CONSEQUENCES OF PURINE DEGRADATION INHIBITION INDUCED BY ALLOPURINOL ON GROWTH, NITROGENOUS COMPOUNDS AND CARBOHYDRATES IN YAM BEAN (Pachyrhizus erosus Urban)

Zinsou C. and G. Vansuyt

No 259983, 25th Annual Meeting, July 1-6, 1989, Gosier, Guadeloupe from Caribbean Food Crops Society

Abstract: Allopurinol effects on Xanthine dehydrogenase (XDH) and uricase, the key enzymes of conversion of fixed nitrogen in ureides (allantoin and allantoate), exporting forms of ammonia from nodules to leaves, where investigated on growth, amino-compounds and carbohydrates in yam bean. Allopurinol decreased XDH and uricase activities in the nodules. As a consequence, ureides dropped down in nodules, tubers, stems and leaves. Aminocompounds declined in nodules and leaves but not in tubers or stems. Proteins were unaffected. Allopurinol also caused sucrose and starch accumulation in the nodules. In the tuber it did not affect sucrose level but decreased glucose, fructose and starch. The relationships between the enzyme activities, different metabolites and plant growth were discussed. ----- Les effets de Pallopurinol sur la Xanthine déshydrogénase (XDH)etl'uricase, les enzymes clés de la transformation de l'ammoniac en uréides (allantoine et allantoate), forme de transport d'azote chez le dolique tubéreux, ont été étudiés sur la croissance, les composés aminés et les glucides. Allopurinol réduit les activités Xanthine déshydrogénase et uricase dans les nodosités. Il s'ensuit une chute des uréides dans les nodosités, tubercules, tiges et feuilles. Les aminoacides baissent dans les nodosités et dans les feui'les mais pas dans les tubercules et dans les tiges. Les protéines restent inchangées. Allopurinol provoque l'accumulation de saccharose et de l'amidon dans les nodosités. Dans les tubercules il n'affecte pas le saccharose mais diminue le niveau du fructose et de l'amidon. Les relations entre les différents métabolites et la croissance des plantes sont discutées.

Keywords: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies (search for similar items in EconPapers)
Pages: 11
Date: 1989-07-01
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs89:259983

DOI: 10.22004/ag.econ.259983

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