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Stenocereus stellatus is a columnar cactus species of cultural and ecological importance in the TehuacanValley; theirfruits are collected from wild populations but plants of this species are also silviculturally managed and cultivated in agroforestrysystems. Previous studies documented morpho-physiological and genetic divergences between wild and managed populationscaused by artifi cial selection and limitations to gene fl ow; nevertheless, the documented divergences could also be infl uenced bydifferences in germination and survivorship patterns of wild and cultivated seedlings in forests and managed environments. Wehypothesized that artifi cial selection in favor of larger fruits may in turn favor larger seeds in cultivated plants that also could havehigher germination rates in high humidity conditions, but more susceptible to water stress than seeds from wild plants. We evaluatedfruit and seed weight and germination rates in a water stress gradient (0.0, -0.2, -0.4, -0.6, -0.8, and -1.0 Megapascals) in wildand cultivated populations. Cultivated fruits and seeds were signifi cantly heavier (54.616 ± 1.547 g, 0.190 ± 0.017 g, respectively)than wild fruits and seeds (37.023 ± 1.122 g, 0.153 ± 0.005 g, respectively). Deviance analysis showed signifi cant differences instarting germination (X2 = 1639.0, df = 4; X2 = 236.31, df = 1, respectively) and velocity (X2 = 20.91, df = 4) associated to managementand water potential (cultivated seeds were more susceptible to water stress than wild ones). Artifi cial selection favoring largerfruits has apparently infl uenced indirectly seed size and differences; in wild and managed environments could have infl uenceddifferences of seed susceptibility to water stress.

Consecuencias de la domesticación de Stenocereus stellatus en el tamaño de las semillas y en la germinación en un gradiente de estrés hídrico