On the Evolutionary Origin of CAM Photosynthesis[OPEN]
نویسندگان
چکیده
Evolution of carbon concentrating mechanisms appears complex. In the case of C4 photosynthesis, an enabling mutation is thought to have formed an initial C4 cycle, which is then selected for flux, and, finally, high expression of photorespiratory genes is lost (for summary, see Bräutigam and Gowik, 2016). However, in the case of Crassulacean acid metabolism (CAM) photosynthesis, we suggest that evolution directly acts on a low flux pathway already in place for amino acid metabolism.We thus propose a true continuum fromC3 to CAM plants.
منابع مشابه
Shared origins of a key enzyme during the evolution of C4 and CAM metabolism
CAM and C4 photosynthesis are two key plant adaptations that have evolved independently multiple times, and are especially prevalent in particular groups of plants, including the Caryophyllales. We investigate the origin of photosynthetic PEPC, a key enzyme of both the CAM and C4 pathways. We combine phylogenetic analyses of genes encoding PEPC with analyses of RNA sequence data of Portulaca, t...
متن کاملEvolution along the crassulacean acid metabolism continuum
Crassulacean acid metabolism (CAM) is a specialised mode of photosynthesis that improves atmospheric CO2 assimilation in water-limited terrestrial and epiphytic habitats and in CO2-limited aquatic environments. In contrast with C3 and C4 plants, CAM plants take up CO2 from the atmosphere partially or predominantly at night. CAM is taxonomically widespreadamongvascular plants and is present inma...
متن کاملOptional use of CAM photosynthesis in two C4 species, Portulaca cyclophylla and Portulaca digyna.
Low levels of crassulacean acid metabolism (CAM) are demonstrated in two species with C4 photosynthesis, Portulaca cyclophylla and P. digyna. The expression of CAM in P. cyclophylla and P. digyna is facultative, i.e. optional. Well-watered plants did not accumulate acid at night and exhibited gas-exchange patterns consistent with C4 photosynthesis. CAM-type nocturnal acidification was reversibl...
متن کاملMultiple origins of crassulacean acid metabolism and the epiphytic habit in the Neotropical family Bromeliaceae.
The large Neotropical family Bromeliaceae presents an outstanding example of adaptive radiation in plants, containing a wide range of terrestrial and epiphytic life-forms occupying many distinct habitats. Diversification in bromeliads has been linked to several key innovations, including water- and nutrient-impounding phytotelmata, absorptive epidermal trichomes, and the water-conserving mode o...
متن کاملGenetic enablers underlying the clustered evolutionary origins of C4 photosynthesis in angiosperms.
The evolutionary accessibility of novel adaptations varies among lineages, depending in part on the genetic elements present in each group. However, the factors determining the evolutionary potential of closely related genes remain largely unknown. In plants, CO2-concentrating mechanisms such as C4 and crassulacean acid metabolism (CAM) photosynthesis have evolved numerous times in distantly re...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 2017