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Articles by Nadia Munir
Total Records ( 2 ) for Nadia Munir
  S. Shahid Shaukat , Nadia Munir and Imran A. Siddiqui
  The effects of Conyza canadensis (L.) Cronquist on seed germination and early seedling growth of six test plants namely tomato, radish, wheat, corn, millet and mungbean was investigated. Aqueous extract of C. canadensis at different concentrations (25, 50, 75 and 100% stock solution) inhibited the germination, root and shoot growth of all the six test species. Germination was reduced by the shoot extract in the order: tomato > radish > millet = corn > mungbean > wheat. Both root and shoot growth of the test species were reduced to varying degree and shoot growth was usually affected to a greater degree than the root growth, particularly in tomato. Decaying shoot of C. canadensis in sandy-loam at 5, 10 and 20 g/ 400 g soil substantially inhibited germination and seedling growth of bulrush millet (Pennisetum americanum) at all the dosages and no germination occurred at the highest dosage (20 g/400 g soil). Bioassay of the ether extract of C. canadensis disclosed two significant zones of inhibition at Rf values of 0.2-0.3 3 and 0.7-0.8. Chromatography for the phenolics revealed the presence of four phenolic compounds: gallic acid, vanillic acid, catechol and syringic acid.
  S.S. Shaukat , I.A. Siddiqui and Nadia Munir
  The study was carried out during June-September 2001 at the Department of Botany, University of Karachi. Present investigation concluded that aqueous extract of Conyza canadensis had no significant impact on egg hatch of Meloidogyne javanica in vitro. However, aqueous extract of C. canadensis caused considerable mortality of M. javanica juveniles at 24 h but not at 48 h. Ethanolic extract of powdered shoot of C. canadensis did not exert any inhibitory effect on radial growth of root-infecting fungi including Macrophomina phaseolina, Fusarium solani and Rhizoctonia solani in vitro. Soil amendment with powdered shoot of C. canadensis at 5% concentration significantly reduced galling due to M. javanica in mungbean roots grown in non-sterilized soil but not in sterilized soil. C. canadensis at 2.5% concentration did not affect root-knot development in either of the soil types tested. Soil amendment with 5% C. canadensis in non-sterilized soil markedly reduced plant height and fresh weight of mungbean shoots. Fresh root weights were markedly lowered, in both sterilized and non-sterilized soil, amended with 5% C. canadensis. C. canadensis suppresses root-knot nematode disease indirectly by enhancing soil microbial assemblages, particularly the microfungi antagonistic to root-knot nematodes.
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