NDLI: Effects of high temperature coupled with high light on the balance between photooxidation and photoprotection in the sun-exposed peel of apple

Content Provider	Springer Nature Link
Author	Chen, Li Song Li, Pengmin Cheng, Lailiang
Copyright Year	2008
Abstract	The sun-exposed peel of ‘Gala’ apple with or without sunburn was compared in terms of photooxidation and photoprotection, and a controlled experiment was conducted to probe the initial responses of PSII to high light and high temperature. The content of carotenoids, lutein and xanthophylls on a chlorophyll basis was higher in the sunburned peel although they were lower expressed on a peel area basis. Significant loss of β-carotene and neoxanthin was observed relative to chlorophylls in the sunburned peel. O2 evolution rates and the activity of key enzymes in the Calvin cycle were lower in the sunburned peel, but the activity of these enzymes decreased to a lesser extent than the O2 evolution rates. The activity of antioxidant enzymes in the ascorbate-glutathione cycle and the level of total ascorbate, total glutathione, and reduced glutathione were higher in the sunburned peel. However, the sunburned peel had higher H2O2 and malondialdehyde contents. Fruit peels treated with high temperature (45°C) alone showed a clear “K” step in their chlorophyll fluorescence transients whereas high temperature coupled with high light (1,600 μmol m−2 s−1) led to the disappearance of the “K” step and a further decrease in F V/F M (similar to what was observed in the sunburned peel). We conclude that high temperature coupled with high light damages the PSII complexes at both the donor and acceptor sides. Although both the xanthophyll cycle and the antioxidant system are up-regulated in response to the photooxidative stress, this up-regulation does not provide enough protection against the photooxidation.
Starting Page	745
Ending Page	756
Page Count	12
File Format	PDF
ISSN	00320935
Journal	Planta
Volume Number	228
Issue Number	5
e-ISSN	14322048
Language	English
Publisher	Springer-Verlag
Publisher Date	2008-07-08
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Antioxidant system Apple Chlorophyll a fluorescence transient Malus Photoinhibition Sunburn Sun-exposed peel Forestry Ecology Agriculture Plant Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science

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