Abstract
In the process of biological invasion, hybridization between invasive species and native species is very common, which may lead to the formation of hybrids with a stronger adaptability. The hybrid of Wedelia trilobata (an alien invasive species) and Wedelia chinensis (an indigenous congener) has been found in South China. In our previous study, we found that the hybrid showed heterosis under cadmium stress. However, the results of this experiment demonstrated that the leaves of the hybrid had no heterosis in controlling water loss. The results showed that the water loss rate of W. trilobata was the slowest, that of W. chinensis was the fastest, and that of the hybrid was in the middle. Compared with W. chinensis and the hybrid, W. trilobata accumulated more abscisic acid (ABA) in leaves to control water loss. After the leaves were detached, W. chinensis leaves suffered the most serious damage, the lowest maximum photochemical efficiency, the most serious membrane lipid peroxidation, and the largest accumulation of malondialdehyde and reactive oxygen species. Compared with W. chinensis and its hybrid, the leaves of W. trilobata could accumulate more antioxidant enzymes and antioxidants, and the total antioxidant capacity was the strongest. The results demonstrate that the ability of the hybrid to reduce water loss was lower than that of W. trilobata, but higher than that of W. chinensis. They showed that the drought resistance of the hybrid may be higher than that of W. chinensis, and it might threaten the survival of W. chinensis.
Highlights
In the process of plant growth, organisms are subjected to various adverse environmental stresses, among which drought is one of the most common abiotic stresses
W. chinensis wilting with the prolongation of the leaf of in vitro time, which the W.which chinensis the displayed the most obvious performance
The results showed that the abscisic acid (ABA) content of detached leaves increased significantly, and that of W. trilobata was significantly higher than that of W. chinensis and hybrids, which was consistent with the results of water loss
Summary
In the process of plant growth, organisms are subjected to various adverse environmental stresses, among which drought is one of the most common abiotic stresses. The effects of drought stress on plants are mainly reflected in the effects on cell activity and organ and tissue function [1,2]. The metabolic process of cells is blocked, which leads to the accumulation of H2 O2 , 1 O2 , and O2 − in cells [4]. The main component of the cell membrane is the phospholipid bilayer. A large number of reactive oxygen species will damage the properties of the cell membrane. The results of membrane lipid peroxidation are mainly an increase in the malondialdehyde (MDA) content and an increase in the cell membrane permeability [5]. Due to the destruction of the cell membrane and the increase in the permeability, the cell membrane will lose the function of selective passage, resulting in uncontrolled material passing in and out of the cell, resulting in the disorder of the cell metabolic function
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