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Plant Growth Regulation

, Volume 40, Issue 2, pp 107–115 | Cite as

Tamarindus indica L. leaf is a source of allelopathic substance

  • Syeda Shahnaz Parvez
  • Mohammad Masud Parvez
  • Eiji Nishihara
  • Hiroshi Gemma
  • Yoshiharu Fujii
Article

Abstract

The allelopathic potential of the Tamarindus indica L. leaf was investigated through bioassay guided studies using several weed and edible crop species. Both radicle and hypocotyl growth of all the plant species tested was strongly inhibited by the tamarind leaf using a sandwich method. The growth of weed species was reduced more than that of edible crop species. Among the weed species, barnyard grass followed by white clover, and in the edible crop species, lettuce followed by radish ranked top in terms of growth inhibition. Different concentrations of tamarind leaf crude water-soluble extract exhibited a strong inhibition in all the plant species tested and, by contrast, the magnitude of inhibition in the weed species was higher than in edible crop species and ranged from 30–75%. The 10% concentration of the tamarind leaf crude water-soluble extract was most potent against growth of seedlings. The concentrations of the nutrient components were linearly correlated with an increase in the concentration of tamarind leaf crude water-soluble extract. No significant changes in either pH or EC were found in the variations of different concentrations of tamarind leaf crude water-soluble extracts. As compared to control, growth of both radicle and hypocotyl in weed (barnyard grass and white clover) and in edible crop (lettuce and radish) species were significantly reduced when blended tamarind leaves at different concentrations were incorporated into the growth medium. The inhibitory magnitude increased with an increase in the concentration of the tamarind leaf. In terms of growth inhibition, among these tested plants, weed species particularly barnyard grass were most sensitive to the allelochemicals exuded from blended tamarind leaves. When the blended tamarind leaves were removed from the growth medium, all the seedlings grew quickly and the percentage of recovery was between 76–97% of the corresponding controls. Reduction in the fresh and dry weight of these 4 plant species was observed under the experimental conditions, and ranged between 33–42% and 40–53% in the radicle and hypocotyl, respectively. The fresh and dry weight, and total chlorophyll content declined significantly in the incorporated tamarind leaf treatments. Compared to the control, the highest drop in the chlorophyll content of 60% in barnyard grass was observed with the 10% concentration of the leaf treatment. These results clearly indicate that the tamarind leaf contains one or more strong biologically active allelochemical(s) that function as true growth regulator(s) and is involved in plant growth regulation, particularly in weed species.

Allelopathy Growth Inhibition Hypocotyl Radicle Sandwich Method Tamarind 

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Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Syeda Shahnaz Parvez
    • 1
    • 2
  • Mohammad Masud Parvez
    • 2
  • Eiji Nishihara
    • 2
  • Hiroshi Gemma
    • 1
  • Yoshiharu Fujii
    • 2
  1. 1.Laboratory of Pomology, Institute of Agriculture and ForestryUniversity of TsukubaTsukuba Science City, IbarakiJapan
  2. 2.Chemical Ecology UnitNational Institute for Agro-Environmental SciencesTsukuba Science City, IbarakiJapan

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