Effect of seed position on parental plant on seed germination and seedling growth of common cocklebur (Xanthium strumarium L.)

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Research Paper 01/10/2013
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Effect of seed position on parental plant on seed germination and seedling growth of common cocklebur (Xanthium strumarium L.)

Rouhollah Amini, Sahar Izadkhah
J. Bio. Env. Sci.3( 10), 123-129, October 2013.
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The aim of this study was to determine the effect of seed position on a parental plant on germination characteristics and early seedling growth of common cocklebur (Xanthium strumarium L.). The laboratory experiment was conducted in laboratory of weed ecology of Faculty of Agriculture, University of Tabriz, Iran in 2012. The common cocklebur seeds were harvested from different seed positions and height of parental plants. The experiment was arranged based on complete randomized design with four replications. Treatments consisted of three seed positions of common cocklebur parental plant (the bottom, middle and top of the canopy). Germination percentage, germination rate, shoots and root dry weight and shoots and root length were assessed. The results showed that middle position of seed on parental plant had higher germination percentage (67%) in comparison to other seed position on parental plant. Middle position of parental plant by 4.67 day-1 had the highest germination rate than that of other parts. Also, seeds of lower position of parental plant had higher germination rate in compared to upper position. In comparison to other parts of parental plant canopy layers, middle position had the highest shoot and root length and dry weight. A combination of reproductive traits such as high fecundity, high germination capacity and opportunistic behaviour associated with limited effect of fruit position on a plant on germination characteristics could affect on ability of this weed to successfully invade new habitats.


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