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Fluorescence parameters as early indicators of light stress in barley

Paper ID Volume ID Publish Year Pages File Format Full-Text
30807 44505 2012 6 PDF Available
Title
Fluorescence parameters as early indicators of light stress in barley
Abstract

Photosynthetic efficiency of two Syrian barley landraces Arabi Aswad and Arabi Abiad grown under different light intensities were studied by the application of qualitative and quantitative analysis of chlorophyll a fluorescence. Different values of fluorescence parameters, quantum efficiencies, specific and phenomenological energy fluxes were obtained for each cultivar. Both low and high light stresses decreased photosystem II (PSII) activity in barley seedlings depending on the stress type and its duration. Cultivar Arabi Aswad was more tolerant to high light while Arabi Abiad was more tolerant to low light stress. The results allowed us to select chlorophyll a fluorescence parameters related to energy flux within PSII which were specifically affected under low or high light stress. We found that the performance index parameter is a sensitive indicator to explore the effect of light changes on PSII activity immediately after stress application, while maximal quantum yield of PSII and phenomenological parameters were only modified after a long period of stress application indicating PSII damage. Thus, we recommend the former parameter for early detection of light stress.

► Low and high light effects on photosynthetic efficiency of barley was studied. ► These effects were dependent on the time of the stress application and the tested cultivar. ► We were able to capture changes in PSII bioenergetics just after stress application. ► Performance Index is the most sensitive parameter to explore light stress in barley.

Keywords
Barley; Chlorophyll a fluorescence; JIP-test; Photosynthesis; Photosystem II
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 112, 2 July 2012, Pages 1–6
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us