Zhang Qilei, Chen Guangxin, Huang Jundong, Peng Changlian
Guangdong Provincial Key Laboratory of Biotechnology for Plant Development, School of Life Sciences, South China Normal University, Guangzhou 510631, China.
Plants (Basel). 2020 Sep 18;9(9):1227. doi: 10.3390/plants9091227.
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 (an alien invasive species) and (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 was the slowest, that of was the fastest, and that of the hybrid was in the middle. Compared with and the hybrid, accumulated more abscisic acid (ABA) in leaves to control water loss. After the leaves were detached, 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 and its hybrid, the leaves of 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 , but higher than that of . They showed that the drought resistance of the hybrid may be higher than that of , and it might threaten the survival of .
在生物入侵过程中，入侵物种与本地物种之间的杂交十分常见，这可能导致形成适应性更强的杂种。在华南地区已发现（一种外来入侵物种）与（一种本地同属物种）的杂种。在我们之前的研究中，我们发现该杂种在镉胁迫下表现出杂种优势。然而，本实验结果表明，该杂种在控制水分流失方面，其叶片并无杂种优势。结果显示，[物种A]的水分流失率最慢，[物种B]的最快，杂种的则处于中间。与[物种A]和杂种相比，[物种B]在叶片中积累了更多脱落酸（ABA）以控制水分流失。叶片脱离后，[物种B]的叶片受损最严重，最大光化学效率最低，膜脂过氧化最严重，丙二醛和活性氧的积累量最大。与[物种A]及其杂种相比，[物种B]的叶片能够积累更多抗氧化酶和抗氧化剂，总抗氧化能力最强。结果表明，杂种减少水分流失的能力低于[物种A]，但高于[物种B]。结果表明，杂种的抗旱性可能高于[物种B]，并且可能威胁到[物种B]的生存。
