淹水对水紫树生长和生理特性的影响

Effects of waterflooding on the growth and physiological characteristics of Nyssa aquatic

通过人工模拟淹水环境,对2年生水紫树进行生长和生理特性观测与分析,以期为水紫树的耐涝性研究的提供理论参考,也为我国沿海和涝害地区耐水湿树种的筛选提供理论依据。结果表明:淹水促进了水紫树地上部分生长,淹水60d苗木侧根和须根数量明显减少,大量不定根形成,且成活率为100%;0~30d水紫树可溶性糖含量与对照无显著差异,后期显著高于对照(P<0.01);ADH活性从淹水第10d开始上升,至第50d的最大值1.24U/mL,随后下降,但仍显著高于对照(P<0.01);SOD活性显著高于对照(P<0.01),呈先上升后下降的趋势;POD在面对淹水时表现不敏感,其酶活性高于对照,但无显著差异(P>0.05);整个淹水过程中,H2O2的含量显著高于对照(P<0.01),并处于一个稳定的状态;MDA含量在第10d之后,淹水处理显著高于对照(P<0.05),整体呈“M”型趋势。

Growth and physiological characteristics of two-year-old Nyssa aquatica were observed and analyzed by artificial simulating waterflooding environment. In order to provide a theoretical reference for the study of the tolerance of N.aquatica, it also provides a theoretical basis for the screening of water-resistant and wet tree species in coastal areas of China. The results show that: the waterflooding promoted the aboveground growth of the N.aquatica. The number of lateral roots and fibrous roots of the 60 d seedlings was significantly reduced, and a large number of adventitious roots were formed, and the survival rate was 100%;The soluble sugar content of N.aquatica was not significantly different from the control from 0 to 30 days, but it was significantly higher than the control at the later stage (P < 0.01);Alcohol dehydrogenase activity (ADH) began to rise steadily from the 10th day after waterflooding to a maximum of 1.24 U/mL on the 50th day, and then decreased, but still higher than the control (P < 0.01);SOD activity was significantly higher than that of the control (P < 0.01), which increased first and then decreased;POD activity was not sensitive in the face of waterflooding stress, and its enzyme activity was higher than that of the control, but there was no significant difference (P > 0.05);During the whole waterflooding process, the content of H2O2 was significantly higher than that of the control and was in a stable state;After the 10th day, the MDA content was significantly higher than that of the control (P < 0.01), and the overall trend was “M”.