Potluri, Sasikala D.,; Devi Prasad, P.V.
Author Affiliation, Ana.
Life Sciences (Botany and Zoology)
Influence of salinity on axillary bud cultures of six lowland tropical varities of potato (Solanum tuberosum)
Plant cell, tissue and organ culture
Date of Publication
Axillary bud cultures of six low-land tropical varieties of potato Solanum tuberosum(L.T. 2,5,6,7,8 and 9) were studied for their response to salinity stress using crude sea salt. Concentrations of 0.8% and above severely inhibited the growth, while decreased growth was observed for 0.4% and 0.6% salt in all the varieties, with occasional shoot tip necrosis and compound leaf formation. A lower concentration of salt (0.2%) was beneficial and increased shoot weight in most varieties. Protein content showed a positive correlation with proline levels, indicating that proline accumulation was due to new synthesis rather than breakdown of existing proteins. Soluble carbohydrates increased in the stem with increasing salt. Roots showed an increase in sodium content while shoots showed increased potassium levels with increasing salt concentrations. There was a positive correlation between dry weight yields and K/Na ratio. The synthesis of proline, accumulation of soluble carbohydrates, and increase in potassium and sodium content were all used by the different varieties of potato to adjust the physiology in response to salt stress....