ISSN:
1432-2048
Keywords:
Abscisic acid
;
Desiccation tolerance
;
Desiccation-related proteins
;
Exormotheca
;
Marchantiales
Source:
Springer Online Journal Archives 1860-2000
Topics:
Biology
Notes:
Abstract Abscisic acid (ABA) induces formation of a set of proteins in the xerophilic liverwortExormotheca holstii. Some of them have immunological properties similar to the dehydrins of desiccated corn embryos and the desiccation-related proteins ofCraterostigma plantagineum. The fluctuations of endogenous ABA during cycles of desiccation and rehydration seem to be sufficiently high to indicate a role for ABA as a stress hormone and there by as an endogenous inductor of stress-related protein synthesis. Desiccation tolerance disappears when thalli are cultivated for a longer period under well-watered conditions; such thalli are not able to increase stress-dependent ABA biosynthesis sufficiently, or to form the desiccation-related proteins unless they are treated with external ABA. The rehydrated thalli cannot recover from a rapid water loss, while ABA-treated, non-hardened thalli regain their photosynthetic activity within two hours.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00714466
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