Photosynthetica 1998, 35(3):391-398 | DOI: 10.1023/A:1006964302422

The Substrate Utilization and Concentration of 14C Photosynthates in Citronella under Fe Deficiency

N.K. Srivastava1, A. Misra1, S. Sharma1
1 Central Institute of Medicinal and Aromatic Plants, Lucknow, India

Changes in the utilization pattern of primary substrate, viz. [U-14C] acetate, 14CO2 and [U-14C] saccharose, and the contents of 14C fixation products in photosynthetic metabolites (sugars, amino acids, and organic acids) were determined in Fe-deficient citronella in relation to the essential oil accumulation. There was an overall decrease in photosynthetic efficiency of the Fe-deficient plants as evidenced by lower levels of incorporation into the sugar fraction and essential oil after 14CO2 had been supplied. When acetate and saccharose were fed to the Fe-deficient plants, despite a higher incorporation of label into sugars, amino acids, and organic acids, there was a lower incorporation of these metabolites into essential oils than in control plants. Thus, the availability of precursors and the translocation to a site of synthesis/accumulation, severely affected by Fe deficiency, is equally important for the essential oil biosynthesis in citronella.

Additional key words: acetate; amino acids; 14CO2; Cymbopogon winterianus; oil; organic acids; primary and secondary metabolites; sugars; [U-14C]; [U-14C] saccharose incorporation

Prepublished online: September 1, 1998; Published: January 1, 1998  Show citation

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Srivastava, N.K., Misra, A., & Sharma, S. (1998). The Substrate Utilization and Concentration of 14C Photosynthates in Citronella under Fe Deficiency. Photosynthetica, 35(3), 391-398. doi: 10.1023/A:1006964302422
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