稀土对八角种子萌发及幼苗生长的生理效应

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

关键词:  八角  种子萌发  幼苗生长  稀土  生理效应

Key words:  Illicium verum  seed germination  seedling growth  rare-earth elements  physiological effects

摘要:

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著;100mg/L浓度RE对提高幼苗叶绿素含量、净光合速率最显著;200mg/L浓度RE增加幼苗叶片脯氨酸含量最显著;200mg/L和300mg/L浓度RE提高过氧化物酶活性最显著;100mg/L和200mg/L提高过氧化氢酶活性最显著;各种浓度的RE均能提高超氧物歧化酶活性;200mg/L和300mg/L浓度RE能显著降低叶片在低温和高温干旱处理下的电导率。

Abstract:

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.