Using Plant Temperature to Evaluate the Response of Stomatal Conductance to Soil Moisture Deficit

Yu, Minghan; Ding, Guodong; Gao, Guanglei; Zhao, Yuanyuan; Yan, Lei; Sai, Ke

doi:10.3390/f6103748

Cited by 32 publications

(22 citation statements)

References 23 publications

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“…Between these two parameters, a logarithmic significant relationship was found (Figure 3). This result, obtained for tomato grown under open field conditions and subjected to deficit irrigation, is similar to that obtained by Yu et al [16] who used Firmiana platanifolia (L.) grown in an incubator to develop a better understanding of the relationship between canopy temperature and stomatal conditions at various water stress levels. used Firmiana platanifolia (L.) grown in an incubator to develop a better understanding of the relationship between canopy temperature and stomatal conditions at various water stress levels.…”

Section: Physiological Quantitative and Qualitative Parameterssupporting

confidence: 75%

“…CWSI is an index based on leaf temperature and associated with changes in crop water status [16]; it can vary between zero, indicating optimal crop water status, and one, indicating high crop water stress. Significant difference (p ≤ 0.05) in CWSI mean values was found between the two growing seasons (0.49 vs. 0.43 for GS 1 and GS 2 , respectively).…”

Section: Physiological Quantitative and Qualitative Parametersmentioning

confidence: 99%

“…The crop water stress index (CWSI) is one of the most used crop indices, based on thermal data from the canopy [14,15]. In the literature, changes in CWSI were significantly associated with changes in water status [16]. Under water stress conditions, plants tend to reduce their transpiration rate, closing their stomata, which also reduces the plant's transpiration cooling ability, causing an increase in leaf temperature.…”

Section: Introductionmentioning

confidence: 99%

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Deficit Irrigation and Partial Root-Zone Drying Techniques in Processing Tomato Cultivated under Mediterranean Climate Conditions

et al. 2017

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Due to climate change, the application of water saving strategies is of particular interest. The aim of this study was to evaluate the effects of deficit irrigation (DI) and partial root-zone drying (PRD) techniques on the crop water stress index (CWSI), water use efficiency (WUE), and quality parameters in processing tomatoes grown in open field conditions in a Mediterranean climate. Two cultivars were grown for two growing seasons under four irrigation regimes as follows: (i) IR 100 : full irrigation by restoring 100% of the maximum tomato evapotranspiration (ET c ); (ii) IR 70DI : 70% of the amount of water given to the IR 100 ; (iii) IR 70PRD : 70% of the amount of water given to the IR 100 by applying partial root-zone drying and (iv) IR 0 : irrigation only at transplanting and during fertigation. During the flowering period, the first growing season was characterized by an absence of rainfall and by higher temperatures also showing a higher CWSI. Despite, under IR 70PRD , the CWSI was significantly higher than under IR 70DI , the marketable yield obtained was significantly higher. Both IR 70DI and IR 70PRD regimes received approximately 24% less water than IR 100 , but the yield reduction with relation to the optimum regime was equal to 16.2% under IR 70DI , and only 7.6% under IR 70PRD . The WUE increment of IR 70PRD with respect to IR 100 was equal to 27% in the first growing season and to 17% in the second one, showing that the positive effect of PRD on the WUE is more evident in the more stressed year. Finally, the results from the principal component analysis (PCA) showed that the two cultivars had different qualitative responses in the two extreme regimes (IR 100 and IR 0 ) but not under PRD and DI regimes.

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Section: Physiological Quantitative and Qualitative Parameterssupporting

confidence: 75%

Section: Physiological Quantitative and Qualitative Parametersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Deficit Irrigation and Partial Root-Zone Drying Techniques in Processing Tomato Cultivated under Mediterranean Climate Conditions

et al. 2017

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“…Moreover, CWSI and I g dynamics, similar in both experiments and for all treatments, seem to be strongly related to the patterns of soil water content, leaf water content and stomatal conductance. The maximum value of CWSI reached in this study is similar to that obtained over stressed plants of different species by Yu et al [46]. The literature does not provide a specific value of CWSI for an irreversible water stress condition, but it widely agrees that soil water scarcity jeopardizes the physiological response of plants when CWSI is greater than 0.85 [47].…”

