水稻耐碱突变体ACR78在苏打盐碱胁迫下的离子吸收特性

Ion Absorption Characteristics of Mineral Elements of Alkali-tolerant Rice Mutant ACR78 under Soda Saline-alkaline Stress

利用盆栽方法,比较研究了盐碱胁迫下水稻耐碱突变体(ACR78)及其野生型植株体内K+、Na+、Ca2+、Mg2+、Fe2+和Zn2+含量的变化。结果表明,盐碱胁迫下,ACR78全株Na+总含量比野生型减少2.9%,显著低于野生型。同时,其K+、Zn2+和Mg2+含量比野生型分别增加18.3%,89.7%和4.9%(P<0.05),全株K+/Na+比值(0.16)显著高于野生型(0.13)。从器官水平看,ACR78茎中K+/Na+比值极显著高于野生型,约为野生型的1.4倍。ACR78根和茎中Na+含量显著低于野生型(14.0%和5.9%),其茎中K+含量比野生型增加32.3%,根和叶中无显著性差异。ACR78根和茎中Zn2+含量分别比野生型增加44.2%和202.7%,Mg2+含量在器官中的分配规律与Na+相反。说明ACR78可显著抑制Na+的吸收,并对K+、Zn2+和Mg2+具有较强的选择性吸收能力。

The content change of K^＋ , Na＋ , Ca^2＋ , Mg^2＋ , Fe^2＋ and Zn^2＋ of alkaline tolerant rice mutant（ACR 78） and its wild type were compared analysis by pot culture. The results showed that the total Na^＋ content of ACR78 was 2.9% lower than that of the wild type,and the K^＋ ,Zn^2＋ and Mg^2＋ content of ACR78 were 18.3% ,89.7%and 4.9% （ P 〈 0.05） higher than that of the wild type respectively. The ratio of K^＋ and Na^＋ in stem of ACR78 was approximately 1.4 times of the wild type,the difference was very significant. The Na^＋ content in root and stem of ACR78 were significantly lower than that of the wild type （ 14.0 % and 5.9 % respectively）, and the K^＋ content in stem of ACR78 was 32.3 % higher than the wild type, but the content in root and stem were no difference. The Zn^2＋ content in root and stem of ACR78 were 44.2 % and 202.7 % higher than the wild type respectively. The distribution law of Mg^2＋ content in organs was opposite to the Na ~ content. The results indicated that ACR78 could significantly inhibit the uptake of Na＋ and had the ability of selective uptake to K^＋ , Zn^2＋ and Mg^2＋ .