不同因素对水稻离体根吸收四价硒影响

Effects of Various Factors on Selenite Uptake of Excised Rice Roots

研究结果显示,pH对水稻离体根吸收4价硒(Se)有显著影响,这与不同pH下4价Se的存在形式有关。进一步研究表明,低温抑制4价Se吸收和一定浓度的NaCl促进4价Se吸收,可能在于低温和NaCl影响到根内代谢而间接影响4价Se吸收,而P抑制4价Se吸收可能与二者拥有共同吸附位点有关。

An experiment was carded out on effects of various factors on selenite uptake of excised rice roots. Results indicated that pH affected selenite uptake of excised rice roots significantly, which, however, was linked to forms of selenite. Low temperature inhibited uptake of selenite, but NaCl of a certain concentration promoted the uptake because temperature and NaCl might have an indirect effect on uptake of selenite by affecting metabolisms of the roots. The inhibition of selenite uptake by phosphate might relate to sharing of common absorption sites on root surface with selenite.