Growth, ion distribution and salt-tolerance mechanism of eggplant seedlings under salt stress | NaCl胁迫对茄子幼苗生长和K＋、Na＋和Ca2＋分布的影响及耐盐机理

Chinese. 以耐盐品种＂多果多穗茄＂及盐敏感品种＂九叶茄＂和＂兰州长茄＂为试验材料,通过测定不同浓度NaCl处理条件（0和150 mmol/L）茄子干鲜重,根、茎和叶中K＋、Ca2＋和Na＋及K＋/Na＋和Ca2＋/Na＋,探讨了NaCl胁迫对茄子幼苗生长及Na＋和K＋吸收与分布的影响,并通过分析根、茎和叶不同器官中K＋、Ca2＋和Na＋及K＋/Na＋和Ca2＋/Na＋探讨了茄子幼苗的耐盐机理。结果表明：盐胁迫下,茄子幼苗干鲜重,根、茎和叶中K＋和Ca2＋显著降低,Na＋含量显著升高。耐盐品种相对生物量积累高于盐敏感品种,根、茎和叶中K＋及K＋/Na＋显著高于盐敏感品种,盐敏感品种的Ca2＋和Ca2＋/Na＋高于耐盐品种,盐敏感品种通过提高Ca2＋的利用率适应盐胁迫环境。NaCl胁迫下,耐盐材料主要通过离子区隔化维持根系中较高的K＋和K＋/Na＋,同时叶片中贮存大量的Na＋用以保持根系活力,从而提高茄子幼苗的耐盐性。

English. The salt-tolerant eggplant ＂Duoguo Duosui＂ and salt-sensitive eggplant ＂Jiuye＂,＂Lanzhou Chang＂ were used for experiments.The fresh and dry weight,the contents of K＋,Ca2＋,Na＋ and K＋/Na＋,Ca2＋/Na＋ ratios in the roots,stems and leaves were measured.The purpose was to understand the effects and mechanism of NaCl stress on the growth of different eggplant varieties.Our data showed that the fresh and dry weights,contents of K＋ and Ca2＋ in all cultivars were significantly decreased while Na＋ contents were increased.Salt-tolerant eggplant had higher relative biomass accumulations,K＋ contents and K＋/Na＋ ratios ithan the salt-sensitive ones.The Ca2＋ contents and Ca2＋/Na＋ ratios were contrary to K＋ contents and K＋/Na＋ ratios,which might be due to the increase of Ca2＋ absorption and utilization in salt-sensitive eggplants.In conclusion,the salt-tolerance mechanism of the salt-tolerant eggplants was to maintain a higher K＋ contents,K＋/Na＋ ratios in roots and Na＋ contents in leaves by ion compartmentation.