Alteration of the respiratory function in chill-sensitive callus due to low temperature stress I. Involvement of the alternate pathway

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The diversion of electron flow to the alternate pathway in mitochondria of chill-sensitive callus of Cornus stolonifera was studied with reference to the immediate response of the cells to chilling. Temperatures below 15℃ diverted the bulk of respiration to the alternate path, proportionally as the temperature decreased to 0℃. The alternate path, however, existed in cells in a suppressed form at temperatures above 15℃. In chill-resistant callus of Sambucus Sieboldiana, no alteration was noted in electron apportionment between the cytochrome path and the alternate path. Thus, there seems to be a marked difference in the mode of respiration between sensitive and resistant plant cells at low temperatures. The respiratory control ratio also markedly declined at temperatures below 15℃ in chill-sensitive callus, but a higher respiratory control ratio was observed below 10℃ in chill-resistant callus. From these results, an alteration in the regulatory system for electron apportionment between the two paths is probably the most immediate response of chill-sensitive cells to low temperatures.
日本植物生理学会の論文