硒对烟草种子萌发的影响

Influence of different selenium concentration on tobacco seed germination

以烤烟品种K326为试验材料,研究Na2SeO3质量浓度(0.0、0.1、0.5、1.0、2.0、5.0、10.0、20.0 mg/L)对烟草种子萌发的影响。结果表明:随硒质量浓度的提高,烟草种子集中萌发期提前,萌发速率加快,发芽势增强,发芽率提高;硒质量浓度在1.0 mg/L以上时,发芽势与发芽率均极显著高于对照,叶绿素含量呈降低趋势;硒质量浓度小于2.0 mg/L时,幼苗干重差异不显著,大于2.0 mg/L后幼苗干重减小趋势明显;发芽种子根系长度随硒质量浓度增加呈减小趋势;各处理综合评分以2.0 mg/L硒质量浓度处理最高,1.0 mg/L次之,20.0 mg/L最低;在漂浮育苗过程中,保持营养液中硒质量浓度在1.0～2.0 mg/L,有利于烟草种子萌发。

K326, a flue-cured tobacco variety was used to observe the effects of different Na2SeO3 concentrations （0.0, 0.1, 0.5, 1.0, 2.0, 5.0, 10.0, 20.0 mg/L） on seed germination of tobacco. The results showed that germination period of tobacco seed appeared earlier, germination speed and rate increased and sprout potential improved with the increase of selenium concentration. Sprout potential and germination rate were significant higher than those of the control, and chlorophyll content presented a falling-rising-falling trend in selenium concentration of 1.0 mg/L or above. Seedling dry weight showed no significant change when selenium concentration was below 2.0 mg/L, but decreased under selenium concentration above 2.0 mg/L. Root length of germinating seed decreased with increasing selenium concentrations. The comprehensive score in treatment with 2.0 mg/L selenium was the highest, followed by treatment with 1.0 mg/L selenium and treatment with 20.0 mg/L selenium. In the process of tobacco seedling with floating system, selenium concentration ranged between 1.0 –2.0 mg/L is favorable to tobacco seed germination.