As sessile organisms,plants are subject to a multitude of environmental variations including several which directly affect their interaction with the atmosphere.Given the indiscriminant nature of Rubisco,the relative ...As sessile organisms,plants are subject to a multitude of environmental variations including several which directly affect their interaction with the atmosphere.Given the indiscriminant nature of Rubisco,the relative rates of photosynthesis and photorespiration are known to be responsive to changes in gas composition.However,comprehensive profiling methods have not yet been applied in order to characterize the wider consequences of these changes on primary metabolism in general.Moreover,although transcriptional profiling has revealed that a subset of photorespiratory enzymes are co-expressed,whether transcriptional responses play a role in short-term responses to atmospheric compositional changes remains unknown.To address these questions,plants Arabidopsis thaliana（Arabidopsis） ecotype Columbia（Col-O） grown under normal air conditions were transferred to different CO_2 and O_2 concentrations and characterized at the physiological,molecular,and metabolic levels following this transition.The results reveal alterations in the components,which are directly involved in,or supporting,photorespiration,including transcripts and metabolite levels.The results further highlight that the majority of the regulation of these pathways is not mediated at the level of transcription and that the photorespiratory pathway is essential also in conditions in which flux through the pathway is minimized,yet suggest that flux through this pathway is not mediated at the level of transcription.展开更多
Microtubules are dynamic cytoskeletal structures essential for shaping cellular architecture and driving cell motility.Their tube-like structure typically comprises 13 protofilaments,each of which is formed of a/p tub...Microtubules are dynamic cytoskeletal structures essential for shaping cellular architecture and driving cell motility.Their tube-like structure typically comprises 13 protofilaments,each of which is formed of a/p tubulin heterodimers arranged in a head-to-tail manner(Howard,2001).The formation of microtubules primarily contains two processes.The first process in which soluble dimers start to form a growing microtubule is termed microtubule nucleation(Figure 1A).展开更多
Gibberellins （GAs） are involved in several growth and develop- mental processes ranging from stem elongation, leaf expansion, transition to flowering, pollen maturation, fruit set, and seed germination （Figure 1）.
基金supported by funding from the Max Planck 682 Society(W.L.A.,Z.N.,T.T.,and A.R.F.)the Deutsche Forschungsgemeinschaft as part of PROMICS research group 1186(A.F.,S.T.,H.B.,and A.R.F.)
文摘As sessile organisms,plants are subject to a multitude of environmental variations including several which directly affect their interaction with the atmosphere.Given the indiscriminant nature of Rubisco,the relative rates of photosynthesis and photorespiration are known to be responsive to changes in gas composition.However,comprehensive profiling methods have not yet been applied in order to characterize the wider consequences of these changes on primary metabolism in general.Moreover,although transcriptional profiling has revealed that a subset of photorespiratory enzymes are co-expressed,whether transcriptional responses play a role in short-term responses to atmospheric compositional changes remains unknown.To address these questions,plants Arabidopsis thaliana（Arabidopsis） ecotype Columbia（Col-O） grown under normal air conditions were transferred to different CO_2 and O_2 concentrations and characterized at the physiological,molecular,and metabolic levels following this transition.The results reveal alterations in the components,which are directly involved in,or supporting,photorespiration,including transcripts and metabolite levels.The results further highlight that the majority of the regulation of these pathways is not mediated at the level of transcription and that the photorespiratory pathway is essential also in conditions in which flux through the pathway is minimized,yet suggest that flux through this pathway is not mediated at the level of transcription.
文摘Microtubules are dynamic cytoskeletal structures essential for shaping cellular architecture and driving cell motility.Their tube-like structure typically comprises 13 protofilaments,each of which is formed of a/p tubulin heterodimers arranged in a head-to-tail manner(Howard,2001).The formation of microtubules primarily contains two processes.The first process in which soluble dimers start to form a growing microtubule is termed microtubule nucleation(Figure 1A).
文摘Gibberellins （GAs） are involved in several growth and develop- mental processes ranging from stem elongation, leaf expansion, transition to flowering, pollen maturation, fruit set, and seed germination （Figure 1）.
