PRELIMINARY INVESTIGATIONS ON INDIGENOUS STRAINS OF RHIZOBIUM NODULATING YAM BEAN (Pachyrhizus erosus Urban) IN GUADELOUPE

G. Vansuyt and C. Zinsou

No 259988, 25th Annual Meeting, July 1-6, 1989, Gosier, Guadeloupe from Caribbean Food Crops Society

Abstract: Yam bean plants formed efficient nodules with indigenous strains of Rhizobium living in vertisols (pH 8.4), in neutral ferralitic soils (pH 6.9) but not in.acid ferrallitic soils (pH 4.6). Mineral amendments imploying Urea, basic slag, lime incorporation in the acid soils overcome the pH inhibition of nodule formation. Rhizobium strains from the different soils were isolated and characterized. Apparent rate of growth (ARG) and rate of nodulation in gibson tubes (RNG) were determined. Their aptitude to use sugars and other compounds was assessed by API STAPH tests. The efficiency of the symbiosis of each strain of Rhizobium-Pachyrhizus was measured by estimating the biomass produced in gibson tubes and by determining carbohydrates, ureides and amino-compounds in the nodules of the plant. ----- Le dolique tubéreux forme des nodosités efficientes avec des souches de Rhizobium indigènes des vertisols (pH 8) et des sols ferralitiques neutres (pH 6.9). La nodulation est inexistante dans les sols ferralitiques acides (pH 4.6). L'incorporation des amendements minéraux (urée, scories de déphosphoration, chaux) capables d'élever le pH permet de lever l'inhibition de la formation des nodosités dans ces derniers sols. Les souches de Rhizobiumont été sélectionnées et caractérisées. Les vitesses de croissance apparente et de nodulation en tubes Gibson ont été déterminées. Leur aptitude à utiliser les sucres et d'autres composés ont été mis en évidence par les tests API STAPH. L'efficience de chaque souche a été estimée par la matière organique produite en tubes Gibson, les quantités de sucres solubles, d'uréides, et composés aminés des nodosités.

Keywords: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies (search for similar items in EconPapers)
Pages: 12
Date: 1989-07-01
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs89:259988

DOI: 10.22004/ag.econ.259988

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