Physiological and biochemical responses of two cultivars of wheat to elevated levels of CO2 and SO2, singly and in combination
| Autor: | S.Singh Deepak, Madhoolika Agrawal |
|---|---|
| Rok vydání: | 2003 |
| Předmět: |
Stomatal conductance
Air Pollutants Starch Health Toxicology and Mutagenesis food and beverages General Medicine Carbon Dioxide Toxicology Photosynthesis Catalase Pollution chemistry.chemical_compound Horticulture Agronomy chemistry Phenols Germination Carbon dioxide Carbohydrate Metabolism Sulfur Dioxide Cultivar Respiration rate Triticum Transpiration |
| Zdroj: | Environmental pollution (Barking, Essex : 1987). 121(2) |
| ISSN: | 0269-7491 |
| Popis: | In view of the present increasing trends of anthropogenic emissions of carbon dioxide (CO 2 ) and sulphur dioxide (SO 2 ) throughout the world, the present study was aimed at investigating the long-term influence of elevated concentrations of CO 2 and SO 2 , singly and in combination on the physiological and biochemical characteristics of two cultivars of wheat ( Triticum aestivum L. cv. Malviya 234 and HP1209). For this purpose, the plants were grown in open top chambers under field conditions and were fumigated with 600 ppm CO 2 , 0.06 ppm SO 2 and 600 ppm CO 2 +0.06 ppm SO 2 separately for 8 h daily (0800–1600 h) from germination to grain maturity. The individual treatment of SO 2 advers#ely affected both the cultivars of wheat by reducing protein and starch contents. The respiration rate, total soluble sugars and total phenolics, however, increased in response to SO 2 . Stimulation of photosynthesis rate and reduction in stomatal conductance and transpiration rate were observed under CO 2 treatment. Concentrations of total soluble sugars, starch and total phenolics increased in response to CO 2 and CO 2 +SO 2 treatments. In combined treatment, CO 2 modified the plant response to SO 2 in both the cultivars. Elevated CO 2 increased the photosynthesis rate under combined treatment. Higher levels of starch and soluble sugars under combined treatment provided extra carbon for SO 2 detoxification. The pattern of intraspecific response of wheat to different treatments was more or less similar, but the magnitude of response differed significantly. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect