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Effects of cotyledons and nitrate on the nitrogen assimilation ofPhaseolus vulgaris

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Summary

In an experiment performed under greenhouse conditions usingPhaseolus vulgaris cv. ‘Carioca’ inoculated withRhizobium strain CO5, effects of cotyledons and mineral nitrogen on the initial process of nitrogen assimilation were evaluated. Plants were maintained intact or had either both or half of both cotyledons removed six days after planting. Levels of mineral nitrogen corresponded to the addition of 0 or 1.5 mg N/plant/day three days before each of the four harvests (8, 10, 12 and 14 days after planting). Cotyledon removal generally decreased nodule number and dry weight and total nitrogenase activity, although there was no effect on specific nodule efficiency, but the nitrate reductase activity was increased in both shoots and roots. Mineral nitrogen decreased nodulation and nitrogenase activity when applied 9 and 11 days after planting, but increased shoot and root nitrate reductase activity and total nitrogen incorporation, indicating that plants could be nitrogen limited during the initial period of growth.

Résumé

Dans une expérimentation réalisée dans les conditions de serre au moyen dePhaseolus vulgaris cv Carioca inoculée avec la souche CO5 deRhizobium, on a évalué les effets de cotylédons et de l'azote minéral sur le processus initial de l'assimilation azotée. Les plants ont été soit maintenus intacts soit amputés des deux ou de la moitié des deux cotylédons, 6 jours après la plantation. Les teneurs en azote minéral correspondaient à l'ajout de 0 ou 1.5 mg d'azote par plant et par jour, trois jours avant chacune des 4 récoltes (8, 10, 12 et 14 jours après la plantation). L'amputation de cotyledon diminue d'une manière générale le nombre de nodules, le poids sec et l'activité totale de nitrogénase, bien qu'il n'y ait aucun effet sur l'efficience spécifique de nodule mais l'activité de nitrate réductase était augmentée tant dans les pousses que dans les racines. L'azote minéral a déterminé la nodulation et l'activité de nitrogénase lorsque l'application avait lieu les 9ème et 11ème jours après la plantation, mais elle a augmenté l'activité de nitrate réductase chez les pousses et les racines ainsi que l'incorporation totale d'azote, indiquant par là que la plante pouvait être limitée en azote durant la période initiale de croissance.

Resumen

En un experimento realizado en invernadero conPhaseolus vulgaris, cv. Carioca, inoculado conRhizobium (cepa CO5) fue evaluado los efectos de los cotiledones y del nitrógeno mineral en el proceso inicial de la assimilación de N. Las plantas fueron mantenidas intactas o con la mitad o todos los cotiledones retirados a los 6 dias despues de la siembra (DDS). El N mineral fue aplicado en la dosis de 0 ó 1.5 mg N/planta/dia, 3 dias antes de cada una de los 4 casechas realizadas (8, 10, 12 y 14 DDS). La retirada de los cotiledones generalmente disminuyó el número y el peso seco de los nódulos y la actividad de la nitrogenase, mas não hubo influencia en la eficiencia específica de los nódulos. La actividad de la nitrato reductasa aumentó tanto en la parte aérea como en las raíces. El nitrógeno mineral disminuyó la nodulación y la actividad de la nitrogenasa cuando la aplicación ocurrió a los 9 y 11 DDS, mas aumentó la actividad de la nitrato reductasa de las raíces y de la parte aérea, asi como el contenido de N en la planta, indicando que estas podrian estar limitadas por nitrógeno en la fase inicial de crescimento.

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Hungria, M., Thomas, R.J. Effects of cotyledons and nitrate on the nitrogen assimilation ofPhaseolus vulgaris . Mircen Journal 3, 411–419 (1987). https://doi.org/10.1007/BF00935699

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