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1990 Fiscal Year Final Research Report Summary

Physiological and Biochemical Studies on the Responses and Adaptation of Plants to Salt Stress.

Research Project

Project/Area Number 63480052
Research Category

Grant-in-Aid for General Scientific Research (B)

Allocation TypeSingle-year Grants
Research Field 土壌・肥料
Research InstitutionOkayama University

Principal Investigator

KAWASAKI Toshio  Okayama University Research Institute for Bioresources Professor, 資源生物科学研究所 (90033109)

Co-Investigator(Kenkyū-buntansha) SHIBASAKA Mineo  Okayama University Research Institute for Bioresources Research Associate, 資源生物科学研究所, 助手 (60226165)
MORITSUGU Masumi  Kagawa University Department of Agriculture Professor, 農学部, 教授 (80033116)
Project Period (FY) 1988 – 1990
KeywordsCalcium / Halophyte / Potassium / Salicornia / Salt tolerance / Sodium / Respiration
Research Abstract

The responses and adaptation of plants on salt stress were investigated physiologically and biochemically, mainly using a multi-compartment transport box technique. Excised roots of Salicornia (Salicornia Virginica L.) and barley (Hordeum vulgare L., cv. Akashinriki) were used as experimental materials.
The results showed that Ca considerably depressed Na absorption and translocation in both Salicornia and barley roots. High concentrations of NaCl inhibited the absorption and translocation of K in the roots of both plants in the absence of Ca, especially in barley. However, Ca addition alleviated greatly the adverse effect of NaCl on K uptake in the both Salicaornia and barley roots. In contrast to barley, high concentrations of NaCl appeared to stimulate K uptake in Salicornia roots in the presence of Ca.
To investigate the mechanism of NaCl-stimulated K uptake in Salicornia roots in more detail, DNP, CCCP and vanadate were used as metabolic inhibitors. The stimulating effect of NaCl on K uptake was inhibited by DNP and CCCP, but not by vanadate. The results suggest that the NaCl-stimulated K uptake is involved in the energy metabolism, but not in ATPase activity.
In addition, it was found that NaCl up to 200 mM stimulated K uptake and the respiratory activity in Salicornia roots, while increasing concentrations of NaCl inhibited both activities in barley roots.
From the results, Salicornia seems to be more effective than barley in protecting the K-nutrition in its roots from the adverse effect of salt stress. The findings show that Salicornia responded to high NaCl concentrations by regulating a more efficient K uptake which results in a higher K content in the roots in the presence of Ca.
The results in the present experiments give us an important approach in the study of salt tolerance in plants.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] D.Sopandie,M.Moritsugu and T.Kawasaki: "Effect of Ca on the absorption and translocation of Na,K and Cl in NaClーstressed Salicornia virginica and barley roots:Multicompartment transport box experiment." proceedings of the Yamada Conference XXII“plant Water Relations and Growth under Stress(Ed.M.Tazawa et al.). 449-451 (1989)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Sopandie,M.Moritsugu and T.Kawasaki: "Interactions between Ca,Na,and K in Salicornia virginica and barley roots under saline conditions:Multiーcompartment transport box experiment." Soil Science and Plant Nutrition. 36. 65-71 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D.Sopandie,T.Kawasaki and M.Moritsugu: "Effects of metabolic inhibitors on Na^+ーstimulated K^+ uptake in Salicornia virginica roots:Possibility of metabolic coupling of the transport." Soil Science and Plant Nutrition. 36. 519-522 (1990)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] D. Sopandie, M. Moritsugu and T. Kawasaki: "Effect of Ca on the absorption and translocation of Na, K and Cl in NaCl-stressed Salicornia virginica and barley roots : Multi-compartment transport box experiment." Proceedings of the Yamada Conference XXII "Plant Water Relations and Growth under Stress (Ed. M. Tazawa et al.). 449-451 (1989)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D. Sopandie, M. Moritsugu and T. Kawasaki: "Interactions between Ca, Na, and K in Salicornia virginica and barley roots under saline conditions : Multi-compartment transport box experiment." Soil Science and Plant Nutrition. Vol. 36. 65-71 (1990)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] D. Sopandie, T. Kawasaki and M. Moritsugu: "Effects of metabolic inhibitors on Na^+-stimulated K^+ uptake in Salicornia virginica roots : Possibility of metabolic coupling of the transport." Soil Science and Plant Nutrition. Vol. 36. 519-522 (1990)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1993-08-12  

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