Abstract
Under the influence of global climate change, it is anticipated that the incidence and extent of drought conditions will increase in numerous regions across the globe. Sphagnum palustre, a dominant species in peatlands, is instrumental in maintaining hydrological regulation and enhancing carbon sequestration. However, the mechanisms underlying its drought response remain poorly characterized at the molecular and metabolic levels. This study analyzed the response of S. palustre to drought stress through integrated physiological, transcriptomic, and metabolomic approaches. Physiological results indicated that drought reduced the relative water content, chlorophyll and soluble protein content, while increased the content of soluble sugars and malondialdehyde, and antioxidant enzyme activity. Transcriptomic profiling identified 21,145 differentially expressed genes (DEGs) under drought stress. The DEGs associated with photosynthesis were significantly down-regulated, whereas those involved in other key pathways, such as hormone signal transduction, cutin and wax biosynthesis, and phenylalanine and linoleic acid metabolism, were significantly up-regulated. A total of 3668 differentially abundant metabolites were detected, with a significant accumulation of phenylpropanoids and flavonoids. Integrated multi-omics analyses highlight that S. palustre employs osmotic adjustment to enhance antioxidant defense, triggering adaptive responses through soluble sugar accumulation, hormone signaling, phenylpropanoid and flavonoid biosynthesis, and activation of ATP-binding cassette transporters. These findings provide insights into bryophytes drought adaptation, facilitating predictions of peatland ecosystem resilience and guiding conservation strategies under climate change.
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Claims 8
Claim · model-written summary
Drought reduced relative water content, chlorophyll and soluble protein content.
- Taxon
- Sphagnum palustre
Sphagnum palustret0 - Treatment
- droughte0
- Outcome
- relative water content, chlorophyll and soluble protein contente0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“drought reduced the relative water content, chlorophyll and soluble protein content”
t0“Sphagnum palustre”
Claim · model-written summary
Drought increased soluble sugars and malondialdehyde content and antioxidant enzyme activity.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Treatment
- droughte1
- Outcome
- content of soluble sugars and malondialdehyde, and antioxidant enzyme activitye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“increased the content of soluble sugars and malondialdehyde, and antioxidant enzyme activity”
t0“Sphagnum palustre”
e1“drought reduced the relative water content, chlorophyll and soluble protein content”
Claim · model-written summary
Transcriptomic profiling identified 21,145 differentially expressed genes under drought stress.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Treatment
- drought stresse0
- Outcome
- differentially expressed genese0
- Value
- 21,145e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Transcriptomic profiling identified 21,145 differentially expressed genes (DEGs) under drought stress”
t0“Sphagnum palustre”
Claim · model-written summary
Photosynthesis-associated differentially expressed genes were significantly down-regulated.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Outcome
- DEGs associated with photosynthesise0
- Direction
- down-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The DEGs associated with photosynthesis were significantly down-regulated”
t0“Sphagnum palustre”
Claim · model-written summary
Differentially expressed genes in hormone signaling, cutin and wax biosynthesis, and phenylalanine and linoleic acid metabolism were significantly up-regulated.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Outcome
- hormone signal transduction, cutin and wax biosynthesis, and phenylalanine and linoleic acid metabolisme0
- Direction
- up-regulatede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“those involved in other key pathways, such as hormone signal transduction, cutin and wax biosynthesis, and phenylalanine and linoleic acid metabolism, were significantly up-regulated”
t0“Sphagnum palustre”
Claim · model-written summary
Metabolomic profiling detected 3668 differentially abundant metabolites.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Outcome
- differentially abundant metabolitese0
- Value
- 3668e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“A total of 3668 differentially abundant metabolites were detected”
t0“Sphagnum palustre”
Claim · model-written summary
Phenylpropanoids and flavonoids accumulated significantly.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Outcome
- accumulation of phenylpropanoids and flavonoidse0
- Direction
- accumulatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant accumulation of phenylpropanoids and flavonoids”
t0“Sphagnum palustre”
Claim · model-written summary
Integrated analyses suggest osmotic adjustment, antioxidant defense, sugar accumulation, hormone signaling, secondary metabolite biosynthesis and ABC transporters contribute to drought adaptation.
- Taxon
- Sphagnum palustreSphagnum palustret0
- Outcome
- adaptive responsese0
- Qualifier
- osmotic adjustment to enhance antioxidant defensee0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“S. palustre employs osmotic adjustment to enhance antioxidant defense, triggering adaptive responses through soluble sugar accumulation, hormone signaling, phenylpropanoid and flavonoid biosynthesis, and activation of ATP-binding cassette transporters”
t0“Sphagnum palustre”