Abstract
Abstract Waterlogging stress is a common limiting factor for winter rapeseed, which greatly affects the growth and potential production. The present study was conducted to investigate the effects of waterlogging with different durations (0day (D0), 6days (D6) and 9days (D9)) and supplemental nitrogen fertilization (N1, 0 kg ha −1 ; N2, 30 kg ha −1 ; N3, 60 kg ha −1 and N4, 90 kg ha −1 ) on the physiological characteristics, dry matter and nitrogen accumulation in winter rapeseed (Chuanyou36). The results showed that the supplementary application of nitrogen fertilizer could effectively improve the physiological indexes of winter rapeseed in both pot and field experiments. The supplemental nitrogen increased the chlorophyll content in leaves, enhanced the activities of SOD, CAT, and POD, and decreased the MDA content in leaves and roots of rapeseed. The chlorophyll contents, the antioxidant enzyme activity of leaves and roots significantly increased under D6N3 and D9N4 conditions in both (pot and field) experiments. However, MDA contents significantly decreased compared with waterlogging without nitrogen application. Moreover, the application of nitrogen fertilizer after waterlogging increased the accumulation of dry matter and nitrogen in rapeseed at different growth stages. Therefore, waterlogging stress significantly inhibited the growth and development of rapeseed, but the application of nitrogen fertilizer could effectively reduce the damage of waterlogging. The N-induced increase in waterlogging tolerance of rapeseed might be attributed to the strong antioxidant defense system, maintenance of photosynthetic pigments and the nutrient balance.
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Claims 10
Claim · model-written summary
Supplemental nitrogen increased rapeseed leaf chlorophyll.
- Taxon
- winter rapeseedt0
- Treatment
- supplemental nitrogene0
- Outcome
- chlorophyll content in leavese0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“supplemental nitrogen increased the chlorophyll content in leaves”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Supplemental nitrogen enhanced SOD, CAT and POD activities.
- Taxon
- winter rapeseedt0
- Treatment
- supplemental nitrogene0
- Outcome
- activities of SOD, CAT, and PODe0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“The supplemental nitrogen increased the chlorophyll content in leaves, enhanced the activities of SOD, CAT, and POD”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Supplemental nitrogen decreased leaf and root MDA.
- Taxon
- winter rapeseedt0
- Treatment
- supplemental nitrogene0
- Outcome
- MDA content in leaves and rootse0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“The supplemental nitrogen increased the chlorophyll content in leaves, enhanced the activities of SOD, CAT, and POD, and decreased the MDA content in leaves and roots of rapeseed”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
D6N3 and D9N4 significantly increased chlorophyll content.
- Taxon
- winter rapeseedt0
- Treatment
- D6N3 and D9N4e0
- Outcome
- chlorophyll contentse0
- Direction
- increasede0
- Setting
- pot and fielde0
Not reportedComparator
Verbatim
e0“The chlorophyll contents, the antioxidant enzyme activity of leaves and roots significantly increased under D6N3 and D9N4 conditions in both (pot and field) experiments”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
D6N3 and D9N4 significantly increased leaf and root antioxidant activity.
- Taxon
- winter rapeseedt0
- Treatment
- D6N3 and D9N4e0
- Outcome
- antioxidant enzyme activity of leaves and rootse0
- Direction
- increasede0
- Setting
- pot and fielde0
Not reportedComparator
Verbatim
e0“the antioxidant enzyme activity of leaves and roots significantly increased under D6N3 and D9N4 conditions in both (pot and field) experiments”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Supplemental nitrogen significantly decreased MDA relative to waterlogging alone.
Verbatim
e0“MDA contents significantly decreased compared with waterlogging without nitrogen application”
t0“winter rapeseed (Brassica napus L.)”
e1“supplemental nitrogen fertilization (N1”
Claim · model-written summary
Nitrogen after waterlogging increased dry matter accumulation.
- Taxon
- winter rapeseedt0
- Treatment
- application of nitrogen fertilizer after waterlogginge0
- Outcome
- accumulation of dry mattere0
- Direction
- increasede0
- Qualifier
- at different growth stagese0
Not reportedComparator
Verbatim
e0“application of nitrogen fertilizer after waterlogging increased the accumulation of dry matter and nitrogen in rapeseed at different growth stages”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Nitrogen after waterlogging increased nitrogen accumulation.
- Taxon
- winter rapeseedt0
- Treatment
- application of nitrogen fertilizer after waterlogginge0
- Outcome
- nitrogen in rapeseede0
- Direction
- increasede0
- Qualifier
- at different growth stagese0
Not reportedComparator
Verbatim
e0“application of nitrogen fertilizer after waterlogging increased the accumulation of dry matter and nitrogen in rapeseed at different growth stages”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Waterlogging significantly inhibited rapeseed growth and development.
- Taxon
- winter rapeseedt0
- Treatment
- waterlogging stresse0
- Outcome
- growth and developmente0
- Direction
- inhibitede0
Not reportedComparator
Verbatim
e0“waterlogging stress significantly inhibited the growth and development of rapeseed”
t0“winter rapeseed (Brassica napus L.)”
Claim · model-written summary
Nitrogen fertilizer reduced waterlogging damage in rapeseed.
- Taxon
- winter rapeseedt0
- Treatment
- application of nitrogen fertilizere0
- Outcome
- damage of waterlogginge0
- Direction
- reducee0
Not reportedComparator
Verbatim
e0“application of nitrogen fertilizer could effectively reduce the damage of waterlogging”
t0“winter rapeseed (Brassica napus L.)”
e1“growth and development of rapeseed”
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