【摘要】 采用盆栽试验方法,以黄华占为对照,探讨盐胁迫对海稻86植株生长和矿质元素吸收、运输及分配的影响。结果显示:盐胁迫抑制了水稻干物质量的积累,海稻86与黄华占耐盐阈值分别为8.72、6.35 g/kg,与黄华占相比,海稻86表现出较强的耐盐能力。盐胁迫下,与黄华占相比,海稻86通过根系选择性吸收Na⁺,调节Na⁺在各器官水平的分配,其叶鞘能积累更多Na⁺,可减少Na⁺对叶片的毒害。盐胁迫下,黄华占叶片中K⁺含量与对照无显著变化,但其叶鞘及根系中K⁺含量在土壤全盐含量为4.64 g/kg条件下,其K⁺含量大幅降低,降幅分别达53.8%和70.0%;海稻86各器官中K⁺含量随盐胁迫程度增加而逐渐下降,叶片中K⁺含量降幅相对较低。随着盐胁迫程度加深,黄华占叶鞘中Ca²⁺、Mg²⁺含量显著下降,而海稻86无显著变化;此外,与黄华占相比,海稻86具有较强抑制Na⁺,促进Ca²⁺、Mg²⁺向上运输的能力。更多还原

【Abstract】 The pot experiment was used to study the effects of salt stress on growth of Oceanrice 86 and absorption,transportation and distribution of mineral elements using Huanghuazhan as control. The results showed that salt stress inhibited the dry matter accumulation of rice plants. The salt tolerance threshold of Oceanrice 86 and Huanghuazhan was 8.72 g/kg and 6.35 g/kg,repectively. Compared with Huanghuazhan,salt tolerance of Oceanrice 86 was stronger. Under salt stress,Oceanrice 86 selectively absorbed Na ⁺ through the root system and regulated the distribution of Na⁺ at the organ level. Its leaf sheath accumulated more Na ⁺,reducing the toxicity of Na ⁺ to the leaves. The content of K ⁺ in Huanghuazhan leaves did not change significantly from that of the control,but the K ⁺ content in the leaf sheath and root system was 4.64 g/kg in the soil. The K⁺ content was greatly reduced by 53.8% and 70.0%,respectively. The K⁺ content in various organs of Oceanrice 86 gradually decreased with the increase of the degree of salt stress,and the decrease of K⁺ content in leaves was relatively low. The content of Ca²⁺ and Mg²⁺ in the leaf sheath of Huanghuazhan decreased significantly with the increase of salt-stress,while Oceanrice 86 had no significant changes. Compared with Huanghuazhan,Oceanrice 86 had a strong ability to inhibit Na ⁺ and promote the upward transport of Ca^{2 +} and Mg^{2 +}.更多还原