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Horticulture, Environment, and Biotechnology

, Volume 59, Issue 4, pp 491–498 | Cite as

Physiological responses of potted Dendrobium orchid to salinity stress

  • Supatida Abdullakasim
  • Pawanrat Kongpaisan
  • Piyaklao Thongjang
  • Parson Saradhuldhat
Research Report Cultivation Physiology

Abstract

The effects of salt stress on the growth, flowering, osmotic potential, and cellular Na+, K+, and Cl accumulation were investigated in potted Dendrobium Sonia ‘Earsakul’. Six NaCl solute concentrations with an electrical conductivity of 0, 2, 4, 6, 8 and 15 dS m−1 were applied to the orchids continuously for 30 days. The results showed that NaCl at 2 dS m−1 or greater significantly reduced the number and dry weight of leaf and flower size. At a NaCl dose of 4 dS m−1 or greater, a reduction in the diameter and number of pseudobulb, and inflorescence lengths were observed. With exposure to a high salinity level of 15 dS m−1 NaCl for 30 days, plants had lost nearly 50% of their leaf dry weight and flower quality. In response to salt stress, osmotic adjustment by accumulation of organic solutes was clearly detected when the orchids were treated with 4 dS m−1 NaCl or greater. This caused a decrease of leaf water and osmotic potential. In addition, it appears the Dendrobium orchid has adapted itself to high salinity conditions by limiting Na+ and Cl exportation to the shoot by accumulating these ions in the roots. Dendrobium also maintained a similar level of K+ afflux in their leaves, pseudobulb, and roots compared to the non NaCl treated control. This created extremely high Na+/K+ ratios in the roots at increasing NaCl concentrations. The overall results suggest that the Dendrobium orchid responds to salinity by performing osmotic adjustment and sequestering Na+ or Cl in the roots, preventing their movement to the upper plant parts.

Keywords

Electrical conductivity Flowering NaCl Osmotic adjustment Osmotic potential Pseudobulb 

Notes

Acknowledgements

We thank ‘Suvarnabhumi Orchids Farm’ at Nakhon Pathom, Thailand for supporting with the plant materials for this study.

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Copyright information

© Korean Society for Horticultural Science and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Supatida Abdullakasim
    • 1
  • Pawanrat Kongpaisan
    • 1
  • Piyaklao Thongjang
    • 1
  • Parson Saradhuldhat
    • 1
  1. 1.Department of Horticulture, Faculty of Agriculture at Kamphaeng SaenKasetsart UniversityKamphaeng SaenThailand

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