盐胁迫下氯丙嗪和LaCl_3对稻苗K^+、Na^+、Cl^-吸收转运的影响

Effects of CPZ and LaCl_3 on Uptake and Transport of K^+,Na^+ and Cl^- in Rice Seedlings Under Salt Stress

研究了氯丙嗪 (CPZ)和LaCl3 预处理阻碍Ca2 + ·CaM信使系统传导后 ,盐胁迫下稻苗体内Na+ 、K+ 和Cl-含量及吸收转运的变化 ,结果表明 :CPZ和LaCl3 预处理后 ,盐胁迫下稻苗对K+ /Na+ 的选择性吸收下降 ,致使稻苗K+ 含量减少、Na+ 含量增加 ,Na+ /K+ 比值显著增加 ;并且稻苗地上部Cl-含量也显著增加。盐胁迫处理稻苗 2d后解除盐胁迫 ,改用蒸馏水培养 ,在蒸馏水中加入CPZ或LaCl3 时 ,稻苗中含有较高的Na+ ,即CPZ和LaCl3 抑制稻苗将体内Na+ 排出体外的能力。上述结果表明 ,盐胁迫下 ,Ca2 +·CaM信使系统可能参与稻苗对K+ 、Na+

Effects of pretreatment with CPZ(chlorpromazine) and LaCl 3 in blocking Ca 2+ ·CaM messenger system in the uptake and transport of K +, Na + and Cl - in rice seedlings under salt stress were investigated. The results showed that pretreatments with LaCl 3 and CPZ significantly inhibited the selective uptake of K +/Na +(Fig.3)by rice seedlings under salt stress, and thus decreased the K + content (Fig.1), increased the Na + content of rice seedlings (Fig.1), and so significantly increased Na +/K + ratio (Fig.2), and Cl -content of shoot also was increased (Fig.4). During cultivation in distilled water after eliminating salt stress, the treatment with LaCl 3 and CPZ in distilled water has more Na + in rice seedlings (Fig.5),this indicated that Na + efflux out of rice seedling was inhibited by LaCl 3 and CPZ. All the results above suggested that Ca 2+ ·CaM messenger system was involved in selective uptake of Na +/K + and Cl - by rice seedlings under salt stress,thus rice seedling could have some action to adapt to salt stress.