scholarly journals From facilitative to competitive interactions between woody plants and plants with crassulacean acid metabolism (CAM): The role of hydraulic descent

Ecohydrology ◽  
2016 ◽  
Vol 10 (3) ◽  
pp. e1799 ◽  
Author(s):  
Kailiang Yu ◽  
Paolo D'Odorico
Keyword(s):  
Woody Plants ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Competitive Interactions

Induction and reversal of crassulacean acid metabolism in Calandrinia polyandra: effects of soil moisture and nutrients

2011 ◽  
Vol 38 (7) ◽  
pp. 576 ◽  
Author(s):  
Klaus Winter ◽  
Joseph A. M. Holtum
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Co2 Fixation ◽  
Acid Metabolism ◽  
Co2 Exchange ◽  
Edaphic Conditions ◽  
Whole Plant ◽  
Negative Effect ◽  
Photosynthetic Plasticity ◽  
Dark Co2 Fixation

Calandrinia polyandra Benth. (Montiaceae), an annual succulent herb endemic to Australia, is an exemplary facultative crassulacean acid metabolism (CAM) plant as demonstrated by continuous whole-plant lifetime CO2 exchange measurements under controlled conditions in the laboratory. Reduced soil water availability induced a shift from solely daytime CO2 fixation to dark CO2 fixation. The shift from C3 photosynthesis to CAM was reversible either upon rewatering alone, or upon a combination of rewatering and addition of nutrients. These observations highlight the role of edaphic conditions in controlling CAM expression in a plant that has the option of fixing CO2 either during the day or during the night, providing further evidence that this extreme form of photosynthetic plasticity is primarily controlled by the environment rather than plant ontogeny. The stimulating effect of soil nutrients on CO2 fixation in the light and its negative effect on dark CO2 fixation have not been described previously and deserve further attention. In the most widely used CAM model system, the halophytic Mesembryanthemum crystallinum L., CAM is typically induced by high salinity, and some metabolic responses may be CAM-unrelated and related to salt stress per se. C. polyandra could be an excellent complementary system for studying the biochemical and molecular foundations of CAM because drought stress elicits a complete C3 to CAM transition.

scholarly journals The role of cis-elements in the evolution of crassulacean acid metabolism photosynthesis

2020 ◽  
Vol 7 (1) ◽  
Author(s):  
Li-Yu Chen ◽  
Yinghui Xin ◽  
Ching Man Wai ◽  
Juan Liu ◽  
Ray Ming
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Global Climate ◽  
Regulatory Elements ◽  
Promoter Regions ◽  
Leaf Tissues ◽  
Cam Species ◽  
Cam Photosynthesis ◽  
Selection Of

AbstractCrassulacean acid metabolism (CAM) photosynthesis is an innovation of carbon concentrating mechanism that is characterized by nocturnal CO2 fixation. Recent progresses in genomics, transcriptomics, proteomics, and metabolomics of CAM species yielded new knowledge and abundant genomic resources. In this review, we will discuss the pattern of cis-elements in stomata movement-related genes and CAM CO2 fixation genes, and analyze the expression dynamic of CAM related genes in green leaf tissues. We propose that CAM photosynthesis evolved through the re-organization of existing enzymes and associated membrane transporters in central metabolism and stomatal movement-related genes, at least in part by selection of existing circadian clock cis-regulatory elements in their promoter regions. Better understanding of CAM evolution will help us to design crops that can thrive in arid or semi-arid regions, which are likely to expand due to global climate change.

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