Abstract
Abstract Drought is one of the main factors affecting the productivity of agricultural crops, and plants respond to such stress by activating various physiological and biochemical mechanisms against dehydration. The present study investigated two varieties of sugarcane ( Saccharum spp.) with contrasting responses to drought (RB867515, more tolerant; and RB855536, less tolerant) and subjected them to progressive drought conditions (2, 4, 6 and 8 days) followed by rehydration. Drought caused a decrease in water potential (ψ w ) and osmotic potential (ψ os ) in the leaves, which recovered to normal levels after rehydration only up to the fourth day of drought. Water stress changed the carbon metabolism of leaves by reducing starch and sucrose contents and increasing glucose and fructose contents in both varieties. Water deficit caused a significant reduction in the maximum quantum efficiency of photosystem II (F v /F m ) and effective quantum yield (Φ PSII ) in both varieties; however, RB867515 recovered faster after rehydration. Under water stress, the more tolerant variety RB867515 exhibited increased activity of the antioxidant enzymes catalase, ascorbate peroxidase and superoxide dismutase compared with the RB855536 variety. The results suggest that RB867515 is more tolerant to drought conditions because of a more efficient antioxidant system, which results in reduced photosynthesis photoinhibition during water stress, thus revealing itself as a potential physiological marker for drought tolerance studies.
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Claims 10
Claim · model-written summary
Drought reduced leaf water and osmotic potentials.
- Taxon
- sugarcanet0
- Organ / stage
- leavese0
- Treatment
- Droughte0
- Outcome
- water potential (ψ w ) and osmotic potential (ψ os )e0
- Direction
- decreasee0
Not reportedComparator
Verbatim
e0“Drought caused a decrease in water potential (ψ w ) and osmotic potential (ψ os ) in the leaves”
t0“sugarcane”
Claim · model-written summary
These potentials recovered after rehydration only through four days of drought.
Verbatim
e0“which recovered to normal levels after rehydration only up to the fourth day of drought”
e1“water potential (ψ w ) and osmotic potential (ψ os )”
t0“sugarcane”
Claim · model-written summary
Water stress reduced leaf starch and sucrose.
- Taxon
- sugarcanet0
- Organ / stage
- leavese0
- Treatment
- Water stresse0
- Outcome
- starch and sucrose contentse0
- Direction
- reducinge0
Not reportedComparator
Verbatim
e0“Water stress changed the carbon metabolism of leaves by reducing starch and sucrose contents”
t0“sugarcane”
Claim · model-written summary
Water stress increased leaf glucose and fructose.
Not reportedComparator
Verbatim
e0“increasing glucose and fructose contents in both varieties”
e1“Water stress changed the carbon metabolism of leaves”
t0“sugarcane”
Claim · model-written summary
Water deficit significantly reduced maximum photosystem II quantum efficiency.
- Taxon
- sugarcanet0
- Treatment
- Water deficite0
- Outcome
- maximum quantum efficiency of photosystem II (F v /F m )e0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“Water deficit caused a significant reduction in the maximum quantum efficiency of photosystem II (F v /F m )”
t0“sugarcane”
Claim · model-written summary
Water deficit significantly reduced effective quantum yield.
- Taxon
- sugarcanet0
- Treatment
- Water deficite0
- Outcome
- effective quantum yield (Φ PSII )e0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“Water deficit caused a significant reduction in the maximum quantum efficiency of photosystem II (F v /F m ) and effective quantum yield (Φ PSII )”
t0“sugarcane”
Claim · model-written summary
RB867515 recovered faster after rehydration.
Verbatim
e0“RB867515 recovered faster after rehydration”
t0“sugarcane”
Claim · model-written summary
RB867515 had increased catalase, ascorbate peroxidase and superoxide dismutase activities relative to RB855536 under water stress.
Verbatim
e0“Under water stress, the more tolerant variety RB867515 exhibited increased activity of the antioxidant enzymes catalase, ascorbate peroxidase and superoxide dismutase compared with the RB855536 variety”
t0“sugarcane”
Claim · model-written summary
The authors attributed greater drought tolerance in RB867515 to more efficient antioxidants and reduced photosynthetic photoinhibition.
Verbatim
e0“RB867515 is more tolerant to drought conditions because of a more efficient antioxidant system, which results in reduced photosynthesis photoinhibition during water stress”
t0“sugarcane”
Claim · model-written summary
The antioxidant response was proposed as a physiological marker of drought tolerance.
Verbatim
e0“a potential physiological marker for drought tolerance studies”
e1“more efficient antioxidant system”
t0“sugarcane”
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