Use of Canopy Temperature Measurements as a Screening Tool for Drought Tolerance in Spring Wheat

1999 ◽  
Vol 182 (4) ◽  
pp. 231-238 ◽  
Author(s):  
A. Rashid ◽  
J. C. Stark ◽  
A. Tanveer ◽  
T. Mustafa
Keyword(s):  
Drought Tolerance ◽  
Spring Wheat ◽  
Screening Tool ◽  
Canopy Temperature ◽  
Temperature Measurements

scholarly journals Using Canopy Temperature Measurements to Evaluate Drought Tolerance of Potato Genotypes

1991 ◽  
Vol 116 (3) ◽  
pp. 412-415 ◽  
Author(s):  
Jeffrey C. Stark ◽  
Joseph J. Pavek ◽  
Ian R. McCann
Keyword(s):  
Drought Tolerance ◽  
Potential Evapotranspiration ◽  
Irrigation System ◽  
Canopy Temperature ◽  
Relative Sensitivity ◽  
Field Studies ◽  
Temperature Measurements ◽  
Wide Range ◽  
Tuber Bulking ◽  
Air Vapor Pressure Deficit

Field studies were conducted in 1986 and 1987 to evaluate the potential of using canopy temperature measurements to evaluate the relative drought tolerance of potato genotypes. In both years, 14 potato genotypes representing a relatively wide range of Solarium tuberosum L. germplasm were grown under well-watered [irrigation ≈100% potential evapotranspiration (ET) and stressed (irrigation ≈40% to 50% potential ET) coditions. Irrigation differences were imposed with a line source irrigation system. Canopy temperatures of the 14 genotypes were measured between 0900 and 1430 hr on 7 clear days during tuber bulking. A general linear relationship between canopy minus air temperature (ΔT) and air vapor pressure deficit (VPD) was determined for each year by regressing all ΔT data onto corresponding VPD values. The relative sensitivity of each genotype to changes in VPD was determined by regressing observed ΔT values onto the estimated ΔT from the general equation for that year. Genotypes with higher than average temperatures under well-watered conditions were generally less sensitive to changes in VPD than those with lower than average temperatures. Warmer genotypes under well-watered conditions were also generally less susceptible to drought than cooler genotypes. Thus, ΔT measurements from well-watered plots can be effectively used to assess the relative drought tolerance of potato genotypes.

scholarly journals Root Phenotyping for Drought Tolerance: A Review

Agronomy ◽  
2018 ◽  
Vol 8 (11) ◽  
pp. 241 ◽  
Author(s):  
Allah Wasaya ◽  
Xiying Zhang ◽  
Qin Fang ◽  
Zongzheng Yan
Keyword(s):  
Drought Tolerance ◽  
Crop Yield ◽  
Root Length ◽  
Root Length Density ◽  
Canopy Temperature ◽  
Specific Root Length ◽  
Root Traits ◽  
Three Dimensions ◽  
Invasive Approach ◽  
Root Phenotyping

Plant roots play a significant role in plant growth by exploiting soil resources via the uptake of water and nutrients. Root traits such as fine root diameter, specific root length, specific root area, root angle, and root length density are considered useful traits for improving plant productivity under drought conditions. Therefore, understanding interactions between roots and their surrounding soil environment is important, which can be improved through root phenotyping. With the advancement in technologies, many tools have been developed for root phenotyping. Canopy temperature depression (CTD) has been considered a good technique for field phenotyping of crops under drought and is used to estimate crop yield as well as root traits in relation to drought tolerance. Both laboratory and field-based methods for phenotyping root traits have been developed including soil sampling, mini-rhizotron, rhizotrons, thermography and non-soil techniques. Recently, a non-invasive approach of X-ray computed tomography (CT) has provided a break-through to study the root architecture in three dimensions (3-D). This review summarizes methods for root phenotyping. On the basis of this review, it can be concluded that root traits are useful characters to be included in future breeding programs and for selecting better cultivars to increase crop yield under water-limited environments.

scholarly journals Evaluation of drought tolerance of spring wheat lines in the Forest-Steppe of Ukraine

2016 ◽  
Vol 0 (110) ◽  
pp. 53-60
Author(s):  
О. А. Демидов ◽  
С. О. Хоменко ◽  
І. В. Федоренко ◽  
М. В. Федоренко
Keyword(s):  
Drought Tolerance ◽  
Spring Wheat ◽  
Forest Steppe ◽  
Wheat Lines

scholarly journals Canopy Temperature and Chlorophyll Content are Effective Measures of Drought Stress Tolerance in Durum Wheat

2018 ◽  
Vol 10 (4) ◽  
pp. 575-583 ◽  
Author(s):  
Fereshteh JOKAR ◽  
Rahmatollah KARIMIZADEH ◽  
Asad MASOUMIASL ◽  
Reza AMIRI FAHLIANI
Keyword(s):  
Drought Tolerance ◽  
Durum Wheat ◽  
Stress Tolerance ◽  
Chlorophyll Content ◽  
Geometric Mean ◽  
Canopy Temperature ◽  
Stress Conditions ◽  
Tolerance Index ◽  
Wheat Varieties ◽  
Drought Tolerant

Durum wheat (Triticum durum L.) is used for the preparation of multiple food products, including pasta and bread. Its production is restricted due to diverse environmental stresses i.e. drought and heat stress. Here, comparative analysis of durum wheat varieties was done by studying canopy temperature depression (CTD) and chlorophyll content (CHL), yield and yield contributing traits to evaluate their performance under stress and low stress conditions. Twelve durum wheat genotypes were studied under stressful and low-stress conditions in Gachsaran region of Iran. CTD and CHL were measured at two stages, from the emergence of fifty percent of inflorescence (ZGS 54) to watery ripe stage (ZGS 71). According to stress tolerance index (STI), mean productivity (MP) and geometric mean productivity (GMP) indices, genotype G10 exhibited the most, while genotype G6, the least relative tolerance, respectively. Based on MP and GMP, genotype G10 was found to be drought tolerant, while genotype G2 displayed the lowest amount of MP and GMP. Therefore these genotypes are recommended to be used as genitors in artificial hybridization for improvement of drought tolerance in other cultivars. All indices had high correlation with grain yield under stress and non-stress condition, indicating more suitability of these indices for selection of resistant genotype. Results of the present study showed that among drought tolerance indices, harmonic mean (HM), GMP, CTD and modified STI index (K2STI) can be used as the most suitable indicators for screening drought tolerant cultivars.

Modal Analysis of Flange-Mounted Thermowells

2019 ◽  
Vol 141 (6) ◽  
Author(s):  
Dave Bartran
Keyword(s):  
At Risk ◽  
Modal Analysis ◽  
Screening Tool ◽  
Beam Theory ◽  
Temperature Measurements ◽  
Failure Risk

Abstract Avoidance of flow-induced resonance is crucial in managing the failure risk of industrial temperature measurements. To this end, we find that modal analysis of thermowell installations using traditional shell and beam theory, may offer a useful screening tool for at risk installations. This is demonstrated in part by a comparison of predicted resonances of flange-mounted thermowells with those described in reported flow tests.

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