scholarly journals Identification of Drought Tolerant Genotypes in Dryland Wheat using Drought Tolerance Indices

2018 ◽  
Vol 10 (28) ◽  
pp. 13-26
Author(s):  
Morteza Kamrani ◽  
Asghar Mehraban ◽  
Manoochehr Shiri ◽  
◽  
◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Tolerance Indices

Identification of Drought-Tolerant Co-canes Based on Physiological Traits, Yield Attributes and Drought Tolerance Indices

Sugar Tech ◽  
2021 ◽  
Author(s):  
Pooja Dhansu ◽  
Neeraj Kulshreshtha ◽  
Ravinder Kumar ◽  
Arun K. Raja ◽  
S. K. Pandey ◽  
...  
Keyword(s):  
Drought Tolerance ◽  
Physiological Traits ◽  
Yield Attributes ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Tolerance Indices

scholarly journals Physiological Screening for Drought Tolerance Traits in Vegetable Amaranth (Amaranthus tricolor) Germplasm

Agriculture ◽  
2021 ◽  
Vol 11 (10) ◽  
pp. 994
Author(s):  
Norain Jamalluddin ◽  
Festo J. Massawe ◽  
Sean Mayes ◽  
Wai Kuan Ho ◽  
Ajit Singh ◽  
...  
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Geometric Mean ◽  
Tolerance Index ◽  
Genotypic Differences ◽  
Amaranthus Tricolor ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Tolerance Indices ◽  
Screening Trials

Amaranth (Amaranthus tricolor), an underutilized climate smart crop, is highly nutritious and possesses diverse drought tolerance traits, making it an ideal crop to thrive in a rapidly changing climate. Despite considerable studies on the growth and physiology of plants subjected to drought stress, a precise trait phenotyping strategy for drought tolerance in vegetable amaranth is still not well documented. In this study, two drought screening trials were carried out on 44 A. tricolor accessions in order to identify potential drought-tolerant A. tricolor germplasm and to discern their physiological responses to drought stress. The findings revealed that a change in stem biomass was most likely the main mechanism of drought adaptation for stress recovery, and dark-adapted quantum yield (Fv/Fm) could be a useful parameter for identifying drought tolerance in amaranth. Three drought tolerance indices: geometric mean productivity (GMP), mean productivity (MP) and stress tolerance index (STI) identified eight drought-tolerant accessions with stable performance across the two screening trials. The highly significant genotypic differences observed in several physiological traits among the amaranth accessions indicate that the amaranth panel used in this study could be a rich source of genetic diversity for breeding purposes for drought tolerance traits.

scholarly journals Evaluation of Selection Indices for Drought Tolerance in Some Chickpea (Cicer Arietinum L.) Genotypes

2014 ◽  
Vol 17 (1) ◽  
pp. 6-12 ◽  
Author(s):  
Naser Sabaghnia ◽  
Mohsen Janmohammadi
Keyword(s):  
Drought Tolerance ◽  
Strong Correlation ◽  
Crop Production ◽  
Block Design ◽  
Stressed Condition ◽  
Potential Yield ◽  
Drought Tolerant ◽  
Selection Indices ◽  
Drought Tolerance Indices ◽  
Tolerance Indices

Abstract Drought is one of the major abiotic stresses in agriculture worldwide, which limits crop production. The chickpea cultivation areas of Iran are fourth in the world after India, Pakistan and Turkey while most areas (95 %) are planted in rainfed condition and are grown in rotation with cereals. This investigation was carried out to investigate the effect of drought stress seed yield characteristic in seven genotypes of chickpea. A field experiment with two humidity regimes (stressed and non-stressed) was performed in a randomized complete block design layout with three replicates. The analysis of variance for both potential yield (YP) and stress yield (YS) indicated significant differences among seven chickpea genotypes. Also, significant differences were observed among chickpea genotypes regarding twelve drought tolerance indices. Based on the YP, the genotypes FLIP 03-64C, FLIP 98-106C, Arman and Azad had the highest yield under non-stressed condition, while the genotypes FLIP 98-106C and Azad displayed the highest yield under stressed condition. Therefore, the genotypes FLIP 98-106C and Azad are good candidates for commercial recommendation to farmers in both rainfed and irrigated conditions. The relationships among drought tolerance indices are graphically displayed in a plot of two first principal components analysis. The first and second components justified 95.46 % of the variations between criteria (59.36 and 36.10 % for PC1 and PC2, respectively). The STI, K1STI, MP, GMP and PI indices exhibited strong correlation with YP, while YI showed strong correlation with YS; therefore, YS can discriminate drought tolerant genotypes with high grain yield under stress conditions.

