Genetic variation in wheat germplasm for salinity tolerance atseedling stage: improved statistical inference

Hussain, Babar; Khan, Abdus Salam; Ali, Zulfiqar

doi:10.3906/tar-1404-114

Cited by 25 publications

(28 citation statements)

References 19 publications

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“…The variance due to salinity concentrations had the main portion of the total variance compared with cultivars and cultivars × salinity concentrations interaction variance. These results are in agreement with those obtained by El-Hendawey (2011) and Hussain et al, (2015). Coefficient of variation estimates ranged from 12.3% for shoot-root dry weight ratio to 18.2% for shoot dry weight (Table 4).…”

Section: Seedling Experimentssupporting

confidence: 91%

“…While the lowest mean values were recorded for the bread wheat cultivars Misr 1 for plant height; Giza 139 for grain yield; Sids 12 for biological yield, straw yield and number of spikes per pot; Giza 144 for number of kernels per spike; Misr 2 for one hundred kernels weight. Varying bread wheat genotypes for salinity response was reported by many researchers such as El-Hendawey et al (2011), Hussain et al (2015) and Sharma (2015). The interaction between cultivars and salt treatments for the studied characters are illustrated in Table 8.…”

Section: Pots Experimentsmentioning

confidence: 77%

“…El-Hendawy et al (2011) found highly significant correlation between grain yield per plant and shoot parameters (height and dry weight of shoot) at seedling stage. Hussain et al (2015) reported that shoot parameters had comparatively stronger correlations than root parameters.…”

Section: Correlationmentioning

confidence: 99%

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Evaluation of Nine Egyptian Bread Wheat Cultivars for Salt Tolerance at Seedling and Adult-Plant Stages

Ragab

Taha

2016

Journal of Plant Production

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The present study was conducted at the Experimental Farm and the in 2014/2015 season. The objectives of this investigation were to study salinity effect on different nine bread wheat cultivars, to identify salt tolerance in several growth stages, and to identify salt tolerance screening criteria by studying the relationship between wheat yield under salt affected soil and several growth stages characters. Three experiments were conducted in 2014/2015, i.e., seedling test in the lab (open area), adult plant evaluation in pots in open area and field experiment in normal soil and salt affected soil. Salinization in seedling and pots experiments was established using five levels of Mediterranean Sea water to tap water mixtur (0, 26, 29, 31,33and 35% sea water) which established EC 0.48, 13.5, 15.0, 16.0, 17.0 and 18.0 dSm -1 , respectively. The nine cultivars Misr 1, Misr 2, Giza 139, Giza 144, Gemmeiza 9, Gemmeiza 3, Hindi 62, Sids1 and Sids 12 were used. Results indicated that increasing salt concentrations caused significant decrease in shoot dry weight, shoot length, root dry weight, root length and emergence index at seedling stage; plant height, biological yield, grain yield, straw yield, number of kernels per spike and kernel weight at adult plant stage; however, shoot root dry weight ratio at seedling stage was increased. The variances due to salt treatments had the major portion of total variance, indicated the large effect of salt stress on growth characters compared to genotypes and genotypes × salt concentration interaction's variances. The treatment 33% sea water mix (17dSm -1 ) seems to be suitable for screening the studied cultivars for salt tolerance. The large variance among the nine cultivars for shoot length, emergence index and shoot-root dry weight ratio under salt stress indicated the importance of these characters in studying the effect of salt stress at seedling stage. Strong and positive correlations were found between biological yield (under salt affected soil) and each of emergence index and shoot length at seedling stage; number of spike per pots, biological and straw yields per pot at adult-plant stage. Based on stress tolerance index, out of the nine studied cultivars, Misr 2 can be classified as salt tolerant cultivar and Gemmeiza 3 and Sids 12 as salt sensitive cultivars. Kewords: Bread wheat, Salinity stress, seedling and adult-plant salt tolerance.

