盐胁迫下番茄种子萌发和幼苗生长发育的调控研究

Regulation on seed germination and seedling growth of tomato under NaCl stress

采用盆栽土培试验的方法,利用不同种类的植物生长调节剂处理番茄种子,在5 g/kg NaCl胁迫下,探索植物生长调节剂对番茄种子萌发和幼苗生长发育的影响。结果表明:在NaCl胁迫下,用适合浓度的吲哚乙酸(IAA)、赤霉素(GA_3)、6-苄氨基嘌呤(6-BA)和脱落酸(ABA)处理番茄种子均能提高番茄种子活力,促进幼苗的生长发育。相对而言,用25 mg/L IAA处理能够增加幼苗鲜重、株高和根长;用150mg/L的GA_3处理能够提高种子发芽指数、活力指数和幼苗鲜重等指标;用0.1 mg/L 6-BA处理能够提高种子的活力指数,促进幼苗的生长;用0.1 mg/L ABA处理能够显著提高种子的发芽率和幼苗的平均根长。4种植物生长调节剂综合比较表明,在5 g/kg NaCl胁迫下用150 mg/L GA_3处理番茄种子,对促进其种子荫发和幼苗生长发育的效果最理想。

Tomato seeds were treated with different plant growth regulators at various concentrations and pot experiments with tomato were carried out under 5 g/kg NaC1 stress.The results showed that under the salt stress all the seed treatments with IAA,GA3,6-BA and ABA at an appropriate concentration could improve the seed vigor and promote the seedling growth.Relatively speaking,the treatment with 25 mg/L IAA could increase the seedlings＇ fresh weight,plant height and root length;the treatment with 150 mg/L GA3 could improve the seed germination index and vitality index and the seedlings＇ fresh weight; the treatment with 0.1 mg/L 6-BA could elevate the seed vitality index and accelerate the seedling growth; and the treatment with 0.1 mg/L ABA could significantly increase the seed germination rate and the mean length of roots.Among all the seed treatments with the 4 plant growth regulators the treatment with 150 mg/L GA3 had the best effects on the seed germination and the seedling growth under 5 g/kg NaCl stress.