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Plants 2015, 4(4), 756-772; doi:10.3390/plants4040756

Leaf Senescence by Magnesium Deficiency

Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan
These authors contributed equally to this work.
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Academic Editor: Salma Balazadeh
Received: 4 August 2015 / Revised: 11 November 2015 / Accepted: 2 December 2015 / Published: 11 December 2015
(This article belongs to the Special Issue Plant Senescence)
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Abstract

Magnesium ions (Mg2+) are the second most abundant cations in living plant cells, and they are involved in various functions, including photosynthesis, enzyme catalysis, and nucleic acid synthesis. Low availability of Mg2+ in an agricultural field leads to a decrease in yield, which follows the appearance of Mg-deficient symptoms such as chlorosis, necrotic spots on the leaves, and droop. During the last decade, a variety of physiological and molecular responses to Mg2+ deficiency that potentially link to leaf senescence have been recognized, allowing us to reconsider the mechanisms of Mg2+ deficiency. This review focuses on the current knowledge about the physiological responses to Mg2+ deficiency including a decline in transpiration, accumulation of sugars and starch in source leaves, change in redox states, increased oxidative stress, metabolite alterations, and a decline in photosynthetic activity. In addition, we refer to the molecular responses that are thought to be related to leaf senescence. With these current data, we give an overview of leaf senescence induced by Mg deficiency. View Full-Text
Keywords: leaf senescence; magnesium deficiency; transpiration leaf senescence; magnesium deficiency; transpiration
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Tanoi, K.; Kobayashi, N.I. Leaf Senescence by Magnesium Deficiency. Plants 2015, 4, 756-772.

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