Suitability of Canopy Temperature Depression in a Temperate Climate with Drought-Stressed Winter Rye, Determined with Three Infrared Measurement Devices

2013 ◽  
Vol 199 (6) ◽  
pp. 385-394 ◽  
Author(s):  
L. Kottmann ◽  
S. Schittenhelm ◽  
K.-P. Wittich ◽  
P. Wilde
Keyword(s):  
Canopy Temperature ◽  
Temperate Climate ◽  
Winter Rye ◽  
Canopy Temperature Depression ◽  
Infrared Measurement ◽  
Measurement Devices ◽  
Temperature Depression

scholarly journals Suitability of Canopy Temperature Depression, Specific Leaf Area, and SPAD Chlorophyll Reading for Genotypic Comparison of Peanut Grown in a Sub-humid Environment

2014 ◽  
Vol 41 (2) ◽  
pp. 100-110 ◽  
Author(s):  
D. Singh ◽  
M. Balota ◽  
T. G. Isleib ◽  
E. Collakova ◽  
G. E. Welbaum
Keyword(s):  
Leaf Area ◽  
Water Deficit ◽  
Specific Leaf Area ◽  
Canopy Temperature ◽  
Physiological Characteristics ◽  
Growth Stages ◽  
Pod Yield ◽  
Humid Environment ◽  
Canopy Temperature Depression ◽  
Temperature Depression

ABSTRACT Peanut (Arachis hypogaea L.) is mostly grown under rainfed production with water deficit being the major limiting factor. Several physiological characteristics have been proposed as surrogates for yield and genotypic selection under water deficit in arid climates, but their suitability for selection under sub-humid rainfed production where water deficit can also occur is not clear. Canopy temperature depression (CTD), specific leaf area (SLA), and SPAD chlorophyll reading of eight virginia-type peanut genotypes were evaluated at three growth stages in field trials involving rainfed and irrigated plants in sub-humid environments in northeastern Virginia-Carolina (VC) region in 2011 and 2012. Significant (p≤0.05) variation in pod yield and all physiological characteristics was observed in response to water regime in both years. Rainfed plants had warmer (CTD 2.2 vs. 3.1 °C) and greener canopies in 2011 but cooler (CTD 3.9 vs. 2.2 °C) and less green canopies in 2012 than the irrigated plants. Compared to irrigated plants, rainfed plants had slightly increased SLA in 2011 (135 vs. 131 cm2 g−1), but decreased SLA in 2012 (133 vs. 144 cm2 g−1). Differences (p≤0.05) among genotypes were observed for pod yield, SLA, and SPAD chlorophyll reading, but not for CTD. Among the physiological characteristics, only SPAD chlorophyll readings were significantly correlated to pod yield in all water regimes and growth stages in 2012, but not in 2011. Based on these results, CTD, SLA, and SPAD chlorophyll reading appear to be unsuited for genotypic selection for yield and water-deficit tolerance for peanut grown in sub-humid environment of the Virginia-Carolina region in part due to unpredictable rainfall amount and distribution. For reproducible field evaluations, additional methods will have to be used such as use of rain exclusion shelters.

scholarly journals Physiological Efficiency of Sugarcane Clones under Water-Limited Conditions

2020 ◽  
Vol 63 (1) ◽  
pp. 133-140
Author(s):  
Raja Arun kumar ◽  
Srinivasavedantham Vasantha ◽  
Arjun S. Tayade ◽  
Sheriff Anusha ◽  
Ponmani Geetha ◽  
...  
Keyword(s):  
Chlorophyll Fluorescence ◽  
Irrigation Water ◽  
Canopy Temperature ◽  
Water Security ◽  
Physiological Traits ◽  
Cane Yield ◽  
Leaf Rolling ◽  
Sugarcane Production ◽  
Canopy Temperature Depression ◽  
Temperature Depression

Highlights`Significant reductions in canopy temperature depression (CTD), chlorophyll fluorescence (Fv/Fm), SPAD index, and leaf rolling index were observed under limited irrigation during the grand growth stage of sugarcane.This study highlights the significance of CTD and Fv/Fm as useful physiological tools for selecting sugarcane clones suitable for production under water-limited conditions.Clones Co 10026, Co 13006, Co 85019, Co 62175, Co 86010, and Co 1148 performed better under limited irrigation, and these clones can reduce the amount of irrigation water required for sugarcane production, ensuring water security.Abstract. Sugarcane is one the most important commercial crops in India and globally. The annual water requirement for sugarcane ranges from about 1000 to 2900 mm, and this variation mainly depends on the agro-ecological conditions, cultivation practices, and crop cycle. In a changing climate, the delay or failure of monsoons will have a direct effect on the water available for irrigation in India. Given these constraints, sustaining sugarcane production is challenging. The ICAR-Sugarcane Breeding Institute (ICAR-SBI) in Coimbatore, India, has developed sugarcane genotypes that are resilient to drought stress. To study the role of physiological traits in identifying sugarcane varieties suitable for water-limited conditions, an experiment was conducted at ICAR-SBI with sugarcane clones in field conditions using irrigation at 100% cumulative pan evaporation (I0) and with 50% reductions in the volume and frequency of irrigation (I2). Physiological traits, including canopy temperature depression (CTD), chlorophyll fluorescence (Fv/Fm), soil plant analysis development (SPAD) index, leaf rolling index (LRI), and cane yield, were recorded for sugarcane clones grown under I0 and I2. Significant reductions of 85.9%, 15.4%, 4.9%, 44.9%, and 56.0%, respectively, in CTD, Fv/Fm, SPAD index, LRI, and cane yield were found for water-limited conditions (I2) compared to I0. Fv/Fm showed a decreasing trend in I2 compared to I0 and also showed a significant positive correlation (r = 0.43) with cane yield. CTD varied significantly between the two treatments and also showed a significant positive correlation with cane yield (r = 0.45). Both Fv/Fm and CTD are adaptive traits for water-limited conditions and are useful for screening sugarcane clones suitable for water-limited conditions. Clones Co 10026, Co 13006, Co 85019, Co 62175, and Co 86010 had superior cane yields under water-limited conditions (I2) and better physiological traits. Water deficit is one of the most critical abiotic stresses that affect sugarcane productivity. By growing clones that are water use efficient (Co 10026, Co 13006, Co 85019, Co 62175, and Co 86010), the irrigation water requirement can be reduced for sugarcane production in India. In addition, new sugarcane clones can be developed for water-limited conditions by using the identified clones in breeding programs for water use efficiency, and water security can be achieved for sugarcane grown tropical and sub-tropical areas of India. Keywords: Canopy temperature, Chlorophyll fluorescence, Global water security, Irrigation, Water productivity

Plant water relations and canopy temperature depression for assessing water stress tolerance of potato

2015 ◽  
Vol 21 (1) ◽  
pp. 56-63 ◽  
Author(s):  
Abdullah-Al Mahmud ◽  
M. Mofazzal Hossain ◽  
M. Abdul Karim ◽  
M. A. Khaleque Mian ◽  
Mohammad Zakaria ◽  
...  
Keyword(s):  
Water Stress ◽  
Stress Tolerance ◽  
Water Relations ◽  
Canopy Temperature ◽  
Plant Water Relations ◽  
Plant Water ◽  
Water Stress Tolerance ◽  
Canopy Temperature Depression ◽  
Temperature Depression
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