The effect of water stress on the degradation and biosynthesis of membrane lipids during the senescence of carnation (Dianthus caryophyllus L. cv. Ember) flowers harvested normally or at the young bud stage

Paulin, A.; Themistocle, C.

Comptes Rendus de l' Academie des Sciences Series 3, Sciences de la Vie 306(9): 307-312

1988


Accession: 001973520

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Abstract
Flowers harvested at the normal stage, just before the petals reach a position at right angles to the stem, withered more rapidly in normal conditions following a period of water stress for 43 h at 23 degrees C and 40% RH. Water stress for 60 h was needed to have the same effect on flowers cut at the young bud stage (bud pointed, petals 5 mm long). Water stress promoted degradation of the fatty acids of polar lipids and increased malondialdehyde levels indicating membrane lipid peroxidation. Lipid biosynthesis, as measured by 14C-sodium acetate incorporation, was greater in flowers harvested at the young bud stage and decreased markedly after water stress for 60 h.