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Methods for the study of nitrogen assimilation and transport in grain legumes

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Summary

The study of nitrogen assimilation and transport in grain legumes is a necessary preliminary to selecting plant cultivars for breeding programs aimed at increasing the contribution of nitrogen fixation to plant production and seed yield. Methods used in such studies are spread widely throughout the literature and have not always been sufficiently tested. This paper presents a comprehensive set of reliable techniques particularly adapted for use in laboratories in developing countries which lack sophisticated and expensive instruments. A continuous flow system for the measurement of N2 fixation (acetylene reduction) using simple and inexpensive components is described, as are techniques for the estimation of nodule respiration, hydrogen evolution and plant nitrate reductase activity. A number of colorimetric techniques have been adapted for the analysis of nitrate-, amino-, amide-, ureide- and total-N in small volumes of xylem (bleeding) sap.

Résumé

L'étude de l'assimilation et du transport de l'azote dans les légumineuses à graines est une nécessité préliminaire pour la sélection des cultivars destinés aux croisements visant à accroître la fixation de l'azote pour la croissance des plantes et le rendement en graines. Les méthodes employées pour ces études sont éparpillées dans la littérature et n'ont pas été suffisamment testées. Dans cet article, il est présenté une étude d'ensemble de méthodes fiables, particulièrement adaptées aux laboratoires des pays en voie de développement qui ne di sposent pas d'instrumentation sophistiquée et coûteuse. Il est notamment décrit un système simple et peu onéreux de flux continu pour mesurer la fixation de l'azote par réduction de l'acétylène, ainsi que des techniques pour déterminer la respiration des nodules, le dégagement d'hydrogéne et l'activité nitrate-réductase des plantes. Plusieurs techniques colorimétriques ont été adaptées à l'analyse de l'azote nitrique, aminé, uréidique et total, dans de faibles volumes de suc de xylème prélevé par saignée.

Resumen

El estudio de la asimilación y del transporte de nitrógeno en leguminosas de grano es un preámbulo necesario para la selección de cultivares obtenidos en programas de mejora que tengan como objetivo el incremento de la contribución de la fijación de nitrógeno a la producción de plantas y de semillas. Los métodos utilizados en dichos estudios estan dispersos en la literatura y no siempre se han comprobado lo suficiente. Este trabajo presenta un amplio conjunto de técnicas seguras, que se adaptan particularmente bien para su uso en laboratorios de países en desarrollo que carecen de instrumental caro y sofisticado. Se describe un sistema de flujo continuo para la medida de la fijación de N2 (reducción de acetileno) que utiliza componentes sencillos y baratos, tembién se describen técnicas para estimar la respiración de los nódulos, la evolución del hidrógeno y la actividad nitratò-reductasa de la planta. Se han adaptado varios métodos colorimétricos para el análisis del Nitrógeno total y del Nitrógeno combinado (en forma de aminas, amidas y derivados de la urea) contenidos en pequeños volumenes de savia bruta (xilema).

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Boddey, R.M., Pereira, J.A.R., Hungria, M. et al. Methods for the study of nitrogen assimilation and transport in grain legumes. Mircen Journal 3, 3–22 (1987). https://doi.org/10.1007/BF01090491

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