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Type: Journal article
Title: The role of molybdenum in agricultural plant production
Author: Kaiser, B.
Fitzpatrick, K.
Brady, J.
Phillips, T.
Tyerman, S.
Citation: Annals of Botany, 2005; 96(5):745-754
Publisher: Oxford Univ Press
Issue Date: 2005
ISSN: 0305-7364
Statement of
Brent N. Kaiser, Kate L. Gridley, Joanne Ngaire Brady, Thomas Phillips, and Stephen D. Tyerman
Abstract: Background: The importance of molybdenum for plant growth is disproportionate with respect to the absolute amounts required by most plants. Apart from Cu, Mo is the least abundant essential micronutrient found in most plant tissues and is often set as the base from which all other nutrients are compared and measured. Molybdenum is utilized by selected enzymes to carry out redox reactions. Enzymes that require molybdenum for activity include nitrate reductase, xanthine dehydrogenase, aldehyde oxidase and sulfite oxidase. Scope: Loss of Mo-dependent enzyme activity (directly or indirectly through low internal molybdenum levels) impacts upon plant development, in particular, those processes involving nitrogen metabolism and the synthesis of the phytohormones abscisic acid and indole-3 butyric acid. Currently, there is little information on how plants access molybdate from the soil solution and redistribute it within the plant. In this review, the role of molybdenum in plants is discussed, focusing on its current constraints in some agricultural situations and where increased molybdenum nutrition may aid in agricultural plant development and yields. Conclusions: Molybdenum deficiencies are considered rare in most agricultural cropping areas; however, the phenotype is often misdiagnosed and attributed to other downstream effects associated with its role in various enzymatic redox reactions. Molybdenum fertilization through foliar sprays can effectively supplement internal molybdenum deficiencies and rescue the activity of molybdoenzymes. The current understanding on how plants access molybdate from the soil solution or later redistribute it once in the plant is still unclear; however, plants have similar physiological molybdenum transport phenotypes to those found in prokaryotic systems. Thus, careful analysis of existing prokaryotic molybdate transport mechanisms, as well as a re-examination of know anion transport mechanisms present in plants, will help to resolve how this important trace element is accumulated.
Keywords: Molybdenum; molybdate transport; nitrate reductase; Moco; Vitis vinifera; Merlot; Millerandage; sulfate transport; nitrogen fixation; nitrogen metabolism; plant nutrition
RMID: 0020051007
DOI: 10.1093/aob/mci226
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Appears in Collections:Agriculture, Food and Wine publications

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