Abstract
Abstract Background Water deficiency is likely to become more frequent and intense as a result of global climate change, which may severely impact agricultural production in the world. The positive effects of melatonin (MEL) on alleviation drought or osmotic stress-induced water deficiency in plants has been well reported. However, the underlying mechanism of MEL on the detailed process of plant water uptake and transport under water deficiency condition remains largely unknown. Results Application of 1 μM MEL led to enhanced tolerance to water deficiency stress in maize seedlings, as evidenced by maintaining the higher photosynthetic parameters, leaf water status and plant transpiration rate. The relatively higher whole-plant hydraulic conductance (K plant ) and root hydraulic conductance (Lp r ) in MEL-treated seedlings suggest that exogenous MEL alleviated water deficiency stress by promoting root water absorption. HgCl 2 (aquaporin inhibitor) treatment inhibit the transpiration rate in MEL-treated plants greater than those of MEL-untreated; after recovery by dithiothreitol (DTT, anti-inhibitor), the transpiration rate in MEL-treated plants increased much higher than those of untreated plants. Moreover, under water deficiency, the transcription level of aquaporin genes was up-regulated by MEL application, and the H 2 O 2 was less accumulated in MEL-treated root. Conclusions Exogenous MEL promoted aquaporin activity, which contributed to the maintaining of Lp r and K plant under short-term water deficiency. The increased water uptake and transport lead to improved water status and thus increased tolerance to PEG-induced short-term water deficiency in maize seedlings.
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Claims 6
Claim · model-written summary
Melatonin improved photosynthetic parameters, leaf water status and transpiration under water deficiency.
- Treatment
- 1 μM MELe0
- Outcome
- photosynthetic parameters, leaf water status and plant transpiration ratee0
- Direction
- highere0
Zea maysNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Application of 1 μM MEL led to enhanced tolerance to water deficiency stress in maize seedlings, as evidenced by maintaining the higher photosynthetic parameters, leaf water status and plant transpiration rate”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
Claim · model-written summary
MEL treated seedlings had higher whole plant and root hydraulic conductance.
- Treatment
- MEL-treatede0
- Outcome
- whole-plant hydraulic conductance (K plant ) and root hydraulic conductance (Lp r )e0
- Direction
- highere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The relatively higher whole-plant hydraulic conductance (K plant ) and root hydraulic conductance (Lp r ) in MEL-treated seedlings”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
Claim · model-written summary
Aquaporin inhibition suppressed transpiration more in MEL treated than untreated plants.
- Treatment
- HgCl 2 (aquaporin inhibitor) treatmente0
- Outcome
- transpiration ratee0
- Direction
- inhibite0
- Comparator
- MEL-untreatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“HgCl 2 (aquaporin inhibitor) treatment inhibit the transpiration rate in MEL-treated plants greater than those of MEL-untreated”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
Claim · model-written summary
After DTT recovery, transpiration rose more in MEL treated than untreated plants.
- Treatment
- dithiothreitol (DTT, anti-inhibitor)e0
- Outcome
- transpiration ratee0
- Direction
- increasede0
- Comparator
- untreated plantse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“after recovery by dithiothreitol (DTT, anti-inhibitor), the transpiration rate in MEL-treated plants increased much higher than those of untreated plants”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
Claim · model-written summary
MEL upregulated aquaporin gene transcription under water deficiency.
- Treatment
- MEL applicatione0
- Gene
- aquaporin genese0
- Outcome
- transcription level of aquaporin genese0
- Direction
- up-regulatede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under water deficiency, the transcription level of aquaporin genes was up-regulated by MEL application”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
Claim · model-written summary
MEL reduced root hydrogen peroxide accumulation under water deficiency.
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the H 2 O 2 was less accumulated in MEL-treated root”
t0“Exogenous melatonin alleviates PEG-induced short-term water deficiency in maize by increasing hydraulic conductance”
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