Section: Crop Water Status and Spectral Indicessupporting

confidence: 74%

Assessing the Reliability of Thermal and Optical Imaging Techniques for Detecting Crop Water Status under Different Nitrogen Levels

et al. 2017

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Efficient management of irrigation water is fundamental in agriculture to reduce the environmental impacts and to increase the sustainability of crop production. The availability of adequate tools and methodologies to easily identify the crop water status in operating conditions is therefore crucial. This work aimed to assess the reliability of indices derived from imaging techniques-thermal indices (I g (stomatal conductance index) and CWSI (Crop Water Stress Index)) and optical indices (NDVI (Normalized Difference Vegetation Index) and PRI (Photochemical Reflectance Index))-as operational tools to detect the crop water status, regardless the eventual presence of nitrogen stress. In particular, two separate experiments were carried out in a greenhouse, on two spinach varieties (Verdi F1 and SV2157VB), with different microclimatic conditions and under different levels of water and nitrogen application. Statistical analysis based on ANOVA test was carried out to assess the independence of thermal and optical indices from the crop nitrogen status. These imaging indices were successively compared through correlation analysis with reference destructive and non-destructive measurements of crop water status (stomatal conductance, chlorophyll a fluorescence, and leaf and soil water content), and linear regression models of thermal and optical indices versus reference measurements were calibrated. All models were significant (Fisher p-value lower than 0.05), and the highest R 2 values (greater than 0.6) were found for the regression models between CWSI and the soil water content, NDVI and the leaf water content, and PRI and the stomatal conductance. Further analysis showed that imaging indices acquired by thermal cameras (especially CWSI) can be used as operational tools to detect the crop water status, since no dependence on plant nitrogen conditions was observed, even when the soil water depletion was very limited. Our results confirmed that imaging indices such as CWSI, NDVI and PRI can be used as operational tools to predict soil water status and to detect drought stress under different soil nitrogen conditions.

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“…It was reported that maintenance of lower leaf surface temperature in tolerant genotypes during stress conditions could lead to favourable water status, sustained transpiration and increased photosynthetic efficiency, resulting in improved yields (Kumar 2005). Using leaf temperature as drought index has been reported in potato (Gerhards et al 2016), maize (Carroll et al 2017), sorghum (Blume et al 1978), wheat (Fischer et al 1998, Talebi 2011, sugarcane (Silva et al 2007), rice (Hirayama et al 2006) and Firmiana platanifolia (Yu et al 2015). However, in woody perennials leaf surface temperature as water stress index is of limited use.…”

Section: Discussionmentioning

confidence: 99%

Variation in morpho-physiological, biochemical and molecular responses of two Eucalyptus species under short-term water stress

Amrutha

Parveen

Muthupandi

et al. 2019

Acta Botanica Croatica

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The genus Eucalyptus occurs in a wide range of environmental conditions, including rainforests, subal-pine, arid/semi-arid and moist temperate zones. It includes species with the capacity to cope with extremely low water potential. This study aims to screen water stress tolerance in two Eucalyptus species under nursery conditions. Inter-specific variation in morphological, physiological, biochemical and molecular parameters in two Eucalyptus species (E. tereticornis and E. camaldulensis) with contrasting levels of tolerance to progressive short term water-deprived condition was evaluated. Water stress reduced growth measured in terms of root:shoot ratio and specific leaf area (SLA), photosynthetic parameters, leaf water potential and relative water content (RWC) in both genotypes. Biochemical parameters including total sugars, phenol, phytohormones (indole acetic acid and abscisic acid) and proline were found to significantly increase during stress in both genotypes. Water responsive transcripts like osmotin and DREB/CBF registered significant expression variation in the two genotypes, suggesting their key role in regulating water stress tolerance in Eucalyptus.

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Using Plant Temperature to Evaluate the Response of Stomatal Conductance to Soil Moisture Deficit

Cited by 32 publications

References 23 publications

Deficit Irrigation and Partial Root-Zone Drying Techniques in Processing Tomato Cultivated under Mediterranean Climate Conditions

Deficit Irrigation and Partial Root-Zone Drying Techniques in Processing Tomato Cultivated under Mediterranean Climate Conditions

Assessing the Reliability of Thermal and Optical Imaging Techniques for Detecting Crop Water Status under Different Nitrogen Levels

Variation in morpho-physiological, biochemical and molecular responses of two Eucalyptus species under short-term water stress

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