Phytotoxic Impact of Mesquite (Prosopis juliflora) Pericarps on Seed Germination and Seedling Growth of Lettuce (Lactuca sativa)

Mohamed Osman A, Warrag and Essam I, None Warrag
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Abstract

Phytotoxic effects of mesquite (Prosopis juliflora) pericarps onseed germination and seedling growth of lettuce (Lactuca sativa) wereinvestigated. Aqueous extracts of 10, 20, 30, 40, 50 and 60 g of drymesquite pericarps in a litre of distilled water were used. Final seedgermination percentage and germination rate, evaluated with correctedgermination rate index, and days to 50% of the final seed germination,were significantly reduced. Likewise were the radicle and the hypocotyllengths, five days after germination. The magnitude of the reductionincreased with the increase of extract concentration. Mannitol solutionswith the same osmotic potential and pH as the aqueous extracts resulted insignificantly higher values of these traits than their correspondingextracts. This indicates that mesquite pericarp contains allelochemicalswhich could detrimentally affect seed germination and seedling growth oflettuce.
豆科豆皮对生菜种子萌发和幼苗生长的植物毒性影响
研究了豆科植物皮对生菜种子萌发和幼苗生长的毒性作用。每升蒸馏水中分别提取10、20、30、40、50和60克干梅子果皮的水提取物。最终种子发芽率和发芽率(用正确的发芽率指数评估)以及最终种子发芽率达到50%的天数显著减少。萌发5天后胚根和下胚轴的长度也有同样的变化。随着提取物浓度的增加,还原幅度增大。在相同渗透电位和pH值的甘露醇水溶液中,这些性状的数值均不显著高于相应的水溶液。这说明豆科植物果皮中含有对生菜种子萌发和幼苗生长有不利影响的化感物质。
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