Dessication-induced Changes in the Protein Complement of Soluble Extracts from Leaves of Resurrection Plants and Related Desiccation-sensitive Species
1980; Oxford University Press; Volume: 45; Issue: 2 Linguagem: Inglês
10.1093/oxfordjournals.aob.a085808
ISSN1095-8290
Autores Tópico(s)Plant Water Relations and Carbon Dynamics
ResumoPolyacrylamide gel electrophoresis studies were conducted on the soluble proteins of angiosperm plants whose leaf protoplasm can revive from complete dehydration (Xerophyta viscosa, Talbotia elegans, Sporobolus stapfianus, Myrothamnus flabellifolia, Borya nitida) and of desiccation sensitive plants (Sporobolus pyramidalis, Eragrostis tenuifolia, Selaginella kraussiana). Changes in the soluble protein composition were found in all species after dehydration, and were extensive in most species, both resurrection and non-resurrection. Both groups showed loss of protein bands, but there was no consistent pattern of compositional change within either type of plant. Net hydrolysis of high molecular weight protein could be deduced, and the possibility of disulphide-mediated aggregation arose in some species. Induction of tolerance to desiccation in Borya nitida appeared to be associated with retention or restoration of the control pattern of protein bands in contrast to loss of very low and very high mol. wt protein (loss was extreme in desiccation-killed leaves). There was evidence of a disproportionately great synthesis of very low mol. wt protein during the midphase of rehydration in X. viscosa. These results point to the possibility of an important role of protein synthesis for survival of dehydration.
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