The role of carbohydrates in the responses of chilling-sensitive plants to short- and long-term low-temperature treatments | Роль углеводов в реакции теплолюбивых растений на кратковременные и длительные низкотемпературные воздействия
2010
Markovskaya, E.F. | Sherudilo, E.G. | Sysoeva, M.I., Russian Academy of Sciences, Petrozavodsk (Russian Federation). Karelian Research Centre. Inst. of Biology | Galibina, N.A., Russian Academy of Sciences, Petrozavodsk (Russian Federation). Karelian Research Centre. Forest Inst.
The content of particular components of water-soluble carbohydrates and cold tolerance of cucumber (Cucumis sativus L.) cotyledonary leaves were studied at early developmental stages in dynamics during 6-day-long treatment with a temperature reduced to 12 deg C at 2 regimes: short-term cooling (2 hours at the end of a night period, DROP) or permanent low-temperature treatment (PLT). PLT cucumber plants were characterized by accumulation of oligosaccharides, whereas DROP plants were done by increased amounts of glucose, fructose and raffinose, indicating their higher metabolic status. When the changes of carbohydrate fractions were compared with a dynamics of cold tolerance, it was found that the changes were synchronous in PLT plants, but asynchronous for glucose and oligosaccharides in DROP plants. It was supposed that 2 pools of sugars were produced in cotyledonary leaves of DROP plants; one of them was used for tolerance development and the another one was done in active metabolism. That provided a combination of activated metabolism and high cold tolerance of the plants. In PLT plants all components of water-soluble carbohydrates were involved in cold tolerance development.
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