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GLYCEROL UTILIZATION IN SEEDS OF CORYLUS AVELLANA (L)
Author(s) -
STOBART A. K.,
PINFIELD N. J.
Publication year - 1970
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.1469-8137.1970.tb02473.x
Subject(s) - gibberellin , glycerol , germination , sucrose , chemistry , lipase , biochemistry , botany , sugar , biology , enzyme
S ummary The distribution of radioactivity from [ 14 C]glycerol in the cotyledons and embryonic axes of hazel seeds pre‐treated either with gibberellin or water for various periods has been investigated. The cotyledons of both gibberellin and water prereated seeds utilized considerable quantities of [ 14 C]glycerol. In the cotyledons, gibberellin prereatment induced an increased percentage incorporation of radioactivity into sucrose but percentage incorporation of 14 C in polar lipid and released CO 2 gave higher values after pre‐treatment with water. The increase in gluconeogenesis in cotyledons from gibberellin pre‐treated seeds was accompanied by an increase in lipase activity. In the embryonic axes gibberellin pre‐treatment resulted in increases in percentage incorporation of 14 C into both polar lipid and respired CO 2 . The results indicate that gibberellin stimulates the following processes in the cotyledons during the first 8 days of germination: a diversion of glycerol away from the TCA cycle and into carbohydrates, an increase in lipase activity, presumably resulting in a rise in production of endogenous glycerol and an increased rate of membrane dissolution. In the embryonic axes, over the same period, gibberellin appears to stimulate a more rapid respiration of glycerol and increased production of lipid membranes.