Abstract
SUMMARY This study was conducted to investigate the physiological response of sugarcane genotypes to drought and its consequence for stalk yield. Sugarcane genotypes IACSP94-2094, IACSP96-2042 and SP87-365 were subjected to water deficit during the initial growth phase by withholding water. Resistance and sensitivity patterns were defined by the impact of drought on the stalk yield and content of soluble solids in the stalk juice. IACSP94-2094 and SP87-365 were considered drought-resistant genotypes, as the stalk dry matter production and yield of soluble solids were not reduced by the water deficit. Although drought caused reductions in leaf gas exchange in all the genotypes, IACSP96-2042 was most affected when considering the cumulative reduction in photosynthesis throughout the experimental period. This photosynthetic impairment of IACSP96-2042 was related to both non-stomatal and stomatal limitations, whereas photosynthesis in SP87-365 and IACSP94-2094 were only stomatally limited under drought. In general, a reduced photosynthetic sensitivity to water deficit was an important physiological trait for dry matter production in sugarcane plants, and the concentrations of soluble carbohydrates, sucrose, starch and proline in the leaves did not reveal consistent differences between the patterns of resistance and sensitivity. Even though IACSP96-2042 was severely affected by water shortage, this genotype presented a similar stalk yield under drought and the highest stalk yield under well-watered conditions when compared to the other genotypes. This response to variable water conditions is interesting for regions with seasonal drought, whereas the pattern of drought resistance is more appropriate for regions in which drought occurs for long periods during the crop season. Our findings are also discussed from the point of view that increases in sugarcane yield and sustainable agriculture may be reached by choosing the best genotype for each specific environmental condition.
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Claims 11
Claim · model-written summary
IACSP94-2094 retained stalk dry matter production and soluble solids yield under water deficit.
- Taxon
- SUGARCANEt0
- Material
- IACSP94-2094e0
- Treatment
- water deficite0
- Outcome
- stalk dry matter production and yield of soluble solidse0
- Direction
- not reducede0
Not reportedComparator
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“IACSP94-2094 and SP87-365 were considered drought-resistant genotypes, as the stalk dry matter production and yield of soluble solids were not reduced by the water deficit.”
Claim · model-written summary
SP87-365 retained stalk dry matter production and soluble solids yield under water deficit.
- Taxon
- SUGARCANEt0
- Material
- SP87-365e0
- Treatment
- water deficite0
- Outcome
- stalk dry matter production and yield of soluble solidse0
- Direction
- not reducede0
Not reportedComparator
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“IACSP94-2094 and SP87-365 were considered drought-resistant genotypes, as the stalk dry matter production and yield of soluble solids were not reduced by the water deficit.”
Claim · model-written summary
Drought reduced leaf gas exchange in all three sugarcane genotypes.
Not reportedComparator
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“drought caused reductions in leaf gas exchange in all the genotypes”
Claim · model-written summary
IACSP96-2042 had the greatest cumulative photosynthetic reduction.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“IACSP96-2042 was most affected when considering the cumulative reduction in photosynthesis throughout the experimental period”
Claim · model-written summary
Photosynthesis in IACSP96-2042 was limited by stomatal and non-stomatal factors during drought.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“This photosynthetic impairment of IACSP96-2042 was related to both non-stomatal and stomatal limitations”
Claim · model-written summary
Photosynthesis in SP87-365 was limited only stomatally under drought.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“photosynthesis in SP87-365 and IACSP94-2094 were only stomatally limited under drought”
Claim · model-written summary
Photosynthesis in IACSP94-2094 was limited only stomatally under drought.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“photosynthesis in SP87-365 and IACSP94-2094 were only stomatally limited under drought”
Claim · model-written summary
Reduced photosynthetic sensitivity to water deficit was important for sugarcane dry matter production.
- Taxon
- sugarcanee0
- Treatment
- water deficite0
- Outcome
- dry matter productione0
- Qualifier
- reduced photosynthetic sensitivity to water deficite0
Not reportedDirection
Verbatim
e0“a reduced photosynthetic sensitivity to water deficit was an important physiological trait for dry matter production in sugarcane plants”
Claim · model-written summary
Leaf soluble carbohydrates, sucrose, starch and proline concentrations did not consistently distinguish resistant and sensitive genotypes.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“the concentrations of soluble carbohydrates, sucrose, starch and proline in the leaves did not reveal consistent differences between the patterns of resistance and sensitivity”
Claim · model-written summary
IACSP96-2042 had a similar stalk yield under drought to the other genotypes.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“IACSP96-2042 was severely affected by water shortage, this genotype presented a similar stalk yield under drought and the highest stalk yield under well-watered conditions when compared to the other genotypes”
Claim · model-written summary
IACSP96-2042 had the highest stalk yield under well-watered conditions.
Verbatim
t0“REVEALING DROUGHT-RESISTANCE AND PRODUCTIVE PATTERNS IN SUGARCANE GENOTYPES”
e0“IACSP96-2042 was severely affected by water shortage, this genotype presented a similar stalk yield under drought and the highest stalk yield under well-watered conditions when compared to the other genotypes”
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See all 8 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.