水稻苗期对不同pH值下NaCl和NaHCO3胁迫响应的比较

以3个水稻品种为材料，在萌发期和幼苗期进行不同pH下NaHCO3与NaCl胁迫处理，测定了水稻幼苗鲜重、丙二醛(MDA)、脯氨酸(Pro)含量及根系活力变化。结果表明，发芽期胁迫3d后，NaHCO3处理开始抑制根系生长，NaCl处理到第6天才抑制幼苗地上部生长。幼苗期胁迫处理时，鲜重减少，根系活力显著降低，MDA累积，脯氨酸大量积累。这些变化与胁迫时的pH明显相关。在相同胁迫处理下，品种213较其它2个品种耐逆性相对较强。

Comparison of the Response of Rice Seedlings to NaCl and NaHCO3 Stress with Different pH Value

Three elite rice varieties were exposed to the stress treatment of NaCl and NaHCO_ 3 with different pH values and concentrations during the seedlings growth stages, then the fresh weight,malomldehyde(MDA),Proline(Pro) content and root vigour change were detected. The results demonstrated that,in the case of seed germination stage, the root growth was initially retarded in three days later in NaHCO_ 3 stress treatment, but the shoot of rice seedlings began to grow slowly in six days later in NaCl stress treatment,seedlings also showed the sign of inhibition,the root vigor was lowered, MDA accumulated, and the Pro content was increased,and all these changes were in line with the pH values in the stress treatments. Finally variety 213 was relatively tolerant to this stress compared with the other two rice varieties in the same salt and alkaline stress condition.