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Section: Seedling Experimentssupporting

confidence: 91%

Section: Pots Experimentsmentioning

confidence: 77%

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Evaluation of Nine Egyptian Bread Wheat Cultivars for Salt Tolerance at Seedling and Adult-Plant Stages

Ragab

Taha

2016

Journal of Plant Production

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“…Most of plant breeders selected the drought and other stress tolerant wheat varieties on the basis of higher yields and ignored the physiological mechanism behind it. Therefore, few cultivars having drought and abiotic stress tolerance have been developed in comparison to the ones improved for high yield ( Hussain et al, 2015 ). Under drought, plant machinery shifts its focus to ABA production for downstream activation of signaling and tolerance mechanisms which lowers the grain filling and yield.…”

Section: Genetics Based Improvement In Drought Signalingmentioning

confidence: 99%

From Genetics to Functional Genomics: Improvement in Drought Signaling and Tolerance in Wheat

et al. 2015

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Drought being a yield limiting factor has become a major threat to international food security. It is a complex trait and drought tolerance response is carried out by various genes, transcription factors (TFs), microRNAs (miRNAs), hormones, proteins, co-factors, ions, and metabolites. This complexity has limited the development of wheat cultivars for drought tolerance by classical breeding. However, attempts have been made to fill the lost genetic diversity by crossing wheat with wild wheat relatives. In recent years, several molecular markers including single nucleotide polymorphisms (SNPs) and quantitative trait loci (QTLs) associated with genes for drought signaling pathways have been reported. Screening of large wheat collections by marker assisted selection (MAS) and transformation of wheat with different genes/TFs has improved drought signaling pathways and tolerance. Several miRNAs also provide drought tolerance to wheat by regulating various TFs/genes. Emergence of OMICS techniques including transcriptomics, proteomics, metabolomics, and ionomics has helped to identify and characterize the genes, proteins, metabolites, and ions involved in drought signaling pathways. Together, all these efforts helped in understanding the complex drought tolerance mechanism. Here, we have reviewed the advances in wide hybridization, MAS, QTL mapping, miRNAs, transgenic technique, genome editing system, and above mentioned functional genomics tools for identification and utility of signaling molecules for improvement in wheat drought tolerance.

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“…Salinity reduces root growth in many plant species, including rice ( Oryza sativa L.) (Tu et al, 2014), barley ( Hordeum vulgare L.) (Shelden et al, 2013; Shelden et al, 2016), durum wheat ( T. durum Desf.) (Rahnama et al, 2011a), and bread wheat (Hussain et al, 2015). Salinity has been shown to have differential effects on seminal root elongation rates and lateral root initiation due mainly to the osmotic effect of the salt rather than to ion‐specific effects (Munns and Cramer, 1996; Rahnama et al (2011a).…”

mentioning

confidence: 99%

Root Growth and Architecture Responses of Bread Wheat Cultivars to Salinity Stress

2019

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The screening of genotypes that perform better in saline soils is important for food security as the arable land affected by this problem is increasing. To mimic the conditions found in saline fields, a saline soil‐based screening method was developed to distinguish genetic diversity in root growth responses and shoot growth rates of bread wheat (Triticum aestivum L.) cultivars, namely Roshan, Bam, Tabbasi, Mahooti, Shiraz, Qods, Falat, and Atrak. Soil‐filled polyvinyl chloride (PVC) tubes perfused with 50 to 200 mM NaCl and a standard nutrient solution was employed. A constant salt concentration was maintained throughout the soil profile in the PVC tubes. Genetic variation in root growth and leaf Na+ concentrations was observed between cultivars in response to salinity. Salinity decreased the relative growth rate, seminal and total root length, and the distance between root tip and the first lateral root but increased total branch roots. For most traits, the growth reductions due to salinity were higher in salt‐sensitive compared with salt‐tolerant cultivars. The seminal root length was reduced more than branch root length in all cultivars. Roshan and Tabbasi were identified as the most tolerant to salinity due to their longer seminal axile roots, shorter distance from the tip, higher distal branch root numbers, and higher branch root length compared to the other cultivars. A positive relationship between genetic variations in root growth response and relative growth rate indicates that root growth might be the key factor driving shoot growth and can be used as a criterion for screening salinity tolerance. Core Ideas Genetic variation was found in root growth traits and shoot growth rate in response to soil salinity. Salinity reduced shoot growth rate, seminal and total root length, but increased branch root length. A positive relationship was found between root growth response and shoot growth rate.

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Genetic variation in wheat germplasm for salinity tolerance atseedling stage: improved statistical inference

Cited by 25 publications

References 19 publications

Evaluation of Nine Egyptian Bread Wheat Cultivars for Salt Tolerance at Seedling and Adult-Plant Stages

Evaluation of Nine Egyptian Bread Wheat Cultivars for Salt Tolerance at Seedling and Adult-Plant Stages

From Genetics to Functional Genomics: Improvement in Drought Signaling and Tolerance in Wheat

Root Growth and Architecture Responses of Bread Wheat Cultivars to Salinity Stress

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