Abstract
When apical senescence in the genetic line of peas G2 was prevented by short days fruit development was also found to be retarded. The levels of GA20 and GA29 in cotyledons and pods grown under long or short days were measured by gas chromatography - mass spectrometry multiple ion monitoring using extracts derivatised with deuterated trimethylsilyl groups as internal standards. The levels of GA20 but not GA29, were increased by short days. Conventional gas chromatography - mass spectrometry showed that relative to GA29 the levels of GA19, the other GA identified in G2 cotyledons, were also increased in short days. The levels of GA20 in the pods were highest during the main phase of pod growth early in fruit development.
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