaccinium, section Cyanococcus)
M. M. Muthalif, L. J. Rowland
Plant Physiology Apr 1994, 104 (4) 1439-1447; DOI: 10.1104/pp.104.4.1439

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Identification of Dehydrin-Like Proteins Responsive to Chilling in Floral Buds of Blueberry (Vaccinium, section Cyanococcus)
M. M. Muthalif, L. J. Rowland
Plant Physiology Apr 1994, 104 (4) 1439-1447; DOI: 10.1104/pp.104.4.1439
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Plant Physiology
Vol. 104, Issue 4
Apr 1994
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