酸、铝浸种对萝卜种子萌发和芽苗生长的影响

Effect of Soaking with Acid and Aluminum on Seed Germination and Seedling Growth of Raphanus sativus

以萝卜为供试材料,研究了酸、铝浸种对萝卜种子萌发和芽苗生长的影响。结果表明,中强度的酸、铝浸种处理(pH≤4.5、铝浓度100～1 000μmol/L)对种子发芽率无显著影响,但显著提高了发芽势、发芽指数和活力指数,而对芽苗根长、茎长、芽苗总长、根重、地上部鲜重等生长指标有一定的抑制作用。低浓度铝(0～10μmol/L)处理时,芽苗生长指标随pH值(5.5～3.5)的下降,先上升后下降;中高浓度铝(100～5 000μmol/L)处理时,则随pH值的下降而不断下降;芽苗生长指标随铝浓度的增加总体呈下降趋势,且根系受胁迫影响最大,是反应最敏感的部位。这些结果表明,萝卜种子萌发期较芽苗生长期对酸、铝胁迫有更强的耐性。当pH值低于4.5,铝浓度达到1 000μmol/L时,即可显著抑制萝卜芽苗生长。

Effects of soaking with different acid and aluminum （AI） stress on seed germination and seedling growth of radish （Raphanus sativus） were investigated. The results showed that medium intensity of acid and Al stress （ pH ≤4.5, Al concentration 100 to 1 nation, while had negative influence significant positive influence on seedling growth such as 100μmol/L） did not have significant influence on seed germi- on germination power, germination index, vigor index, and root, stem and seedling length, root and aboveground fresh weight. In the low concentrations of Al treatments （0 to 10μmol/L）, the seedling growth increased firstly and then decreased with pH value changing from 5.5 to 3.5. In the medium and high concentrations of Al treatments （ 100 to 5 000μmol/L）, the seedling growth decreased with the decreasing of pH value. While the seedling growth showed a decreased trend with increasing of Al concentrations, especially for root, thus root was the most sensitive part. These results indicated that radish seed germination period was more tolerant to acid and Al stress than seedling growth. When pH value was under 4.5, the Al concentration was 1 000μmol/L, which could significantly inhibit the seedling growth of radish.