不同硫水平下硒对小白菜生长及养分含量的影响

Effects of selenium on the growth and nutrient content at different sulphur level in pakchoi

以小白菜为试验材料,研究了不同供硫水平下,不同硒浓度对小白菜植株生长及养分含量的影响.结果表明,低硫水平时施用低浓度硒能促进植株的生长,而高浓度硒则抑制植株生长;高硫水平时加硒均抑制了植株生长;加硒后植株体内的硒含量均与外源硒浓度呈显著的正相关,而提高硫浓度则减少植株硒的含量;低硫水平下施用低浓度硒对N、P、K、Ca、Mg、Fe、Mn、B含量的影响不显著,但高浓度硒减少N、K、Fe、Mn、B的含量;在高硫水平下,施用硒增加了N、Fe、Mn的含量,而对P、K、Ca、Mg、B的含量影响不大;低硫和高硫水平下施用硒均能促进植株体内蛋白质的含量而降低游离氨基酸总量.

Effects of selenium (in the form of selenite) on the growth and nutrient content in pakchoi (Brassica chinensis L.) at different levels of sulphur (in the form of sulphate) supply were studied. The results showed that plant growth was improved by addition of low doses of selenium and inhibited by addition of high doses of selenium at low sulphur concentration. However,the plant growth was inhibited by the application of selenium at high sulphur concentration. Selenium accumulation in pakchoi increased with selenium concentration in culture solution and slightly decreased with increase of sulphur level. At low sulphur level, N, P, K, Ca, Mg, Fe, Mn and B content of the plant were not considerably affected by low doses of selenium and N, K, Fe, Mn and B were reduced by high doses of selenium. At high sulphur level, N, Fe and Mn content were increased by application of selenium. However, The P, K, Ca, Mg and B content were not remarkably affected. The protein content increased and the total free amino acid content decreased following application of selenium at both high and low levels of sulphur.