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Functional role of anthocyanins in high-light winter leaves of the evergreen herb Galax urceolata.

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Title: Functional role of anthocyanins in high-light winter leaves of the evergreen herb Galax urceolata.
Authors: Hughes, N. M.1, Neufeld, H. S.1 neufeldhs@appstate.edu, Burkey, K. O.2
Source: New Phytologist. Dec2005, Vol. 168 Issue 3, p575-587. 13p. 2 Color Photographs, 1 Chart, 9 Graphs.
Subjects: Leaf color, Anthocyanins, Antioxidants, Plant photoinhibition, Effect of light on plants, Evergreens, Herbs
Abstract: • High-light leaves of the evergreen herb Galax urceolata exhibit a striking color change from green to red during winter months due to anthocyanin synthesis in outermost mesophyll cells. Here we investigate three possible functions of this color change. • To test the hypothesis that anthocyanins function as light attenuators, maximum photosystem II efficiency ( Fv /Fm) of red and green leaves was measured during and after exposure to wavelengths either strongly or poorly absorbed by anthocyanin. To determine whether anthocyanins elevate radical-scavenging capacity, antioxidant activity of red and green leaves was assessed using the α,α-diphenyl-β-picrylhydrazyl assay. Nonstructural carbohydrate levels were analyzed to test the hypothesis that anthocyanins function as a carbon sink. • Declines in Fv /Fm under white and green light were significantly greater for green than red leaves, but were comparable under red light. Anthocyanin content positively correlated with antioxidant activity. Although levels of anthocyanins did not appear to be related to nonstructural carbohydrate concentration, high levels of sugars may be necessary for their photoinduction. • Results suggest that anthocyanins function as light attenuators and may also contribute to the antioxidant pool in winter leaves. [ABSTRACT FROM AUTHOR]
Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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  Data: Functional role of anthocyanins in high-light winter leaves of the evergreen herb Galax urceolata.
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  Data: <searchLink fieldCode="AR" term="%22Hughes%2C+N%2E+M%2E%22">Hughes, N. M.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Neufeld%2C+H%2E+S%2E%22">Neufeld, H. S.</searchLink><relatesTo>1</relatesTo><i> neufeldhs@appstate.edu</i><br /><searchLink fieldCode="AR" term="%22Burkey%2C+K%2E+O%2E%22">Burkey, K. O.</searchLink><relatesTo>2</relatesTo>
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  Data: <searchLink fieldCode="JN" term="%22New+Phytologist%22">New Phytologist</searchLink>. Dec2005, Vol. 168 Issue 3, p575-587. 13p. 2 Color Photographs, 1 Chart, 9 Graphs.
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  Data: <searchLink fieldCode="DE" term="%22Leaf+color%22">Leaf color</searchLink><br /><searchLink fieldCode="DE" term="%22Anthocyanins%22">Anthocyanins</searchLink><br /><searchLink fieldCode="DE" term="%22Antioxidants%22">Antioxidants</searchLink><br /><searchLink fieldCode="DE" term="%22Plant+photoinhibition%22">Plant photoinhibition</searchLink><br /><searchLink fieldCode="DE" term="%22Effect+of+light+on+plants%22">Effect of light on plants</searchLink><br /><searchLink fieldCode="DE" term="%22Evergreens%22">Evergreens</searchLink><br /><searchLink fieldCode="DE" term="%22Herbs%22">Herbs</searchLink>
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  Data: • High-light leaves of the evergreen herb Galax urceolata exhibit a striking color change from green to red during winter months due to anthocyanin synthesis in outermost mesophyll cells. Here we investigate three possible functions of this color change. • To test the hypothesis that anthocyanins function as light attenuators, maximum photosystem II efficiency ( Fv /Fm) of red and green leaves was measured during and after exposure to wavelengths either strongly or poorly absorbed by anthocyanin. To determine whether anthocyanins elevate radical-scavenging capacity, antioxidant activity of red and green leaves was assessed using the α,α-diphenyl-β-picrylhydrazyl assay. Nonstructural carbohydrate levels were analyzed to test the hypothesis that anthocyanins function as a carbon sink. • Declines in Fv /Fm under white and green light were significantly greater for green than red leaves, but were comparable under red light. Anthocyanin content positively correlated with antioxidant activity. Although levels of anthocyanins did not appear to be related to nonstructural carbohydrate concentration, high levels of sugars may be necessary for their photoinduction. • Results suggest that anthocyanins function as light attenuators and may also contribute to the antioxidant pool in winter leaves. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of New Phytologist is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1111/j.1469-8137.2005.01546.x
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        Text: English
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      – SubjectFull: Antioxidants
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