NaCl胁迫下3个甜高粱品种生理指标的比较研究

为了筛选出耐盐能力较强的品种，在NaCl胁迫下，以T601、‘辽甜一号’和XT-2甜高粱品种为材料，设计盆栽实验的方法，在0%、0.4%、0.8%、1.2%、1.6% NaCl胁迫下，观察生理性状，并对甜高粱各品种叶绿素和丙二醛含量进行测定。结果表明，不同浓度NaCl胁迫下，3种甜高粱品种幼苗叶片中叶绿素a、叶绿素b和叶绿素a+b含量随着处理时间的延长均呈下降的趋势。各品种各处理叶片叶绿素含量均小于对照。T601叶绿素含量最大，其次为‘辽甜一号’，XT-2最小；3个甜高粱品种幼苗叶片中的丙二醛含量随着浓度的增加和时间的延长均呈增加的趋势。T601和‘辽甜一号’对照丙二醛含量小于XT-2，受到NaCl胁迫后，XT-2各处理丙二醛仍然大于其他2个品种。T601各处理丙二醛大于‘辽甜一号’。根据3个品种受NaCl胁迫后的叶绿素和丙二醛含量的比较，可以初步确定3个品种的耐盐能力大小顺序为T601 > ‘辽甜一号’ > XT-2。

The Comparison Study on the Effects of NaCl Stress on the Physiological Characters of Sweet Sorghum Varieties

To select the salt tolerant variety of sweet sorghum,the physiological characters,as chloroplast and MDA of three sweet sorghum varieties（T601,‘Liaotian-1’ and XT-2） under the condition that 0%,0.4%,0.8%,1.2%,1.6% of NaCl stress were analyzed.And the physiological shapes were observed.The results indicated that：the content of chlorophyll a,chlorophyll b and chlorophyll a＋b decreased following the treating time and increasing NaCl percentages.Chlorophyll of three varieties under treatment were lower than the CK.Chlorophyll of T601 was the highest,while of XT-2 was the lowest;the MDA of all three varieties increased following the treating time and increasing NaCl percentages.The MDA of T601 and ‘Liaotian-1’ were lower than XT-2.And during NaCl treating period,the MDA of XT-2 was also higher until the end of treating period.The MDA content of T601 was higher than of ‘Liaotian-1’.According to the chlorophyll and MDA,it could be concluded that：the salt tolerance of them were T601 ‘Litaotian-1’ XT-2.