Summary
The performance of two rice varieties selected for sodicity tolerance and sensitivity was studied in pot culture. Tolerant variety CSR-1 showed much better survival, plant growth and yield as compared to the sensitive one (Basmati-370). Sensitive variety was characterized by higher reduction in growth yield, higher Na and lower K concentrations under sodicity in all the plant organs. Highest Na concentrations are in sensitive variety and its distribution is in the order of Senescent yellow leaves > Earheads > Stem > Younger green leaves.
Analysis of different leaves revealed leaf to leaf gradients in terms of Na and K and Na/K ratio were lowest in the youngest leaf and highest in the oldest surviving leaf and these values were much higher in the sensitive variety. This showed that Na ions are mainly localised in the older leaves, which are shed and provide a secondary process of tolerance. Thus the tolerant variety is best marked by maintenance of K levels and much lower increases in Na in all the plant organs, especially earheads, inspite of their growing in highly sodic soils.
This is a preview of subscription content, log in via an institution to check access.
References
Bhattacharyya R K 1976 J. Sec. Exp. Agri. 1, 21–24.
Epstein E 1977In Proceedings of a Workshop on Plant Adaptation to Mineral Stress, Ed. M J Wright, pp 73–82. Beltsville, Maryland.
Flowers T J and Yeo A R 1981 New Phytol. 88, 363–373.
Greenway H'Aust. J. Biol. Sci. 18, 763–769.
Greenway H and Munns R 1980. Annu. Rev. Plant Physiol. 31, 149–190.
Jackson M L 1967 Soil Chemical Analysis, Prentice Hall of India, New Delhi.
Joshi U C 1976 Ind. J. Plant Physiol. 19, 190–193.
Mishra B and Bhattacharyya R K 1980In Proceedings International Symposium on Principles and Practices for Reclamation and Management of Salt-affected Soils, Karnal Feb. 18 to 21 1980 pp. 502–507.
Sharma S K, Joshi Y C and Bal A R 1984 Ind. J. Plant Physiol 27(2), 153–158.
Shannon M C 1978 Agron. J. 70, 719–722.
Van Steveninck R F Met al. 1982 Physiol. Plant. 56, 465–475.
Yeo A R and Flowers T J 1983 Physiol. Plant. 56, 343–348.
Yeo A R and Flowers T J 1983 Physiol. Plant. 59, 189–195.
Yeo A R and Flowers T J 1984In Salinity Tolerance in Plants. Eds. R C Staples and G H Toenniessen. pp 151–170 Wiley Interscience.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Sharma, S.K. Mechanism of tolerance in rice varieties differing in sodicity tolerance. Plant Soil 93, 141–145 (1986). https://doi.org/10.1007/BF02377155
Received:
Revised:
Issue Date:
DOI: https://doi.org/10.1007/BF02377155