THE ANATOMY OF THE ROOT SYSTEM IN YAM BEAN, PACHYRHIZUS EROSUS (L) URBAN (FABACEAE)

S. Dabydeen and G. Sirju-Charran

No 259985, 25th Annual Meeting, July 1-6, 1989, Gosier, Guadeloupe from Caribbean Food Crops Society

Abstract: Investigations have revealed that the anatomy of the primary radicular root was typically dicotyledonous except that the metaxylem was not completely developed centripetally. Most of the roots had tetrarch xylem although a few pentarch conditions were observed. Tuberization was initiated by the formation of the vascular cambium which divided to form secondary tissues in a normal fashion. Later on, anomalous secondary and tertiary cambia developed around vessel elements and these produced mostly parenchyma storage cells. Activity of this anomalous secondary cambia thickening was chiefly responsible for the growth of the mature tuber. ----- Des études ont révélé que l'anatomie de la première racine radiculaire était du type dicotylédone excepté que le métaxylème n'était pas développé entièrement de façon centripète. La plupart des racines avaient un xylème tétrarche bien que quelques cas de pentarchie aient été observés. La tubérisation était initiée par la formation d'un cambium vasculaire qui se divise pourformerdes tissus secondaires normaux. Plus tard, des cambiums anormaux secondaires et tertiaires se développent autour des éléments des vaisseaux et produisent principalement des cellules de stockage du parenchyme. L'activité de cet épaississement des cambiums anormaux secondaires est responsable du grossissement du tubercule adulte.

Keywords: Crop Production/Industries; Research and Development/Tech Change/Emerging Technologies (search for similar items in EconPapers)
Pages: 13
Date: 1989-07-01
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Persistent link: https://EconPapers.repec.org/RePEc:ags:cfcs89:259985

DOI: 10.22004/ag.econ.259985

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