Comparison of phytochemistry capacity between fruit peel and leaf using simultaneous measurements of prompt fluorescence,delayed fluorescence and 820 nm light reflection
In this study,the capacity of phytochemistry between fruit peels and leaves of apple and plum was compared using simultaneous measurements of prompt fluorescence,delayed fluorescence and 820 nm light reflection.At different developmental stages of fruits,no difference was found between fruit peels and leaves in the maximum quantum yield of PSⅡ,indicating that they had similar capacities in light energy capture by PSⅡ and the following transfer to P680.However,differences in J-and l-step of prompt fluorescence suggested that the capacity of photosynthetic electron transport to QA and the capacity of PSI were both lower in fruit peels compared with leaves.The differences in prompt fluorescence between peels and leaves also indicated that the electron transfer capacity at the donor side of PSⅡ was also signif-icant lower in fruit peels.Induction and decay kinetics of delayed fluorescence showed that photosynthet-ic electron transfer capacities at the donor and acceptor sides of P680 were both lower in fruit peels com-pared with leaves.The initial decrease of light reflection at 820 nm was slower in fruit peels than leaves,indicating that the phytochemistry capacity at PSI was lower in peels.In general,the results from three techniques complemented and confirmed each other.The phytochemistry capacities at both photosys-tems were much lower in fruit peels than leaves,which might be one the key factors that why fruit peels are more sensitive to high light.
fruit peelprompt fluorescencedelayed fluorescence820 nm light reflectionphytochemistry
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