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Effects of freezing stresses in physiological functions in excised winter rape leaves



Effects of freezing stresses in physiological functions in excised winter rape leaves



Vedecke Prace Annals of the Research Institute for Crop Production (22): 156-167



The results demonstrate that under the influence of more severe freezing stresses the injury to leaf blades [of Brassica napus] evaluated according to the amount of leaked electrolytes increases. In a parallel way intensity of photosynthesis slows down. It is demonstrated particularly by the values of the dry matter increase converted to the parallelly occurring loss of dry matter of the discs. The intensity of the oxygen absorption decreases only after more severe stresses causing the uncoupling of oxidizing phosphorylation as well. The above mentioned characteristics were after the freezing stress of identical intensity more changed in older than in younger leaves. They were greater also in apical than basal parts of the leaf blade. The range of frost intensities resulting in considerable changes of photosynthesis as well as of permeability is relatively narrow[2 to 4.degree. C]. But the actual temperatures causing them are different in the leaves and those parts of the plant which differ in their physiological condition and ontogenic development. They change also during winter and finally they are also different in the characteristics of different states, e.g. of membrane permeability or functions [photosynthesis and respiration].

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Accession: 001580962

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