scholarly journals Evaluation of Drought Tolerance Indices for Screening Some of Corn (Zea mays L.) Cultivars under Environmental Conditions

2013 ◽  
Vol 5 (3) ◽  
pp. 388-393 ◽  
Author(s):  
Mohhamad Reza NAGHAVI ◽  
Alireza POUR ABOUGHADAREH ◽  
Marouf KHALILI
Keyword(s):  
Zea Mays ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Zea Mays L ◽  
Stress Conditions ◽  
Tolerance Index ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Stress Susceptibility ◽  
Tolerance Indices

In order to study the effect of drought stress on eight cultivars corn (Zea mays L.), an experiment was conducted in a factorial experimental on the basis of randomized complete block design under two irrigated conditions during 2010-2011 cropping season. Twelve drought tolerance/resistance indices including stress tolerance index (STI), stress susceptibility index (SSI), tolerance index (TOL), geometric mean production (GMP), mean production (MP), yield index (YI), yield stability index (YSI), drought resistance index (DI), relative drought index (RDI), stress susceptibility percentage index (SSPI) and modified stress tolerance (K1STI and K2STI) were calculated based on grain yield under drought and irrigated conditions. Yield in stress and non-stress conditions were significantly and positively correlated with STI, GMP, MP, YI, TOL, DI, RDI, YSI, SSPI, K1STI, and K2STI and negatively correlated with SSI. Yield in stress and non-stress conditions were significantly and positively correlated with STI, GMP, MP, YI, TOL, DI, RDI, YSI, SSPI, K1STI, and K2STI and negatively correlated with SSI. Screening drought tolerant cultivars using ranking method, three dimensional plots discriminated cultivars ‘KSC720’, KSC 710GT and ‘KSC 700’ as the most drought tolerant. Cluster analysis classified the cultivars into three groups i.e., tolerant, susceptible and semi-susceptible to drought conditions. In general, Results of this study showed that among drought tolerance indices STI, YI, SSPI, K1STI, and K2STI can be used as the most suitable indicators for screening drought tolerant cultivars and ‘KSC720’, KSC 710 GT and ‘KSC 700’ had the highest tolerance to drought in our studies condition.

Drought-tolerance indices in a tall fescue population and its polycross progenies

2012 ◽  
Vol 63 (4) ◽  
pp. 360 ◽  
Author(s):  
Maryam Ebrahimiyan ◽  
Mohammad Mahdi Majidi ◽  
Aghafakhr Mirlohi ◽  
Mahdi Gheysari
Keyword(s):  
Soil Moisture ◽  
Drought Tolerance ◽  
Tall Fescue ◽  
Moisture Stress ◽  
Forage Yield ◽  
Soil Moisture Stress ◽  
Drought Tolerant ◽  
Second Year ◽  
Drought Tolerance Indices ◽  
Tolerance Indices

Development of drought-tolerant cultivars is hampered by a lack of effective selection criteria. In this research, drought tolerance of 75 genotypes of tall fescue in three sets (25 parental, 25 early, 25 late-flowering progenies) was evaluated under no soil moisture stress and soil moisture stress in the field during 2009 and 2010. Five drought-tolerance indices were calculated: stress tolerance (TOL), mean productivity (MP), geometric mean productivity (GMP), stress susceptibility index (SSI), and stress tolerance index (STI). These calculations were based on forage yield (dry matter basis) under drought (Ys) and non-drought (Yp) conditions. Soil moisture stress caused significant reduction in forage yield. Considerable genetic variation for drought tolerance was found among genotypes. A moderately high relationship was found between Yp and Ys using regression analysis, with a clear relationship in the second year. Indices GMP and STI were found to be valuable aids in the selection of drought-tolerant, high-yielding genotypes. Plots of the first and second principal components identified drought-tolerant genotypes in each set. Results indicated that selection for drought-tolerant genotypes should be planned separately for first year (establishment stage) and second year (productive stage) in tall fescue.

scholarly journals Multi-Environment Screening of Durum Wheat Genotypes for Drought Tolerance in Changing Climatic Events

Agronomy ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 875
Author(s):  
Sourour Ayed ◽  
Afef Othmani ◽  
Imen Bouhaouel ◽  
Jaime A. Teixeira da Silva
Keyword(s):  
Drought Tolerance ◽  
Durum Wheat ◽  
Geometric Mean ◽  
Principal Component ◽  
Tolerance Index ◽  
Wheat Genotypes ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Tolerance Indices ◽  
Modern Varieties

