ABSTRACT Acacia mearnsii is a tree species commercially cultivated in Africa and South America. This species requires physical or chemical treatments to overcome physical seed dormancy. In this report, we assessed the effect of different treatments with hot water (40°C for 24 h; 60°C for 5 min; 80°C for 5 min; 90°C for 5 min and 100°C for 5 min) on seed dormancy, rhizobial inoculation (Bradyrhizobium sp. SEMIA 6164 = BR 3608) and two different incubation temperature (20°C and 25°C) on germination of A. mearnsii. The results indicated that the immersion of seeds in hot water at 80°C was the most optimum treatment as indicated by total germination (83.0%), germination index (187.5), germination speed (19.5) and accumulated germination speed (24.5). The elevation of incubation temperature from 20°C to 25°C enhanced the germination index by 7.4%. Inoculation of SEMIA 6164 also increased the speed and accumulated speed of germination by 8.7% and 10.1%, respectively. The present study revealed that the immersion of seeds in hot water at 80°C for 5 min, incubation at 25°C and inoculation with SEMIA 6164 offered the most favourable conditions for the maximum and quick recovery of uniform seedlings and can be recommended for raising the forestry nurseries of A. mearnsii.

中文翻译：

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热水对打破休眠、孵化温度和根瘤菌接种对金合欢种子萌发的影响

摘要金合欢是一种在非洲和南美洲商业种植的树种。该物种需要物理或化学处理来克服物理种子休眠。在本报告中，我们评估了不同热水处理的效果（40°C 24 小时；60°C 5 分钟；80°C 5 分钟；90°C 5 分钟和 100°C 5 分钟）种子休眠、根瘤菌接种（Bradyrhizobium sp. SEMIA 6164 = BR 3608）和两种不同的孵化温度（20°C 和 25°C）对 A. mearnsii 的萌发。结果表明，以总发芽率（83.0%）、发芽指数（187.5）、发芽速度（19.5）和累积发芽速度（24.5）为指标，80℃热水浸泡处理是最佳处理。孵化温度从 20°C 升高到 25°C，发芽指数提高了 7.4%。接种SEMIA 6164也使发芽速度和累积发芽速度分别提高了8.7%和10.1%。目前的研究表明，将种子在 80°C 的热水中浸泡 5 分钟，在 25°C 下孵育并接种 SEMIA 6164 为最大和快速恢复均匀幼苗提供了最有利的条件，可推荐用于培育A. mearnsii 的林业苗圃。