Shared Expression of Crassulacean Acid Metabolism (CAM) Genes Pre-dates the Origin of CAM in the Genus Yucca
Overview
Authors
Affiliations
Crassulacean acid metabolism (CAM) is a carbon-concentrating mechanism that has evolved numerous times across flowering plants and is thought to be an adaptation to water-limited environments. CAM has been investigated from physiological and biochemical perspectives, but little is known about how plants evolve from C3 to CAM at the genetic or metabolic level. Here we take a comparative approach in analyzing time-course data of C3, CAM, and C3+CAM intermediate Yucca (Asparagaceae) species. RNA samples were collected over a 24 h period from both well-watered and drought-stressed plants, and were clustered based on time-dependent expression patterns. Metabolomic data reveal differences in carbohydrate metabolism and antioxidant response between the CAM and C3 species, suggesting that changes to metabolic pathways are important for CAM evolution and function. However, all three species share expression profiles of canonical CAM pathway genes, regardless of photosynthetic pathway. Despite differences in transcript and metabolite profiles between the C3 and CAM species, shared time-structured expression of CAM genes in both CAM and C3Yucca species suggests that ancestral expression patterns required for CAM may have pre-dated its origin in Yucca.
Bekki S, Suetsugu K, Kobayashi K J Plant Res. 2024; 138(2):323-336.
PMID: 39718758 DOI: 10.1007/s10265-024-01608-2.
Transcriptomic Analysis of the CAM Species Under Low- and High-Temperature Regimes.
Hu R, Zhang J, Jawdy S, Sreedasyam A, Lipzen A, Wang M Plants (Basel). 2024; 13(23).
PMID: 39683237 PMC: 11644069. DOI: 10.3390/plants13233444.
Siadjeu C, Kadereit G BMC Genomics. 2024; 25(1):688.
PMID: 39003461 PMC: 11245778. DOI: 10.1186/s12864-024-10553-2.
CAM evolution is associated with gene family expansion in an explosive bromeliad radiation.
Groot Crego C, Hess J, Yardeni G, de La Harpe M, Priemer C, Beclin F Plant Cell. 2024; 36(10):4109-4131.
PMID: 38686825 PMC: 11449062. DOI: 10.1093/plcell/koae130.
Perron N, Kirst M, Chen S Plant Commun. 2023; 5(3):100772.
PMID: 37990498 PMC: 10943566. DOI: 10.1016/j.xplc.2023.100772.