RESUMO
KEY MESSAGE: Overexpressing the copper transporter LbCOPT1 leads to a notable increase in the abundance of mycorrhizal arbuscules that suggests the potential application of LbCOPT1 in breeding programs aimed at enhancing symbiotic nutrient uptake in Lycium barbarum L.
Assuntos
Cobre , Lycium , Micorrizas , Nicotiana , Proteínas de Plantas , Raízes de Plantas , Lycium/metabolismo , Lycium/genética , Lycium/microbiologia , Micorrizas/fisiologia , Proteínas de Plantas/metabolismo , Proteínas de Plantas/genética , Nicotiana/metabolismo , Nicotiana/genética , Nicotiana/microbiologia , Nicotiana/crescimento & desenvolvimento , Cobre/metabolismo , Raízes de Plantas/metabolismo , Raízes de Plantas/microbiologia , Raízes de Plantas/crescimento & desenvolvimento , Regulação da Expressão Gênica de Plantas , Plantas Geneticamente Modificadas , Simbiose , Nutrientes/metabolismoRESUMO
Natural disasters such as landslides often occur on soil slopes in seasonally frozen areas that undergo freezeâthaw cycling. Ecological slope protection is an effective way to prevent such disasters. To explore the change in the mechanical properties of soil under the influence of both root reinforcement and freezeâthaw cycles and its influence on slope stability, the Baijiabao landslide in the Three Gorges Reservoir area was taken as an example. The mechanical properties of soil under different confining pressures, vegetation coverages (VCs) and numbers of freezeâthaw cycles were studied via mechanical tests, such as triaxial compression tests, wave velocity tests and FLAC3D simulations. The results show that the shear strength of a root-soil composite increases with increasing confining pressure and VC and decreases with increasing number of freezeâthaw cycles. Bermuda grass roots and confining pressure jointly improve the durability of soil under freezeâthaw conditions. However, with an increase in the number of freezeâthaw cycles, the resistance of root reinforcement to freezeâthaw action gradually decreases. The observed effect of freezeâthaw cycles on soil degradation was divided into three stages: a significant decrease in strength, a slight decrease in strength and strength stability. Freezeâthaw cycles and VC mainly affect the cohesion of the soil and have little effect on the internal friction angle. Compared with that of a bare soil slope, the safety factor of a slope covered with plants is larger, the maximum displacement of a landslide is smaller, and it is less affected by freezing and thawing. These findings can provide a reference for research on ecological slope protection technology.