Abstract
The effect of ethephon under drought conditions in improving the tolerance in sugarcane was studied using the variety CoLk 94184 at early growth stage. Single bud setts were first soaked overnight in graded levels of ethephon viz., 100 ppm, 200 ppm and 400 ppm solutions, planted under tray culture conditions and maintained under net house conditions. Drought condition was created by withholding water supply in the treatments, D1 (drought), D2 (drought + 100 ppm ethephon), D3 (drought + 200 ppm ethephon) and D4 (drought + 400 ppm ethephon). An untreated control (C) was maintained with adequate water supply. After 25 days of planting, bud sprouting and growth parameters were recorded. Results obtained indicated higher bud sprouting, plant vigor, root numbers, length and weight in drought + ethephon treatments (D2 to D4) as compared to drought alone (D1). Biochemical studies revealed increasing levels of reducing, total and non-reducing sugars, proline content in bud tissues in D1 (drought) treatment. Further, these attributes were relatively higher in drought + ethephon treatments. Sprouted bud tissues used for gene expression analysis indicated increased superoxide dismutase (SOD) gene expression in almost all the treatments (D1 to D4) as compared to the control plant, with the highest recorded in D3 treatment (drought + 200 ppm ethephon). Similarly, the expression of ethylene responsive (ETR) gene was higher in drought and drought + ethephon treatments and lowest in the control (C). A house keeping actin gene was used as internal control in expression study. Findings suggested beneficial effect of setts priming with ethephon on drought tolerance. Ethephon at 100 ppm and 200 ppm was found to be effective doses for pre-planting treatment.
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Claims 8
Claim · model-written summary
Ethephon under drought increased bud sprouting and plant vigor relative to drought alone.
Verbatim
e0“higher bud sprouting, plant vigor, root numbers, length and weight in drought + ethephon treatments (D2 to D4) as compared to drought alone (D1)”
t0“sugarcane”
Claim · model-written summary
Ethephon under drought increased root numbers, length and weight relative to drought alone.
Verbatim
e0“higher bud sprouting, plant vigor, root numbers, length and weight in drought + ethephon treatments (D2 to D4) as compared to drought alone (D1)”
t0“sugarcane”
Claim · model-written summary
Drought increased reducing, total and non-reducing sugars in bud tissue.
- Taxon
- sugarcanet0
- Organ / stage
- bud tissuese0
- Treatment
- D1 (drought) treatmente0
- Outcome
- reducing, total and non-reducing sugarse0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“increasing levels of reducing, total and non-reducing sugars, proline content in bud tissues in D1 (drought) treatment”
t0“sugarcane”
Claim · model-written summary
Drought increased proline content in bud tissue.
- Taxon
- sugarcanet0
- Organ / stage
- bud tissuese0
- Treatment
- D1 (drought) treatmente0
- Outcome
- proline contente0
- Direction
- increasinge0
Not reportedComparator
Verbatim
e0“increasing levels of reducing, total and non-reducing sugars, proline content in bud tissues in D1 (drought) treatment”
t0“sugarcane”
Claim · model-written summary
Ethephon with drought further increased bud sugar and proline attributes relative to drought alone.
- Taxon
- sugarcanet0
- Treatment
- drought + ethephon treatmentse0
- Outcome
- these attributese0
- Direction
- relatively highere0
Not reportedComparator
Verbatim
e0“Further, these attributes were relatively higher in drought + ethephon treatments.”
t0“sugarcane”
Claim · model-written summary
SOD expression increased in drought and ethephon treatments versus control, with the highest expression at drought plus 200 ppm ethephon.
Verbatim
e0“increased superoxide dismutase (SOD) gene expression in almost all the treatments (D1 to D4) as compared to the control plant, with the highest recorded in D3 treatment (drought + 200 ppm ethephon)”
t0“sugarcane”
Claim · model-written summary
ETR expression was higher under drought and drought plus ethephon than in the control.
Verbatim
e0“expression of ethylene responsive (ETR) gene was higher in drought and drought + ethephon treatments and lowest in the control (C)”
t0“sugarcane”
Claim · model-written summary
The authors identified 100 ppm and 200 ppm ethephon as effective preplanting doses.
Verbatim
e0“Ethephon at 100 ppm and 200 ppm was found to be effective doses for pre-planting treatment.”
t0“sugarcane”
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