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POTENTIATION OF SULPHUR DIOXIDE INDUCED INHIBITION OF PROTEIN SYNTHESIS BY DESICCATION
Author(s) -
OKOLOKO G. E.,
BEWLEY J. DEREK
Publication year - 1982
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1982.tb03302.x
Subject(s) - desiccation , protein biosynthesis , desiccation tolerance , biology , biochemistry , botany , chemistry , biophysics
SUMMARY In vivo protein synthesis in the gametophyte apices of Tortula ruralis (Hedw.) Gaertn, Meyer and Scherb was studied in relation to desiccation and sulphur dioxide stress. The latter was applied in aqueous form, at three levels (0.1, 0.5 and 1.0 mol m −3 ), while two drying regimes (slow and rapid) were employed. Desiccation by itself caused only a slight inhibition of protein synthesis following 30 min rehydration. SO 2 at 0.1 mol m −3 was stimulatory to protein synthesis when applied alone (20%) or in combination with slow desiccation (14%). Combining 0.1 mol m −3 SO 2 with rapid desiccation not only abolished this stimulation but further reduced protein synthesis to 70% of control. SO 2 at both 0.5 and 1.0 mol m −3 was inhibitory to protein synthesis in the absence of desiccation. Desiccation applied after pretreatment in 0.5 mol m −3 and 1.0 mol m −3 SO 2 caused a potentiation of SO 2 inhibition, rapid desiccation having a stronger effect in this regard than slow desiccation.