Germination studies on tabebuia impetiginosa mart. seeds
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Universidade Federal de Lavras
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Seed germination and seedling production of native forest tree species are animportant step in ex situ conservation programs and in the reforestation with ecologicalpurposes. Therefore, understanding seed germination and its regulation is mandatory for thecomplete success of the conservation programs and revegetation techniques. Thus,morphological studies, temperature requirements for seed germination and its control bygibberellins (GAs) were studied in Tabebuia impetiginosa ( ipê-roxo ) seeds. The besttemperature for germination under constant light was 30oC. The imbibition of T. impetiginosaseeds followed the common triphasic pattern, with most of the seeds attaining phase II at 24hours and phase III at 72 hours of imbibition. Visible germination, as radicle elongation,started at 30 hours in water-imbibed seeds and at 24 hours in GA-imbibed seeds. Seedsimbibed in Paclobutrazol, an inhibitor of GA biosynthesis, failed to germinate. However,application of exogenous gibberellins overcame inhibition and allowed germination,suggesting that GAs are regulators of Tabebuia impetiginosa seed germination. The resultssuggested that germination in Tabebuia impetiginosa seeds is controlled by elongation of theradicle and gibberellins may play an important role in regulating it. The possible role ofgibberellins is discussed
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