Abstract
Salinity stress is a major constraint to sustainable crop production due to its adverse impact on crop growth, physiology, and productivity. As potato is the fourth most important staple food crop, enhancing its productivity is necessary to ensure food security for the ever-increasing population. Identification and cultivation of salt-tolerant potato genotypes are imperative mitigating strategies to cope with stress conditions. For this purpose, fifty-three varieties of potato were screened under control and salt stress conditions for growth and yield-related traits during 2020. Salt stress caused a mean reduction of 14.49%, 8.88%, and 38.75% in plant height, stem numbers, and tuber yield, respectively in comparison to control. Based on percent yield reduction, the genotypes were classified as salt-tolerant (seven genotypes), moderately tolerant (thirty-seven genotypes), and salt-sensitive genotypes (nine genotypes). Seven salt-tolerant and nine salt-sensitive genotypes were further evaluated to study their responses to salinity on targeted physiological, biochemical, and ionic traits during 2021. Salt stress significantly reduced the relative water content (RWC), membrane stability index (MSI), photosynthesis rate (Pn), transpiration rate (E), stomatal conductance, and K+/Na+ ratio in all the sixteen genotypes; however, this reduction was more pronounced in salt-sensitive genotypes compared to salt-tolerant ones. The better performance of salt-tolerant genotypes under salt stress was due to the strong antioxidant defense system as evidenced by greater activity of super oxide dismutase (SOD), peroxidase (POX), catalase (CAT), and ascorbate peroxidase (APX) and better osmotic adjustment (accumulation of proline). The stepwise regression approach identified plant height, stem numbers, relative water content, proline content, H2O2, POX, tuber K+/Na+, and membrane stability index as predominant traits for tuber yield, suggesting their significant role in alleviating salt stress. The identified salt-tolerant genotypes could be used in hybridization programs for the development of new high-yielding and salt-tolerant breeding lines. Further, these genotypes can be used to understand the genetic and molecular mechanism of salt tolerance in potato.
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Claims 9
Claim · model-written summary
Salt stress reduced plant height by 14.49%.
- Taxon
- Potato
Solanum tuberosumt0 - Treatment
- Salt stresse0
- Outcome
- plant heighte0
- Direction
- reductione0
- Value
- 14.49%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress caused a mean reduction of 14.49%, 8.88%, and 38.75% in plant height, stem numbers, and tuber yield, respectively in comparison to control.”
t0“Potato Cultivars”
Claim · model-written summary
Salt stress reduced stem numbers by 8.88%.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Salt stresse0
- Outcome
- stem numberse0
- Direction
- reductione0
- Value
- 8.88%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress caused a mean reduction of 14.49%, 8.88%, and 38.75% in plant height, stem numbers, and tuber yield, respectively in comparison to control.”
t0“Potato Cultivars”
Claim · model-written summary
Salt stress reduced tuber yield by 38.75%.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Salt stresse0
- Outcome
- tuber yielde0
- Direction
- reductione0
- Value
- 38.75%e0
- Comparator
- controle0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress caused a mean reduction of 14.49%, 8.88%, and 38.75% in plant height, stem numbers, and tuber yield, respectively in comparison to control.”
t0“Potato Cultivars”
Claim · model-written summary
Yield reduction classified seven genotypes as salt tolerant, 37 as moderately tolerant, and nine as salt sensitive.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- genotypes were classified as salt-tolerant (seven genotypes), moderately tolerant (thirty-seven genotypes), and salt-sensitive genotypes (nine genotypes)e0
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Based on percent yield reduction, the genotypes were classified as salt-tolerant (seven genotypes), moderately tolerant (thirty-seven genotypes), and salt-sensitive genotypes (nine genotypes).”
t0“Potato Cultivars”
Claim · model-written summary
Salt stress significantly reduced relative water content, membrane stability, and photosynthesis rate in all sixteen genotypes, more in salt sensitive genotypes.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Salt stresse0
- Outcome
- relative water content (RWC), membrane stability index (MSI), photosynthesis rate (Pn)e0
- Direction
- reducede0
- Comparator
- salt-tolerant onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress significantly reduced the relative water content (RWC), membrane stability index (MSI), photosynthesis rate (Pn), transpiration rate (E), stomatal conductance, and K+/Na+ ratio in all the sixteen genotypes; however, this reduction was more pronounced in salt-sensitive genotypes compared to salt-tolerant ones.”
t0“Potato Cultivars”
Claim · model-written summary
Salt stress significantly reduced transpiration, stomatal conductance, and K+/Na+ ratio in all sixteen genotypes, more in salt sensitive genotypes.
- Taxon
- PotatoSolanum tuberosumt0
- Treatment
- Salt stresse0
- Outcome
- transpiration rate (E), stomatal conductance, and K+/Na+ ratioe0
- Direction
- reducede0
- Comparator
- salt-tolerant onese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Salt stress significantly reduced the relative water content (RWC), membrane stability index (MSI), photosynthesis rate (Pn), transpiration rate (E), stomatal conductance, and K+/Na+ ratio in all the sixteen genotypes; however, this reduction was more pronounced in salt-sensitive genotypes compared to salt-tolerant ones.”
t0“Potato Cultivars”
Claim · model-written summary
Salt tolerant genotypes showed greater antioxidant enzyme activities and proline accumulation.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- greater activity of super oxide dismutase (SOD), peroxidase (POX), catalase (CAT), and ascorbate peroxidase (APX) and better osmotic adjustment (accumulation of proline)e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“greater activity of super oxide dismutase (SOD), peroxidase (POX), catalase (CAT), and ascorbate peroxidase (APX) and better osmotic adjustment (accumulation of proline)”
t0“Potato Cultivars”
Claim · model-written summary
Stepwise regression identified eight predominant traits for tuber yield.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- predominant traits for tuber yielde0
- Value
- plant height, stem numbers, relative water content, proline content, H2O2, POX, tuber K+/Na+, and membrane stability indexe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The stepwise regression approach identified plant height, stem numbers, relative water content, proline content, H2O2, POX, tuber K+/Na+, and membrane stability index as predominant traits for tuber yield”
t0“Potato Cultivars”
Claim · model-written summary
The identified salt tolerant genotypes could be used in hybridization for high yielding salt tolerant lines.
- Taxon
- PotatoSolanum tuberosumt0
- Outcome
- hybridization programs for the development of new high-yielding and salt-tolerant breeding linese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The identified salt-tolerant genotypes could be used in hybridization programs for the development of new high-yielding and salt-tolerant breeding lines.”
t0“Potato Cultivars”
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