Wheat Variety Improvement for Climate Resilience

Puri, Ramesh Raj; Tripathi, Santosh Raj; Bhattarai, Rudra; Dangi, Sangharash Raj; Pandey, Deepak

doi:10.9734/ajraf/2020/v6i230101

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…2), indicating genotype selection based on the tested tolerance indices can be an effective tool for identifying droughttolerant wheat genotypes. Many researchers have also reported similar results while testing the same tolerance indices singly or in a group (Singh et al, 2011;Bennani et al, 2017;Kamrani et al, 2017;Puri et al, 2020).…”

Section: Discussionmentioning

confidence: 58%

Screening drought-tolerant bread wheat genotypes using yield-based stress indices

Ahmed,

Nazran,

Ghosh

et al. 2023

Ann. Bangladesh Agric.

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Global wheat (Triticum aestivum L.) productivity suffers severely from drought stress. Exploiting natural variation in drought tolerance among genotypes offers a promising avenue to counter yield losses and breed superior varieties. As yield is the key trait in wheat breeding, selecting genotypes based on both yield and drought tolerance indices remain a viable strategy. To identify tolerant genotypes using yield and yield-based indices, a comprehensive investigation was conducted in a factorial fashion of 56 wheat genotypes under two water regimes (control and drought) over two distinct growing years. This approach employed a split-plot design to ensure the statistical robustness of the results. Drought stress significantly reduced grain yield regardless of genotype or growing season. Strong correlations were observed between yields and yield-based drought tolerance indices, with most associations being strongly positive for both control and drought-stressed conditions. Both hierarchical cluster analysis and principal component analysis produced well-correlated results, revealing three distinct genotypic clusters: 6 tolerant and high-yield, 31 mid-tolerant, and 19 susceptible and low-yield genotypes. Statistical analysis showed that eight drought tolerance indices, viz. stress tolerance index (STI), modified stress tolerance index (mSTI), mean productivity (MP), geometric mean productivity (GMP), harmonic mean index (HMI), relative efficiency index (REI), relative decrease in yield (RDY), and superiority index (Pi) effectively distinguished the genotypic clusters, indicating their usefulness in selecting drought-tolerant and high-yielding wheat genotypes. The genotypes from the tolerant cluster: BARI Gom 33, BARI Gom 21, BAW-1147, BD-9910, BD-600, and BD-9889 exhibited better yield protection under drought stress compared to the other genotypes, demonstrating their potential for cultivation in water-deficit environments. Ann. Bangladesh Agric. (2023) 27 (2): 41-58

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Section: Discussionmentioning

confidence: 58%

Screening drought-tolerant bread wheat genotypes using yield-based stress indices

Ahmed,

Nazran,

Ghosh

et al. 2023

Ann. Bangladesh Agric.

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“…While genotypes with a high value of PC2 and a low value of PC1 are low-yielding genotypes under stress conditions i.e., SVIN-312, IR-192077-21-21-3-B, and IR10L192 which had relatively low performance under both conditions. Kamrani et al (2018) and Puri et al (2020) reported similar results while evaluating durum wheat and spring wheat genotypes for heat stress tolerance, respectively. A positive and significant correlation between STI, GMP, and MP with Yp and Ys has also been previously reported by other researchers (Abdolshahi et al, 2013;Carvalho et al, 2022;Hussain et al, 2021;Pavithra and Vengadessan, 2020;Garg and Bhattacharya, 2017;Ullah and Shakeel, 2019), which further supports our findings.…”

Section: Correlation and Principal Component Analysismentioning

confidence: 66%

Yield Performance Evaluation of Thirty Spring Rice (Oryza sativa L.) Cultivars Under Terminal Drought Conditions Using Various Drought-Tolerant Indices

Rai,

Thapa,

Rawal

et al. 2023

AgroEnviron. Sustain.

