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

Vialet-Chabrand, S and Matthews, JSA and Brendel, O and Blatt, MR and Wang, Y and Hills, A and Griffiths, H and Rogers, S and Lawson, T (2016) 'Modelling water use efficiency in a dynamic environment: An example using Arabidopsis thaliana.' Plant Science, 251. 65 - 74. ISSN 0168-9452

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Intrinsic water use efficiency (W ), the ratio of net CO assimilation (A) over stomatal conductance to water vapour (g ), is a complex trait used to assess plant performance. Improving W 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 W have not been clearly identified. Under fluctuating light intensity, the temporal response of g is an order of magnitude slower than A, which results in rapid variations in W . Compared to traditional approaches, our new model scales stoma behaviour at the leaf level to predict g and A during a diurnal period, reproducing natural fluctuations of light intensity, in order to dissect W into traits of interest. The results confirmed the importance of stomatal density and photosynthetic capacity on W 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 g 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, g and W revealed that a high density of stomata produces the most rapid response of g but may result in lower W . i 2 s i i s i s i i s s i s i

Item Type: Article
Subjects: Q Science > QK Botany
S Agriculture > S Agriculture (General)
Divisions: Faculty of Science and Health > Life Sciences, School of
Depositing User: Tracy Lawson
Date Deposited: 31 Oct 2016 11:22
Last Modified: 31 Mar 2021 00:15

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