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Acta Physiologiae Plantarum

, Volume 30, Issue 3, pp 401–405 | Cite as

Caffeine affects adventitious rooting and causes biochemical changes in the hypocotyl cuttings of mung bean (Phaseolus aureus Roxb.)

  • Daizy R. Batish
  • Harminder Pal Singh
  • Mansimran Kaur
  • Ravinder Kumar Kohli
  • Surender Singh Yadav
Short Communication

Abstract

Caffeine (1,3,7-trimethylxanthine), a purine alkaloid found naturally in over 100 plant species, has recently been viewed as a safe chemical for management of pests including molluscs, slugs, snails, bacteria, and as a bird deterrent. It possesses phytotoxicity against plant species, yet the mechanism of action is lacking. A study was conducted to determine the effect of caffeine on the rooting of hypocotyl cuttings of mung bean (Phaseolus aureus) and the associated biochemical changes. At lower concentrations (<1,000 μM) of caffeine, though rooting potential was not affected, yet there was a significant decrease in the number of roots and root length. At 1,000 μM caffeine, there was a 68% decrease in the number of roots/primordia per cutting, whereas root length decreased by over 80%. However, no root formation occurred at 2,000 μM caffeine. Further investigations into the biochemical processes linked to root formation revealed that caffeine significantly affects protein content, activities of proteases, polyphenol oxidases (PPO) and total endogenous phenolic (EP) content, in the mung bean hypocotyls. A decrease in rooting potential was associated with a drastic reduction in protein content in the lower rooted portion, whereas the specific activity of proteases increased indicating that caffeine affects the protein metabolism. Activity of PPO decreased in response to caffeine, whereas EP content increased significantly indicating its non-utilization and thus less or no root formation. Respiratory ability of rooted tissue, as determined through TTC (2,3,5-triphenyl tetrazolium chloride) reduction, was impaired in response to caffeine indicating an adverse effect on the energy metabolism. The study concludes that caffeine interferes with the root development by impairing protein metabolism, affecting activity of PPO (and thus lignification), and EP content, which are the crucial steps for root formation.

Keywords

Cellular respiration Protease activity Protein content Polyphenol oxidase activity Total endogenous phenolic content 

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Copyright information

© Franciszek Górski Institute of Plant Physiology, Polish Academy of Sciences, Kraków 2008

Authors and Affiliations

  • Daizy R. Batish
    • 1
  • Harminder Pal Singh
    • 2
  • Mansimran Kaur
    • 1
  • Ravinder Kumar Kohli
    • 1
    • 2
  • Surender Singh Yadav
    • 1
  1. 1.Botany DepartmentPanjab UniversityChandigarhIndia
  2. 2.Centre for Environment and Vocational StudiesPanjab UniversityChandigarhIndia

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