Abstract
Abstract Understanding plant response and resilience to drought under a high CO 2 environment will be crucial to ensure crop production in the future. Sorghum bicolor is a C 4 plant that resists drought better than other crops, which could make it a good alternative to be grown under future climatic conditions. Here, we analyse the physiological response of sorghum under 350 ppm CO 2 (aCO 2 ) or 700 ppm CO 2 (eCO 2 ) with drought (D) or without drought (WW) for 9, 13 and 16 days; as well as its resilience under long (R1: 9D + 7R) or short (R2: 13D + 3R) recovery treatments. Sorghum showed elevated rates of gs under aCO 2 and WW, which resulted in a significant decrease in Ψ w , gs , E , Φ PSII , F v ’/F m ′ when exposed to drought. Consequently, A was greatly decreased. When re‐watered, both re‐watering treatments prioritized A recovery by restoring photosynthetic machinery under aCO 2 , whereas under eCO 2 plants required little recovery since plant were hardly affected by drought. However, sorghum growth rate for aboveground organs did not reach control values, indicating a slower long‐term recovery. Overall, these results provide information about the resilience of sorghum and its utility as a suitable candidate for the drought episodes of the future.
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Claims 6
Claim · model-written summary
Drought significantly decreased water potential, stomatal conductance and transpiration in sorghum relative to well-watered plants.
SorghumOrganisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sorghum showed elevated rates of gs under aCO 2 and WW, which resulted in a significant decrease in Ψ w , gs , E , Φ PSII , F v ’/F m ′ when exposed to drought”
e2“with drought (D) or without drought (WW) for 9, 13 and 16 days”
Claim · model-written summary
Drought significantly decreased photochemical efficiency (ΦPSII) and Fv′/Fm′ in sorghum relative to well-watered plants.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sorghum showed elevated rates of gs under aCO 2 and WW, which resulted in a significant decrease in Ψ w , gs , E , Φ PSII , F v ’/F m ′ when exposed to drought”
e2“with drought (D) or without drought (WW) for 9, 13 and 16 days”
Claim · model-written summary
Drought greatly decreased photosynthetic assimilation (A) in sorghum.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“Sorghum showed elevated rates of gs under aCO 2 and WW, which resulted in a significant decrease in Ψ w , gs , E , Φ PSII , F v ’/F m ′ when exposed to drought”
e3“Consequently, A was greatly decreased”
Claim · model-written summary
After re-watering, both re-watering treatments prioritized recovery of photosynthesis (A) under aCO2 by restoring the photosynthetic machinery.
- Taxon
- Sorghum bicolor
Sorghum bicolort0 - Treatment
- re‐wateringe4
- Outcome
- A recoverye4
- Qualifier
- restoring photosynthetic machinerye4
- Setting
- under aCO 2e4
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e4“When re‐watered, both re‐watering treatments prioritized A recovery by restoring photosynthetic machinery under aCO 2”
Claim · model-written summary
Under elevated CO2 sorghum needed little recovery after drought because plants were hardly affected by drought.
- Taxon
- Sorghum bicolorSorghum bicolort0
- Outcome
- recoverye5
- Qualifier
- hardly affected by droughte5
- Setting
- under eCO 2e5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Sorghum bicolor”
e5“whereas under eCO 2 plants required little recovery since plant were hardly affected by drought”
Claim · model-written summary
Sorghum aboveground growth rate did not reach control values after drought and re-watering.
Not reportedTreatmentDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e6“However, sorghum growth rate for aboveground organs did not reach control values”
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