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An experiment was conducted from February 19, 2022, to July 4, 2022, in the farmer's field of Itahari Sub-metropolitan city in Nepal under well water and drought conditions to screen thirty drought-tolerant spring rice (Oryza sativa L.) genotypes using various drought tolerant indices for its cultivation under rainfed and drought areas. Analysis of variance revealed that grain yield under both conditions were significantly different and yield under well-watered condition was higher than yield under drought condition. The greater value of tolerance index (TOL) was reported in Chaite-2 and IR-80991-B330-0-2 and the minimum value of TOL was reported in IRE16L1661 and IR16L1004. The lowest value of stress susceptibility index (SSI) was reported in IRE16L1661, the maximum value of yield susceptibility index (YSI) was reported in IRE16L1661, and the maximum values of mean productivity index (MP), geometrical mean productivity (GMP), and stress tolerance index (STI) were reported in IRE 1621661. Correlation analysis revealed that the high-yielding genotype under well-watered conditions also yielded higher under-stress conditions. For grain yield, analysis of variance and principal component analysis revealed that IRE 1621661 is suitable for both conditions and genotype IRE16L1661 is stable under drought conditions based on drought tolerance indices. Thus, these two genotypes can be recommended under drought stress in the inner plains of Nepal with appropriate agronomic practices.

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“…Stress tolerance indices were calculated based on yield under late sown and drought under late sown condition. STIs had been used to identify stress-tolerant genotypes of wheat (Puri et al, 2020;Sharma et al, 2013;Singh et al, 2011). TOL, MP, GMP, YSI, STI, MSTI1, MSTI2, and SSI were www.cornous.com used to evaluate the stress tolerance of tested genotypes (Bennani et al, 2017;P.…”

Section: Yield Performancementioning

confidence: 99%

Evaluation of wheat genotypes using stress tolerance indices under irrigated and drought at late sown condition

Nyaupane

2023

JINAGRI

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Late sowing and drought under late sown conditions of wheat are the major constraints on wheat production in South Asian countries. The yield of wheat is significantly reduced due to the lack of irrigation water and temperature-induced late sown in Nepal. To identify late sown drought tolerant genotypes of wheat a field experiment was conducted using twenty elite wheat genotypes at the Institute of Agriculture and Animal Science (IAAS), Paklihawa Campus, Nepal in an alpha lattice design with two replication using ten stress tolerance indices (STIs) (Tolerance Index (TOL), Mean Productivity (MP), Stress Susceptibility Index (SSI), Geometric Mean Productivity (GMP), Stress Tolerance Index (STI), Yield Stability Index (YSI), Modified Stress Tolerance Index 1 (MSTI 1), and Modified Stress Tolerance Index 2 (MSTI 2)). NL 1368 and Bhirkuti was found to have highest yield under late sown and drought under late sown condition. The grain yield was found to be reduced from 10.7% to 43.1 % under late sown drought conditions with a mean reduction of 23.67% in comparison with late sown condition showing a direct effect of drought under late sown condition on grain yield of wheat. Correlation analysis showed, yield at late sown condition and yield at drought under late sown condition were significantly positively correlated to MP, GMP, STI, MSTI1, and MSTI2. Principal component biplot analysis showed, Yp and Ys both were positively correlated with MP, GMP, MSTI1, and MSTI2. Hence, selection based on MP, GMP, MSTI1, and MSTI2 would give a highyielding genotype under both conditions. The first two principal 38 www.cornous.comcomponents cumulatively explains 98.720% of total variation for stress tolerance indices and Bhirkuti, BL 4919, NL 1368, and NL 1376 were found to be high yielding potential genotypes across both environments. Thus, these can be used as a genetic material for yield improvement in wheat.

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Wheat Variety Improvement for Climate Resilience

Cited by 7 publications

References 8 publications

Screening drought-tolerant bread wheat genotypes using yield-based stress indices

Screening drought-tolerant bread wheat genotypes using yield-based stress indices

Yield Performance Evaluation of Thirty Spring Rice (Oryza sativa L.) Cultivars Under Terminal Drought Conditions Using Various Drought-Tolerant Indices

Evaluation of wheat genotypes using stress tolerance indices under irrigated and drought at late sown condition

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