Abstract
Although some plant responses to salinity have been characterized, the precise mechanisms by which salt stress damages plants are still poorly understood especially in woody plants. In the present study, the physiological and biochemical responses of Broussonetia papyrifera, a tree species of the family, Moraceae, to salinity were studied. In vitro-produced plantlets of B. papyrifera were treated with varying levels of NaCl (0, 50, 100 and 150 mM) in hydroponic culture. Changes in ion contents, accumulation of H2O2, as well as the activities and isoform profiles of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) in the leaves, stems and roots were investigated. Under salt stress, there was higher Na+ accumulation in roots than in stems and leaves, and Ca2 +, Mg2 + and P3 + content, as well as K+/Na+ ratio were affected. NaCl treatment induced an increase in H2O2 contents in the tissues of B. papyrifera. The work demonstrated that activities of antioxidant defense enzymes changed in parallel with the increased H2O2 and salinity appeared to be associated with differential regulation of distinct SOD and POD isoenzymes. Moreover, SDS-PAGE analysis of total proteins extracted from leaves and roots of control and NaCl-treated plantlets revealed that in the leaves salt stress was associated with decrease or disappearance of some protein bands, and induction of a new protein band after exposure to 100 and 150 mM NaCl. In contrast, NaCl stress had little effect on the protein pattern in the roots. In summary, these findings may provide insight into the mechanisms of the response of woody plants to salt stress.
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Claims 8
Claim · model-written summary
Under salt stress, sodium accumulated more in roots than stems and leaves.
- Taxon
- Broussonetia papyrifera
Broussonetia papyriferat0 - Organ / stage
- rootse0
- Treatment
- salt stresse0
- Outcome
- Na+ accumulatione0
- Direction
- highere0
- Comparator
- stems and leavese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt stress, there was higher Na+ accumulation in roots than in stems and leaves”
t0“Broussonetia papyrifera”
Claim · model-written summary
Salt stress affected Ca2 +, Mg2 + and P3 + content and the K+/Na+ ratio.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Treatment
- salt stresse0
- Outcome
- Ca2 +, Mg2 + and P3 + content, as well as K+/Na+ ratioe0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Under salt stress, there was higher Na+ accumulation in roots than in stems and leaves, and Ca2 +, Mg2 + and P3 + content, as well as K+/Na+ ratio were affected.”
t0“Broussonetia papyrifera”
Claim · model-written summary
NaCl treatment increased H2O2 content in tissues.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Treatment
- NaCl treatmente0
- Outcome
- H2O2 contentse0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl treatment induced an increase in H2O2 contents in the tissues of B. papyrifera.”
t0“Broussonetia papyrifera”
Claim · model-written summary
Antioxidant enzyme activities changed alongside increased H2O2.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Compound
- H2O2e0
- Outcome
- activities of antioxidant defense enzymese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“activities of antioxidant defense enzymes changed in parallel with the increased H2O2”
t0“Broussonetia papyrifera”
Claim · model-written summary
Salinity was associated with differential regulation of SOD and POD isoenzymes.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Treatment
- salinitye0
- Gene
- SOD and POD isoenzymese0
- Outcome
- differential regulation of distinct SOD and POD isoenzymese0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salinity appeared to be associated with differential regulation of distinct SOD and POD isoenzymes.”
t0“Broussonetia papyrifera”
Claim · model-written summary
Leaf salt stress decreased or eliminated some protein bands.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Organ / stage
- leavese0
- Treatment
- salt stresse0
- Outcome
- some protein bandse0
- Direction
- decrease or disappearancee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“in the leaves salt stress was associated with decrease or disappearance of some protein bands”
t0“Broussonetia papyrifera”
Claim · model-written summary
Leaf salt stress induced a new protein band after 100 and 150 mM NaCl.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Treatment
- 100 and 150 mM NaCle0
- Outcome
- new protein bande0
- Direction
- inductione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“induction of a new protein band after exposure to 100 and 150 mM NaCl”
t0“Broussonetia papyrifera”
Claim · model-written summary
NaCl stress had little effect on root protein patterns.
- Taxon
- Broussonetia papyriferaBroussonetia papyriferat0
- Organ / stage
- rootse0
- Treatment
- NaCl stresse0
- Outcome
- protein patterne0
- Direction
- little effecte0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl stress had little effect on the protein pattern in the roots.”
t0“Broussonetia papyrifera”
The same questions in other papers
sodium chloride · quality: protein · Broussonetia papyrifera (paper mulberry)Results agree
1 paper in the same direction as this paper
- negative
salinity · quality: protein · Broussonetia papyrifera (paper mulberry)Results agree
1 paper in the same direction as this paper
- negative
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.