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    • Sucrose mobilization in relation to essential oil biogenesis during palmarosa (Cymbopogon martinii Roxb. Wats. var.motia) inflorescence development

      Vinod Shanker Dubey Ritu Bhalla Rajesh Luthra

      Volume 28 Issue 4 June 2003 pp 479-487

    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/jbsc/028/04/0479-0487

    • Keywords

       

      Cymbopogon martinii ; essential oil; inflorescence; palmarosa; sucrose metabolism

    • Abstract

       

      Palmarosa inflorescence with partially opened spikelets is biogenetically active to incorporate [U-14C]sucrose into essential oil. The percent distribution of14C-radioactivity incorporated into geranyl acetate was relatively higher as compared to that in geraniol, the major essential oil constituent of palmarosa. At the partially opened spikelet stage, more of the geraniol synthesized was acetylated to form geranyl acetate, suggesting that majority of the newly synthesized geraniol undergoes acetylation, thus producing more geranyl acetate.In vitro development of palmarosa inflorescence, fed with [U-14C]sucrose, resulted in a substantial reduction in percent label from geranyl acetate with a corresponding increase in free geraniol, thereby suggesting the role of an esterase in the production of geraniol from geranyl acetate. At time course measurement of14CO2 incorporation into geraniol and geranyl acetate substantiated this observation. Soluble acid invertase was the major enzyme involved in the sucrose breakdown throughout the inflorescence development. The activities of cell wall bound acid invertase, alkaline invertase and sucrose synthase were relatively lower as compared to the soluble acid invertase. Sucrose to reducing sugars ratio decreased till fully opened spikelets stage, concomitant with increased acid invertase activity and higher metabolic activity. The phenomenon of essential oil biosynthesis has been discussed in relation to changes in these physiological parameters.

    • Author Affiliations

       

      Vinod Shanker Dubey1 Ritu Bhalla1 2 Rajesh Luthra1 3

      1. Neurobiotechnology Center, The Ohio State University, Columbus, Ohio - 43210, USA
      2. Plant Microbes Interaction Lab, Department of Biological Sciences, National University of Singapore - 117604, Singapore
      3. CSIR Complex, Dr K S Krishnan Marg, Pusa, New Delhi - 110 012, India

    • Dates

       
      Published
      June 2003
      Manuscript received
      16 September 2002
      Accepted
      17 February 2003

  • Journal of Biosciences | News

      Forthcoming Special issue.


    • To trigger further research on plant mitochondria, the Journal of Biosciences is bringing out a special issue titled "Plant Mitochondria: Properties and Interactions with Other Organelles".


      Plant mitochondria are quite distinct and have unique features, such as a cyanide-insensitive alternate pathway. They also interact with chloroplasts to optimize photosynthetic carbon assimilation.


      Submissions are welcome until 30 July 2023. The contributions can be original articles, short communications, reviews, or mini-reviews on any topic related to plant mitochondria.


      Authors can submit their articles online at https://www.editorialmanager.com/jbsc/default2.aspx

      Posted on April 12, 2023
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