The dynamics of nutrient utilization and growth of apple root stock ‘M9 EMLA’ in temporary versus continuous immersion bioreactors |
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Authors: | D Chakrabarty Y H Dewir E J Hahn S K Datta K Y Paek |
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Institution: | (1) Floriculture Section, National Botanical Research Institute, Lucknow, 226001, India;(2) Department of Horticulture, Faculty of Agriculture, Kafr El Sheikh University, Kafr El Sheikh, 33516, Egypt;(3) Research Center for the Development of Advanced Horticultural Technology, Chungbuk National University, Cheong-ju, 361-763, Korea |
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Abstract: | The present study investigated the dynamics of nutrient utilization and various growth and physiological parameters during
in vitro proliferation of apple root stock ‘M9 EMLA’ in two different bioreactor systems, i.e. temporary and continuous immersions.
Individual shoots obtained from temporary immersion system had higher dry mass and were of better quality than those obtained
from continuous immersion. In continuous immersion bioreactor, apple shoots appeared to utilize more nutrients from liquid
culture medium than that from temporary immersion. The shoot growth was limited by the availability of phosphate and nitrogen
in continuous immersion system. The shoots produced in temporary immersion bioreactor showed higher photosynthetic rate, maximum
quantum yield of photosystem-II and slow but steady rate of nutrient absorption, indicating the occurrence of higher photomixotrophic
metabolism. The study also showed that high level of antioxidant scavenging enzymes in shoots grown in continuous immersion
system induced physiological changes to foster adaptation to stresses. |
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Keywords: | Antioxidant enzymes Apple Bioreactor Continuous immersion system F v/F m Nutrient utilization Temporary immersion system |
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