PENGARUH TIMBAL DAN KADMIUM TERHADAP PERTUMBUHAN TANAMAN KEDELAI GLYCINE MAX (L.) MERR. )

• Main Author: Arisoesilaningsih, Endang
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/872
• Institution: Institut Teknologi Bandung

The effect of lead (Pb) and cadmium (Cd) treatment on vegetative growth of soybean (Glycine max (L.) Merr.) has been investigated using hydroponic culture. The results of this study demonstrate that Pb and Cd which were supplied in Rorison's solutions as PbEDTA and CdC12, respectively, induced toxicity symptoms on 17-day-old soybeans. Lead toxicity symptom appeared as interveinal chlorosis on the young leaves. Plants growing in solutions that received 45 or 85 ppm Pb during 18 days exhibited intoxication, and highly significant reduced root dry weight and leaf chlorophyll a content. In the presence of 100 and 300 ppm Pb on Petri dish, soybean seeds showed a.reduction in the percentage of germination. The same concentrations inhibited the secondary root development of the seedlings and chlorosis was found on the unifoliolate leaves. Cadmium toxicity symptoms appeared as reddish-brown spots on stem, petiole and along the veins of leaves, the leaves curled and vertically oriented, with reduced leaf angles, the shoot and young trifoliolate leaves became chlorotic and the plants were stunted. Cadmium treatment at 0.90 ppm caused intoxication of young soybean plants, gave a highly significant reduced plant height, plant dry weight and the chlorophyll content of young leaves. The percentage of germination of seeds was slightly reduced by Cd treatment at 1.0 and 9.0 ppm, but significantly inhibited epicotyl and seedling root development. Although Pb and Cd were accumulated in the shoot of seedling, the growth of hypocotyl and shoot biomass were not affected. Changes in accumulation of Mg and Fe in plants grown in the presence of excess Pb were observed, while Cd influenced the accumulation of Ca,Mg,Fe and Mn in treated plants. Lead and Cd accumulation in the root were always higher than in the shoot. In this investigation, toxicity level, growth dis - turbance, biomass reduction and accumulation of cadmium or lead were positively correlated with concentration of respective metal.