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Analysis of Effect of Compound Salt Stress on Seed Germination and Salt Tolerance Analysis of Pepper Capsicum annuum L.
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Some rootstocks improve pepper tolerance to mild salinity through ionic regulation.

Consuelo Penella1, Sergio G Nebauer2, Ana Quiñones1

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Plant Science : an International Journal of Experimental Plant Biology
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Grafting pepper with specific rootstocks enhances salt tolerance by improving ion selectivity and reducing negative impacts on photosynthesis. This strategy shows promise for improving crop yield in saline conditions.

Keywords:
GraftIonsNaClPepperPhotosynthesisYield, water relations

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Area of Science:

  • Horticulture
  • Plant Physiology
  • Agricultural Science

Background:

  • Salinity is a major abiotic stress limiting crop productivity worldwide.
  • Grafting is a technique explored to improve crop performance under stress conditions, including salinity.
  • Previous studies indicated variable responses of pepper cultivars when grafted onto different rootstocks under salinity.

Purpose of the Study:

  • To investigate the effectiveness of different pepper rootstocks in conferring salt tolerance to the commercial 'Adige' cultivar.
  • To elucidate the physiological and biochemical mechanisms underlying salt tolerance in grafted pepper plants.
  • To assess the impact of salinity on yield and physiological parameters in various grafted pepper combinations.

Main Methods:

  • Pepper plants (cv. 'Adige') were grafted onto different Capsicum accessions (ECU-973, BOL-58, Serrano).
  • Grafted plants were subjected to salinity stress (40 mM NaCl) for 30 days.
  • Evaluated parameters included water relations, mineral content (Na+, K+), proline accumulation, photosynthesis, nitrate reductase activity, and lipid peroxidation.

Main Results:

  • Grafting 'Adige' onto ECU-973 (Capsicum chinense) significantly increased salt tolerance and fruit yield compared to non-grafted plants.
  • The tolerant rootstock (ECU-973) reduced Na+ and Cl- accumulation in the scion and maintained Na+/K+ discrimination.
  • Physiological impacts such as reduced photosynthesis and nitrate reductase activity were minimized in scions grafted onto tolerant rootstocks.

Conclusions:

  • Tolerant pepper rootstocks, particularly Capsicum chinense accession ECU-973, can effectively improve salinity tolerance in commercial cultivars like 'Adige'.
  • Maintaining ion homeostasis and selectivity in the scion is a key mechanism for conferring salt tolerance through grafting.
  • Grafting with suitable rootstocks is a viable strategy to mitigate salinity stress and enhance pepper crop yield.