Abstract
This study examined the vegetative and reproductive growth responses of the crassulacean acid metabolism (CAM) vine-cactus fruit crop species Hylocereus undatus and Selenicereus megalanthus to CO 2 enrichment (1000 μmol mol −1 vs. control of 380 μmol mol −1). H. undatus plants enriched with CO 2 demonstrated 52%, 22%, 18%, and 175% increases, relative to plants measured in ambient CO 2, in total daily net CO 2 uptake, shoot elongation, shoot dry mass, and number of reproductive buds, respectively. The responses of S. megalanthus plants exposed to elevated CO 2 were greater than those of H. undatus under the same conditions. Compared to plant responses in ambient CO 2, under conditions of CO 2 enrichment, S. megalanthus showed 129%, 73%, 68%, and 233% increases in total daily net CO 2 uptake, shoot elongation, shoot dry mass, and number of reproductive buds, respectively. Moreover, for H. undatus, there was no significant change in fruit fresh mass although it showed a slight (7%) upward trend. On the other hand, fruit fresh mass of S. megalanthus significantly increased by 63% in response to elevated CO 2. These results indicate the high potential of CAM plants to respond to CO 2 enrichment. It is thus apparent that S. megalanthus grown under CO 2 enrichment may benefit from elevated CO 2 to a greater extent than H. undatus grown under sub-optimal growth conditions.
Published Version
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