NaCl胁迫对白玉兰形态及生理特性的影响

为探究白玉兰对盐环境的耐受性,通过营养液培养法模拟盐胁迫,对不同胁迫强度下白玉兰的生长状态和生理生化应答特征进行测定分析。在整个胁迫过程中,幼苗受盐害症状最高等级为2级,即叶片出现变黄焦枯;随着胁迫时间的延长,幼苗叶片的相对电导率、丙二醛含量和脯氨酸含量呈上升趋势。叶绿素b含量、可溶性糖含量、可溶性蛋白含量、SOD活性和POD活性呈先升后降趋势。叶绿素总量和叶绿素a含量在100和200 mmol·L^-1NaCl胁迫下呈先升后降趋势,在300 mmol·L^-1NaCl胁迫下呈下降趋势。白玉兰有一定的耐盐能力,可在轻度盐土栽培应用。

Effects of NaCl Stress on Morphological and Physiological Characteristics of Magnolia denudata Desr.

In order to explore the adaptability of Magnolia denudata Desr.to salt stress,nutrient solution was used to simulate salt stress,and the growth traits,the physiological and biochemical response characteristics were determined and analyzed under different stress levels respectively.During the whole stress process,the symptom level of salt damage was reached up to grade 2,the leaves appeared yellow and scorched.With the stress time longer,the relative electric conductivity and contents of MDA and proline in leaves increased respectively.The contents of chlorophyll b,soluble sugar,soluble protein,SOD and POD activity increased first and then decreased.The contents of chlorophyll and chlorophyll a increased first and then decreased under 100 and 200 mmol·L^-1of NaCl stress respectively,but decreased under 300 mmol·L^-1of NaCl stress.M.denudata had certain ability of salt tolerance,and it could be used in mild saline soil.