The higher resistance to chilling stress in adaxial side of <Emphasis Type="Italic">Rumex</Emphasis> K-1 leaves is accompanied with higher photochemical and non-photochemical quenching |
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Authors: | P-M Li P Fang W-B Wang H-Y Gao T Peng |
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Institution: | 1.State Key Laboratory of Crop Biology; College of Life Sciences,Shandong Agricultural University,Tai’an,China;2.Department of Horticulture,Cornell University,Ithaca,USA |
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Abstract: | Responses of two sides of Rumex K-1 leaves to chilling stress (5 °C, photon flux density of 100 μmol m−2 s−1) were studied by using gas exchange, chlorophyll (Chl) fluorescence, and spectrum reflectance techniques. The Chl and carotenoid
contents in the two sides were not affected by chilling treatment, and both were higher in the adaxial side. The maximum quantum
yield of photosystem (PS) 2 and fraction of functional PS1 in the abaxial side decreased more markedly than those in the adaxial
side during the chilling treatment, indicating that the abaxial side was damaged more significantly than the adaxial side.
Before chilling, there were no obvious differences in actual photochemical efficiency of PS2, photosynthesis, and photorespiration
between two sides of the leaves. Under chilling stress, the actual photochemical efficiency of PS2, photosynthesis, and photorespiration
all declined more significantly in the abaxial side, which was partly attributed to lower carboxylation efficiency in the
abaxial side than that in the adaxial side. Non-photochemical quenching was higher in the adaxial side, though the de-epoxidation
of xanthophyll cycle pigments’ pool on basis of Chl was higher in the abaxial side. Both the slower decrease in the photochemical
quenching and the higher non-photochemical quenching may account for the higher resistance to chilling stress in the adaxial
side of Rumex K-1 leaves. |
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