Abstract
GA1 and precursors of the early 13-β-hydroxylation pathway of gibberellins biosynthesis GA17 and GA19 were identified in berries of seedless grape cv. Superior seedless by full-scan gas chromatography mass-spectrometry (GC-MS) and Kovats retention indices (KRI). GA1, GA17, GA19, GA3, and its decomposition product gibberellenic acid were also detected in the berries and seeds of Ribier, a seeded cultivar. Biologically active gibberellins were determined throughout fruit development by the α-amylase bioassay. Levels of active gibberellins expressed as equivalent of GA3/g of fresh weight increased at the onset of the first berry growth phase, and at the initiation of the second growth-phase, in berries of both varieties, whereas in seeds maximum levels were attained during the lag phase. GA3 equivalents were 77-fold higher in seeds compared to berries.
- Received August 1999.
- Revision received July 2000.
- Copyright 2000 by the American Society for Enology and Viticulture
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