Abstract
Drought stress poses a major challenge to sustainable agriculture, and seed priming with melatonin has shown potential to mitigate stress damage in crops. However, the effects of melatonin priming (MP) on drought tolerance in rapeseed (Brassica napus L.) remain underexplored, particularly under field conditions. In this study, two rapeseed cultivars, Shiraali and Pakola, were primed with melatonin and tested under irrigated and drought stress conditions. Results indicated significant cultivar differences for most parameters, except for plant number, peroxidase (POD), catalase (CAT), 1000-seed weight, and harvest index. MP outperformed hydro priming (HP) for most traits, except for branch number, harvest index, and seed protein content. Drought stress significantly affected all parameters, except for POD, branch number, and 1000-seed weight. Shiraali exhibited higher plant density, plant height, chlorophyll a, protein, and erucic acid content, while Pakola showed superior ascorbate peroxidase (APX) and CAT activities, chlorophyll b, carotenoids, oil content, and glucosinolates, as well as higher yield. MP enhanced antioxidant activity and pigment accumulation compared to HP. Under drought conditions, a reduction in plant pigments, yield, and protein content was observed, while oil, glucosinolates, erucic acid content, and antioxidant activities increased. Pakola outperformed Shiraali in 1000-seed weight, yield, and oil content under both irrigated and drought conditions following MP. Our results indicated that melatonin may contribute to drought tolerance through integrated physiological, biochemical, and antioxidant interactions in rapeseed.
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Claims 9
Claim · model-written summary
Cultivars differed significantly for most parameters except the listed five.
Verbatim
e0“significant cultivar differences for most parameters, except for plant number, peroxidase (POD), catalase (CAT), 1000-seed weight, and harvest index”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Melatonin priming outperformed hydro priming for most traits except the listed three.
Verbatim
e0“MP outperformed hydro priming (HP) for most traits, except for branch number, harvest index, and seed protein content”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Drought significantly affected all parameters except the listed three.
- Taxon
- rapeseedt0
- Treatment
- Drought stresse0
- Outcome
- all parameterse0
- Qualifier
- except for POD, branch number, and 1000-seed weighte0
Not reportedComparatorDirection
Verbatim
e0“Drought stress significantly affected all parameters, except for POD, branch number, and 1000-seed weight”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Shiraali had superior values for plant density, plant height, chlorophyll a, protein, and erucic acid content.
Verbatim
e0“Shiraali exhibited higher plant density, plant height, chlorophyll a, protein, and erucic acid content”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Pakola had superior values for ascorbate peroxidase (APX) and CAT activities, chlorophyll b, carotenoids, oil content, and glucosinolates, as well as higher yield.
Verbatim
e0“Pakola showed superior ascorbate peroxidase (APX) and CAT activities, chlorophyll b, carotenoids, oil content, and glucosinolates, as well as higher yield”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Melatonin priming enhanced antioxidant activity and pigment accumulation relative to hydro priming.
Verbatim
e0“MP enhanced antioxidant activity and pigment accumulation compared to HP”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Under drought, plant pigments, yield, and protein content declined.
- Taxon
- rapeseedt0
- Treatment
- drought conditionse0
- Outcome
- plant pigments, yield, and protein contente0
- Direction
- reductione0
Not reportedComparator
Verbatim
e0“Under drought conditions, a reduction in plant pigments, yield, and protein content was observed, while oil, glucosinolates, erucic acid content, and antioxidant activities increased”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
Under drought, oil, glucosinolates, erucic acid content, and antioxidant activities increased.
- Taxon
- rapeseedt0
- Treatment
- drought conditionse0
- Outcome
- oil, glucosinolates, erucic acid content, and antioxidant activitiese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Under drought conditions, a reduction in plant pigments, yield, and protein content was observed, while oil, glucosinolates, erucic acid content, and antioxidant activities increased”
t0“rapeseed (Brassica napus L.)”
Claim · model-written summary
After melatonin priming, Pakola exceeded Shiraali in seed weight, yield and oil content under both water regimes.
Verbatim
e0“Pakola outperformed Shiraali in 1000-seed weight, yield, and oil content under both irrigated and drought conditions following MP”
t0“rapeseed (Brassica napus L.)”
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