Abstract
Switchgrass (Panicum virgatum) is a promising bioenergy crop due in part to its resilience to drought stress. However, the significance of drought timing remains poorly understood, both from a plant biology perspective and in terms of its impact on downstream biofuel production. This study determines the developmental stage-specific physiological and metabolic responses of switchgrass to drought stress and their implications for biofuel production using a custom-built programmable irrigation system. Vegetative-, flowering-, and senescence-stage drought significantly reduced carbon dioxide assimilation and stomatal conductance without affecting biomass yield. Metabolic profiling revealed significant accumulation of glucose, fructose, quinic acid, shikimate, and γ-aminobutyric acid (GABA) during vegetative-stage drought, while flowering and senescence stages exhibited limited metabolic changes. Similarly, specialized metabolites also displayed distinct developmental patterns, with vegetative-stage drought driving the most pronounced metabolic alterations. Thermochemically treated and hydrolyzed switchgrass biomass from vegetative-stage drought showed elevated lignocellulose-derived compounds and saponins, with the latter most positively correlating with fermentation lag times. Conversely, senescence-stage drought enhanced ethanol yields while lowering saponin levels in the hydrolysates. While vegetative-stage drought enhanced physiological resilience, it compromises downstream biofuel production by introducing fermentation inhibitors, particularly saponins.
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Claims 11
Claim · model-written summary
Drought at vegetative, flowering and senescence stages significantly reduced carbon dioxide assimilation and stomatal conductance in switchgrass.
- Taxon
- Panicum virgatum
Panicum virgatume0 - Treatment
- Vegetative-, flowering-, and senescence-stage droughte1
- Outcome
- carbon dioxide assimilation and stomatal conductancee1
- Direction
- reducede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Vegetative-, flowering-, and senescence-stage drought significantly reduced carbon dioxide assimilation and stomatal conductance without affecting biomass yield”
Claim · model-written summary
Drought at vegetative, flowering and senescence stages did not change switchgrass biomass yield.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- Vegetative-, flowering-, and senescence-stage droughte1
- Outcome
- biomass yielde1
- Direction
- no_changeinferrede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Vegetative-, flowering-, and senescence-stage drought significantly reduced carbon dioxide assimilation and stomatal conductance without affecting biomass yield”
Claim · model-written summary
Vegetative-stage drought significantly increased glucose, fructose and quinic acid in switchgrass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- vegetative-stage droughte1
- Outcome
- glucose, fructose, quinic acide1
- Direction
- accumulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Metabolic profiling revealed significant accumulation of glucose, fructose, quinic acid, shikimate, and γ-aminobutyric acid (GABA) during vegetative-stage drought”
Claim · model-written summary
Vegetative-stage drought significantly increased shikimate and GABA in switchgrass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- vegetative-stage droughte1
- Outcome
- shikimate, and γ-aminobutyric acid (GABA)e1
- Direction
- accumulatione1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Metabolic profiling revealed significant accumulation of glucose, fructose, quinic acid, shikimate, and γ-aminobutyric acid (GABA) during vegetative-stage drought”
Claim · model-written summary
Vegetative-stage drought drove the most pronounced metabolic alterations in switchgrass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- vegetative-stage droughte1
- Outcome
- metabolic alterationse1
- Direction
- most pronouncede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“vegetative-stage drought driving the most pronounced metabolic alterations”
Claim · model-written summary
Vegetative-stage drought elevated lignocellulose-derived compounds and saponins in hydrolysates of switchgrass biomass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- vegetative-stage droughte1
- Outcome
- lignocellulose-derived compounds and saponinse1
- Direction
- elevatede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Thermochemically treated and hydrolyzed switchgrass biomass from vegetative-stage drought showed elevated lignocellulose-derived compounds and saponins”
Claim · model-written summary
Saponin levels were most positively correlated with fermentation lag times in switchgrass hydrolysates.
- Taxon
- Panicum virgatumPanicum virgatume0
- Compound
- saponinse2
- Outcome
- fermentation lag timese1
- Direction
- most positively correlatinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“with the latter most positively correlating with fermentation lag times”
e2“lignocellulose-derived compounds and saponins”
Claim · model-written summary
Senescence-stage drought enhanced ethanol yields from switchgrass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- senescence-stage droughte1
- Outcome
- ethanol yieldse1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“senescence-stage drought enhanced ethanol yields”
Claim · model-written summary
Senescence-stage drought lowered saponin levels in switchgrass hydrolysates.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- senescence-stage droughte1
- Outcome
- saponin levelse1
- Direction
- loweringe1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“Conversely, senescence-stage drought enhanced ethanol yields while lowering saponin levels in the hydrolysates”
Claim · model-written summary
Vegetative-stage drought compromises downstream biofuel production through saponins acting as fermentation inhibitors.
- Taxon
- Panicum virgatumPanicum virgatume0
- Compound
- saponinse1
- Outcome
- downstream biofuel productione1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“While vegetative-stage drought enhanced physiological resilience, it compromises downstream biofuel production by introducing fermentation inhibitors, particularly saponins”
Claim · model-written summary
Vegetative-stage drought enhanced physiological resilience of switchgrass.
- Taxon
- Panicum virgatumPanicum virgatume0
- Treatment
- vegetative-stage droughte1
- Outcome
- physiological resiliencee1
- Direction
- enhancede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Switchgrass (Panicum virgatum)”
e1“While vegetative-stage drought enhanced physiological resilience, it compromises downstream biofuel production by introducing fermentation inhibitors, particularly saponins”
The same questions in other papers
drought · molecular: metabolites · Panicum virgatum (switchgrass)Results differ
1 paper in the same direction as this paper · 3 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 papers →drought · yield · Panicum virgatum (switchgrass)Results differ
4 in the opposite direction
- negative
- negative
- negative
1 paper more in this group
See all 5 papers →stage · yield · Panicum virgatum (switchgrass)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction · 1 reporting no difference from an alternative
- negative
- no effect
- positive
drought · physiology: gas exchange · Panicum virgatum (switchgrass)Results agree
2 papers in the same direction as this paper
- no effect
- negative
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.