QTL mapping for salt tolerance based on snp markers at the seedling stage in maize (Zea mays L.)

Cui, Dezhou; Wu, Dandan; Somarathna, Yamuna; Xu, Chunyan; Li, Song; Zhang, Hua; Chen, Huabang; Zhao, Li

doi:10.1007/s10681-014-1250-x

Cited by 46 publications

(45 citation statements)

References 46 publications

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“…Recently, a number of QTLs regulating maize salt stress responses were reported by two different studies (Hoque ; Cui et al ). Based on the B73 reference genome, we analyzed the co‐localization of the significant loci/genes identified in our study and the QTLs identified by other researchers.…”

Section: Resultsmentioning

confidence: 99%

“…One gene, GRMZM2G445905, was co‐localized with qRRDWSDW1s on chromosome 1; three genes, GRMZM2G001334, GRMZM2G106056 and GRMZM2G001289, were co‐localized with qRL2s on chromosome 2 and GRMZM2G153454 was co‐localized with QSkc7 on chromosome 7 (Figure A, B). In total, 5 out of 49 genes co‐localized with QTLs identified by linkage mapping (Hoque ; Cui et al ). Considering that there was much more genetic diversity in our association populations than the ones used for linkage mapping by other groups, the 10% co‐localization ratio (5/49) is high.…”

Section: Resultsmentioning

confidence: 99%

“…Although the genetic materials used in our study were different from those used by other researchers for QTL mapping, we identified five loci/genes that co‐localized with previously‐identified QTLs (Hoque ; Cui et al ). Considering the large genetic differences between the association populations used in our study and the mapping populations used in other studies, the fact that 10% (5/49) of the genes we identified co‐localized with QTLs is quite impressive, indicating that the candidate genes we identified are likely to play significant roles in maize salt tolerance.…”

Section: Discussionmentioning

confidence: 99%

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Genome‐wide association study dissects the genetic bases of salt tolerance in maize seedlings

Luo

Wang

Gao

et al. 2019

JIPB

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Excess salinity is a natural stress that causes crop yield losses worldwide. The genetic bases of maize salt tolerance remain largely unknown. Here we investigated the survival rates of 445 maize natural accessions after salt treatments. A skewed distribution of the salt‐tolerant phenotypes was observed in this population. Genome‐wide association studies (GWAS) revealed 57 loci significantly associated with salt tolerance. Forty‐nine candidate genes were detected from these loci. About 10% of these genes were co‐localized with loci from QTL mapping. Forty four percent of the candidate genes were involved in stress responses, ABA signaling, stomata division, DNA binding/transcription regulation and auxin signaling, suggesting that they are key genetic mechanisms of maize salt tolerance. Transgenic studies showed that two genes, the salt‐tolerance‐associated‐gene 4 (SAG4, GRMZM2G077295) and SAG6 (GRMZM2G106056), which encode a protein transport protein and the double‐strand break repair protein MRE11, respectively, had positive roles in plant salt tolerance, and their salt‐tolerant haplotypes were revealed. The genes we identified in this study provide a list of candidate targets for further study of maize salt tolerance, and of genetic markers and materials that may be used for breeding salt‐tolerance in maize.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Genome‐wide association study dissects the genetic bases of salt tolerance in maize seedlings

Luo

Wang

Gao

et al. 2019

JIPB

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“…Assessments of genetic diversity have been performed for various crop germplasm collections, such as maize (Whitt et al ., ; Liu et al ., ; Patto et al ., ; Laborda et al ., ; Warburton et al ., ; Prasanna, ; Zheng et al ., ; Kuhn et al ., ), wheat (Laido et al ., ; Nielsen et al ., ), rice (Cho et al ., ; Temnykh et al ., ; McCouch et al ., ; Garris et al ., ; Xu et al ., ; Thomson et al ., ), barley (Struss and Plieske, ; Parzies et al ., ; Fernandez et al ., ; Moragues et al ., ) and tomato (Albrecht et al ., ; Bauchet and Causse, ; Aflitos et al ., ; Pailles et al ., ). Furthermore, various studies using forward genetics approaches have already demonstrated the value of utilising diverse germplasm in practice by detecting loci associated with various measures of salt tolerance in established crops, for example in maize, rice, wheat, barley, soybean, rapeseed and alfalfa (Cui et al ., ; Al‐Tamimi et al ., ; Liu and Yu, ; Wan et al ., ; Zeng et al ., ; Oyiga et al ., ).…”

