Abstract
Seeds of Portulaca oleracea L. var. sativa (Haw.) DC. were sown in the pots filled with the sandy loam soil contained 0, 5, 10 and 20mg/kg of cadmium, and then were grown under a grass-house conditions. After growing, emergence time, plant height, the number of leaf per plant, the number of capsule per plant, formation time of capsule, seed ripening time, the number of seed of plant, and germination rate of seeds newly formed were measured. Emergence, the number of capsule per plant and the germination rate of seeds were not affected affected by cadmium even at 20mg/kg, but the other growth parameters were affected;formation time of capsule and seed ripening time were delayed for 1-2weeks, and the total number of seed per plant and thousand grain weight were significantly decreased at 20mg/kg as compared with control. In addition, it was found that defoliation of Portulaca oleracea L. var. sativa (Haw.) DC. was possibly suppressed by cadmium because the number of leaf per plat in 20mg/kg was decreased from 2 WAS (weeks after seeding) to 9 WAS, but it was exceeded that of control 10 WAS.
Thus, it was demonstrated that cadmium affects the various parameters concerning about shoot growth and seed production of Portulaca oleracea L. var. sativa (Haw.) DC, especially in total number of seed, resulting that the seed is needed to be sawn repeatedly when the plant is used as for phytoremedater at a cadmium polluted soil.
