Screening drought tolerance criteria in maize

2002 ◽  
Vol 50 (4) ◽  
pp. 411-416 ◽  
Author(s):  
E. Farshadfar ◽  
J. Sutka
Keyword(s):  
Stress Tolerance ◽  
Block Design ◽  
Geometric Mean ◽  
Selection Criterion ◽  
Yield Potential ◽  
Tolerance Index ◽  
Correction Coefficient ◽  
Drought Tolerant ◽  
Rainfed Conditions ◽  
Pure Lines

Six pure lines of maize were tested in a randomized complete block design with three replications under irrigated and rainfed conditions. Genetic variation was found between the genotypes for yield potential (Yp), stress yield (Ys), tolerance index (TOL), geometric mean productivity (GMP), harmonic mean (HM) and stress tolerance index (STI). Stress tolerance index was corrected using a correction coefficient (ki) and thus a modified stress tolerance index (MSTI) was introduced as the optimal selection criterion for drought-tolerant genotypes. The results of three-D plotting indicated that the most desirable genotype for irrigated and rainfed conditions was the genotype K1515, for non-stressed conditions K18 and for stress conditions K104/3, K760/7 and K126/10.

scholarly journals EVALUATION OF DROUGHT TOLERANCE IN NEW COTTON CULTIVARS USING STRESS TOLERANCE INDICES

AGROFOR ◽  
2018 ◽  
Vol 3 (1) ◽  
Author(s):  
Minka KOLEVA ◽  
Valentina DIMITROVA
Keyword(s):  
Stress Tolerance ◽  
Block Design ◽  
Geometric Mean ◽  
Moisture Stress ◽  
Yield Potential ◽  
Tolerance Index ◽  
Effective Selection ◽  
Stress Environment ◽  
Stress Susceptibility ◽  
Tolerance Indices

Drought is a wide-spread problem seriously influencing production and quality ofcotton (Gossypium hirsutum L.), but development of resistant cultivars is hamperedby the lack of effective selection criteria. The objective of this study was toevaluate the ability of several selection indices to identify drought tolerant cultivarsunder different environmental conditions. Thirteen cotton cultivars were evaluatedunder both moisture stress (2016) and non-stress (2013) field environments using arandomized complete block design for each environment. Six drought toleranceindices including stress susceptibility index (SSI), stress tolerance index (STI),tolerance index (TOL), mean productivity (MP), geometric mean productivity(GMP) and mean harmonic productivity (HMP) were used. The significant andpositive correlation of yield of genotype under non-stress condition (Yp) and MP,GMP and STI showed that these indices were more effective in identifying highyielding cultivars under different moisture conditions. The results of calculatedgain from indirect selection in moisture stress environment would improve yieldbetter than selection from non moisture stress environment. Coton breeders should,therefore, take into account the stress severity of the environment in choosing anindex. The varieties Viki and Avangard-264 had the highest yields under non-stressconditions. Vega and Chirpan-539 varieties had a low yield potential and showed ahigh stress tolerance to drought.

scholarly journals Identifying drought tolerant wheat varieties using different indices

2015 ◽  
Vol 13 (1) ◽  
pp. 148-161 ◽  
Author(s):  
RP Meena ◽  
SC Tripathi ◽  
S Chander ◽  
RS Chookar ◽  
Msamrutha A Verma ◽  
...  
Keyword(s):  
Stress Tolerance ◽  
Geometric Mean ◽  
Central Zone ◽  
Moisture Stress ◽  
Yield Potential ◽  
Tolerance Index ◽  
Wheat Varieties ◽  
Wheat Genotypes ◽  
Water Stress Tolerance ◽  
Drought Tolerant

Moisture stress is a major constraint in productivity across the wheat growing zones of India. Climate change and uneven rainfall further aggravate the situation under moisture stress environments. Wheat genotypes capable of giving increased yield under a broad range of optimal and sub-optimal water availability are considered desirable. This study was undertaken to evaluate various selection indices of moisture stress and their applicability in identifying drought tolerant wheat genotypes which can adapt to various moisture stressed environments in different wheat growing zones of India i.e., North Western Plain Zone, North Eastern Plain Zone, Central Zone and Peninsular Zone. A set of wheat genotypes were tested under moisture stress condition of different irrigation regimes. Irrigation treatments were arranged as main plots and varieties as sub plots. Fifteen wheat varieties representing major wheat growing zones of India were tested for water stress tolerance during two consecutive years. It was found that yield under irrigated conditions (Ypi), yield under stress conditions (Ysi) and lower stress tolerance index (STI), were marked indices for stress tolerance. Significantly positive correlation of Ypi and Ysi with STI, mean productivity (MP), geometric mean productivity (GMP) were obtained during both the years of the study. The indices of STI, MP and GMP could be used as the desirable indices for screening drought tolerant varieties. On the basis of findings of these indices wheat varieties NI-5439, WH-1021 and HD-2733 were found having higher stress tolerance and with better yield potential under both normal and restricted irrigation conditions of India.SAARC J. Agri., 13(1): 148-161 (2015)

