Phytotoxicity of aqueous extracts of lignum tree (Guaiacum officinale L.) against germination and seedling growth of wheat (Triticum aestivum L. var. Kiran)
2008
Khan, D. (Government National Coll., Karachi (Pakistan). Dept. of Botany) | Naqvi, S.H.N. (Government National Coll., Karachi (Pakistan). Dept. of Botany)
Aqueous extracts from various plant/litter components of Guaiacum officinale L. significantly inhibited germination of wheat (Triticum aestivum L.) except bark, which had very mild inhibitory effect. The degree of germination inhibition was proportional to the concentration of the extracts. Bark extract was the least inhibitory. Suppression of germination under influence of the extracts employed was in the following order of toxicity as - Pericarp greater than Flowers greater than Yellow leaves greater than Green leaves greater than Green fruits greater than Bark. Seedling growth in terns of plumule elongation, number of seminal roots, average length of seminal toot in a seedling, total length of seminal roots per seedling and the biomass accumulated over three days of incubation in seedlings per Petri plate indicated significant seduction in seedling performance under influence of the extracts of plant components such as abscised yellow leaves, abscised floral parts, pericarp of the dehisced fruits, and green leaves. The abscised yellow leaves and floral ports were the highly toxic litter components. Bark, on the other hand had no inhibitory effect on seedling growth - rather it simulated the plumular growth significantly. Extract of green fruit had very mild inhibitory effects on wheat seedlings.
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