Effects of 2,4-D , DMBQ and sorghum root extract on haustorium induction and attachment of witchweed [Striga hermonthica (Del.) Benth.] to roots of Sorghum bicolor (L.) Moench

Awadallah B. Dafaallah, Abdalla M. Hamdoun, Abd Elgabar T. Babiker


Two types of experiments were conducted during 2006 in Wad Medani, Sudan in the laboratory. In vitro experiments were carried out to study the effects of 2,4-D at 2.5-100mM, 2,6-dimethoxy-ρ-benzoquinone at 2.5 and 10.0 mM and sorghum root extract at 6.3 and 25 g/L on haustorium induction of witchweed. In vivo experiments were carried out to study the effects of 2,4-D at 2,5-100mM for pre-conditioning and soaking pre-conditioned witchweed seeds at the same rate for 10-120 min on attachment of haustorium to sorghum seedling roots. Treatments were arranged in a completely randomized design with three replicates. Witchweed germilings were examined for haustorium induction and attachment 4 and 15 days after treatment. Data were collected, transformed to arcsine as required and subjected to the analysis of variance procedure. The results revealed that haustorium induction and attachment to sorghum seedling roots was suppressed with increased 2,4-D concentration(2.5-100mM) and soaking period (10-120 min) of pre-conditioned seeds. However, haustorium induction increased with increased 2,6-dimethoxy-ρ-benzoquinon (2.5 and10.0 mM) and sorghum root extract concentration (6.3 and 25g/L). Much remains to be learnt about the action of 2,4-D. It appears to have a potential for Witchweed management. However, further research is needed to clear the basic principles of 2,4-D actions on Witchweed.

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