Abstract
[Objective]The present study was conducted to investigate the differences of drought resistance in different sugarcane cultivars at different growth stages to provide references for drought resistance evaluation and sugarcane breeding. [Method]Three sugarcane cultivars viz., GT28, GT21 and ROC22,planted in buckets,were used as test materials. Plant height and seven other indexes were determined under natural drought stress, and drought resistance was evaluated using subordinate function in fuzzy mathematics. [Result]Under repeated drought stress, growth vigor of sugarcane plant slowed down, water potential and chlorophyll content in leaves were reduced, and cytoplasm membrane permeability and content of proline and malondialdehyde in leaves increased. For different growth stages, sugarcane growth vigor, water potential, proline content and peroxidase (POD) activity in sugarcane leaves changed more significantly at seedling stage, while malondialdehyde content, leaf cytoplasmic membrane permeability and content of soluble protein and chlorophyll in leaves changed more obviously at elongation stage. Among different sugarcane cultivars, GT21 had relative higher contents of water potential, malondialdehyde, soluble protein, and chlorophyll and lower cytoplasm membrane permeability, free proline content, and POD activity; ROC22 had higher plant height, the cytoplasm membrane permeability, proline content, and POD activity; however it had lower water potential, malondialdehyde, and soluble protein content in leaves compared to those of GT21. The overall drought resistance of the three sugarcane cultivars were as followed: GT21 ROC22 GT28. [Conclusion]Agronomic traits and physiological indexes showed significant differences in different sugarcane varieties under drought stress, but no obviously consistant and accumulative effects of repeated drought stress (at seedling and elongating stages) were found. Subordinate function method could more accurately and comprehensively evaluate the drought resistance of sugarcane cultivars.
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Claims 17
Claim · model-written summary
Repeated drought slowed sugarcane growth vigor.
Not reportedComparator
Verbatim
e0“Under repeated drought stress, growth vigor of sugarcane plant slowed down”
Claim · model-written summary
Repeated drought reduced sugarcane leaf water potential and chlorophyll content.
- Taxon
- sugarcanee0
- Treatment
- repeated drought stresse0
- Outcome
- water potential and chlorophyll content in leavese0
- Direction
- reducede0
Not reportedComparator
Verbatim
e0“Under repeated drought stress, growth vigor of sugarcane plant slowed down, water potential and chlorophyll content in leaves were reduced”
Claim · model-written summary
Repeated drought increased sugarcane leaf membrane permeability and proline and malondialdehyde content.
- Taxon
- sugarcanee0
- Treatment
- repeated drought stresse0
- Outcome
- cytoplasm membrane permeability and content of proline and malondialdehyde in leavese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Under repeated drought stress, growth vigor of sugarcane plant slowed down, water potential and chlorophyll content in leaves were reduced, and cytoplasm membrane permeability and content of proline and malondialdehyde in leaves increased”
Claim · model-written summary
Growth vigor, water potential and proline content changed more at seedling than elongation stage.
- Taxon
- sugarcanee0
- Organ / stage
- seedling stagee0
- Outcome
- growth vigor, water potential, proline contente0
Not reportedDirection
Verbatim
e0“sugarcane growth vigor, water potential, proline content and peroxidase (POD) activity in sugarcane leaves changed more significantly at seedling stage”
Claim · model-written summary
Leaf peroxidase activity changed more at seedling than elongation stage.
Not reportedDirection
Verbatim
e0“peroxidase (POD) activity in sugarcane leaves changed more significantly at seedling stage”
Claim · model-written summary
Malondialdehyde, membrane permeability and soluble protein changed more at elongation stage.
- Organ / stage
- elongation stagee0
- Outcome
- malondialdehyde content, leaf cytoplasmic membrane permeability and content of soluble proteine0
Not reportedTaxonDirection
Verbatim
e0“malondialdehyde content, leaf cytoplasmic membrane permeability and content of soluble protein and chlorophyll in leaves changed more obviously at elongation stage”
Claim · model-written summary
Chlorophyll content changed more at elongation stage.
Not reportedDirection
Verbatim
e0“malondialdehyde content, leaf cytoplasmic membrane permeability and content of soluble protein and chlorophyll in leaves changed more obviously at elongation stage”
t0“drought stress on sugarcane growth”
Claim · model-written summary
GT21 had relatively higher water potential, malondialdehyde and soluble protein than other sugarcane cultivars.
Verbatim
e0“GT21 had relative higher contents of water potential, malondialdehyde, soluble protein, and chlorophyll”
t0“drought stress on sugarcane growth”
Claim · model-written summary
GT21 had relatively higher chlorophyll than other sugarcane cultivars.
Verbatim
e0“GT21 had relative higher contents of water potential, malondialdehyde, soluble protein, and chlorophyll”
t0“drought stress on sugarcane growth”
Claim · model-written summary
GT21 had lower membrane permeability, free proline and POD activity than other sugarcane cultivars.
Verbatim
e0“GT21 had relative higher contents of water potential, malondialdehyde, soluble protein, and chlorophyll and lower cytoplasm membrane permeability, free proline content, and POD activity”
t0“drought stress on sugarcane growth”
Claim · model-written summary
ROC22 had higher plant height, membrane permeability and proline content than GT21.
Verbatim
e0“ROC22 had higher plant height, the cytoplasm membrane permeability, proline content, and POD activity”
t0“drought stress on sugarcane growth”
Claim · model-written summary
ROC22 had higher POD activity than GT21.
Verbatim
e0“ROC22 had higher plant height, the cytoplasm membrane permeability, proline content, and POD activity”
t0“drought stress on sugarcane growth”
Claim · model-written summary
ROC22 had lower water potential, malondialdehyde and soluble protein than GT21.
Verbatim
e0“however it had lower water potential, malondialdehyde, and soluble protein content in leaves compared to those of GT21”
t0“drought stress on sugarcane growth”
Claim · model-written summary
Overall drought resistance ranked GT21, ROC22, then GT28.
Not reportedDirection
Verbatim
e0“The overall drought resistance of the three sugarcane cultivars were as followed: GT21 ROC22 GT28”
t0“drought stress on sugarcane growth”
Claim · model-written summary
Agronomic traits and physiological indexes differed significantly among drought stressed sugarcane varieties.
Not reportedDirection
Verbatim
e0“Agronomic traits and physiological indexes showed significant differences in different sugarcane varieties under drought stress”
Claim · model-written summary
Repeated drought at seedling and elongation stages showed no obvious consistent cumulative effects.
Verbatim
e0“no obviously consistant and accumulative effects of repeated drought stress (at seedling and elongating stages) were found”
t0“drought stress on sugarcane growth”
Claim · model-written summary
The subordinate function method evaluated cultivar drought resistance more accurately and comprehensively.
- Taxon
- sugarcanee0
- Outcome
- drought resistance of sugarcane cultivarse0
- Direction
- more accurately and comprehensivelye0
Not reportedComparatorValue
Verbatim
e0“Subordinate function method could more accurately and comprehensively evaluate the drought resistance of sugarcane cultivars”
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