Abstract
The genetic and physiological mechanisms underlying the relationship between water-soluble carbohydrates (WSC) and water stress tolerance are scarcely known. This study aimed to evaluate the main WSC in stems, and the expression of genes involved in fructan metabolism in wheat genotypes growing in a glasshouse with water stress (WS; 50% field capacity from heading) and full irrigation (FI; 100% field capacity). Eight wheat genotypes (five tolerant and three susceptible to water stress) were evaluated initially (experiment 1) and the two most contrasting genotypes in terms of WSC accumulation were evaluated in a subsequent experiment (experiment 2). Maximum accumulation of WSC occurred 10-20 days after anthesis. Under WS, the stress-tolerant genotype exhibited higher concentrations of WSC, glucose, fructose and fructan in the stems, compared to FI. In addition, the stress-tolerant genotype exhibited higher up-regulation of the fructan 1-fructosyltransferase B (1-FFTB) and fructan 1-exohydrolase w2 (1-FEHw2) genes, whereas the susceptible cultivar presented an up-regulation of the fructan 6-fructosyltransferase (6-SFT) and fructan 1-exohydrolase w3 (1-FEHw3) genes. Our results indicated clear differences in the pattern of WSC accumulation and the expression of genes regulating fructan metabolism between the tolerant and susceptible genotypes under WS.
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Claims 5
Claim · model-written summary
Under water stress, the stress-tolerant wheat genotype had higher stem concentrations of WSC, glucose and fructose than under full irrigation.
- Taxon
- wheat
Triticum aestivume5 - Material
- stress-tolerant genotypee1
- Organ / stage
- stemse1
- Treatment
- water stress (WS; 50% field capacity from heading)e0
- Outcome
- WSC, glucose, fructosee1
- Direction
- highere1
- Comparator
- full irrigation (FI; 100% field capacity)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growing in a glasshouse with water stress (WS; 50% field capacity from heading) and full irrigation (FI; 100% field capacity)”
e1“Under WS, the stress-tolerant genotype exhibited higher concentrations of WSC, glucose, fructose and fructan in the stems, compared to FI”
e5“Eight wheat genotypes (five tolerant and three susceptible to water stress)”
Claim · model-written summary
Under water stress, the stress-tolerant wheat genotype had higher stem fructan than under full irrigation.
- Taxon
- wheatTriticum aestivume5
- Material
- stress-tolerant genotypee1
- Organ / stage
- stemse1
- Treatment
- water stress (WS; 50% field capacity from heading)e0
- Outcome
- fructane1
- Direction
- highere1
- Comparator
- full irrigation (FI; 100% field capacity)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“growing in a glasshouse with water stress (WS; 50% field capacity from heading) and full irrigation (FI; 100% field capacity)”
e1“Under WS, the stress-tolerant genotype exhibited higher concentrations of WSC, glucose, fructose and fructan in the stems, compared to FI”
e5“Eight wheat genotypes (five tolerant and three susceptible to water stress)”
Claim · model-written summary
The stress-tolerant wheat genotype showed higher up-regulation of 1-FFTB and 1-FEHw2 than the susceptible cultivar.
- Taxon
- wheatTriticum aestivume5
- Material
- stress-tolerant genotypee2
- Gene
- 1-FFTBe2
- Outcome
- up-regulatione2
- Direction
- highere2
- Qualifier
- 1-FEHw2e2
- Comparator
- susceptible cultivare3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“the stress-tolerant genotype exhibited higher up-regulation of the fructan 1-fructosyltransferase B (1-FFTB) and fructan 1-exohydrolase w2 (1-FEHw2) genes”
e3“whereas the susceptible cultivar presented an up-regulation of the fructan 6-fructosyltransferase (6-SFT) and fructan 1-exohydrolase w3 (1-FEHw3) genes”
e5“Eight wheat genotypes (five tolerant and three susceptible to water stress)”
Claim · model-written summary
The susceptible wheat cultivar showed up-regulation of 6-SFT and 1-FEHw3 under water stress.
- Taxon
- wheatTriticum aestivume5
- Material
- susceptible cultivare3
- Gene
- 6-SFTe3
- Outcome
- up-regulatione3
- Direction
- up-regulatione3
- Qualifier
- 1-FEHw3e3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e3“whereas the susceptible cultivar presented an up-regulation of the fructan 6-fructosyltransferase (6-SFT) and fructan 1-exohydrolase w3 (1-FEHw3) genes”
e5“Eight wheat genotypes (five tolerant and three susceptible to water stress)”
Claim · model-written summary
Maximum accumulation of WSC in wheat stems occurred 10-20 days after anthesis.
- Taxon
- wheatTriticum aestivume5
- Outcome
- Maximum accumulation of WSCe4
- Value
- 10-20 days after anthesise4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“Maximum accumulation of WSC occurred 10-20 days after anthesis”
e5“Eight wheat genotypes (five tolerant and three susceptible to water stress)”
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