盐胁迫对黄蜀葵生长及金丝桃苷含量的影响

通过种子萌发试验和盆栽试验,探讨了盐胁迫对黄蜀葵种子发芽、生长发育、植株体内离子分布以及金丝桃苷含量的影响。结果表明,盐胁迫对黄蜀葵种子萌发有一定的抑制作用,随着盐浓度的增加,其发芽率呈下降趋势;低浓度NaCl胁迫有利于黄蜀葵生长,其中,0.3%的NaCl处理下生长发育较好;盐处理后,黄蜀葵根中Na+和K+含量显著高于茎与叶,Ca2+含量、K+/Na+和Ca2+/Na+值显著低于茎与叶;随NaCl浓度提高,根中Na+含量逐渐增加,各个器官中Ca2+和K+含量均呈上升趋势。盐胁迫对黄蜀葵花冠中金丝桃苷含量影响显著,当NaCl浓度为0.3%时,金丝桃苷含量达到最高,但当NaCl浓度为0.7%时,金丝桃苷含量急剧下降。认为黄蜀葵为耐盐植物,适度的盐胁迫可以提高黄蜀葵花冠中金丝桃苷的含量。

Effects of salt stress on growth and hyperin content of Abelmoschus manihot (L.) Medic.

We conducted seed germination and pot experiment, and studied the effects of salt stress with different concentrations of NaCl on the seed germination, growth, ion distribution and hyperin content of Abelmoschus manihot . The results showed that seed germination of Abelmoschus manihot was inhibited under the salt stress, and germination energy and germination rate declined with increased salinity. Abelmoschus manihot grew well under the low concentration of NaCl stress, and 0.3% NaCl was advantage to the growth and development of the plants. Na+ and K+ were mainly accumulated in the root, while Ca2+ was mainly accumulated in the leaf and stem, and the ratios of K+/Na+ and Ca2+/ Na+ in roots were significantly lower than those in stem and leaf. The content of Na+ in root and the contents of K+ and Ca2+ in the root, stem and leaf improved with increased salinity. NaCl stress had great effects on hyperin content of Abelmoschus manihot corollas, and the content of hyperin in corollas treated with 0.3% NaCl solution was the highest, while its would rapidly decrease with 0.7% NaCl solution. We conclude that Abelmoschus manihot is a species of salt-tolerant plant which can be planted in saline land, and proper concentration of salt stress is good for the accumulation of hyperin in Abelmoschus manihot corollas.