Abstract
This study compares photosynthesis, growth, 13C and 15N labelling patterns of two biomass crops (Arundo donaxL. and Panicum virgatum L.) grown under water stress in greenhouse conditions. Plants were exposed to three water stresslevels: control (C, 100% Pot Capacity), mild stress (MS, 50% PC) and severe stress (SS, 25% PC). Photosynthesis,fluorescence parameters and relative water content were measured at the beginning (Ti) and the end of the experiment (Tf).Biomass parameters were measured at Tf. Short-term double labelling with 13C and 15N stable isotopes was performed in bothspecies. Isotopic analyses of total organic matter, total soluble sugars and the CO2 respired were undertaken at T0 (prelabelling),T1 (24h after labelling) and T2 (7 days after labelling). Immediately after the 13C and 15N labelling, stems andrhizomes seemed to be the main sinks for labelled carbon and nitrogen in both species. Moreover, not all of the labelled carbonand nitrogen substrate was used by plant metabolism after seven days. Decreases in photosynthesis parameters were observedas a consequence of the increase in water stress (WS) in both species, with a greater magnitude decline in giant reed than inswitchgrass. A decrease in height, number of green leaves and total dry weight due to WS was observed in both species. Bothspecies were more 13C-enriched and more 15N-depleted during the increases in WS due to lower stomatal conductance andtranspiration. In general, WS accelerated plant phenology and, consequently, the accumulation of storage compounds in therhizome occurred in response to stress. This effect was more clearly visible in switchgrass than in giant reed.
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Claims 7
Claim · model-written summary
Stems and rhizomes appeared to be the main sinks for labeled carbon and nitrogen in both crops.
- Taxon
- Arundo donaxL. and Panicum virgatum L.
Arundo donax
Panicum virgatume7 - Organ / stage
- stems andrhizomese0
- Outcome
- main sinks for labelled carbon and nitrogene0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“stems andrhizomes seemed to be the main sinks for labelled carbon and nitrogen in both species”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Some labeled carbon and nitrogen remained unused after seven days.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Outcome
- not all of the labelled carbonand nitrogen substrate was used by plant metabolisme0
- Qualifier
- after seven dayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“not all of the labelled carbonand nitrogen substrate was used by plant metabolism after seven days”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Increasing water stress decreased photosynthesis parameters in both crops, more strongly in giant reed.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Treatment
- increase in water stress (WS)e0
- Outcome
- photosynthesis parameterse0
- Direction
- Decreasese0
- Qualifier
- greater magnitude decline in giant reede0
- Comparator
- switchgrasse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Decreases in photosynthesis parameters were observedas a consequence of the increase in water stress (WS) in both species, with a greater magnitude decline in giant reed than inswitchgrass”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Water stress reduced plant height, green leaf number and dry weight in both crops.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Treatment
- WSe0
- Outcome
- height, number of green leaves and total dry weighte0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A decrease in height, number of green leaves and total dry weight due to WS was observed in both species”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Increasing water stress increased 13C enrichment and 15N depletion in both crops.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Treatment
- increases in WSe0
- Outcome
- more 13C-enriched and more 15N-depletede0
- Direction
- more 13C-enrichede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Bothspecies were more 13C-enriched and more 15N-depleted during the increases in WS”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Water stress generally accelerated phenology in both crops.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Treatment
- WSe0
- Outcome
- plant phenologye0
- Direction
- acceleratede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“WS accelerated plant phenology”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
Claim · model-written summary
Storage compounds accumulated in rhizomes in response to stress, more clearly in switchgrass.
- Taxon
- Arundo donaxL. and Panicum virgatum L.Arundo donaxPanicum virgatume7
- Organ / stage
- rhizomee0
- Treatment
- stresse0
- Outcome
- accumulation of storage compoundse0
- Comparator
- giant reede0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the accumulation of storage compounds in therhizome occurred in response to stress. This effect was more clearly visible in switchgrass than in giant reed”
e7“two biomass crops (Arundo donaxL. and Panicum virgatum L.)”
The same questions in other papers
drought · growth · Arundo donax (giant reed)Positive and negative results
3 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- no effect
1 paper more in this group
See all 5 papers →drought · physiology: photosynthesis · Panicum virgatum (switchgrass)Positive and negative results
4 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
2 papers more in this group
See all 6 papers →drought · physiology: photosynthesis · Arundo donax (giant reed)Results agree
1 paper in the same direction as this paper
- negative
drought · growth · Panicum virgatum (switchgrass)Results agree
4 papers in the same direction as this paper
- no effect
- negative
- negative
1 paper more in this group
See all 5 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.