|Author:||Garg, B. K. ; Kathju, S. ; Lahiri, A. N. ; Vyas, S. P.|
|Book Group Author:||NA|
The combined effects of water and salt stresses assume importance when kharif crops suffering from drought are given life-saving irrigation with poor quality waters. Therefore, a study was undertaken to quantify the relationship between the intensity of water stress and salinity levels of irrigation water on performance and metabolism of cluster bean (Cyamopsis tetragonoloba). Experimental plants of cluster bean (cv. Maru guar) subjected to mild (-1.4 MPa), moderate (-2.1 MPa) and severe (-2.8 MPa) water stresses (control: -0.8 MPa) at the critical stage of flowering were irrigated with saline waters of 0, 5 and 10 dS m-1 EC having composition similar to local ground waters. The data on plant performance (growth in height, leaf area, dry matter production, pod and seed yield) as well as levels of leaf metabolites (soluble protein, free proline, free amino acids, chlorophyll) and activities of enzymes of nitrogen metabolism, such as nitrate reductase, glutamine synthetase [glutamate-ammonia ligase] and glutamate synthase were obtained. Increasing water stress as well as salt stress progressively increased levels of free proline and free amino acids but decreased those of soluble protein and chlorophyll and activities of various enzymes. However, the effects of water stress at the highest intensity were more detrimental than recorded those with the highest level of salt stress employed. Furthermore, seed yield of plants obtained even with the highest salt load was significantly higher than that of drought-treated plants revived with non-saline tap water. Results also revealed that much advantages could be gained if supplemental irrigation even with highest salt load (10 dS m-1) is applied at the onset of the drought event or under mild water stress. Irrigation at belated stage may cause severe detrimental effect on crop performance due to cumulative adverse effects of drought and salinity on plant growth and leaf metabolism.
|Pages:||157 - 161|
|Journal:||Journal of Arid Legumes|
application rates, chlorophyll, cluster beans, crop yield,drought, drought resistance, dry matter, dry matter accumulation, enzymeactivity, enzymes, free amino acids, glutamate synthase,glutamate-ammonia ligase, guar, irrigation, irrigation water, leaf area,leaves, metabolism, metabolites, nitrate reductase, nitrogen metabolism,plant height, plant proteins, pods, proline, saline water, salinity,seeds, stress, stress response, water deficit, water stress, Cyamopsistetragonoloba, Cyamopsis, Papilionoideae, Fabaceae, Fabales,dicotyledons, angiosperms, Spermatophyta, plants, eukaryotes, droughttolerance, glutamine synthetase, salt water, watering, Field Crops(FF005) (New March 2000), Plant Physiology and Biochemistry (FF060),Plant Production (FF100), Environmental Tolerance of Plants (FF900),Soil Water Management (Irrigation and Drainage) (JJ800) (Revised June2002) [formerly Soil Water Management]