QTL Analysis for Drought Tolerance in Wheat: Present Status and Future Possibilities

Gupta, P. K.; Balyan, H. S.; Gahlaut, Vijay

doi:10.3390/agronomy7010005

Cited by 146 publications

(129 citation statements)

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“…Quantitative trait loci associated with yield, agronomic traits and physiological traits in drought and heat stress environment underlie important genomic regions that can be considered for improvement under stress (Gupta et al., ). Earlier studies had also identified similar genomic regions for NDVI and yield contributing traits on chromosome 2A and 4B (Gao et al., ; Pinto et al., ).…”

Section: Discussionmentioning

confidence: 99%

“…Identification of QTLs linked to various physiological traits affecting the expression of yield had been documented for improvement of crops for stress tolerance and yield stability (Reynolds & Tuberosa, 2008). There are numerous reports on molecular markers linked with expression of QTLs at a phenotypic level for drought tolerance (Gupta et al, 2012(Gupta et al, , 2017Pinto et al, 2010), but their deployment in wheat-breeding programmes is still rare. Examples of successful use of MABB in cereals including barley, rice and maize for biotic and abiotic stress tolerance are available, but most of wheat-breeding projects in countries like Canada, USA, Australia, India and CIMMYT, Mexico are focussed on simple traits like pest resistance, disease resistance and quality traits (Gupta, Kaur, Sehgal, Sharma, & Chhuneja, 2010).…”

Section: Discussionmentioning

confidence: 99%

“…Although a number of QTLs have been reported for yield and physiological traits that contribute to improved adaptation under drought stress (Gupta, Balyan, & Gahlaut, 2017;Gupta, Balyan, Gahlaut, & Kulwal, 2012;Pinto et al, 2010), few have been validated and fewer are practically utilized in wheat-breeding programmes. Meta-analysis of QTLs linked to adaptation with drought stress has also been conducted, and 66 major meta-QTL regions were mapped on all 21 chromosomes (Acuña-Galindo, Mason, Subramanian, & Hays, 2015).…”

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Marker‐assisted backcross breeding for improvement of drought tolerance in bread wheat (Triticum aestivum L. em Thell)

et al. 2018

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Drought stress is presently a major productivity limiting factor in wheat. This study developed five wheat lines with inbuilt tolerance to drought stress using marker‐assisted backcross breeding (MABB) approach employing three linked quantitative trait loci (QTLs) in an initial population of 516 BC1F1 plants. The high‐yielding wheat cultivar ‘HD2733’ grown over last few years extensively in the eastern plains of India is largely sensitive to drought and is used as the recurrent parent. ‘HI1500’ released for water‐limiting conditions and carrying drought‐tolerant QTLs was used as donor parent. MABB lines were advanced using foreground and background selection, coupled with stringent phenotyping. We identified 29 lines that were homozygous for targeted QTLs in different combinations with background recovery range of 89.2%–95.4%. Further evaluation of selected lines for physiological traits and distinctness, uniformity and stability (DUS) characters under rainfed condition identified five potential varieties for national varietal evaluation programme in the zone. The report is first of its kind in implementing known QTLs for the development of drought‐tolerant wheat lines through MABB approach.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

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Marker‐assisted backcross breeding for improvement of drought tolerance in bread wheat (Triticum aestivum L. em Thell)

et al. 2018

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“…Multiple QTL have been identified in all wheat chromosomes and results have been summarized in a meta-QTL analysis for drought and heat stress (Acuña-Galindo et al 2015) and in a recent review (Gupta et al 2017). …”

