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外文期刊>Journal of Botany
>Low- and High-Temperature Tolerance and Acclimation for Chlorenchyma versus Meristem of the Cultivated CactiNopalea cochenillifera, Opuntia robusta,andSelenicereus megalanthus
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Low- and High-Temperature Tolerance and Acclimation for Chlorenchyma versus Meristem of the Cultivated CactiNopalea cochenillifera, Opuntia robusta,andSelenicereus megalanthus
Dividing meristematic cells are thought to be more sensitive to extreme temperatures compared to other tissues, such as chlorenchyma. This was examined for low and high temperatures for three widely cultivated cacti:Nopalea cochenillifera, Opuntia robusta, andSelenicereus megalanthus. Temperature tolerances of chlorenchyma and meristem were based on the cellular uptake of the vital stain neutral red for plants at mean dayight air temperatures of 25/20°C and plants maintained at 10/5°C or 45/40°C to examine temperature acclimation. Meristematic cells tolerated 1.8°C lower low temperatures and 4.0°C higher high temperatures than chlorenchyma cells for the three species at 25/20°C. Both tissue types showed acclimation, with a decrease or increase in temperature tolerated at 10/5°C or 45/40°C, respectively. Meristematic cells were more tolerant of extreme temperatures compared to chlorenchyma, contrary to the prevailing belief, and may reflect an additional strategy for cacti to survive extreme temperatures.
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