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.

scholarly journals Drought Resistance Indices for Screening of Potato (Solanum tuberosum L.) Genotypes

2019 ◽  
Vol 7 (8) ◽  
pp. 1118
Author(s):  
Zerihun Kebede Beyene ◽  
Firew Mekbib ◽  
Tesfaye Abebe ◽  
Asrat Asfaw
Keyword(s):  
Stress Tolerance ◽  
Solanum Tuberosum L ◽  
Geometric Mean ◽  
Strong Association ◽  
Principal Component ◽  
Screening Tools ◽  
Tolerance Index ◽  
Lattice Design ◽  
Terminal Drought ◽  
Drought Tolerant

In breeding for drought tolerance, availability of precise, cheap and easy to apply selection tool is critical. The aim of the present study was to identify potential screening tools that are useful for selection of drought tolerant genotypes in potato and select drought resistant potato genotypes. The study assessed sixty clones arranged in a 10×6 alpha lattice design with two replicates in a managed stress experiment. Two irrigation treatments were applied: fully watered non-stress and terminal drought, where the irrigation water supply to the crop was withheld after 50 % flowering to induce post-flowering stress. Stress indices were calculated based on tuber yield of genotypes in both stressed and non-stressed conditions. Identification of drought tolerant genotypes based on a single index was less informative as different indices identified different genotypes as drought tolerant. Hence, to determine the most desirable drought tolerant clones rank sum of indices, correlation, and bi-plot display of the principal component analysis was employed. The indices modified stress tolerance index based on non-stressed yield, Men productivity, Geometric mean productivity, Stress tolerance index, Harmonic mean, modified stress tolerance index based on stressed yield and Yield index exhibited strong association with both yield under stressed and non-stressed yield. These indices discriminated drought tolerant genotypes with higher tuber yielding potential both under stress and non-stress conditions. Genotypes CIP-398180.612, CIP-397069.5, and CIP-304371.67 were identified as drought tolerant. These genotypes could be potentially grown both under drought prone and potential environments and these selection attributes could help to develop climate resilient potato varieties.

scholarly journals STRESS TOLERANCE INDEX- A NEW INDICATOR OF TOLERANCE

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 626d-626 ◽  
Author(s):  
George C.J. Fernandez
Keyword(s):  
Stress Intensity ◽  
Stress Tolerance ◽  
Selection Criteria ◽  
High Stress ◽  
Selection Criterion ◽  
Yield Potential ◽  
High Yield ◽  
Tolerance Index ◽  
Potential Yield ◽  
Yield Data

Selection criteria for identifying genotypes with high stress tolerance and high yielding potentials were compared using a moderately stressed, (Stress intensity, [1-(mean stress yield (Yp̄)/mean potential yield (Ys̄)] 0.73) and a severely stressed (Stress intensity, 0.24) mungbean yield data sets. Selection based on tolerance (T), difference between potential yield (Yp) and the yield in stress environment (Ys) favored genotypes with tolerance and low yield potentials. Selection based on the mean productivity (MP), [MP=(Yp+Ys)/2] favored the genotypes with high yielding potential. The Stress Susceptibility Index (S), (S = [(Yp-Ys)/Yp]/[(Yp̄-Ys̄)/Yp̄], also favored the low yielding and stress tolerant genotypes. These selection criteria failed to identify genotypes with high yielding and stress tolerance potentials. Thus, a selection criterion, Stress Tolerance Index (STI) is proposed here which identifies genotypes with high yield and stress tolerance potentials. The STI takes into account both stress tolerance and yield potentials. The STI is estimated as: [Yp/Yp̄][1-(T/Yp̄)]. The higher the value of STI for a genotype in a given stressed environment, the higher was its stress tolerance and yield potential. The interrelationships between these stress tolerance criteria are discussed by a biplot display.

scholarly journals Evaluation and comparison of drought tolerance in some wild diploid populations, tetraploid and hexaploid cultivars of wheat using stress tolerance indices

