Effect of phytohormones on biochemical parameters in Indian mustard under abiotic stress conditions

Abstract

An experiment was carried out to see the interactive effect of hormones and stress treatments {water logging (WL), high temperature(HT) and water logging + high temperature(WL+HT)}on biochemical parameters in Indian mustard [Brassica juncea (L.) Czern and Coss.]. The deleterious effect was pronounced under water logged conditions followed by water logging + high temperature and high temperature. Chlorophyll ‘a’ (8.11 and 8.22), b (1.68 and 1.69) and total chlorophyll (9.79 and 9.88) is significantly higher at higher concentration of hormones (IAA 500 μM and Kinetin 50 μM respectively) in comparison to lower concentration and control of water logged plants. Plants grown under HT and WL+HT stress showed similar results as water logged plants. Though the ameliorative effect on stressed plants observed after application of hormones, the carotenoid content (1.54, 1.26 and 1.57) was lower in WL, HT and WL+HT respectively in kinetin 50 μM sprayed plants. A pronounced increase in total soluble carbohydrates (59.5 and 63.60), in IAA 500 μM and kinetin 50 μM sprayed plants respectively. Free amino acids is maximum (71.91) of kinetin 50 μM sprayed plants and proline content (5.28) observed in kinetin 5 μM treated plants