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ALLELOPATHIC EFFECT OF ROOT EXUDATES OF WHEAT CULTIVARS ON COMPANION WEEDS | ||
| IRAQ JOURNAL OF AGRICULTURE | ||
| Article 1, Volume 21, Issue 1, 2016, Pages 0-0 | ||
| Authors | ||
| A. A. Albehadili; I. S. Alsaadawi; R. K. Shaty | ||
| Abstract | ||
| The first field experiment was conducted during 2013-2014 season at the Research Farm of Department of Biology, College of science, Baghdad University to test if the variation in weed population and growth in stands of wheat cultivars was due in part to allelopathic mechanism. The experiment was conducted in a randomized complete block design (RCBD) with four replications. Results revealed that Abu Ghraib significantly reduced weed density by 62, 48, 46 and 44% and weed dry weight by 66, 72, 60 and 47% after 60, 75, 95 and 115 days from planting, respectively, followed by Iraq and al-Rasheed cultivars. Cultivar Tahaddi showed the lest inhibitory effect to weeds. Subsequent stair-case experiment indicated that root exudates of the Abu-Graib 3 cultivar suppressed the test weeds (Malva and wild oat) more than Tahaddi cultivars giving additional evidence that allelopathic mechanism is involved in weed suppression and the differences in the inhibitory activity between the test cultivars was due to differences in their allelopathic potential. Chemical analysis indicated the presence of phenolics in root exudates of both cultivars (Abu-Graib3and Tahaddi) Chemical analysis on these phenolics by HPLC indicated the presence of several allelochemicals, viz, p-hydroxybenzoic, protocatecheuic, vanillic, p-coumaric acid ,ferulic acid, sinapic acid and syringic acid with higher concentration in Abu-Graib3 cultivars compare to Tahaddi cultivar. | ||
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