摘要
为了给芙蓉葵在滨海盐渍地播种育苗和重盐碱地园林绿化应用提供科学依据,分别以芙蓉葵种子、幼苗和1 a生越冬根为试材,在人工模拟盐胁迫强度条件下,研究了不同浓度NaCl溶液处理对芙蓉葵种子发芽期和苗期耐盐性,以及越冬根萌生苗耐盐性的影响。结果表明:0.2%盐度胁迫会促进芙蓉葵种子萌发,随着NaCl浓度的增大,种子初始萌发时间延长,发芽率和萌发初期生长均受到抑制,且抑制程度均随盐胁迫浓度的增大而逐渐增强,盐度>0.6%后会显著抑制种子萌发,但每天给予12 h光照可以显著提高发芽率;盐胁迫会抑制芙蓉葵幼苗生长,且抑制作用随盐胁迫浓度的增大而逐渐增强,不影响其正常形态性状的最高盐胁迫浓度为0.6%,当盐胁迫浓度超过该阈值后,会使芙蓉葵幼苗的观赏价值明显降低;芙蓉葵越冬根发芽期的耐盐能力较强,盐度>1.2%后成活率显著下降。根据生理指标测定和幼苗外观形态观测结果,推断芙蓉葵种子萌发和幼苗生长的耐盐阈值是0.6%,越冬根正常萌发的耐盐阈值是1.2%。
In order to provide a scientific basis for Hibiscus moscheutos sowing and raising seedlings in the coastal saline soil and landscaping applications in heavy saline soil , taking Hibiscus moscheutos seeds, seedlings and overwintering roots as test materials, the effects of different concentrations of NaCl solution treatments on Hibiscus moscheutos seeds germination and seedlings salt tolerance , and overwintering roots sprouting salinity tolerance were studied in the artificial simulating salt stress conditions.The results showed that 0.2% salinity stress could promote Hibiscus moscheutos seed germination, with the increasing of NaCl concentration , the initial time of seed germination was extended, the germination rate and germination growth were inhibited and the degree of inhibition was increased gradually, more than 0.6% salinity stress significantly inhibited the seed germination , but given 12 h light every day could significantly increase the germination rate.Salt stress could inhibit the growth of Hibiscus moscheutos seedlings, and the inhibition was increased gradually with the increase of salt concentration , the highest salinity which did not affected the normal morphological characters was 0.6%, when the NaCl concentration more than the threshold concentration, the ornamental value of Hibiscus moscheutos seedlings was decreased significantly.The salt tolerance of Hibiscus moscheutos overwintering root was better during germination period, the survival rate was significantly decreased when the NaCl concentration was more than 1.2%.According to the observation results of the determination of physiological index and seedling morphology , the salt tolerance threshold of the Hibiscus moscheutos seed germination and seedling growth was 0.6%, the salt tolerance threshold of overwintering root normal germination was 1.2%.
出处
《河北农业科学》
2013年第6期22-27,共6页
Journal of Hebei Agricultural Sciences
基金
国际科技合作与交流专项经费资助项目(2011DFA30990)
关键词
芙蓉葵
盐胁迫
发芽率
越冬根
形态指标
Hibiscus moscheutos L.
NaC
stress
Germination rate
Overwintering root
Morphological index
作者简介
王文成（1961-），男，河北蔚县人，研究员，主要从事耐盐绿化苗木新品种选育及其应用技术研究。Tel：0315-8723265；E-mail：bhswwe@163．com。
