稀土对八角种子萌发及幼苗生长的生理效应

用０ｍｇ／Ｌ、５０ｍｇ／Ｌ、１００ｍｇ／Ｌ、２００ｍｇ／Ｌ、３００ｍｇ／Ｌ、５００ｍｇ／Ｌ浓度稀土（ＲＥ）处理八角（Ｉｌｌｉｃｉｕｍ ｖｅｒｕｍ Ｈｏｃｋ．ｆ．）种子和幼苗，结果表明：１００ｍｇ／Ｌ浓度ＲＥ增加种子发芽时的根长、芽长、侧根数和提高种子活力指数最显著；２００ｍｇ／Ｌ浓度ＲＥ提高种子发芽率、发芽指数、日平均发芽率和发芽值最显著；３００ｍｇ／Ｌ浓度ＲＥ提高发芽高峰值和降低平均发芽天数最显

Physiological Effects of Rare-earth Elements on the Seeds Germination and Seedlings Growth of Illicium verum

The rare earth elements (RE) with six concentration levels of 0 mg/L,50 mg/L,100 mg/L,200 mg/L,300 mg/L,500 mg/L were used in seed germination of Illicium verum . RE of 100 mg/L was the most significant in increasing to the growth of the roots and the buds and the numbers of lateral roots and the vigor index of the seeds. RE of 200 mg/L was best significantly raising the germination percentage and the germination index and the mean diurnal germination percentage and the germination value of the seeds. RE of 300 mg/L was best significantly raising the peak value and the mean germination days of the seeds.RE of 100 mg/L was best significantly raising the chlorophyll contents and net photosynthetic rate of the seedlings.RE of 200 mg/L was best significantly increasing the proline content of the seedlings. RE of 200 mg/L and 300 mg/L raised the activity of peroxidase and 100 mg/L and 200 mg/L raised the activity of the catalase best significantly. The RE of different concentration were raised the activity of superoxide dismutase.RE of 200 mg/L and 300 mg/L significantly decreased the electric conduction rate when the leaves were at low/high temperature and dry condition.