Abstract
Sphaerophysa kotschyana Boiss. is naturally distributed in overly salty regions. The key to the completion of the life cycles of S. kotschyana in harsh saline soils may be hidden in changes of its osmo-protectants, but there is currently no information about the interaction between osmotic adjustment and water relations in adaptation to saline conditions. The aim of this article was to determine growth, relative growth rate (RGR), relative water content (RWC), osmotic potential (Ψ Π ), photosynthetic efficiency (F v /F m ), thiobarbituric acid-reactive substances (TBARS) and osmo-protectant contents [proline (Pro), choline (Cho) and glycine betaine (GB)] in S. kotschyana leaves and roots exposed to 0, 150 or 300 mM NaCl for 7 and 14 d (days). The results clearly showed that the reductions in growth, RWC, F v /F m , RGR and Ψ Π were more pronounced at 300 mM, especially after 14 d. In the same group, the highest increase in TBARS was recorded in roots (126%) and leaves (31%). The induction at 150 mM was not as high. Therefore, roots appear to be the most vulnerable part of this plant. Moreover, S. kotschyana was able to withstand short-term low salinity. The osmo-protectant accumulation in S. kotschyana as a salinity acclimation or adaptation was sufficient for toleration of low salt concentration (150 mM). In contrast, the plants exposed to the highest NaCl concentration (300 mM) were not able to maintain the ability to prevent water loss because of further decrease in root/shoot ratio of fresh weight (FW) and dry weight (DW), RWC and RGR.
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Claims 7
Claim · model-written summary
At 300 mM NaCl, growth, water status, photosynthetic efficiency and relative growth rate declined most after 14 days.
- Treatment
- 300 mMe0
- Outcome
- growth, RWC, F v /F m , RGR and Ψ Πe0
- Direction
- reductionse0
- Qualifier
- after 14 de0
Not reportedTaxonComparator
Verbatim
e0“the reductions in growth, RWC, F v /F m , RGR and Ψ Π were more pronounced at 300 mM, especially after 14 d”
Claim · model-written summary
Root TBARS rose 126% in the high-salinity group.
Not reportedTaxon
Verbatim
e0“the highest increase in TBARS was recorded in roots (126%) and leaves (31%)”
Claim · model-written summary
Leaf TBARS rose 31% in the high-salinity group.
Not reportedTaxon
Verbatim
e0“the highest increase in TBARS was recorded in roots (126%) and leaves (31%)”
Claim · model-written summary
Induction at 150 mM was lower than at 300 mM.
Not reportedTaxon
Verbatim
e0“The induction at 150 mM was not as high”
Claim · model-written summary
Plants tolerated short-term low salinity.
- Taxon
- S. kotschyanaSphaerophysa kotschyanae0
- Outcome
- withstand short-term low salinitye0
Verbatim
e0“S. kotschyana was able to withstand short-term low salinity”
Claim · model-written summary
Osmoprotectant accumulation supported tolerance at 150 mM.
- Taxon
- S. kotschyanaSphaerophysa kotschyanae0
- Outcome
- toleration of low salt concentration (150 mM)e0
- Qualifier
- osmo-protectant accumulatione0
Verbatim
e0“The osmo-protectant accumulation in S. kotschyana as a salinity acclimation or adaptation was sufficient for toleration of low salt concentration (150 mM)”
Claim · model-written summary
At 300 mM, plants could not prevent water loss, with lower root-shoot weight ratio, RWC and RGR.
- Treatment
- 300 mMe0
- Outcome
- prevent water losse0
- Qualifier
- further decrease in root/shoot ratio of fresh weight (FW) and dry weight (DW), RWC and RGRe0
Not reportedTaxon
Verbatim
e0“the plants exposed to the highest NaCl concentration (300 mM) were not able to maintain the ability to prevent water loss because of further decrease in root/shoot ratio of fresh weight (FW) and dry weight (DW), RWC and RGR”