Physiological and biochemical responses of micropropagated tea plants |
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Authors: | S. Marimuthu R. Raj Kumar |
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Affiliation: | (1) UPASI Tea Research Foundation, Valparai 642 127, Coimbatore District, Nirar Dam BPO, Tamil Nadu, India;(2) Present address: Manager R&D, Parry Agro Industries Limited, Murugalli Estate, Murugalli Bazaar Post 642 118, Coimbatore District, Tamil Nadu, India |
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Abstract: | Summary Physiological and biochemical responses of micropropagated tea plants grown under field conditions were investigated in comparison to vegetatively propagated (VP) plants. No significant variation was observed between tissue culture raised (TC) and VP plants in terms of photosynthetic carbon assimilation rate. However, clones showed significant variation among themselves. Carbon assimilation studies carried out with a radiotracer technique revealed that ‘Assam’ cultivar UPASI-27 assimilated a higher amount of labeled carbon dioxide followed by UPASI-3. However, UPASI-27 was marginally better than UPASI-3 in terms of mobilization of assimilates to the growing sinks. Both, UPASI-3 and UPASI-27 reassimilated higher quantities of photosynthates followed by BSB-1 and UPASI-26. Though there was a marginal variation in photosynthetic pigments of TC and VP plants, it was not statistically significant. Similarly, no significant variations were observed in certain substrates (polyphenols, catechins and amino acids) and enzymes (polyphenol oxidase, peroxidase and phenylalanine ammonia-lyase) except protease involved in the formation of quality constituents of made tea. However, clonal variation was evident with respect to photosynthetic pigments, substrates/enzymes. Under soil moisture stress, no significant variation was observed between VP and TC plants in terms of proline accumulation. |
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Keywords: | 14C assimilation photosynthesis pigments enzymes proline soil moisture stress |
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