氯对马铃薯生理效应的影响

The Influence of Chlorine on Physiological Effects of Potato:

本试验结果表明,(1) Cl^-抑制马铃薯植株对NO_3^-的吸收;(2) Cl^-不仅抑制马铃薯根从溶液中吸收H_2^(32)PO_4^-,更主要是阻碍H_2^(32)PO_4^-从根向地上部运输,而且随Cl^-浓度的增加而加强;(3) K^+的吸收速率与溶液中的Cl^-浓度呈极显著线性正相关(r=0.999^(**)),回归方程为Y=0.486×10^(-3)X+2.27;(4) ^(14)CO_2示踪试验表明,培养液中Cl^-浓度过高会抑制光合产物向块茎积累;(5) 培养液中Cl^-浓度超过500mg/kg时,马铃薯植株表现中毒症状,块茎产量、淀粉含量都显著下降,可溶性糖含量上升。

Cl^- impaired the potato uptaking ^(?)NO_3^- from external solution. Cl inhibited the absorption of H_2^(32)PO_4^(2-) by the roots. It is more important that Cl^- inhibited the long-distance transport of H_2^(32)PO_4^(2-) from roots to shoots. Moreover its inhibition increased as the concentration of Cl rised. Cl^- enhanced the uptake of K^+. The uptake speed of K^+ was very significantly correlated with the concentration of Cl^- in external solution (r=0.99(?)). Regression equation was Y=0.486×10^(-3)X+2.27. ^(14)CO_2 tracer experiment showed that high concentration (>300mg/kg) Cl^- in external solution inhibited the photosynthesis and the photosynate accumulated in the tubers reduced. When [Cl^-] in external solution was higher than 550 mg/kg, the tuber production and starch contents reduced, as well as the dissoluble sugar content incressed.