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Articles by O.O. Otusanya
Total Records ( 3 ) for O.O. Otusanya
  O.O. Otusanya , O.W. Ikonoh and O.J. Ilori
  The study was carried out to evaluate the allelopathic effect of the fresh shoot aqueous extract (FSE) and water soluble root exudate (WRE) of Tithonia diversifolia (Hemsl) A. Gray on the germination, growth and chlorophyll content of pepper (Capsicum annum L. ) and tomato (Lycopersicon esculentum Mill.). The aqueous extract of the fresh shoot (FSE) of T. diversifolia did not affect the germination of L. esculentum seeds but significantly retarded germination of C. annum seeds at p<0.05. The plumule length of both crops and radicle length of C. annum were not affected while the latter parameter was significantly reduced at p<0.05 for L. esculentum. The water soluble root exudate of Tithonia diversifolia plants did not have any significant effect on the growth parameters of both test crops. However, chlorophyll b of C. annum was significantly inhibited at p<0.05 especially in the older plants while chlorophyll b and total chlorophyll of L. esculentum were significantly enhanced at p<0.05. Evidently, the concentration of allelochemicals in the T. diversifolia exudate and extract that was inhibitory to germination and chlorophyll b accumulation in C. annum was ineffective on germination of L. esculentum and stimulatory to its chlorophyll accumulation. The allelochemicals in T. diversifolia are therefore capable of performing a dual role. Their mode of actions differing depending on the associated plant species.
  O.J. Ilori , O.O. Otusanya , A.A. Adelusi and R.O. Sanni
  Helianthus annus, Chromolaena odorata and Tithonia diversifolia are weeds in the family Asteraceae. The present study was aimed to investigate the phytotoxic activities of these weeds on the seed germination and seedling growth of Vigna unguiculata. The seeds of the test crop were sown in petri dishes lined with filter paper moistened with the different aqueous extract prepared from the weeds while control received distilled water. The results showed that the germination and seedling growth of Vigna unguiculata were inhibited by the application of fresh leaf extract of Chromoleana odorata. All the different extracts inhibited the root length of the test plant. It was suggested that these weeds be controlled in the field where they grow in association with cultivated crops.
  O.O. Otusanya , A.A. Sokan-Adeaga and O.J. Ilori
  The allelopathic activity of the root exudates of Tithonia diversifolia on the germination, growth and chlorophyll contents of Amaranthus dubius L. and Solanum melongena L. plants were evaluated . The germination of both test crops, the shoot length and leaf area of A. dubius were significantly inhibited at p<0.05 while accumulation of chlorophyll was significantly enhanced at p<0.05. The root exudates had no significant effect on the growth and chlorophyll content of S. melongena. The study suggested that interaction with the target plant species affected the viability and biological activity of the allelochemicals released from the roots of the donor plant. The mode of action of the allelochemicals was target plant species dependent since the concentration threshold that would effect allelopathy differ from one target plant species to the other.
 
 
 
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