2020 ◽  
Vol 115 (1) ◽  
pp. 105
Author(s):  
Sara KHOSRAVI ◽  
Reza AZIZINEZHAD ◽  
Amin BAGHIZADEH ◽  
Mahmood MALEKI
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Grain Yield ◽  
Stress Tolerance ◽  
Block Design ◽  
Geometric Mean ◽  
Tolerance Index ◽  
Wheat Genotypes ◽  
Drought Tolerance Indices ◽  
Tolerance Indices

<p>This study was carried out on grain yield in wheat genotypes with the aim of assessing genetic potential of drought tolerance. The experiment was performed as split plot in the form of randomized complete block design with three replications under normal and drought stress conditions with 32 genotypes. Based on grain yield, and under the condition of non-stress and drought stress, 5 drought tolerance indices are estimated including Tolerance Index (TOL), Stress Tolerance (STI), Mean Productivity (MP), Geometric Mean (GMP) and, Harmonic Mean (HM) for all kinds of genotypes. The analysis of yield correlation and drought tolerance indices in two environments indicated that STI, MP, GMP, HM indices were the most suitable parameters for screening wheat genotypes. Principal components analysis exhibited that the 83 % of first principal component and the 15 % of second one justified the variation of the initial data. Drawing bi-plot diagram declared that Sabalan, Shabrang, Aria, Azar, Azadi, and T2 genotypes were highly functional and resistant to drought stress.</p>

scholarly journals Potensi Hasil dan Toleransi Galur-galur Inbrida Sorgum pada Tanah dengan Hara Fosfor Rendah

2019 ◽  
Vol 47 (1) ◽  
pp. 39-46 ◽  
Author(s):  
Jorex Daniel Momongan ◽  
Trikoesoemaningtyas Trikoesoemaningtyas ◽  
Desta Wirnas ◽  
Dan Didy Sopandie
Keyword(s):  
Stress Tolerance ◽  
Acid Soil ◽  
Block Design ◽  
Plant Genetic Resources ◽  
Inbred Lines ◽  
Growth And Yield ◽  
Yield Potential ◽  
Tolerance Index ◽  
P Availability ◽  
P Deficiency

Sorghum development in Indonesia is directed towards cultivation in dryland and acid soil with low P availability. This research was aimed to obtain information on the performance of sorghum traits for selection in P deficient environment at early vegetative phase (3 weeks after planting), agronomic and yield potential traits in both P sufficient and P deficient environments, also to select high productivity sorghum genotypes which could tolerate P deficiency. The genetic materials used were 19 F7 recombinant inbred lines from a cross of B69 x Numbu developed under optimum condition (indirect breeding) by single seed decent. Variety Numbu and B69 used as checks. This research was conducted at The Indonesian Center for Biotechnology and Agriculture Plant Genetic Resources experimental field, Bogor, from May to September 2017. The experiment used a randomized complete block design with 3 replicates. The results showed that agronomic and yield traits varied among inbred lines under low P condition and optimum P condition. Adaptive lines showed better growth and yield compared to sensitive ones under low P condition. Plant height, panicle weight, and grain weight per panicle had high estimates of broad sense heritability. Selection based on stress tolerance index was able to identify inbred lines 286-6, 115-9, 114-7, 331-8, 170-9, 151-8, 104-7, 413-7, 68-5, 315-6, and 341-7 as tolerant to low P condition.Keywords: heritability, indirect breeding, optimum P condition, stress tolerance index

scholarly journals Evaluation of Some Sugar Beet Genotypes Under Drought Stress Based on Selection Indices

2018 ◽  
Vol 1 (1) ◽  
pp. 34-48 ◽  
Author(s):  
Salah A. Okasha ◽  
Mohamed H. Mubarak
Keyword(s):  
Water Stress ◽  
Drought Stress ◽  
Sugar Beet ◽  
Stress Tolerance ◽  
Drought Index ◽  
Block Design ◽  
Geometric Mean ◽  
P Value ◽  
Tolerance Index ◽  
Sensitivity Index

