Abstract
Abstract Sweet and biomass sorghum are expected to contribute increasingly to bioenergy production. Better understanding the impacts of the genotypic and environmental variabilities on biomass component traits and their properties is essential to optimize energy yields. This study aimed to evaluate whether traits contributing to stem biomass growth and biochemical composition at different biological scales (co)vary with the genotype and the water status in sorghum. Height genotypes were studied over two years in field conditions in southern France under two water treatments (well watered vs. 25 days’ dry down during stem elongation). Main stem internode number, size, (non)structural carbohydrate, and lignin contents were measured at the end of the stress period and/or at final harvest, together with biochemical and histological analyses of the youngest expanded internode. The tallest genotypes showed the highest stem dry weights and lignin contents. Stem (structural) biomass density was positively correlated with lignin content, particularly in internode parenchyma. Stem soluble sugar and lignin contents were inversely proportional across genotypes and water conditions. Genotypes contrasted for drought sensitivity and recovery capacity of stem growth and biochemical composition. The length and cell wall deposition of internodes expanding under water deficit were reduced and did not recover, these responses being weakly correlated. Genotypic variability was pointed out in the growth recovery of internodes expanding under re‐watered conditions. According to the observed genotypic variability and the absence of antagonistic correlations between the responses of the different traits to water availability, it is suggested that biomass sorghum varieties optimizing their responses to water availability in terms of growth and cell wall deposition can be developed for different bioenergy targets.
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Claims 9
Claim · model-written summary
The tallest sorghum genotypes had the highest stem dry weights and lignin contents.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The tallest genotypes showed the highest stem dry weights and lignin contents.”
t0“sorghum”
Claim · model-written summary
Stem structural biomass density correlated positively with lignin content, especially in internode parenchyma.
- Organ / stage
- internode parenchymae0
- Compound
- lignine0
- Outcome
- Stem (structural) biomass densitye0
- Direction
- positively correlatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem (structural) biomass density was positively correlated with lignin content, particularly in internode parenchyma.”
t0“sorghum”
Claim · model-written summary
Stem soluble sugar and lignin contents were inversely proportional across genotypes and water conditions.
- Compound
- lignine0
- Outcome
- Stem soluble sugare0
- Direction
- inversely proportionale0
- Qualifier
- across genotypes and water conditionse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Stem soluble sugar and lignin contents were inversely proportional across genotypes and water conditions.”
t0“sorghum”
Claim · model-written summary
Genotypes differed in drought sensitivity and recovery of stem growth and biochemical composition.
- Material
- Genotypese0
- Outcome
- drought sensitivity and recovery capacity of stem growth and biochemical compositione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypes contrasted for drought sensitivity and recovery capacity of stem growth and biochemical composition.”
t0“sorghum”
Claim · model-written summary
Water deficit reduced the length of expanding internodes, without subsequent recovery.
- Organ / stage
- internodese0
- Treatment
- water deficite0
- Outcome
- lengthe0
- Direction
- reducede0
- Comparator
- well waterede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and cell wall deposition of internodes expanding under water deficit were reduced and did not recover”
e1“well watered vs. 25 days’ dry down during stem elongation”
t0“sorghum”
Claim · model-written summary
Water deficit reduced cell wall deposition in expanding internodes, without subsequent recovery.
- Organ / stage
- internodese0
- Treatment
- water deficite0
- Outcome
- cell wall depositione0
- Direction
- reducede0
- Comparator
- well waterede1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The length and cell wall deposition of internodes expanding under water deficit were reduced and did not recover”
e1“well watered vs. 25 days’ dry down during stem elongation”
t0“sorghum”
Claim · model-written summary
The length and deposition responses to water deficit were weakly correlated.
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“these responses being weakly correlated”
e1“internodes expanding under water deficit”
t0“sorghum”
Claim · model-written summary
Growth recovery of internodes expanding after re-watering varied by genotype.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Genotypic variability was pointed out in the growth recovery of internodes expanding under re‐watered conditions.”
t0“sorghum”
Claim · model-written summary
Biomass sorghum varieties can be developed to optimize growth and cell wall deposition responses to water availability for different bioenergy targets.
- Outcome
- biomass sorghum varieties optimizing their responses to water availability in terms of growth and cell wall deposition can be developede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it is suggested that biomass sorghum varieties optimizing their responses to water availability in terms of growth and cell wall deposition can be developed for different bioenergy targets.”
The same questions in other papers
drought · growth · SorghumResults differ
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- negative
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See all 73 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.