毕业论文___不同玉米品种抗盐性比较.doc

论文题目：不同品种玉米抗盐性比较 摘 要：本试验采用滑986、滑丰8、蠡玉68三个不同品种的玉米，研究其抗盐能力，用含有不同浓度的NaCl模拟盐胁迫，分别测定三种玉米幼苗叶片中生理生化指标，其中包括叶绿素，脯氨酸，丙二醛，通过各项生理生化指标来比较所选玉米品种的抗盐性。结果表明：在低等(50mmol/L)和中等(100mmol/L)盐胁迫下，滑986的叶绿素含量为对照组的120％、87％，丙二醛比对照组升高了0.7％、5.7％，脯氨酸含量分别为对照组的1.47倍、0.92倍，滑丰8的叶绿素含量为对照组的78％、64％，丙二醛比对照组升高了9％、13％，脯氨酸含量分别为对照组的1.20倍、0.15倍，蠡玉68的叶绿素含量为对照组的150％、130％，丙二醛比对照组升高了0.2％、1.6％，脯氨酸含量分别为对照组的5.83倍、18.29倍，综合分析叶绿素、丙二醛、脯氨酸三种指标，在低等和中等盐胁迫下三种玉米的抗盐能力依次为蠡玉68滑986滑丰8;在较高(150mmol/L-250mmol/L)盐胁迫下，滑986的叶绿素含量为对照组的57％、44％，丙二醛比对照组升高了7.1％、32.3％，脯氨酸含量分别为对照组的0.57倍、1.92倍，滑丰8的叶绿素含量为对照组的59％、48％，丙二醛比对照组升高了31％、31％，脯氨酸含量分别为对照组的0.10倍、0.28倍，蠡玉68的叶绿素含量为对照组的100％、80％，丙二醛比对照组升高了11.8％、33.2％，脯氨酸含量分别为对照组的25.08倍、28.06倍，综合分析叶绿素、丙二醛、脯氨酸三种指标，在较高盐浓度下，蠡玉68抗盐能力依然很强，但滑986和滑丰8都不能抵御较高盐胁迫，抗盐能力相差无几。 关键词：玉米；抗盐性；叶绿素；丙二醛；脯氨 Title：Comparing Different Corn Varieties Salt Resistance Abstract: This experiment adopts three different corns of the hua 986, huafeng 8, zhuanyu68 to study the salet rsistance. By different concentration of NaCl salt stress simulation.Then measure three kinds of physiological and biochemical indexes of maize seedling leaves separately including chlorophyll and proline, malondialdehyde.The results showed that:In low (50mmmol/L) and medium (100 mmol/L/L) salt stress, the chlorophyll content of hua986 as control group were 120%、87%，Malondialdehyde than the control group increased by 0.7% 、5.7%, Proline content in the control group, respectively 1.20 times, 0.15 times。Slide feng 8 the chlorophyll content of the control group were 78%, 64%, malondialdehyde than the control group increased 9%, 13%, proline content, respectively 1.20 times, 0.15 times that in the control group. the chlorophyll content of liyu68 as control group were 150%, 130%, malondialdehyde than the control group increased by 0.2%, 1.6%, proline content, respectively 5.83 times, 18.29 times that in the control group. Comprehensive analysis of chlorophyll, mda, proline three indicators, in the lower and middle three salt resistance of maize under salt s