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Specific features of low-temperature hardening (6 days at 8°C) of cold-sensitive tobacco plants (Nicotiana tabacum, cv. Samsun) related to changes in the cell-wall invertase activity were studied. During cold hardening, oppositely directed changes in this enzyme activity occurred in tobacco leaves and roots. In the leaves, cell-wall invertase was activated (approximately by 30%), the content of sugars increased (approximately by 25%), and the content of sucrose, the main transport form of sugars, in the apoplast reduced by three times; all these changes indicate that assimilate outflow from leaves to roots was inhibited. In contrast, in the root system, enzyme activity was decreased almost twice and the content of sugars in them was essentially unchanged. It is suggested that a strategy of low-temperature adaptation of cold-sensitive tobacco plants aimed at creating the high cold tolerance of aboveground parts, even at the expense of the root system, which, under conditions of native vegetation, is not practically exposed to damaging low temperatures.
Russian Journal of Plant Physiology – Springer Journals
Published: Feb 17, 2013
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