Iron deficiency‐induced changes in the photosynthetic pigment composition of field‐grown pear ( Pyrus communis L) leaves

Iron deficiency‐induced changes in the photosynthetic pigment composition of field‐grown pear... ABSTRACT In this work we characterize the changes induced by iron deficiency in the pigment composition of pear (Pyrus communis L.) leaves grown under high light intensities in field conditions in Spain. Iron deficiency induced decreases in neoxanthin and β‐carotene concomitantly with decreases in chlorophyll a, whereas lutein and carotenoids within the xanthophyll cycle were less affected. Iron deficiency caused major increases in the lutein/chlorophyll a and xanthophyll cycle pigments/chlorophyll a molar ratios. The chlorophyll a/chlorophyll b ratio increased in response to iron deficiency. The carotenoids within the xanthophyll cycle in iron‐deficient and in iron‐sufficient (control) leaves underwent epoxidations and de‐epoxidations in response to ambient light conditions. In control leaves dark‐adapted for several hours, most of the xanthophyll cycle pigment pool was in the epoxidated form vio‐laxanthin, whereas iron‐deficient leaves had significant amounts of zeaxanthin. Iron‐deficient leaves also exhibited an increased non‐photochemical quenching, supporting the possibility of a role for pigments within the xanthophyll cycle in photoprotection. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Plant Cell & Environment Wiley

Iron deficiency‐induced changes in the photosynthetic pigment composition of field‐grown pear ( Pyrus communis L) leaves

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Publisher
Wiley
Copyright
Copyright © 1994 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0140-7791
eISSN
1365-3040
DOI
10.1111/j.1365-3040.1994.tb02013.x
Publisher site
See Article on Publisher Site

Abstract

ABSTRACT In this work we characterize the changes induced by iron deficiency in the pigment composition of pear (Pyrus communis L.) leaves grown under high light intensities in field conditions in Spain. Iron deficiency induced decreases in neoxanthin and β‐carotene concomitantly with decreases in chlorophyll a, whereas lutein and carotenoids within the xanthophyll cycle were less affected. Iron deficiency caused major increases in the lutein/chlorophyll a and xanthophyll cycle pigments/chlorophyll a molar ratios. The chlorophyll a/chlorophyll b ratio increased in response to iron deficiency. The carotenoids within the xanthophyll cycle in iron‐deficient and in iron‐sufficient (control) leaves underwent epoxidations and de‐epoxidations in response to ambient light conditions. In control leaves dark‐adapted for several hours, most of the xanthophyll cycle pigment pool was in the epoxidated form vio‐laxanthin, whereas iron‐deficient leaves had significant amounts of zeaxanthin. Iron‐deficient leaves also exhibited an increased non‐photochemical quenching, supporting the possibility of a role for pigments within the xanthophyll cycle in photoprotection.

Journal

Plant Cell & EnvironmentWiley

Published: Oct 1, 1994

References

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