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Response of green reflectance continuum removal index to the xanthophyll de-epoxidation cycle in Norway spruce needles

Citation

Kovac, D and Malenovsky, Z and Urban, O and Spunda, V and Kalina, J and Ac, A and Kaplan, V and Hanus, J, Response of green reflectance continuum removal index to the xanthophyll de-epoxidation cycle in Norway spruce needles, Journal of Experimental Botany, 64, (7) pp. 1817-1827. ISSN 0022-0957 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 The Author

DOI: doi:10.1093/jxb/ert069

Abstract

A dedicated field experiment was conducted to investigate the response of a green reflectance continuum removalbased optical index, called area under the curve normalized to maximal band depth between 511 nm and 557 nm (ANMB511557), to light-induced transformations in xanthophyll cycle pigments of Norway spruce [Picea abies (L.) Karst] needles. The performance of ANMB511557 was compared with the photochemical reflectance index (PRI) computed from the same leaf reflectance measurements. Needles of four crown whorls (fifth, eighth, 10th, and 15th counted from the top) were sampled from a 27-year-old spruce tree throughout a cloudy and a sunny day. Needle optical properties were measured together with the composition of the photosynthetic pigments to investigate their influence on both optical indices. Analyses of pigments showed that the needles of the examined whorls varied significantly in chlorophyll content and also in related pigment characteristics, such as the chlorophyll/carotenoid ratio. The investigation of the ANMB511557 diurnal behaviour revealed that the index is able to follow the dynamic changes in the xanthophyll cycle independently of the actual content of foliar pigments. Nevertheless, ANMB511557 lost the ability to predict the xanthophyll cycle behaviour during noon on the sunny day, when the needles were exposed to irradiance exceeding 1000 μmol m2 s1. Despite this, ANMB511557 rendered a better performance for tracking xanthophyll cycle reactions than PRI. Although declining PRI values generally responded to excessive solar irradiance, they were not able to predict the actual de-epoxidation state in the needles examined.

Item Details

Item Type:Refereed Article
Keywords:chlorophyll to carotenoid ratio, continuum removal, excessive irradiance, leaf reflectance, spectral index, xanthophyll cycle pigments
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Forestry not elsewhere classified
Author:Malenovsky, Z (Dr Zbynek Malenovsky)
ID Code:86568
Year Published:2013
Web of Science® Times Cited:6
Deposited By:Geography and Environmental Studies
Deposited On:2013-09-25
Last Modified:2014-04-15
Downloads:0

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