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DRESCH, DAIANE M.; SCALON, SILVANA P.Q.  and  MASETTO, TATHIANA E.. Effect of storage in overcoming seed dormancy ofAnnona coriacea Mart. seeds. An. Acad. Bras. Ciênc. [online]. 2014, vol.86, n.4, pp.2077-2085.  Epub Oct 14, 2014. ISSN 0001-3765.

The aim of this study was to evaluate the effect of pre-treatments on overcoming dormancy of A. coriacea seeds. Seeds were processed and stored in polyethylene bags at temperatures of at -18°C (42% RH), 5°C (34% RH), 15°C (60% RH) and 25°C (34% RH), during 0, 30, 60, 90, 120 and 150 days. After storage, seeds were immersed in 350 mg.L−1 gibberellic acid for 144 hours. Sowing was carried out in plastic bags containing Red Latosol + Bioplant®. Moisture content, emergence percentage, emergence speed index, length and dry mass of seedlings, were evaluated. The experimental design was completely randomized in a factorial with four replications of 50 seeds each. The seed storage at 5°C and subsequent immersion in gibberellic acid was efficient to reach high percentage, emergence speed and plant growth. A. coriacea seeds showed non-deep simple morphophysiological dormancy wherein the physiological component can be overcome after the seeds are storage at 5°C for a maximum period of 53 days and subsequent immersed in exogenous GA (350 mg.L−1 for 144 hours).

Keywords : Annonaceae; gibberellins; Brazilian Savanna; temperatures.

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