Dataset Information

Modelling water use efficiency in a dynamic environment: An example using Arabidopsis thaliana.

ABSTRACT: Intrinsic water use efficiency (Wi), the ratio of net CO2 assimilation (A) over stomatal conductance to water vapour (gs), is a complex trait used to assess plant performance. Improving Wi could lead in theory to higher productivity or reduced water usage by the plant, but the physiological traits for improvement and their combined effects on Wi have not been clearly identified. Under fluctuating light intensity, the temporal response of gs is an order of magnitude slower than A, which results in rapid variations in Wi. Compared to traditional approaches, our new model scales stoma behaviour at the leaf level to predict gs and A during a diurnal period, reproducing natural fluctuations of light intensity, in order to dissect Wi into traits of interest. The results confirmed the importance of stomatal density and photosynthetic capacity on Wi but also revealed the importance of incomplete stomatal closure under dark conditions as well as stomatal sensitivity to light intensity. The observed continuous decrease of A and gs over the diurnal period was successfully described by negative feedback of the accumulation of photosynthetic products. Investigation into the impact of leaf anatomy on temporal responses of A, gs and Wi revealed that a high density of stomata produces the most rapid response of gs but may result in lower Wi.

SUBMITTER: Vialet-Chabrand S

PROVIDER: S-EPMC5038844 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Modelling water use efficiency in a dynamic environment: An example using Arabidopsis thaliana.

Vialet-Chabrand S S Matthews J S A JSA Brendel O O Blatt M R MR Wang Y Y Hills A A Griffiths H H Rogers S S Lawson T T

Plant science : an international journal of experimental plant biology 20160622

Intrinsic water use efficiency (Wi), the ratio of net CO2 assimilation (A) over stomatal conductance to water vapour (gs), is a complex trait used to assess plant performance. Improving Wi could lead in theory to higher productivity or reduced water usage by the plant, but the physiological traits for improvement and their combined effects on Wi have not been clearly identified. Under fluctuating light intensity, the temporal response of gs is an order of magnitude slower than A, which results i ...[more]

PMID: 27593464

Similar Datasets

Project description:There is growing evidence that for a comprehensive insight into the function of plant genes it is crucial to assess their functionalities under a wide range of conditions. In this study we examined the role of LESION SIMULATING DISEASE1 (LSD1), ENHANCED DISEASE SUSCEPTIBILITY1 (EDS1) and PHYTOALEXIN DEFICIENT4 (PAD4) in the regulation of photosynthesis, water use efficiency (WUE), ROS/hormonal homeostasis and seed yield in Arabidopsis thaliana grown in the laboratory and in the field. We demonstrate that the LSD1 null mutant (lsd1), which is known to exhibit a runaway cell death in non-permissive conditions, proves to be more tolerant to combined drought and high-light stress than the wild type. Moreover, depending on growing conditions, it shows variations in WUE, salicylic acid and hydrogen peroxide concentrations, photosystem II maximum efficiency and in transcription profiles. However, despite these changes, lsd1 demonstrates similar seed yield under all tested conditions. All of these traits depend on EDS1 and PAD4. The differences in the pathways prevailing in the lsd1 in various growing environments are manifested by the significantly smaller number of transcripts deregulated in the field compared to the laboratory, with only 43 commonly regulated genes. Our data indicate that LSD1, EDS1 and PAD4 participate in the regulation of various molecular and physiological processes that influence Arabidopsis fitness. On the basis of these results we emphasize that the function of such important regulators as LSD1, EDS1 and PAD4 should be studied not only under stable laboratory conditions, but also in the environment abounding in multiple stresses. Six genotypes x two conditions experiment including five-week-old WT (Ws), lsd1, pad4, eds1, eds1lsd1, and pad4lsd1 plants grown in laboratory or field conditions, hybridized in two loop-designs (lab and field). Two biological replicates. In total, 2 x 12 samples were hybridized on 24 Arabidopsis Gene Expression microarrays V4 (Agilent, two-color array) including color swap of replicate samples.

Dataset Information

Modelling water use efficiency in a dynamic environment: An example using Arabidopsis thaliana.

Publications

Modelling water use efficiency in a dynamic environment: An example using Arabidopsis thaliana.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure