Abstract
To investigate the processes involved in the susceptibility of sugarcane plants to water deficit, several physiological parameters were evaluated in drought tolerant (SP83-2847 and CTC15) and sensitive (SP86-155) cultivars. The water deficit affected the photosynthetic apparatus of all the plants in different ways, within and among cultivars. The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit. In control plants of the tolerant cultivars (SP83-2847 and CTC15) the photosynthetic rate was higher than in the sensitive cultivar (SP86-155). Cultivar CTC15 showed the highest relative water content during the dry period. The quantum efficiency photosystem II of cultivar SP83-2847 was more stable in the last days of the experimental treatment, suggesting that the decline in relative water content stimulated an adjustment of photosynthetic capacity to tolerate the changes in water availability. As a whole, the tolerant SP83-2847 and CTC15 cultivars exhibited a better photosynthetic performance than the sensitive SP86-155 cultivar. The data suggest that these physiological parameters can be used in the evaluation and distinction of drought tolerant and sensitive sugarcane genotypes.
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Claims 8
Claim · model-written summary
Water deficit significantly decreased photosynthetic rate in all tested sugarcane cultivars.
Not reportedComparator
Verbatim
e0“The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit.”
t0“sugarcane cultivars”
Claim · model-written summary
Water deficit significantly decreased stomatal conductance in all tested sugarcane cultivars.
Not reportedComparator
Verbatim
e0“The photosynthetic rate and stomatal conductance decreased significantly in all cultivars submitted to water deficit.”
t0“sugarcane cultivars”
Claim · model-written summary
Under control conditions, SP83-2847 and CTC15 had higher photosynthetic rates than SP86-155.
Verbatim
e0“In control plants of the tolerant cultivars (SP83-2847 and CTC15) the photosynthetic rate was higher than in the sensitive cultivar (SP86-155).”
t0“sugarcane cultivars”
Claim · model-written summary
CTC15 had the highest relative water content during the dry period.
Verbatim
e0“Cultivar CTC15 showed the highest relative water content during the dry period.”
t0“sugarcane cultivars”
Claim · model-written summary
SP83-2847 maintained more stable photosystem II quantum efficiency in the last days of treatment.
Verbatim
e0“The quantum efficiency photosystem II of cultivar SP83-2847 was more stable in the last days of the experimental treatment”
t0“sugarcane cultivars”
Claim · model-written summary
The authors suggest that declining relative water content stimulated adjustment of photosynthetic capacity in SP83-2847.
Verbatim
e0“suggesting that the decline in relative water content stimulated an adjustment of photosynthetic capacity to tolerate the changes in water availability”
e1“The quantum efficiency photosystem II of cultivar SP83-2847 was more stable”
t0“sugarcane cultivars”
Claim · model-written summary
The tolerant SP83-2847 and CTC15 cultivars had better photosynthetic performance than SP86-155.
Verbatim
e0“the tolerant SP83-2847 and CTC15 cultivars exhibited a better photosynthetic performance than the sensitive SP86-155 cultivar.”
t0“sugarcane cultivars”
Claim · model-written summary
The authors suggest these physiological parameters can distinguish drought tolerant and sensitive sugarcane genotypes.
Verbatim
e0“these physiological parameters can be used in the evaluation and distinction of drought tolerant and sensitive sugarcane genotypes”
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