The sun-exposed peel of apple fruit has a higher photosynthetic capacity than the shaded peel

Functional Plant Biology : FPB
Li-Song Chen, Lailiang Cheng

Abstract

To determine whether the sun-exposed peel of apple fruit has a higher photosynthetic capacity than the shaded peel, fruit peel samples were taken in both early July and early September from the exterior part of the canopy of mature 'Liberty'/M.9 trees for measuring oxygen evolution, key enzymes and metabolites involved in photosynthesis, and chlorophyll fluorescence. Compared with the shaded peel, the sun-exposed peel had higher light-saturated oxygen evolution rate and higher light saturation point, but lower apparent and true quantum yields. The activity of ribulose-1,5-bisphosphate carboxylase/oxygenase, glyceraldehyde-3-phosphate dehydrogenase, phosphoribulokinase, stromal fructose-1,6-bisphosphatase, ADP-glucose pyrophosphorylase and sucrose-phosphate synthase (SPS) were higher in the sun-exposed peel than in the shaded peel on both sampling dates except that no significant difference was found in SPS activity between the two peel types in September. No significant difference was detected in the concentration of key metabolites (G6P, F6P, G1P, and PGA) between the sun-exposed peel and the shaded peel, suggesting that the response of the key enzymes to light exposure is well coordinated. Chlorophyll fluorescence quenching a...Continue Reading

References

Aug 15, 2000·Journal of Photochemistry and Photobiology. B, Biology·M N Merzlyak, O B Chivkunova
Oct 29, 2000·Journal of Experimental Botany·L Cheng, L H Fuchigami
May 6, 2003·Annals of Botany·David J Burritt, Susan Mackenzie
Oct 27, 2004·Journal of Plant Physiology·Josef Berüter
Oct 18, 2005·Photosynthesis Research·J M AndersonP R van Hasselt
Aug 1, 1991·Plant Physiology·A L MancinelliA Moroni
Mar 1, 1990·Photosynthesis Research·S S Thayer, O Björkman
Sep 1, 1990·Photosynthesis Research·O van Kooten, J F Snel

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