Potato tubers temperature

The quality of potato tubers depends upon genetic, climatic, biotic, chemical, and edaphic factors varietal characteristics precipitation, temperature and sunshine conditions competition with other plants the use of chemicals and the physical, chemical, and biological properties of the soil, which influence the capacity of the crop to take up the necessary water and nutrients to ensure success. 

PME activity increased by about 65% in the fresh tubers after 20 min at 60° C, but after 60 min it declined to about 40% of its original value. At 60°C, PME in potato tissue (ev. Kennebec) appears to have a relatively short inactivation time, or possibly its optimum activation temperature is <60°C. In this experiment also, PME aetivity deelined to less than 10% of its original value after 5 min at 70° C, and no aetivity at all was detected when the time at this temperature was prolonged. Similarly, no PME activity was detected in samples blanehed at 80°C. In potato tubers (cvs. Nicola and Irene), Van Dijk et al. (2002) found that the PME activity tended to remain eonstant during preheating at 60°C for 60 min. 

Shomer, L, Rao, M. A., Bourne, M. C., Levy, D. (1993). Impact of temperature and cellulose treatments on rheological behaviour of potato-tuber cell-suspensions. J. Sci. FoodAgric., 63, 245-325. 

Kazami, D., Tsuchiya, T., Kobayashi, Y, Ogura, N. (2000). Effect of storage temperature on quality of potato tubers. J. Japanese Soc. Food Sci. Technol.-Nippon Shokuhin Kagaku Kagaku Kaishi, 47, 851-856. 

Chuda, Y, Ono, H., Yada, H., Takada, A. O., Endo, C. M., Mori, M. (2003). Effects of physiological changes in potato tubers (Solanum tuberosum L.) after low temperature storage on the level of acrylamide formed in potato ehips. Biosci Biotechnol Biochem., 67(5), 1188-1190. 

Sasaki, T., Tadokoro, K. Suzuki, S. (1971). Multiple forms of invertase of potato tuber stored at low temperature. Phytochemistry 10, 2047-50. 

Conditions required to generate A- and B-type crystal conformations are reasonably well-understood. Under cool, wet conditions (such as in a potato tuber), B-type starch crystals form, while in warmer, drier conditions (e.g. in a cereal grain), the A allomorph is preferred. Chain length also affects the selection of crystal form, chains of DP <10 do not crystallize, chains with a DP from 10 to 12 tend to form A-type crystals, and chains with a DP >12 tend to yield the B form.37,38 This is likely the result of differences in loss of entropy on crystallization experienced by chains of different lengths.39 An irreversible transition from B-type starch to A-type starch can be accomplished under conditions of low humidity and high temperature. This so-called... 

It is synthesised by the nitration of 1,2,4,5-tetrachlorobenzene. It was used initially for the protection of stored potato tubers and to inhibit their sprouting. Because of its volatility, it was later used as an aerosol against Botrytis spp. in greenhouses. However, it may be phytotoxic under extreme temperature conditions, or in treatment carried out in direct sunlight (Brown, 1947). 

Sporleder, M.e.a., Effects of temperature on the activity and kinetics of the granulovirus infecting the potato tuber moth. Biological Control, 2008. 

Effects on Gibberellins. Exposure to cold enhances subsequent GA biosynthesis in certain seeds (Ross and Bradbeer 1971). The increase appears to arise from de novo GA biosynthesis and cannot be inhibited by concentrations of ABA which inhibit germination (Arias et al. 1976) and suppress apparent GA biosynthesis in maize shoots (Wareing et al. 1968). Cold increases GA in potato tubers (Thomas and Wurr 1976), while low temperature during tuber germination increases both GA and auxin activity in leaves of potato (Romanova et al. 1975). In corn roots, on the other hand gibberellin production or export is severely inhibited by prolonged exposure to cold (Atkin et al. 1973). 

Romanova LV, Ivanova OA, Tkachenko VN (1975) Effect of light and temperature conditions of potato tuber germination on growth, yield and hormonal activity of the plants. Fiziol Biokhim Kul t Rast 7 625-631 Rosenberry TL, Bernhard SA (1972) Studies of catalysis by acetylcholinesterase. Synergistic effects of inhibitors during the hydrolysis of acetic acid esters. Biochemistry 11 4308-4321... 

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