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1 - Introduction

Published online by Cambridge University Press:  10 December 2009

Umesh C. Gupta
Affiliation:
Agriculture and Agri-Food Canada Research Centre
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Summary

Molybdenum (Mo) is one of seven recently identified trace elements that are essential for plant growth. It is the only transition element in group VI in the periodic table that is essential for normal growth, metabolism, and reproduction of higher plants. The biological importance of Mo in plants is due to its highly beneficial action in the fixation of nitrogen, from the air, by the nitrogen-fixing bacterium (Azotobacter chroococcum). After the establishment of its essentiality by scientists in Australia more than half a century ago, its deficiency has been reported in several countries in a variety of crops. The agricultural researchers in Australia were able to overcome the symptoms of Mo deficiency in tomatoes (Lycopersicon esculentum Mill.) by addition of minute quantities of Mo in the nutrient solution. Some of the crops considered most sensitive to Mo deficiency are clovers (Trifolium subterraneum L.), cauliflower (Brassica oleracea var. botrytis L.), broccoli (Brassica oleracea L. Botrytis Group), rape (Brassica napus L.), beet (Beta vulgaris L.), spinach (Spinacea oleracea L.), lettuce (Lactuca saliva L.), and alfalfa (Medicago sativa L.).

Among the micronutrients, Mo is an exception in that it is readily translocated, and its deficiency symptoms generally appear on the whole plant. The deficiency symptoms for other micronutrients appear on the young leaves at the top of the plant because of their inability to translocate within the plant. Molybdenum deficiency emerges as general yellowing and stunting of the plant, interveinal mottling, and cupping of the older leaves, followed by necrotic spots at leaf tips and margins.

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Publisher: Cambridge University Press
Print publication year: 1997

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  • Introduction
  • Edited by Umesh C. Gupta, Agriculture and Agri-Food Canada Research Centre
  • Book: Molybdenum in Agriculture
  • Online publication: 10 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511574689.002
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  • Introduction
  • Edited by Umesh C. Gupta, Agriculture and Agri-Food Canada Research Centre
  • Book: Molybdenum in Agriculture
  • Online publication: 10 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511574689.002
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • Introduction
  • Edited by Umesh C. Gupta, Agriculture and Agri-Food Canada Research Centre
  • Book: Molybdenum in Agriculture
  • Online publication: 10 December 2009
  • Chapter DOI: https://doi.org/10.1017/CBO9780511574689.002
Available formats
×