Antifreeze proteins in overwintering plants: a tale of two activities

✍ Scribed by Marilyn Griffith; Mahmoud W.F. Yaish

• Book ID: 116925867
• Publisher: Elsevier Science
• Year: 2004
• Tongue: English
• Weight: 296 KB
• Volume: 9
• Category: Article
• ISSN: 1360-1385
• DOI: 10.1016/j.tplants.2004.06.007

✦ Synopsis

Antifreeze proteins are found in a wide range of overwintering plants where they inhibit the growth and recrystallization of ice that forms in intercellular spaces. Unlike antifreeze proteins found in fish and insects, plant antifreeze proteins have multiple, hydrophilic icebinding domains. Surprisingly, antifreeze proteins from plants are homologous to pathogenesis-related proteins and also provide protection against psychrophilic pathogens. In winter rye (Secale cereale), antifreeze proteins accumulate in response to cold, short daylength, dehydration and ethylene, but not pathogens. Transferring single genes encoding antifreeze proteins to freezing-sensitive plants lowered their freezing temperatures by w18C. Genes encoding dual-function plant antifreeze proteins are excellent models for use in evolutionary studies to determine how genes acquire new expression patterns and how proteins acquire new activities.