Paper Information

Journal:   PLANT AND ECOSYSTEM   WINTER 2014 , Volume 9 , Number 37; Page(s) 113 To 126.
 
Paper: 

INVESTIGATING THE ALLELOPATHIC EFFECT OF DIFFERENT WEED SPECIES ON THE GERMINATION AND GROWTH OF WHEAT SEEDLINGS

 
 
Author(s):  LAK SH., GHOOSHCHI F., SAFAHANI LANGEROUDI A.R.*, SOLTANI S.
 
* DEPARTMENT OF AGRONOMY, QAEMSHAR BRANCH, ISLAMIC AZAD UNIVERSITY, QAEMSHAR, IRAN
 
Abstract: 

To investigate the allelopathic effects of six weed species (i.e., Conyza bonariensis, Acroptilon repens, Artemisia annua, Inula graveolense, Solanum nigrum, and Xanthium strumarium) on the germination and growth of wheat seedlings, an experiment was carried out on Triticum aestivum L. in the laboratory and greenhouse of the Gorgan University of Agricultural Sciences and Natural Resources in 2009 with a complete randomized design and three replications. The impact of the shoot extracts obtained from common plant species (i.e. Xanthium strmarium, Acroptilon repens and Conyza bonariensis) in the fields and rangeslands of Golestan province on the reduction of wheat seed germination under laboratory conditions was determined. The analyzed indices included: the percent of wheat seed germination at different times after the implantation, shoot dry weight, root dry weight in the seedlings at the end of each experiment. The results indicated that the shoot extracts of Xanthium strmarium, Acroptilon repens and Conyza bonariensis significantly reduced the wheat seed germination to 42%, 47%, and 20%, respectively, in comparison to the control. The allelopathic effects of the remaining and extracts in Acroptilon repens and Xanthium strmarium on germination and the growth of wheat seedlings were significant and resulted in a significant decrease in the percent of germination, root length, coleoptile length, and dry weight of shoot in wheat. Generally speaking, in comparison to shoot organs, wheat roots appeared more sensitive to the extracts. On the other hand, the shoot extracts were more phytotoxic compared to the root extracts. It was concluded that the extracts and remainings of three abovementioned plant types caused a decrease in the germination, root length, coleoptile length, and dry weight of root in the seedlings of wheat. It was also observed that the dry weight of root was more significantly affected. The results indicated that the extracts of Acroptilon repens have significant allelopathic effects which can be applied in the production of biological herbicides.

 
Keyword(s): WHEAT (TRITICUM AESTIVUM L.), ALLELOPATHY, SEED GEMINATION, SEEDLING GROWTH
 
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