Key message Acacia longifolia and Acacia mearnsii exhibit different reproductive behavior (viability, germination, and dormancy) in relation to fire and seed maturation. The potential of invasion of A. longifolia is stronger than that of A. mearnsii . A. longifolia germinates abundantly between fires and after fires, while A. mearnsii only germinates after fire and needs higher thermal thresholds to break dormancy. Context Fire affects environments through the modification of biological processes such as seed viability, dormancy, and germination. Seed maturation stage can modulate seed response to fire. Invasive alien species could be enhanced by forest fires. Aims To analyze the viability, germination, and dormancy of two invasive alien species ( Acacia longifolia and Acacia mearnsii ) in relation to fire and seed maturation. Methods Viability of seeds was obtained performing a tetrazolium test. Additionally, we obtained germination and dormancy in mature and fresh seeds simulating fire conditions through different levels of fire factors (smoke, ash, charcoal, and heat). Results Control viability of seeds was 100% in the two Acacia species and maturation stages and severe heat reduced it to zero. Germination of A. longifolia varied depending on the maturation stage, being higher in fresh seeds. In A. mearnsii , germination did not change with maturation. In both species, heat stimulated germination by breaking seed dormancy. Seed maturation stage and fire factors affect the germination speed of each species differently. Conclusion Fire reduces viability, stimulates germination, and breaks dormancy of the two species. Seed maturity exerts notable effects on A. longifolia reproductive behavior.

中文翻译：

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火和种子成熟推动了两种入侵物种的活力、休眠和萌发：长叶金合欢 (Andrews) Willd。和 Acacia mearnsii De Wild

关键信息 Acacia longifolia 和 Acacia mearnsii 表现出与火和种子成熟相关的不同繁殖行为（活力、发芽和休眠）。A. longifolia的入侵潜力比A. mearnsii强。A. longifolia 在火灾之间和火灾后大量发芽，而 A. mearnsii 仅在火灾后发芽，需要更高的热阈值来打破休眠。背景火通过改变生物过程（如种子活力、休眠和发芽）来影响环境。种子成熟阶段可以调节种子对火的反应。森林火灾可能会增加外来入侵物种的数量。目的 分析两种外来入侵物种（长叶金合欢（Acacia longifolia）和金合欢（Acacia mearnsii））的生存力、萌发和休眠与火和种子成熟的关系。方法通过四唑鎓试验获得种子的活力。此外，我们通过不同水平的火灾因素（烟、灰、木炭和热量）模拟了火灾条件，在成熟和新鲜种子中获得了发芽和休眠状态。结果在两种金合欢属种和成熟阶段，种子的对照存活率为100%，严重的高温将其降低到零。A. longifolia 的萌发取决于成熟阶段，在新鲜种子中更高。在 A. mearnsii 中，萌发不随成熟而改变。在这两个物种中，热通过打破种子休眠来刺激发芽。种子成熟阶段和火灾因素对每个物种的发芽速度影响不同。结论火降低了两个物种的生存力，刺激了萌发并打破了休眠。种子成熟度对 A.