Abstract
Drought stress severely limits rapeseed (Brassica napus L.) growth and productivity by disrupting photosynthetic efficiency and inducing oxidative damage. This study investigated the potential of melatonin (MT) and methyl jasmonate (MJ), individually and in combination, to mitigate drought-induced toxicity in rapeseed. Plants were subjected to drought stress (15% Polyethylene glycol 6000), followed by foliar application of MT (100 μM), MJ (100 μM), or their combination. Under drought stress, rapeseed exhibited significantly reduced chlorophyll content (by 33.72% for chl a and 54.59% for chl b), impaired photosystem II efficiency (Fv/Fm decreased by 16.08%), and elevated oxidative stress markers (H₂O₂ increased by 54.79%, MDA by 144.6%, ROS by 43.96%). The combined application of MT and MJ conferred the highest level of drought tolerance, increasing shoot fresh weight by 92.33% and root dry weight by 405% compared to the stressed control. This synergistic treatment effectively enhanced stomatal conductance by 76.25%, increased net photosynthetic rate (Pn) by 71.45%, and boosted key antioxidant enzyme activities (e.g., POD by 216%). The enhanced efficacy of the dual treatment compared to individual applications strongly indicates coordinated signaling between MT and MJ pathways in stress response modulation. These results demonstrate that simultaneous application of these plant growth regulators offers an effective physiological strategy to improve rapeseed performance under water deficit conditions.
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Claims 14
Claim · model-written summary
Drought significantly reduced chlorophyll a by 33.72%.
Not reportedComparator
Verbatim
e0“Under drought stress, rapeseed exhibited significantly reduced chlorophyll content (by 33.72% for chl a and 54.59% for chl b)”
Claim · model-written summary
Drought significantly reduced chlorophyll b by 54.59%.
Not reportedComparator
Verbatim
e0“Under drought stress, rapeseed exhibited significantly reduced chlorophyll content (by 33.72% for chl a and 54.59% for chl b)”
Claim · model-written summary
Drought decreased Fv/Fm by 16.08%.
Not reportedComparator
Verbatim
e0“impaired photosystem II efficiency (Fv/Fm decreased by 16.08%)”
e1“Under drought stress, rapeseed exhibited”
Claim · model-written summary
Drought increased H₂O₂ by 54.79%.
Not reportedComparator
Verbatim
e0“elevated oxidative stress markers (H₂O₂ increased by 54.79%, MDA by 144.6%, ROS by 43.96%)”
e1“Under drought stress, rapeseed exhibited”
Claim · model-written summary
Drought elevated MDA by 144.6%.
Not reportedComparator
Verbatim
e0“elevated oxidative stress markers (H₂O₂ increased by 54.79%, MDA by 144.6%, ROS by 43.96%)”
e1“Under drought stress, rapeseed exhibited”
Claim · model-written summary
Drought elevated ROS by 43.96%.
Not reportedComparator
Verbatim
e0“elevated oxidative stress markers (H₂O₂ increased by 54.79%, MDA by 144.6%, ROS by 43.96%)”
e1“Under drought stress, rapeseed exhibited”
Claim · model-written summary
Combined MT and MJ increased shoot fresh weight by 92.33% relative to stressed controls.
- Taxon
- Brassica napus
_Brassica_napus_-_Habit.jpg?width=60)
Brassica napust0 - Treatment
- combined application of MT and MJe0
- Outcome
- shoot fresh weighte0
- Direction
- increasinge0
- Value
- 92.33%e0
- Comparator
- stressed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_Brassica_napus_-_Habit.jpg?width=500)
Verbatim
e0“The combined application of MT and MJ conferred the highest level of drought tolerance, increasing shoot fresh weight by 92.33% and root dry weight by 405% compared to the stressed control.”
t0“Brassica napus”
Claim · model-written summary
Combined MT and MJ increased root dry weight by 405% relative to stressed controls.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- combined application of MT and MJe0
- Outcome
- root dry weighte0
- Direction
- increasinge0
- Value
- 405%e0
- Comparator
- stressed controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined application of MT and MJ conferred the highest level of drought tolerance, increasing shoot fresh weight by 92.33% and root dry weight by 405% compared to the stressed control.”
t0“Brassica napus”
Claim · model-written summary
Combined treatment gave the highest drought tolerance.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- combined application of MT and MJe0
- Outcome
- drought tolerancee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The combined application of MT and MJ conferred the highest level of drought tolerance”
t0“Brassica napus”
Claim · model-written summary
Combined treatment enhanced stomatal conductance by 76.25%.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- synergistic treatmente0
- Outcome
- stomatal conductancee0
- Direction
- enhancede0
- Value
- 76.25%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This synergistic treatment effectively enhanced stomatal conductance by 76.25%”
t0“Brassica napus”
Claim · model-written summary
Combined treatment increased net photosynthetic rate by 71.45%.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- synergistic treatmente0
- Outcome
- net photosynthetic rate (Pn)e0
- Direction
- increasede0
- Value
- 71.45%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This synergistic treatment effectively enhanced stomatal conductance by 76.25%, increased net photosynthetic rate (Pn) by 71.45%”
t0“Brassica napus”
Claim · model-written summary
Combined treatment boosted POD activity by 216%.
- Taxon
- Brassica napusBrassica napust0
- Treatment
- synergistic treatmente0
- Outcome
- PODe0
- Direction
- boostede0
- Value
- 216%e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“This synergistic treatment effectively enhanced stomatal conductance by 76.25%, increased net photosynthetic rate (Pn) by 71.45%, and boosted key antioxidant enzyme activities (e.g., POD by 216%).”
t0“Brassica napus”
Claim · model-written summary
Greater efficacy of combined treatment suggests coordinated MT and MJ signaling in stress response.
- Taxon
- Brassica napusBrassica napust0
- Outcome
- stress response modulatione0
- Qualifier
- coordinated signaling between MT and MJ pathwayse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The enhanced efficacy of the dual treatment compared to individual applications strongly indicates coordinated signaling between MT and MJ pathways in stress response modulation.”
t0“Brassica napus”
Claim · model-written summary
Simultaneous growth regulator application is proposed as an effective strategy to improve rapeseed under water deficit.
Verbatim
e0“simultaneous application of these plant growth regulators offers an effective physiological strategy to improve rapeseed performance under water deficit conditions.”
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