Physilo ogical Mechanism of Lagerstroemia speciosa L.Seedil ngs under Salt Stress
A hydroponic experiment was conducted to investigate the physiological mechanism of Lagerstroemia speciosa L.in re-sponse to salt stress.Six treatments with various salt contents (0,0 .2, 0.4, 0.6, 0.8 and 1.0%) were employed and ar-ranged by a completely randomized design with ten replications.Low contents (0.2 to 0.4%) of the stress had some roles in promoting to seedling growth, but high contents (0.6 to 1.0%) of the stress had inhibited seedling growth, while the effect of salt stress on the aerial parts was more than that on the roots.With the extension of stress time and the NaCl content ris-ing, the protective enzyme ( SOD, POD and CAT) activities were increased at the beginning and decreased afterwards, conductivity and MDA content were continuously increased.With the extension of stress time, the proline content increased at the low and medium concentrations, while increased and then decreased at the severe concentrations.With the increas-ing of NaCl, the total chlorophyll content increased and then decreased.Lagerstroemia speciosa L.had a certain ability to resist the salt stress.L agerstroemia speciosa L.improved the characteristic of resistance to salt stress by increasing the activ-ities of protective enzyme and optimizing the biomass allocation of organs.Under the severe contents, beyond the scope of the antioxidant system protection, salt stress on the plants also increased the damage, and the growth was severely affected.
Lagerstreo mia speciosa L.Salt stressActivities of protective enzymeChlorophyllMDA
NETL
NSTL
万方数据
维普
