Reproductive Characteristics of Pitayo (Stenocereus queretaroensis) and their Relationships with Soluble Sugars and Irrigation

in Journal of the American Society for Horticultural Science
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  • 1 Division de Ciencias Biológicas, Centro de Ciencias Biológicas y Agropecuarias, Universidad de Guadalajara, Nextipac, Zapopan, Jalisco, México
  • | 2 Department of Biology and UCLA-DOE Laboratory, University of California, Los Angeles, CA 90024-1606

Flower and fruit production by the columnar cactus, Stenocereus queretaroensis (Weber) Buxbaum, occurred during the dry season in the late winter and spring, and the relatively small annual stem extension occurred primarily during the fall. Thus, reproductive growth does not directly compete with vegetative growth for resources such as reducing sugars, which increased during the wet summer season, a period when total sugars were decreasing. Stem extension, reproductive demography, fruit quality, seed size, and seed quality were not influenced by irrigation. Final fruit size and seed germination, however, were enhanced by applying water. The times from flower bud differentiation to flower opening and from anthesis to fruit ripening were relatively short and unaffected by irrigation.

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