PDF(Pubmed)
Abstract：
Hybridization is common between invasive and native species and may produce more adaptive hybrids. The hybrid (Sphagneticola × guangdongensis) of Sphagneticola trilobata (an invasive species) and S. calendulacea (a native species) was found in South China. In this study, S. trilobata, S. calendulacea, and Sphagneticola × guangdongensis were used as research materials to explore their adaptability to flooding stress. Under flooding stress, the ethylene content and the expression of key enzyme genes related to ethylene synthesis in Sphagneticola × guangdongensis and S. calendulacea were significantly higher than those in S. trilobata. A large number of adventitious roots and aerenchyma were generated in Sphagneticola × guangdongensis and S. calendulacea. The contents of reactive oxygen species and malondialdehyde in Sphagneticola × guangdongensis and S. calendulacea were lower than those in S. trilobata, and the leaves of S. trilobata were the most severely damaged under flooding stress. The results indicate that hybridization catalyzed the tolerance of Sphagneticola × guangdongensis to flooding stress, and the responses of Sphagneticola × guangdongensis to flooding stress were more similar to that of its native parent. This suggests that hybridization with native relatives is an important way for invasive species to overcome environmental pressure and achieve invasion.
摘要：
杂交在入侵物种和本地物种之间很常见，并且可能会产生更多的适应性杂种。在中国南方发现了三叶草（一种入侵物种）和金盏花（一种本地物种）的杂种（Spgnumeticola×广根）。在这项研究中,S、三叶菌，美国金盏花，以Sphagnerticola×gigongensis为研究材料，探讨了它们对洪水胁迫的适应性。在洪水压力下，与乙烯合成相关的乙烯含量和关键酶基因的表达显著高于三叶草。在蛇床子×广根和金盏花中产生了大量的不定根和细胞。蛇床子和金盏花中活性氧和丙二醛的含量低于三叶草，在洪水胁迫下，三叶草的叶子受到的破坏最严重。结果表明，杂交催化了蛇床子对洪水胁迫的耐受性，Spgneumticola×agongensis对洪水胁迫的响应与其本地亲本更相似。这表明与本地近缘种杂交是入侵物种克服环境压力并实现入侵的重要途径。
