Drought induced biochemical changes in young tea leaves
2001
Chakraborty, U. (University of North Bengal, Siliguri (India). Plant Biochemistry Laboratory) | Dutta, S. (University of North Bengal, Siliguri (India). Immuno-Phytopathology Laboratory) | Chakraborty, B. (University of North Bengal, Siliguri (India). Department of Botany)
Water stress was imposed on one-and-a-half year old plants of six varieties of tea (Camellia sinensis) viz. TV-22, TV-23, TV-25, TV-26, TV-27 and T-17, by whithholding irrigation for 7 and 14 days. Levels of phenolics and related enzymes, free proline and protein content were determined. Of the six varieties, TV-25, TV-26, TV-27 and T-17 could with stand only 7 days stress while TV-22 and TV-23 could withstand drought upto fourteen days. These four varieties started wilting after 7 days and had completely wilted by the 10th day. TV-22 and TV-23 survived upto 14 days after which they too wilted. Both total phenol and phenylalanine ammonia-lyase (PAL) activity increased moderately in those 4 varieties following 7 days stress, while longer period of drought resulted in a sharp decrease of both phenolics and PAL activity. Peroxidase activity increased following drought while polyphenol oxidase activity reigistered a marked decline. Free proline content increased significantly in all tested varieties after both 7 days and 14 days stress. Protein content was not significantly affected in all varieties after 7 days of drought while after 14 days there was a significant decrease in protein content.
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