Section: Introductionmentioning

confidence: 99%

Identification and validation of QTL for grain yield and plant water status under contrasting water treatments in fall-sown spring wheats

et al. 2018

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Key message Chromosome regions affecting grain yield, grain yield components and plant water status were identified and validated in fall-sown spring wheats grown under full and limited irrigation. AbstractIncreases in wheat production are required to feed a growing human population. To understand the genetic basis of grain yield in fall-sown spring wheats, we performed a genome-wide association study (GWAS) including 262 photoperiod-insensitive spring wheat accessions grown under full and limited irrigation treatments. Analysis of molecular variance showed that 4.1% of the total variation in the panel was partitioned among accessions originally developed under fall-sowing or spring-sowing conditions, 11.7% among breeding programs within sowing times and 84.2% among accessions within breeding programs. We first identified QTL for grain yield, yield components and plant water status that were significant in at least three environments in the GWAS, and then selected those that were also significant in at least two environments in a panel of eight biparental mapping populations. We identified and validated 14 QTL for grain yield, 15 for number of spikelets per spike, one for kernel number per spike, 11 for kernel weight and 9 for water status, which were not associated with differences in plant height or heading date. We detected significant correlations among traits and colocated QTL that were consistent with those correlations. Among those, grain yield and plant water status were negatively correlated in all environments, and six QTL for these traits were colocated or tightly linked (< 1 cM). QTL identified and validated in this study provide useful information for the improvement of fall-sown spring wheats under full and limited irrigation.Electronic supplementary materialThe online version of this article (10.1007/s00122-018-3111-9) contains supplementary material, which is available to authorized users.

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“…In recent years, the growth and development of wheat has been seriously influenced by drought stress, which is the significant reason restricting sustainable increase of wheat yield [20]. At present, studies on wheat response to drought stress are basically limited to phenotype, structure, physiology and biochemistry, stress-resistant genes and other studies [21], epigenetic regulation of wheat response to drought stress is rarely involved, especially the regulatory role of DNA methylation in DREB transcription factor response to drought stress. In this study, main members of DREB family in wheat were identified, the expression and promoter methylation of DREB gene were analyzed under drought stress, which would be helpful to reveal the regulatory mechanism of DNA methylation in plant response to drought stress.…”

Section: Introductionmentioning

confidence: 99%

Response of DREB transcription factor to drought stress based on DNA methylation in wheat

Zhu

Jia

Wei

et al. 2020

Preprint

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Background: The growth and development of wheat are seriously influenced by drought stress, and the research on drought resistance mechanism of wheat is very important. Dehydration responsive element binding protein (DREB) plays an important role in plant response to drought stress, but epigenetic regulation for gene expression of DREB transcription factor is less studied, especially the regulatory role of DNA methylation has not been reported.Results: In this research, DREB2, DREB6 and Wdreb2 were cloned from wheat in this study, their CDS sequence was composed of 732bp, 837bp or 1035bp, respectively, one 712bp intron was found in DREB6. Although AP2/EREBP domain of DREB2, DREB6 and Wdreb2 had 73.25% identity, they belong to different types of DREB transcription factor, and the expression of Wdreb2 was significantly higher, yet was the lowest in DREB2. Under drought stress, the expression of DREB2, DREB6 and Wdreb2 could be induced, but had different trends along with the increase of stress time, and their expression had tissue specificity, was obviously higher in leaf. Promoter of DREB2, DREB6 and Wdreb2 in leaf was further studied, some elements related to adverse stress were found, and the promoter of DREB2 and Wdreb2 was slightly methylated, but DREB6 promoter was mildly methylated. Compared with the control, the level of promoter methylation decreased in DREB2 and DREB6 as stressed for 2h, then increased along with the increase of stress time, which was opposite in Wdreb2 promoter, the status of promoter methylation also had significant change under drought stress. Further analysis showed that promoter methylation of DREB6 or Wdreb2 was negatively correlated with their expression, especially was significant in Wdreb2. Conclusions: DREB2, DREB6 and Wdreb2 might function differently in response to drought stress, and promoter methylation had more significant effects on gene expression of Wdreb2 and DREB6.

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QTL Analysis for Drought Tolerance in Wheat: Present Status and Future Possibilities

Cited by 146 publications

References 111 publications

Marker‐assisted backcross breeding for improvement of drought tolerance in bread wheat (Triticum aestivum L. em Thell)

Marker‐assisted backcross breeding for improvement of drought tolerance in bread wheat (Triticum aestivum L. em Thell)

Identification and validation of QTL for grain yield and plant water status under contrasting water treatments in fall-sown spring wheats

Response of DREB transcription factor to drought stress based on DNA methylation in wheat

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