Germination of Dasylirion lucidum Rose and Beaucarnea gracilis Lemaire from a xerophytic shrubland
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Abstract
Purpose ̶ to study the effect of the fruit removal and two thermal regimes on the germination of D. lucidum, and the effect of such factors, and seed age on the germination of B. gracilis.
Methodology ̶ were established randomized blocks experiments. The statistical analysis was performed with mixed models.
Results ̶ the germination of D. lucidum was affected by the interaction fruit removal*temperature (p≤ .0001), it reached 95.8 % at 20/17 °C, without fruit. In B. gracilis, germination was influenced by fruit removal (p= .0323); without fruit it reached a mean of 89.3%, with fresh seed or one year old seed, at 30 or 25/20 °C, without effect of age nor temperature.
Limitations ̶ in future works must be identified the potential germination chemical inhibitors.
Findings ̶ we consider there is chemical dormancy in both species, its germination would be favored by solubilization of inhibitors from the fruit by rains arrival (or with fruit removal).
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