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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。
In order to screen out varieties with strong salt tolerance ability, pot experiments were conducted under the stress of 0%, 0.4% and 0.8% under the NaCl stress, using sweet sorghum variety T601, ’Liaotian No.1’ and XT- , 1.2%, 1.6% NaCl stress physiological traits were observed, and the sweet sorghum varieties of chlorophyll and malondialdehyde were determined. The results showed that the contents of chlorophyll a, chlorophyll b and chlorophyll a + b in seedlings of three sweet sorghum varieties tended to decrease with the increase of treatment time under the different NaCl concentrations. The leaf chlorophyll content of all varieties were less than the control. T601 had the highest content of chlorophyll, followed by Liaotian-1 and the lowest of XT-2. The content of malondialdehyde in the leaves of three sweet sorghum cultivars tended to increase with the increase of concentration and time. The content of malondialdehyde in T601 and Liao Tian 1 was lower than that of XT-2. After NaCl stress, the content of malondialdehyde in XT-2 was still higher than the other two varieties. T601 treatment of malondialdehyde than Liao sweet one. According to the comparison of the contents of chlorophyll and malondialdehyde in three cultivars under NaCl stress, the order of salt tolerance of three cultivars was T601> Liao Tian No.1> XT-2.