Characteristics of Seed and Germination of Rhododendron mucronulatum by Collection Dates and Germination Temperatures
2018
Choi, K.S., Baekdudaegan National Arboretum, Bonghwa, Republic of Korea | Song, K.S., Korea Forestry Promotion Institute, Seoul, Republic of Korea | Koo, D.E., National Forest Seed and Variety Center, Choongju, Republic of Korea | Lee, H.N., Konkuk University, Seoul, Republic of Korea | Sung, H.I., Konkuk University, Seoul, Republic of Korea | Kim, J.J., Konkuk University, Seoul, Republic of Korea
This study was carried out in order to secure basic data of seedling mass propagation technique of Rhododendron mucronulatum which is the native tree species of Korea by surveying the characteristics of its fruit and seed. The fruits were collected at Mt. Goryeo in Ganghwa-gun on different dates in 2013; August 26th, September 5th, September 12th, October 4th. The seed germination test was carried out at 5, 10, 15, 20, 25 and 30℃. Moisture content of the fruit was highest (54.5%) in the fruit collected on September 5th. Number of the seeds in a fruit was 91.3 to 116.3, regardless of the collection date. Seed length was highest (1947.4 ㎛) in the seeds collected on October 4th and seed width was highest (727.3 ㎛) in the seeds collected on September 12th. Germination rate of the seeds was highest at 25℃ regardless of the seed collection date, which showed the highest value(27.3%) in the seeds collected September 12th. Meanwhile, the seeds were not germinated not at all at 5, 10 and 30℃. T50 and mean germination time of the seeds got shorter at the higher temperature. Germination uniformity got lower when the collection date got later. Germination speed of the seeds was fastest at 25℃. According to the results of this study, it seems that the appropriate time to collect fruit and seed is between September 12th and October 4th, and the appropriate temperature for the seed germination is 25℃.
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