Endogenous gibberellins in foliage of tomato (Lycopersicon esculentum)
1997; Elsevier BV; Volume: 46; Issue: 5 Linguagem: Inglês
10.1016/s0031-9422(97)00383-x
ISSN1873-3700
AutoresJoséM. Grünzweig, Haim D. Rabinowitch, J. Katan, Maria Wodner, Y. Ben-Tal,
Tópico(s)Plant Reproductive Biology
ResumoEndogenous gibberellins (GAs) from the leaves and shoot tips of 13–14 days old tomato transplants (Lycopersicon esculentum Mill.) grown in solarised or non-solarised soil were analysed by GC-mass spectrometry. Full-scan mass spectra and Kovats retention indices, revealed in plants from both soils the presence of GA1, GA3, GA3-isolactone, GA4, GA8,GA19, GA20, GA29, GA34 and GA51. Further analyses by GC-SIM indicated the presence of GA44 and GA53 in the tomato foliage. An isotope-dilution analysis revealed that most of the GA3-isolactone was a methodological artefact. Our results provide the first conclusive identification of most members of the early-13-hydroxylation biosynthetic pathway in vegetative tomato tissues. In addition, the presence of GA4, GA34 and GA51 which were not reported previously in the tomato, indicates that the early-non-3,13-hydroxylation biosynthetic pathway is also active. Three potentially active GAs: GA1, GA3 and GA4, were identified in tomato foliage, all of which may play an important role in regulating growth in this species.
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