Plant temperature-based indices using infrared thermography for detecting water status in sesame under greenhouse conditions

Azar Khorsandi, Abbas Hemmat, Seyed Ahmad Mireei, Rasoul Amirfattahi and Parviz Ehsanzadeh

Agricultural Water Management, 2018, vol. 204, issue C, 222-233

Abstract: There have been studies on the effect of water stresses on leaf stomatal conductance (gs); however, the scientific reports on using non-contact techniques such as thermography for sesame (Sesamum indicum L.) are rare. The objectives of this study were hence to detect water status in sesame (genotype, “Naz-Takshakhe”) under greenhouse conditions using Crop Water Stress (CWSI) and stomatal conductance (Ig) Indices. One hundred and fifty pots were randomly assigned to three equal groups which were irrigated at soil water potential of −0.1 MPa (well-watered, WW), −1.0 MPa (moderate-water stressed, MWS), and −1.5 MPa (severe-water stressed, SWS). Four formulations of CWSI and two of Ig using canopy temperature (TC) from the WW treatment or temperature from a wet reference for the upper threshold and TC from the SWS treatment, temperature from a dry reference or air temperature plus 3° as the lower threshold were compared. Moreover, an additional CWSI and Ig formulations were also obtained by non-water stress baseline (NWSB) information using meteorological data. Furthermore, the relative water content (RWC) and gs were measured on the youngest and uppermost fully developed leaves of each pot. TC of MWS and SWS plants was higher than WW plants by 1.9 and 2.6 °C, respectively. A significant and linear relationship (P < 0.001) between CWSI/Ig and gs/RWC was found. Therefore, both physiological traits of gs and RWC can be estimated by temperature-based indices of CWSI/Ig. The results also showed the developed system enables us to estimate actual time variations in canopy temperatures. This study validates the effectiveness of using CWSI/Ig for non-destructive detection of water stress and estimation of relative water content in sesame.

Keywords: Stomatal conductance (gs); Crop water stress index (CWSI); Stomatal conductance index (Ig); Relative water content (RWC); Water stress; Drought (search for similar items in EconPapers)
Date: 2018
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Persistent link: https://EconPapers.repec.org/RePEc:eee:agiwat:v:204:y:2018:i:c:p:222-233

DOI: 10.1016/j.agwat.2018.04.012

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