Abstract

RAMIREZ, H. et al. Prohexadione calcium decreases the content of endogenous gibberellins in shoot apex of tomato saladette and bell pepper. Rev. Chapingo Ser.Hortic [online]. 2008, vol.14, n.2, pp.193-198. ISSN 2007-4034.

To evaluate the effects of prohexadione-calcium (P-Ca) on endogenous gibberellins levels in saladette tomato (Lycopersicon esculentum Mill.) and bell pepper (Capsicum annuum L.) shoot apex this study was conducted. Growth retardant was sprayed at three dosages (125, 175 and 200 mg·liter^-1) and a control (H₂O) was also included in both vegetables crops when six true leaves appeared in seedlings. Shoots apex was collected at 0, 1, 3 and 6 days after treatments, and were later lyophilized. Gas chromatography and mass spectrometry assays (GCMS) was used for quantitative and qualititative gibberellins analysis. Results showed that saladette tomato apex sprayed with P-Ca reflected less A₄ and A₇ gibberellins from the first day after treatment. This tendency was similar in bell pepper samples. The GCMS analysis allowed A₂₀ gibberellin identification in tomato, and A₂₀ and A₅₃ gibberellins in bell pepper samples from P-Ca treated plants. The A₁, A₄ and A₇ gibberellins were detected in control samples.

Keywords : tomato; bell pepper; gibberellins; hormones.

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