This study was conducted to determine drought tolerant indices of some sugar beet genotypes under water stress and non-stress conditions. Nine sugar beet (Beta Vulgaris L.) genotypes were tested in a Split-plot experiment based on a randomized complete block design in three replications under three levels of water stress 100%, 75% and 50% from plant requirements at the experimental farm Faculty of Agriculture, Suez Canal University, Ismailia, Egypt during 2015/ 2016 and 2016 / 2017 seasons. Twelve drought tolerance indices were used in this study, stress sensitivity index (SSI), stress tolerance (TOL), mean productivity (MP), geometric mean (GMP), harmonic mean (HM),yield stability index (YSI), yield index (YI), stress tolerance index (STI), sensitivity drought index (SDI), relative drought index (RDI), drought response index (DI) and stress susceptibility percentage index (SSPI). GMP, MP and STI were more informative towards classification of better or superior genotypes with respect to tolerant and sensitive groups. The results showed that the genotypes with high STI, GMP and MP values were suitable for cultivation under drought stress and non-stress environments. Both Yp and Ys of root yield in the control-50% analysis had significantly positive correlated (P value<0.05) with MP, GMP, YI, HM and DI, This indicates that these indices were more effective in identifying high yielding genotypes under drought stress as well as non-stress conditions.Principal components analysis showed that the first two components in the control-50% analysis, genotype Bts 1237 and Temar were identified as the most stable high yielding genotypes in both environments

scholarly journals Identification of salt tolerant genotypes in wheat using stress tolerance indices

2021 ◽  
Author(s):  
Behnam Bakhshi ◽  
Seyed Mohammad Taghi Tabatabaei ◽  
Mohammad Reza Naroui Rad ◽  
Bahram Masoudi
Keyword(s):  
Stress Tolerance ◽  
Salinity Stress ◽  
Agricultural Land ◽  
Block Design ◽  
Geometric Mean ◽  
Yield Stability ◽  
Stress Conditions ◽  
High Yield ◽  
Tolerance Index ◽  
Wide Range

AbstractSalinity is one of the most important causes of yield loss in agricultural products, especially wheat. Wheat cultivation, on the other hand, is carried out on a wide range of agricultural land in saline lands. Therefore, wheat breeding for tolerance to salinity can be an effective way to improve yield and yield stability under these conditions. In this study, twenty wheat genotypes were studied in a randomized complete block design with three replications in two normal and salinity stress conditions in order to identify suitable indices of wheat stress tolerance and also to identify genotypes tolerant to salinity stress. Genotypes were evaluated based on tolerance index (TOL), stress tolerance index (STI), mean productivity (MP), susceptibility to stress (SSI), geometric mean productivity (GMP), harmonic mean productivity (HM), yield stability (YS) and yield index (YS). The results showed that MP, GMP, HM and STI indices are suitable indices because of their positive and highly significant correlation with yield in both normal and salinity stress conditions and it was found that these indices were suitable tools to achieve high yield genotypes in both environments. The results also showed that genotypes 10, 4, 9, 3 and 8 are resistant to salt stress with acceptable yield. Genotypes 5, 11, 12, 14, 16, 17, 18 and 20 were also identified as the most susceptible genotypes.

scholarly journals Evaluation of drought tolerance in corn (Zea mays L.) new hybrids with using stress tolerance indices

2012 ◽  
Vol 1 (3) ◽  
pp. 543 ◽  
Author(s):  
H. Moradi ◽  
G A. Akbari ◽  
S. Khavari Khorasani ◽  
H A. Ramshini
Keyword(s):  
Drought Stress ◽  
Drought Tolerance ◽  
Stress Tolerance ◽  
Block Design ◽  
Geometric Mean ◽  
Weather Condition ◽  
Tolerance Index ◽  
Drought Tolerance Indices ◽  
Stress Susceptibility ◽  
Tolerance Indices

In order to study the effect of drought stress on morphophysiologic characteristics,yield and yield components of 8 new hybrids of corn (Zea maize L.) and KSC704commercial hybrid as control resistant to drought and warm (which were bred andscreened in Khozestan province condition), an experiment was conducted in aRandomized Complete Block Design (RCBD) with three replications underdrought stress and normal irrigation at Khorasan-Razavi Agriculture ResearchCenter, Mashhad, Iran on June 10, 2011. The results of analyze variance showedthat under normal irrigation and drought condition, there was a significantdifference (p<0.01) between the hybrids. Mean comparison of hybrids revealedthat in normal irrigation H6 and in drought stress H8 hybrid had the maximumgrain yield (12.85 and 6.75 ton/ha, respectively). Based on the grain yields ofstudied hybrids, stress tolerance index (STI), stress susceptibility index (SSI),tolerance index (TOI), mean productivity (MP), geometric mean productivity(GMP), harmonic mean (HM) and golden mean (GM) were estimated. Resultsshowed that among drought tolerance indices, MP, GMP, STI and HM were thebest indices for corn and KSC704 hybrid and H4 had the highest tolerance todrought in Mashhad weather condition.

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