Abstract
Water stress (drought and flood) is one of the major factors that limits sugarcane growth and yield. The two greenhouse experiments were conducted at Khon Kaen University, Thailand. The first experiment investigated the individual and combined effects of droughts and floods on two sugarcane cultivars. The results showed that photosynthetic potential, based on chlorophyll a fluorescence (PSII) and chlorophyll content, exhibited a response to the water regime treatments. However, stomatal conductance in the K93-219 cultivar was higher than the KK3 cultivar. Similarly, plant height, number of tillers, number of stems, fresh stem weight, and sugar quality were not affected by the varying water regime conditions imposed on both of the sugarcane cultivars. However, drought or flood conditions, whether alone or in combination, reduced the fresh stem weight, with regards to the water regimes and cultivars. In general, a combination of drought and flood reduced the fresh stem weight as opposed to drought or flood alone. The KK3 cultivar gave a higher fresh stem weight than the K93-219 cultivar under dual stress conditions. The second experiment investigated the auxin application rates at different growth stages on two sugarcane cultivars under flood conditions. The results revealed that the application of auxin at 10 mg L−1 increased the number, and fresh weight, of adventitious roots over the control (0 mg L−1). The cultivar K93-219 produced a higher number, and fresh weight, of adventitious roots. However, the amount of aerenchyma in the adventitious roots was not affected by auxin application rates, growth stages, or cultivars. Similarly, plant height, leaf width, number of stems, fresh stem weight, and sugar quality were not affected by auxin rates. Auxin application at five months of age increased leaf width and fresh stem weight over the control. The cultivar K93-219 tended to produce a higher fresh stem weight than the KK3 cultivar.
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Claims 12
Claim · model-written summary
Photosynthetic potential and chlorophyll content responded to water regimes.
- Taxon
- Sugarcanet0
- Treatment
- water regime treatmentse0
- Outcome
- photosynthetic potential, based on chlorophyll a fluorescence (PSII) and chlorophyll contente0
Not reportedComparatorDirection
Verbatim
e0“photosynthetic potential, based on chlorophyll a fluorescence (PSII) and chlorophyll content, exhibited a response to the water regime treatments.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
K93-219 had higher stomatal conductance than KK3.
Verbatim
e0“stomatal conductance in the K93-219 cultivar was higher than the KK3 cultivar.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Plant height, tiller and stem counts, stem weight and sugar quality were reported unaffected by water regimes.
- Taxon
- sugarcanee0
- Treatment
- varying water regime conditionse0
- Outcome
- plant height, number of tillers, number of stemse0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“plant height, number of tillers, number of stems, fresh stem weight, and sugar quality were not affected by the varying water regime conditions imposed on both of the sugarcane cultivars.”
Claim · model-written summary
Drought and flood conditions reduced fresh stem weight.
Not reportedComparator
Verbatim
e0“drought or flood conditions, whether alone or in combination, reduced the fresh stem weight, with regards to the water regimes and cultivars.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Combined drought and flood reduced fresh stem weight versus either stress alone.
Verbatim
e0“a combination of drought and flood reduced the fresh stem weight as opposed to drought or flood alone.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
KK3 had higher fresh stem weight than K93-219 under dual stress.
Verbatim
e0“The KK3 cultivar gave a higher fresh stem weight than the K93-219 cultivar under dual stress conditions.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Auxin at 10 mg L−1 increased adventitious root number and fresh weight versus control.
Verbatim
e0“the application of auxin at 10 mg L−1 increased the number, and fresh weight, of adventitious roots over the control (0 mg L−1).”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
K93-219 produced more and heavier adventitious roots.
Verbatim
e0“The cultivar K93-219 produced a higher number, and fresh weight, of adventitious roots.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Adventitious-root aerenchyma was unaffected by auxin rates, growth stages or cultivars.
- Taxon
- Sugarcanet0
- Treatment
- auxin application ratese0
- Outcome
- amount of aerenchyma in the adventitious rootse0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“the amount of aerenchyma in the adventitious roots was not affected by auxin application rates, growth stages, or cultivars.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Auxin rates did not affect plant height, leaf width, stem count, stem weight or sugar quality.
- Taxon
- Sugarcanet0
- Treatment
- auxin ratese0
- Outcome
- plant height, leaf width, number of stemse0
- Direction
- not affectede0
Not reportedComparator
Verbatim
e0“plant height, leaf width, number of stems, fresh stem weight, and sugar quality were not affected by auxin rates.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
Auxin at five months increased leaf width and stem weight versus control.
Verbatim
e0“Auxin application at five months of age increased leaf width and fresh stem weight over the control.”
t0“Two Sugarcane Cultivars”
Claim · model-written summary
K93-219 tended to produce greater stem weight than KK3.
Verbatim
e0“The cultivar K93-219 tended to produce a higher fresh stem weight than the KK3 cultivar.”
t0“Two Sugarcane Cultivars”
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