Gibberellin A3 levels in bark and flower buds of peach (Prunus persica L.) before leaf fall
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Abstract
The endogenous gibberellins of cambial tissue were studied in comparison with those of flower buds in one-year limbs of peach (Prunus persica L.) trees, cv. Novedad de Córdoba. Sampling was done approximately one month before leaf fall. Gibberellin A3 was the only gibberellin characterized by gas chromatography-mass spectrometry (full spectrum) in cambial tissue from both free acid ethyl acetate soluble extract (free gibberellins) and free acid ethyl acetate after enzymatic hydrolysis of the water-soluble extract (glucosyl-conjugated gibberellins). The quantifications, by gas chromatography-selected ion monitoring using deuterogibberellin A3 as an internal standard, were respectively 803 and 52 ng g⁻¹ dry weight of tissue for the two different extracts. No gibberellin could be detected in the flower bud extracts.
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