Section: Harnessing the Genetic Diversity Of Exotic Germplasmmentioning

confidence: 99%

Salt stress under the scalpel – dissecting the genetics of salt tolerance

et al. 2019

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Summary Salt stress limits the productivity of crops grown under saline conditions, leading to substantial losses of yield in saline soils and under brackish and saline irrigation. Salt tolerant crops could alleviate these losses while both increasing irrigation opportunities and reducing agricultural demands on dwindling freshwater resources. However, despite significant efforts, progress towards this goal has been limited, largely because of the genetic complexity of salt tolerance for agronomically important yield‐related traits. Consequently, the focus is shifting to the study of traits that contribute to overall tolerance, thus breaking down salt tolerance into components that are more genetically tractable. Greater consideration of the plasticity of salt tolerance mechanisms throughout development and across environmental conditions furthers this dissection. The demand for more sophisticated and comprehensive methodologies is being met by parallel advances in high‐throughput phenotyping and sequencing technologies that are enabling the multivariate characterisation of vast germplasm resources. Alongside steady improvements in statistical genetics models, forward genetics approaches for elucidating salt tolerance mechanisms are gaining momentum. Subsequent quantitative trait locus and gene validation has also become more accessible, most recently through advanced techniques in molecular biology and genomic analysis, facilitating the translation of findings to the field. Besides fuelling the improvement of established crop species, this progress also facilitates the domestication of naturally salt tolerant orphan crops. Taken together, these advances herald a promising era of discovery for research into the genetics of salt tolerance in plants.

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“…One population of recombinant inbred lines (RILs) or near isogenic lines (NIL) derived from a cross between the salt-tolerant and the salt-sensitive inbred lines can be used to understand the maize response to salt stress and determine the salt tolerance mechanism by QTL mapping (Flowers, 2004; Lee et al, 2004; Wang Z.F. et al, 2012; Cui et al, 2015b). …”

Section: Introductionmentioning

confidence: 99%

Ability to Remove Na+ and Retain K+ Correlates with Salt Tolerance in Two Maize Inbred Lines Seedlings

Gao

et al. 2016

Front. Plant Sci.

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Maize is moderately sensitive to salt stress; therefore, soil salinity is a serious threat to its production worldwide. Here, excellent salt-tolerant maize inbred line TL1317 and extremely salt-sensitive maize inbred line SL1303 were screened to understand the maize response to salt stress and its tolerance mechanisms. Relative water content, membrane stability index, stomatal conductance, chlorophyll content, maximum photochemical efficiency, photochemical efficiency, shoot and root fresh/dry weight, and proline and water soluble sugar content analyses were used to identify that the physiological effects of osmotic stress of salt stress were obvious and manifested at about 3 days after salt stress in maize. Moreover, the ion concentration of two maize inbred lines revealed that the salt-tolerant maize inbred line could maintain low Na+ concentration by accumulating Na+ in old leaves and gradually shedding them to exclude excessive Na+. Furthermore, the K+ uptake and retention abilities of roots were important in maintaining K+ homeostasis for salt tolerance in maize. RNA-seq and qPCR results revealed some Na+/H+ antiporter genes and Ca2+ transport genes were up-regulated faster and higher in TL1317 than those in SL1303. Some K+ transport genes were down-regulated in SL1303 but up-regulated in TL1317. RNA-seq results, along with the phenotype and physiological results, suggested that the salt-tolerant maize inbred line TL1317 possesses more rapidly and effectively responses to remove toxic Na+ ions and maintain K+ under salt stress than the salt-sensitive maize inbred line SL1303. This response should facilitate cell homoeostasis under salt stress and result in salt tolerance in TL1317.

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QTL mapping for salt tolerance based on snp markers at the seedling stage in maize (Zea mays L.)

Cited by 46 publications

References 46 publications

Genome‐wide association study dissects the genetic bases of salt tolerance in maize seedlings

Genome‐wide association study dissects the genetic bases of salt tolerance in maize seedlings

Salt stress under the scalpel – dissecting the genetics of salt tolerance

Ability to Remove Na+ and Retain K+ Correlates with Salt Tolerance in Two Maize Inbred Lines Seedlings

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