Seed germination of Rhodomyrtus tomentosa
Rhodomyrtus tomentosa (Myrtaceae) is a tropical and subtropical shrub of southern and south-eastern Asia. We studied the effect of temperature, light, chemical pretreatments and storage on its seed germination, and that of soil type and sowing depth on seedling emergence. 15-25°C was the optimum temperature range for germination. Light significantly improved germination of fresh seeds, but storage decreased the light-sensitivity of germination. Soaking for 24 hours in 250-600 mg L -1 gibberellic acid, 5-20% potassium nitrate or 10% hydrogen peroxide solution increased seed germination, whilst 100-500 mg L -1 naphthylacetic acid solution significantly inhibited germination. Following dry storage of seeds, the germination of those stored at 5-15°C was significantly higher than that of those stored at -20°C. For in-fruit storage, storage at 5 and 10°C resulted in significantly higher germination than storage at -20 or 15°C. Dry storage at 5, 10 and 15°C resulted in higher germination than wet storage at the same temperature. Seedling emergence in sand was significantly higher than in loess, garden soil and vermiculite. Emergence was significantly greater for seeds sown in sand at a depth of 1 cm compared with seeds sown at 3 cm, and no seedlings emerged from seeds sown at 5 cm. To propagate seedlings of this shrub, storing seeds at 5-10°C, pre-soaking for 24 hours in 250-600 mg L-1 gibberellic acid, 5-20% potassium nitrate or 10% hydrogen peroxide solution, incubation at 15-25°C and sowing at a depth of 1 cm in sand are helpful for obtaining high germination and seedling emergence.
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Document Type: Research Article
Publication date: August 1, 2013
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