油菜素内酯对不同类型盐胁迫下辣椒种子萌发及幼苗生长的影响

在盐胁迫下,植物会受到盐离子的毒害,产生大量有毒自由基,导致自由基代谢失衡,膜脂过氧化程度加重,蛋白质降解,DNA链被破坏,最终使植物生长发育受阻。以辣椒为研究对象,研究了油菜素内酯(BR)对不同盐胁迫(中性盐、碱性盐)下辣椒种子萌发、幼苗生长发育的影响。结果显示,不同类型盐胁迫下辣椒种子的发芽率下降,BR浓度0.25 mg/L是恢复NaCl胁迫下辣椒种子萌发力最适合的处理浓度,发芽率为95.9%,发芽势为92.9%,均显著高于其他处理;BR浓度0.5 mg/L,是恢复NaHCO3胁迫下辣椒种子萌发力最适合的处理浓度,发芽率为92.1%,发芽势为90.7%,均显著高于未经BR处理的种子。BR能显著缓解不同盐胁迫对辣椒幼苗生长的抑制作用,NaCl胁迫下,BR浓度为0.25 mg/L时,对恢复幼苗茎质量作用明显,但对茎长作用不明显。NaHCO3胁迫下,BR浓度为0.5 mg/L时,对幼苗生长促进作用最为明显。

Effect of BR on Seed Germination and Seedling Growth of Pepper under Different Types of Salt Stress

Under salt stress,plants will be poisoned by salt ions,producing a large number of toxic free radicals,which will lead to the imbalance of free radical metabolism,the aggravation of membrane lipid peroxidation,the degradation of protein,the destruction of DNA chain,and eventually the growth and development of plants will be hindered The effects of BR on seed germination and seedling growth of pepper under different salt stresses(NaCl and NaHCO3)were studied,taking pepper as the research object.The results showed that the germination percentage of pepper seeds were decreased under salt stress.BR concentration of 0.25 mg/L was the most suitable concentration for restoring germination ability of pepper seeds under NaCl stress,and the germination percentage and germination potential were 95.9%and 92.9%,respectively.BR concentration of 0.5 mg/L was the most suitable concentration to restore the germination power of pepper under NaHCO3 stress,and the germination rate was 92.1%,the germination potential was 90.7%,which were significantly higher than those without BR treatment.BR could significantly alleviate the inhibition of different salt stress on the growth of pepper seedlings.BR were 0.25 mg/L under NaCl stress had obvious effect on the restoration of seedling stem quality,but had no effect on stem length.When the concentration of BR was 0.5 mg/L,it’s effect on seedling growth was the most obviouly under NaHCO3 stress.