Photosynthetica 2006, 44(3):478-480 | DOI: 10.1007/s11099-006-0055-0

Utilization of exogenously supplied 14C-saccharose into primary metabolites and alkaloid production in Catharanthus roseus

N. K. Srivastava1,*, A. K. Srivastava1
1 Central Institute of Medicinal and Aromatic Plants, P.O-CIMAP, Lucknow, India

Partitioning of exogenously supplied U-14C-saccharose into primary metabolic pool as sugars, amino acids, and organic acids was analyzed and simultaneous utilization for production of alkaloid by leaf, stem, and root in twigs and rooted plants of Catharanthus roseus grown in hydroponic culture medium was determined. Twigs revealed comparable distribution of total 14C label in leaf and stem. Stems contained significantly higher 14C label in sugar fraction and in alkaloids [47 kBq kg-1(DM)] than leaf. In rooted plants, label in 14C in metabolic fractions in root such as ethanol-soluble, ethanol-insoluble, and chloroform-soluble fractions and in components such as sugars, amino acids, and organic acids were significantly higher than in stems and leaves. This was related with significantly higher content of 14C in alkaloids in stems and leaves. 14C contents in sugars, amino acids, and organic acids increased from leaf to stem and roots. Roots are the major accumulators of metabolites accompanied by higher biosynthetic utilization for alkaloid accumulation.

Additional key words: amino acids; assimilate partitioning; leaf; organic acids; roots; stem; sugars

Received: January 12, 2006; Accepted: July 27, 2006; Published: September 1, 2006  Show citation

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Srivastava, N.K., & Srivastava, A.K. (2006). Utilization of exogenously supplied 14C-saccharose into primary metabolites and alkaloid production in Catharanthus roseus. Photosynthetica, 44(3), 478-480. doi: 10.1007/s11099-006-0055-0
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