盐胁迫下外源硅对硅突变体和野生型水稻生物量与营养元素含量的影响

采用溶液培养法研究外源硅对不同盐浓度胁迫下硅突变体水稻和野生型水稻营养元素吸收和生物量的影响。结果表明：在0mmol/L、50mmol/L、100mmol/L、150mmol/L的NaCl浓度处理下，随NaCl浓度的提高，2种水稻的茎叶与根系生物量降低。相同盐浓度处理下，与不加硅相比，外源硅提高了2种水稻茎叶和根系的生物量；在0mmol/L、50mmol/L、100mmol/L、150mmol/L的NaCl浓度处理下，随着NaCl浓度的提高，12种水稻茎叶与根系中K、Fe、Mg、Mn、Zn、Ca、P含量降低，而Na浓度升高；相同浓度盐胁迫条件下，与不加硅相比，加入外源硅可以提高水稻茎叶与根系中K、Fe、Mg、Mn、Zn、Ca、P的含量，降低Na的含量；比较外源硅对2种水稻在相同盐浓度胁迫下的缓解效应，对野生型水稻的缓解效应显著大于硅突变体水稻。

Effects of Silicon on The Biomass and Nutritional Elements Uptake of Si Mutant Rice and Wild Rice Under Salt Stress

Rice （Oryza sativa.L） is the most effective Si-accumulating plant, and accumulates Si up to 10.0% of shoot dry weight. But in our experiments we use the Si mutant rice which has a defective in Si uptake, the Si concentration in mutant rice is only one-tenth of that in wild rice. The effect of silicon on the biomass and nutritional element uptake of Si mutant rice and wild rice seeds under salt stress were studied. The results showed that the rice＇s dry biomass decreased as the salt concentration increased in the culture solution; The contents of the K, Fe, Mg, Mn, Zn, Ca, P decreased as the salt concentration increased in the culture solution, but the level of Na has opposite rule; Under the same salt stress, the addition of silicon could make the contents of K, Fe, Mg, Mn, Zn, Ca, P increased and Na decreased; The effect of silicon on the rice biomass and nutritional elements uptake of wild rice are more efficiency than Si mutant rice under same salt stress.