Allelopathic Effect of Sunflower on Crops and Pathogens

Helianthus annus L. is a powerful allelopathic plant and contains significant allelochemicals with well-known allelopathic potential against plants.In this research work, the extracts were collected in freshwater, methanolic and desiccated air from seeds and roots.The seedlings of wheat (Triticum aestivum L.) and lettuce (Lactuca sativa) were treated with those extracts.Our results showed that extracts from the seed and root pose a major effect on the germination of seed, development & arid biomass of wheat and lettuce seedlings.Moreover, the seed extract of H. annus affected growth parameters of T. aestivum and L. sativa than that of root exudates.Similarly, the methanolic extracts of seeds and roots have remarkably reduced root growth in T. aestivum and L. sativa seedlings.From the data, it is speculated that the allelochemicals of sunflower repressed the wheat and lettuce seedlings' growth, which might have resulted from various cellular processes responsible for reduced plant growth.

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