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Fluridone Reveals Root Elongation Differences among Alfalfa Germplasms by Lynda L. Meyers; Michael P. Russelle; JoAnn F. S. Lamb is a Agricultural and Biological Sciences article available to read on EtoBox.

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Alfalfa (Medicago sativa L.) is a deep-rooted perennial that may be able to remove nitrate from subsoil beneath the rooting zone of annual crops. Alfalfa cultivars with rapid and deep root elongation would be beneficial for reducing future nitrate contamination of ground water supplies. The objectives of this research were to (i) develop a protocol using the herbicide fluridone {1-methyl-3-phenyl-5-[3-(trifluromethyl) phenyl]-4(1H)-pyridinone} as a marker for indicating alfalfa root penetration in soil, and (ii) determine the variability in rate of geotropi~ root elongation within and among diverse alfalfa germplasms. Fluridone caused rapid, distinctive bleaching of alfalfa leaves at a rate of 25 mg a.i. kg -1 soil, without being fatal. When transplanted after onset of fluridone symptoms, alfalfa recovered and resumed normal growth and flowering. Alfalfa populations did not differ in sensitivity to fluridone. Decomposition of roots from a fluridone-treated plant did not cause symptom development in other plants. Individual plants within alfalfa germplasms differed by 56 d in onset of symptoms, indicating a similar difference in root activity at 80 cm depth in soil. Mean geotropic r

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Author

Lynda L. Meyers; Michael P. Russelle; JoAnn F. S. Lamb

Publisher

The American Society of Agronomy; American Society of Agronomy; American Society of Agronomy, Inc.; Wiley; Springer Science and Business Media LLC (ISSN 0002-1962)

Published

1996

Language

EN

Field

Agricultural and Biological Sciences (Life Sciences)