Abstract
The role of proline in imparting tolerance to salinity was investigated in Hydrilla verticillata, Najas indica and Najas gramenia. The plants were exposed to different concentrations of NaCl and artificial sea water (SWS) separately. The chlorophyll (Chl) a/b ratio decreased significantly in all the three plant species in both NaCl and SWS treatments, comparatively more in former than the latter. NaCl resulted in drastic decrease in this ratio in salt sensitive H. verticillata and N. indica, but in somewhat lesser decrease in salt resistant N. gramenia. Proline content increased at both NaCl and SWS treatments, especially at the latter. However, in H. verticillata proline content at 1.5 and 2.5 % NaCl decreased. It was concluded that proline cannot be used as a biochemical marker of salt tolerance in aquatic plants, however, the decrease in Chl a/b ratio in response to NaCl may be used as an index of salt sensitivity in this ecological group of plants.
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Claims 7
Claim · model-written summary
NaCl and artificial sea water significantly decreased the chlorophyll a/b ratio in all three species, more under NaCl.
- Taxon
- Hydrilla verticillata, Najas indica and Najas grameniae1
- Treatment
- NaCl and SWS treatmentse0
- Outcome
- chlorophyll (Chl) a/b ratioe0
- Direction
- decreasede0
Not reportedComparator
Verbatim
e0“The chlorophyll (Chl) a/b ratio decreased significantly in all the three plant species in both NaCl and SWS treatments, comparatively more in former than the latter.”
e1“Hydrilla verticillata, Najas indica and Najas gramenia”
Claim · model-written summary
NaCl caused a drastic chlorophyll ratio decrease in salt sensitive H. verticillata and N. indica.
- Taxon
- H. verticillata and N. indica
Hydrilla verticillata
Najas indicae0 - Treatment
- NaCle0
- Outcome
- this ratioe0
- Direction
- decreasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“NaCl resulted in drastic decrease in this ratio in salt sensitive H. verticillata and N. indica”
Claim · model-written summary
NaCl caused a lesser chlorophyll ratio decrease in salt resistant N. gramenia.
Not reportedComparator
Verbatim
e0“but in somewhat lesser decrease in salt resistant N. gramenia.”
e1“NaCl resulted in drastic decrease in this ratio in salt sensitive H. verticillata and N. indica, but in somewhat lesser decrease in salt resistant N. gramenia.”
Claim · model-written summary
Proline content increased under NaCl and SWS, especially SWS.
- Taxon
- Hydrilla verticillata, Najas indica and Najas grameniae1
- Treatment
- NaCl and SWS treatmentse0
- Outcome
- Proline contente0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“Proline content increased at both NaCl and SWS treatments, especially at the latter.”
e1“Hydrilla verticillata, Najas indica and Najas gramenia”
Claim · model-written summary
At 1.5 and 2.5 % NaCl, H. verticillata proline content decreased.
- Taxon
- H. verticillataHydrilla verticillatae0
- Treatment
- 1.5 and 2.5 % NaCle0
- Outcome
- proline contente0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“However, in H. verticillata proline content at 1.5 and 2.5 % NaCl decreased.”
Claim · model-written summary
The authors concluded that proline is unsuitable as a biochemical marker of salt tolerance.
Verbatim
e0“proline cannot be used as a biochemical marker of salt tolerance in aquatic plants”
Claim · model-written summary
The authors proposed NaCl-associated chlorophyll ratio decrease as an index of salt sensitivity.
Verbatim
e0“the decrease in Chl a/b ratio in response to NaCl may be used as an index of salt sensitivity in this ecological group of plants.”
e1“aquatic plants”