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Abstract

Leucoena leucocephala is cconomically an important plant. Seeds collected i0m 140 diflerent populations of L. leucocephala responded dilferently to metal treatments. Germination of L leucocephala showed significant (pc0.05) effect when treated with 25, 50. 75 and 100 ug*' of Pb and Cd individually and in combination. It was observed that Cd was more toxic than Pb on all measured variables. With increasing concentrations of Pb and Cd. the rate of seed germination was reduced for seeds collected from the polluted area. Cd treatment at 100 g* caused a significant reduction in root growth for seeds collected from the polluted area. Al combined treatments, the seed germination and seedling growth decreased than individual treatments of Pb and Cd. The seeds of L leucocephala collected from the polluted area caused significant (pc0.05) reduction in shoot length at combined treatment of 100 ug** Pb and Cd. Reduction in seed germination and seedling growth at 25 ag** of Pb treatment for seeds collected from the polluted area was also observed. Increased in concentration of Pb upto 75 ug** suppressed root length for seeds collected from the polluled area. Root growth was greatly reduced due to heavy metals than shoot growth. The shoot length of L. leucocephala showed a significant reduction in combined treatment at 50 pg*'Pb + 50 ug* Cd, than individual treatment af Po and Cd

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