Abstract
Salinity reduces the uptake of manganese (Mn) and induces its deficiency, which adversely affects photosynthesis-related photosystem-II activity, hence growth is hampered. The objective of the study was to investigate the effects of Mn application on the photosystem-II activity on the isolated thylakoid membranes of the rice. A hydroponic study was carried out in the glasshouse of National Agriculture Research Centre, Islamabad, Pakistan on two rice varieties, Pakhal and KS-282, using three replicates. Three salt concentrations, namely 0, 25, 50 mM NaCl were used. Manganese sulphate was used for foliar and root application with four concentrations (0, 2, 4, 8 g Mn mL -1 ). Salinity decreased the concentration of Mn, while the application of Mn, increased the contents of Mn in shoot and root. Increased salt concentration caused a decrease in the chlorophyll contents while Mn application increased chlorophyll contents across all the salinity levels, with maximum increase at 2 g Mn mL -1 . Photosystem-II activity was inhibited by increasing salt concentration, while Mn treatment rescued this inhibitory affect, with maximum photosystem-II activity recovery at 2 g Mn mL -1 level in both varieties. Quite high concentration of Mn was observed in root application methods as compared to foliar but it failed to recover salinity impact on photosystem-II and photosynthesis. Applying Mn as foliar increased tolerance to salinity at 50 mM NaCl level while root application was found better at 25 mM NaCl concentration in culture solution.
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Claims 10
Claim · model-written summary
Salinity decreased manganese concentration.
- Taxon
- Rice
Oryza sativat0 - Treatment
- Salinitye0
- Outcome
- concentration of Mne0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salinity decreased the concentration of Mn”
t0“Rice”
Claim · model-written summary
Manganese application increased shoot and root manganese content.
- Taxon
- RiceOryza sativat0
- Organ / stage
- shoot and roote0
- Treatment
- application of Mne0
- Outcome
- contents of Mn in shoot and roote0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the application of Mn, increased the contents of Mn in shoot and root”
t0“Rice”
Claim · model-written summary
Higher salinity decreased chlorophyll content.
- Taxon
- RiceOryza sativat0
- Treatment
- Increased salt concentratione0
- Outcome
- chlorophyll contentse0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Increased salt concentration caused a decrease in the chlorophyll contents”
t0“Rice”
Claim · model-written summary
Manganese application increased chlorophyll content across salinity levels, maximally at 2 g Mn mL -1.
- Taxon
- RiceOryza sativat0
- Treatment
- Mn applicatione0
- Outcome
- chlorophyll contentse0
- Direction
- increasede0
- Value
- 2 g Mn mL -1e0
- Qualifier
- across all the salinity levelse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn application increased chlorophyll contents across all the salinity levels, with maximum increase at 2 g Mn mL -1”
t0“Rice”
Claim · model-written summary
Increasing salt inhibited photosystem II activity.
- Taxon
- RiceOryza sativat0
- Treatment
- increasing salt concentratione0
- Outcome
- Photosystem-II activitye0
- Direction
- inhibitede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Photosystem-II activity was inhibited by increasing salt concentration”
t0“Rice”
Claim · model-written summary
Manganese treatment restored photosystem II activity, with maximal recovery at 2 g Mn mL -1.
- Taxon
- RiceOryza sativat0
- Treatment
- Mn treatmente0
- Outcome
- photosystem-II activity recoverye0
- Direction
- maximume0
- Value
- 2 g Mn mL -1e0
- Qualifier
- both varietiese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Mn treatment rescued this inhibitory affect, with maximum photosystem-II activity recovery at 2 g Mn mL -1 level in both varieties”
t0“Rice”
Claim · model-written summary
Root application produced higher manganese concentration than foliar application.
- Taxon
- RiceOryza sativat0
- Treatment
- root application methodse0
- Outcome
- concentration of Mne0
- Direction
- highe0
- Comparator
- foliare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Quite high concentration of Mn was observed in root application methods as compared to foliar”
t0“Rice”
Claim · model-written summary
Root manganese application failed to recover salinity effects on photosystem II and photosynthesis.
- Taxon
- RiceOryza sativat0
- Treatment
- root application methodse0
- Outcome
- photosystem-II and photosynthesise0
- Direction
- failed to recovere0
- Comparator
- foliare0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root application methods as compared to foliar but it failed to recover salinity impact on photosystem-II and photosynthesis”
t0“Rice”
Claim · model-written summary
Foliar manganese increased salinity tolerance at 50 mM NaCl.
- Taxon
- RiceOryza sativat0
- Treatment
- Applying Mn as foliare0
- Outcome
- tolerance to salinitye0
- Direction
- increasede0
- Qualifier
- 50 mM NaCl levele0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Applying Mn as foliar increased tolerance to salinity at 50 mM NaCl level”
t0“Rice”
Claim · model-written summary
Root application was better at 25 mM NaCl.
- Taxon
- RiceOryza sativat0
- Treatment
- root applicatione0
- Outcome
- bettere0
- Direction
- bettere0
- Qualifier
- 25 mM NaCl concentratione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“root application was found better at 25 mM NaCl concentration in culture solution”
t0“Rice”
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