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KMID : 0368420020450040225
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Journal of Plant Biology
2002 Volume.45 No. 4 p.225 ~ p.229
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Expression of a Dehydrin-Like Protein in Maize Seedlings Germinated from Seed Exposed to Freezing
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Jack A. Hartwigsen
Susana A. Goggi
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Abstract
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Dehydrins are a family of heat-soluble, hydrophilic proteins that share a considerable degree of sequence homology. Their expression has been reported in numerous plant species in response to a multitude of environmental stresses including low temperature, freezing, and desiccation. It has also been established that exposing plant tissues to freezing temperatures generates desiccation stress. We observed differential accumulation Of a dehydrin-like protein and corresponding mRNA in three-day-old maize (Zea mays L) seedlings germinated under favorable environmental conditions from seed that had been exposed to freezing temperatures during maturation. This represents the first documented situation in which a dehydrin-like protein differentially accumulates under favorable environmental conditions. We believe that the dehydrin-like protein and corresponding mRNA are synthesized de novo in seedlings that are germinated from seed that have been exposed to freezing in response to desiccation-like stress that persists under favorable environmental conditions resulting from freeze-induced damage sustained by the ungerminated embryo.
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