Abstract
Waterlogging is a major abiotic factor in tropics and subtropics India affecting plant productivity by creating anoxia, aerial rooting, mineral deficiency and toxicity, physiological and biochemical alterations. In present study, an effort was made to evaluate changes in photosynthetic pigments, chlorophyll a (Chl a), chlorophyll b (Chl b), total Chl (Chl a+Chl b), carotenoids (CAR), the ratio of Chl a and Chl b (Chl a/b) and total Chl/CAR ratio and Soil plant analysis development (SPAD) index in plants grown under waterlogged conditions (WL) along with untreated control (C) using four sugarcane cultivars; CoLk 94184, BO 91, CoS 767 and CoJ 64. The results obtained indicated variation in Chl a, b, total Chl contents (mg/g fresh wt.) among different cultivars and relatively less in waterlogged plants. Chl ranged between 1.277-2.300 (mean: 1.949 in control) and 1.057- 2.150 (mean: 1.716 in waterlogged), Chl b, 0.319- 0.607 (mean: 0.518) in control and 0.290- 0.571 (mean: 0.453) in waterlogged plants, respectively. Chl a/b ratio is slightly higher in waterlogged (3.640-3.957, mean: 3.794) as compared to control (3.610-3.997, mean: 3.789) plants except in CoJ 64, while total Chl/ CAR ratio was comparatively lesser in waterlogged plants as compared to untreated control. SPAD index was relatively higher in control (30.1 - 35.3, mean: 34.0) than waterlogged plants (22.4-34.1, mean: 29.6) similar to destructive analysis of chlorophyll contents. Carotenoids contents ranged from 0.477- 0.787 in control and 0.467-0.797 mg/g fresh wt in waterlogging treatment; BO91 and CoS767 cultivars showed slightly higher value in waterlogged. Correlation among different attributes indicated significant positive relationship except chlorophyll a/b ratio showing negative association. Cultivar CoJ 64 showed highest decrease in Chl a/b, total Chl/CAR ratio and CAR contents reflecting highly sensitive to waterlogging stress as compared to other cultivars studied.
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Claims 9
Claim · model-written summary
Waterlogged sugarcane had lower chlorophyll a and b and total chlorophyll than controls.
- Taxon
- sugarcanet0
- Treatment
- waterloggede0
- Outcome
- Chl a, b, total Chl contentse0
- Direction
- relatively lesse0
Not reportedComparator
Verbatim
e0“The results obtained indicated variation in Chl a, b, total Chl contents (mg/g fresh wt.) among different cultivars and relatively less in waterlogged plants.”
t0“SUGARCANE”
Claim · model-written summary
Chlorophyll a/b ratio was slightly higher under waterlogging except in CoJ 64.
Verbatim
e0“Chl a/b ratio is slightly higher in waterlogged (3.640-3.957, mean: 3.794) as compared to control (3.610-3.997, mean: 3.789) plants except in CoJ 64”
t0“SUGARCANE”
Claim · model-written summary
The total chlorophyll/carotenoid ratio was lower in waterlogged plants.
Verbatim
e0“total Chl/ CAR ratio was comparatively lesser in waterlogged plants as compared to untreated control”
t0“SUGARCANE”
Claim · model-written summary
SPAD index was lower in waterlogged sugarcane than controls.
Verbatim
e0“SPAD index was relatively higher in control (30.1 - 35.3, mean: 34.0) than waterlogged plants (22.4-34.1, mean: 29.6)”
t0“SUGARCANE”
Claim · model-written summary
BO91 had slightly higher carotenoid content under waterlogging.
Not reportedComparator
Verbatim
e0“BO91 and CoS767 cultivars showed slightly higher value in waterlogged”
t0“SUGARCANE”
Claim · model-written summary
CoS767 had slightly higher carotenoid content under waterlogging.
Not reportedComparator
Verbatim
e0“BO91 and CoS767 cultivars showed slightly higher value in waterlogged”
t0“SUGARCANE”
Claim · model-written summary
The measured attributes were significantly positively correlated except chlorophyll a/b ratio.
- Taxon
- SUGARCANEt0
- Outcome
- different attributese0
- Direction
- positive relationshipe0
- Qualifier
- except chlorophyll a/b ratio showing negative associatione0
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Verbatim
e0“Correlation among different attributes indicated significant positive relationship except chlorophyll a/b ratio showing negative association.”
t0“SUGARCANE”
Claim · model-written summary
Chlorophyll a/b ratio showed a negative association with other attributes.
Not reportedMaterialGeneCompoundOrgan / stageInteractorTreatmentComparatorSetting
Verbatim
e0“except chlorophyll a/b ratio showing negative association”
t0“SUGARCANE”
Claim · model-written summary
CoJ 64 showed the greatest decrease in chlorophyll a/b ratio, chlorophyll/carotenoid ratio, and carotenoid content.
Verbatim
e0“Cultivar CoJ 64 showed highest decrease in Chl a/b, total Chl/CAR ratio and CAR contents reflecting highly sensitive to waterlogging stress as compared to other cultivars studied.”
t0“SUGARCANE”
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