Journal article
Evaluation of water-use efficiency in foxtail millet (Setaria italica) using visible-near infrared and thermal spectral sensing techniques
Talanta (Oxford), Vol.152(C), pp.531-539
05/15/2016
Handle:
https://hdl.handle.net/2376/104473
PMID: 26992551
Abstract
Water limitations decrease stomatal conductance (gs) and, in turn, photosynthetic rate (Anet), resulting in decreased crop productivity. The current techniques for evaluating these physiological responses are limited to leaf-level measures acquired by measuring leaf-level gas exchange. In this regard, proximal sensing techniques can be a useful tool in studying plant biology as they can be used to acquire plant-level measures in a high-throughput manner. However, to confidently utilize the proximal sensing technique for high-throughput physiological monitoring, it is important to assess the relationship between plant physiological parameters and the sensor data. Therefore, in this study, the application of rapid sensing techniques based on thermal imaging and visual-near infrared spectroscopy for assessing water-use efficiency (WUE) in foxtail millet (Setaria italica (L.) P. Beauv) was evaluated. The visible-near infrared spectral reflectance (350–2500nm) and thermal (7.5–14µm) data were collected at regular intervals from well-watered and drought-stressed plants in combination with other leaf physiological parameters (transpiration rate-E, Anet, gs, leaf carbon isotopic signature-δ13Cleaf, WUE). Partial least squares regression (PLSR) analysis was used to predict leaf physiological measures based on the spectral data. The PLSR modeling on the hyperspectral data yielded accurate and precise estimates of leaf E, gs, δ13Cleaf, and WUE with coefficient of determination in a range of 0.85–0.91. Additionally, significant differences in average leaf temperatures (~1°C) measured with a thermal camera were observed between well-watered plants and drought-stressed plants. In summary, the visible-near infrared reflectance data, and thermal images can be used as a potential rapid technique for evaluating plant physiological responses such as WUE.
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•Visible-near infrared and thermal spectral data was used to assess plant physiology.•Partial least square regression model was developed to analyze multivariate data.•Model yielded accurate estimates of transpiration rates and stomatal conductance.•Vis-NIR and thermal spectral data can be rapid technique to evaluate plant responses.
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Details
- Title
- Evaluation of water-use efficiency in foxtail millet (Setaria italica) using visible-near infrared and thermal spectral sensing techniques
- Creators
- Meng Wang - Department of Biological System Engineering, Washington State University, 1935 E. Grimes Way, PO Box 646120, Pullman, WA 99164, United StatesPatrick Z Ellsworth - School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA 99164, United StatesJianfeng Zhou - Department of Biological System Engineering, Washington State University, 1935 E. Grimes Way, PO Box 646120, Pullman, WA 99164, United StatesAsaph B Cousins - School of Biological Sciences, Washington State University, PO Box 644236, Pullman, WA 99164, United StatesSindhuja Sankaran - Department of Biological System Engineering, Washington State University, 1935 E. Grimes Way, PO Box 646120, Pullman, WA 99164, United States
- Publication Details
- Talanta (Oxford), Vol.152(C), pp.531-539
- Academic Unit
- Biological Systems Engineering, Department of; Biological Sciences, School of
- Publisher
- Elsevier B.V
- Identifiers
- 99900546971301842
- Language
- English
- Resource Type
- Journal article