Abstract
The Vigna radiata L. plants were grown in greenhouse at moisture content of sand (SMC) of 12.0 ± 0.5 %. At flower bud initiation stage, i.e. 45 - 50 d after sowing, the SMC was decreased to 3.5 ± 0.5 %, and the effects of applied potassium (0, 2.56 and 3.84 mmol dm-3) were studied. During water stress, K-fed plants maintained higher leaf water potential and relative water content (RWC) of leaves and nodules and lower osmotic potential as compared to untreated plants. The proline content was higher in nodules than in leaves showing their difference in degree of stress. A partial recovery was found after re-irrigation. When subjected to drought, carbon was accumulated in the leaves and declined in nodules and roots. K-fed plants showed higher C and N content in stem, roots and nodules than untreated plants. The content of K significantly increased in stem and nodules in K-fed plants, irrespective of SMC. Dry masses of different plant parts were also increased in K-fed plants.
Similar content being viewed by others
References
Bates, L.S., Waldren, R.P., Teare, L.D.: Rapid determination of free proline for water stress studies.-Plant Soil 39: 205-207, 1973.
Maribona, B.R., Tenorio, J.L., Conde, J.R., Ayerbe, L.: Correlation between yield and osmotic adjustment of peas (Pisum sativum) under drought stress.-Field Crops Res. 29: 15-22, 1992.
Nandwal, A.S., Bharti, S., Kuhad, M.S., Singh, J.: Response of pigeonpea cultivars to water stress.-Biol. Plant. 35: 641-644, 1993.
Nandwal, A.S., Bharti, S., Kuhad, M.S.: Partitioning of 14C assimilates, total 14C activity and growth under water stress and during recovery in indeterminate Cajanus cajanL.-L.-J. arid Environ 33: 367-377, 1996.
Nandwal, A.S., Kundu, B.S., Hooda, A., Kuhad, M.S.: Water relations and N2-fixation in potassium fed Vigna radiataL. nodules.-Biol. Plant. 38: 629-632, 1996.
Walkley, A.J., Black, T.A.: Estimation of soil organic carbon by the chromic acid titration method.-Soil Sci. 37: 29-38, 1934.
Weatherley, P.E.: Studies on the water relation of the cotton plant. I. The field measurement of water deficit in leaves.-New Phytol. 40: 81-97, 1930.
Wilson, D.O., Reisenauer, H.M.: Cobalt requirement of symbiotically grown alfalfa.-Plant Soil 19: 364-373, 1963.
Rights and permissions
About this article
Cite this article
Nandwal, A., Hooda, A. & Datta, D. Effect of Substrate Moisture and Potassium on Water Relations and C, N and K Distribution in Vigna Radiata . Biologia Plantarum 41, 149–153 (1998). https://doi.org/10.1023/A:1001745423649
Issue Date:
DOI: https://doi.org/10.1023/A:1001745423649