Monthly stem elongation for Stenocereus queretaroensis: Relationships to environmental conditions, net CO2 uptake and seasonal variations in sugar content

Seasonal variation of net CO2uptake for cactus pear (Opuntia ficus-indica) and pitayo (Stenocereus queretaroensis) in a semi-arid environment

“…Light limits photosynthesis for both O. ficus-indica and S. queretaroensis, as net CO uptake increases roughly linearly with total daily PPF up to 20 mmol m\ d\ (Nobel & Hartsock, 1984;Nobel & Pimienta-Barrios, 1995). For instance, recent gas exchange observations in the field during the summer reveal that exposed stems of S. queretaroensis (PPF of 16 mol m\ d\) have longer periods of net CO uptake, higher maximal rates, and greater daily net CO uptake than shaded stems (PPF of 3 mol m\ d\; Pimienta- .…”

“…In particular, the mean day/night air temperatures in December 1997 (26/163C) and February 1998 (29/153C) were close to those optimal for net CO uptake by O. ficus-indica under controlled environmental conditions (25/153C; Nobel & Hartsock, 1984;Israel & Nobel, 1995). Maximal daily net CO uptake for S. queretaroensis in the laboratory occurs under day/night temperatures averaging 32/163C (Nobel & Pimienta-Barrios, 1995).…”

Management, phenotypic patterns and domestication of Polaskia chichipe (Cactaceae) in the Tehuacán Valley, Central Mexico

“…ıa et al, 1984;Felker and Russel, 1987;Felker et al, 2002;Pimienta-Barrios, 1994), Stenocereus stellatus (Casas et al, 1999b), S. queretaroensis (Pimienta- Barrios and Nobel, 1994;Nobel and Pimienta-Barrios, 1995), S. pruinosus (Luna and Aguirre, 2001), Escontria chiotilla (Arellano and Casas, 2003), and Polaskia chende (Cruz and Casas, 2002). These studies revealed that environment influenced morphology of individuals, and some of them revealed that, in addition, under various management regimes within a given environment the plants have morphological differences, especially in characters targeted by artificial selection.…”

Globose cacti (Mammillaria) living on cliffs avoid high temperatures in a hot dryland of Southern Mexico

“…Being warmer at night may also have an impact on the night-time CO 2 fixation rate of M. crucigera. When compared to the plateau, the temperature regime of the plants in the cliff is closer to the optimum in other species, which is 23/13 1C (day/night) for Ferocactus acanthodes and Opuntia ficus-indica (Nobel, 1988), 25/15 1C for Stenocereus queretaroensis (Nobel and Pimienta-Barrios, 1995), and 30/20 1C for Hylocereus hundatus (Nobel and de la Barrera, 2002).…”