盐胁迫对宇航四号朝天椒种子萌发和幼苗生长的影响

为耐盐辣椒新品种的选育和合理种植提供参考,采用单因素试验方法研究不同浓度NaCl胁迫对宇航四号朝天椒种子萌发和幼苗生长的影响。结果表明:1)低浓度(≤100mmol/L)NaCl溶液对宇航四号朝天椒种子萌发和幼苗生长具有促进作用,高浓度(≥200mmol/L)则显著抑制种子萌发和幼苗生长。其中,100mmol/L NaCl溶液处理种子的发芽率、发芽势、发芽指数、活力指数及幼苗鲜重等指标分别较CK(去离子水)提高13.67%、34.00%、30.07%、0.69和6.05mg;250mmol/L NaCl溶液处理种子的各指标分别较CK降低2.33%、60%、27.57%、1.13和22.45mg。2)处理14d后,幼苗丙二醛、可溶性糖及脯氨酸含量均有不同程度的升高,100 mmol/L NaCl溶液处理幼苗的各指标较CK分别提高1.02μmol/g、7.61mg/g和7.19μg/g。在生产中,低浓度NaCl溶液(≤100mmol/L)不仅可以促进种子萌发,提高发芽率,还可以促进幼苗保持较好的生长状态。

Effects of Salinity Stress on Seed Germination and Seedling Growth of Capsicum annuum var.conoides Space Four

In order to provide references for the selection and breeding of new salt-tolerant pepper varieties and the reasonable cultivation of pepper,the authors investigated the effects of NaCl stress at different concentrations on seed germination and seedling growth of C.annuum var.conoides (Space four) by the single-factor test method.The results showed as follow:1) The low concentration NaCl solution (≤100 mmol/ L) promoted the seed germination and seedling growth of C.annuum var.conoides (Space four),while high concentration NaCl solution (≥ 200 mmol/L) significantly inhibited their seed germination and seedling growth.The seed germination rate,germination potential,germination index,vigor index and seedling fresh weight index of 100 mmol/L NaCl treatment group were higher than CK respectively by 13.67％,34.00％,30.07％,0.69 and 6.05 mg.While those of 250 mmol/L NaCl treatment group were less than CK by 2.33％,60％,27.57％,1.13 and 22.45 mg,respectively.2) After NaCl solution treatment for 14 d,the contents of malondialdehyde,soluble sugar and proline in seedlings increased in varying degrees,those of 100 mmol/L NaCl treatment group were higher than CK by 1.02 μmol/g,7.61 mg/g and 7.19 μg/g,respectively.In production practice,the low concentration NaCl solution (≤100 mmol/L),not only can promote the germination of seeds,improve germination rate,but also maintain good growth state of the seedlings.