Durum wheat is the most widely grown cereal in Tunisia, but its production is threatened by drought, which is exacerbated by climate change. This study aimed to identify drought-tolerant durum wheat genotypes from five modern varieties and six landraces in a multi-environment trial at two sites (Kef and Siliana, Tunisia) during three growing seasons under rainfed and irrigated conditions. Six drought tolerance indices (mean productivity (MP), geometric mean productivity (GMP), stress susceptibility index (SSI), tolerance index (TOL), stress tolerance index (STI), and yield stability index (YSI)) were used to evaluate the 11 genotypes. The environment was the dominant source of variation for grain yield (GY; 94.27%), followed by the environment × genotype interaction (4.06%) and genotype (1.65%). Cluster analysis based on GY identified four environment-based groups with distinct water treatments, extreme minimum/maximum temperatures, and rainfall. Principal component analysis and a correlation matrix revealed that drought tolerance indices significantly correlated with GY in non-stressed and stressed conditions and could be separated into four groups. Based on STI, MP, and GMP, G6 and G8 (landraces) were the most drought-tolerant genotypes attaining high GY in both conditions. TOL was able to discriminate G1, G3, and G5 (modern varieties) as well as drought-susceptible genotypes, all of which were suitable for irrigation. Genotypes G7, G9, G10, and G11 (landraces), which had high SSI and lowest STI, MP, GMP, and YSI values, were susceptible to drought and were thus not suitable for cultivation in both conditions. Finally, G2 and G4 (modern varieties), which had an intermediate rank for different indices, were classified as semi-tolerant or sensitive genotypes. Drought tolerance indices and genotype ranks were helpful tools to screen drought-tolerant genotypes with a large adaptation to a range of environments, namely irrigated and rainfed conditions (landraces G6 and G8), or genotypes with the ability to adapt (modern varieties G1, G3, and G5) to irrigated conditions.

scholarly journals Short Communication: Evaluation of drought tolerance indices for genotype selection of foxtail millet (Setaria italica)

2018 ◽  
Vol 2 (2) ◽  
pp. 37-40 ◽  
Author(s):  
SHERLY LAPUIMAKUNI ◽  
NURUL KHUMAIDA ◽  
SINTHO WAHYUNING ARDIE ◽  
SINTHO WAHYUNING ARDIE
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Foxtail Millet ◽  
Setaria Italica ◽  
Potential Yield ◽  
Tolerance Level ◽  
Drought Tolerant ◽  
Drought Tolerance Indices ◽  
Tolerance Indices ◽  
Selection Of

Lapuimakuni S, Khumaida N, Ardie SW. 2018. Evaluation of drought tolerance indices for genotype selection of foxtail millet (Setaria italica). Trop Drylands 2: 37-40. Foxtail millet (Setaria italica (L.) Beauv) is one of underutilized crop grown for its nutritious grain and its relative tolerance to drought stress. Although foxtail millet has been reported as to be relatively tolerant to drought stress, the drought tolerance level of this crop is varied between genotypes. Thus, breeding approaches to develop drought-tolerant foxtail millet variety is of great importance. This study aimed to: (i) evaluate several drought tolerance indices to determine one or more predictors among studied indices, and (ii) identify the drought tolerance level of the evaluated foxtail millet genotypes. Eight foxtail millet genotypes were planted in a greenhouse with a completely randomized design and five replications under both drought and normal watering conditions. Staggered planting was applied to synchronize flowering time. Water was withheld for 15 days during the flowering period, and then plants were re-watered until harvest time. Multiple indices for drought tolerance were calculated based on the potential yield (Yp) under non-stress and yield (Ys) under stress conditions. Based on the correlation, principal component analysis, and cluster analysis, yield index (YI) and harmonic mean (HM) were considered the best indices for the selection of drought-tolerant foxtail millet genotypes. By using the best indices, two foxtail millet genotypes (ICERI-5 and ICERI-6) were considered as drought tolerant genotypes.

scholarly journals Evaluation of drought tolerance indices for selection of high yielding drought tolerant rice genotypes in Lamjung, Nepal

2020 ◽  
Vol 7 (2) ◽  
pp. 54-59
Author(s):  
Kamana Bhandari ◽  
Laxmi Prasad Joshi ◽  
Nikita Bhandari ◽  
Koshraj Upadhyay ◽  
Subarna Sharma
Keyword(s):  
Drought Tolerance ◽  
Drought Tolerant ◽  
Rice Genotypes ◽  
Drought Tolerance Indices ◽  
Tolerance Indices ◽  
Selection Of
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