조경용 상록활엽수로서 종가시나무의 종자발아 및 유묘생장 특성

Seed Germination and Seedling Growth of Quercus glauca as Landscaping Broad-leaved Evergreen Tree

The seeds and seedling of broad-leaved evergreen trees are being required to improve urban landscaping and ecology in winter season. This study was carried out to investigate the characteristics of seed germination and seedling growth of Quercus glauca with seed collecting time and seed size. From Nov. 15, 2011 to Feb. 15, 2012, the seeds were collected at 4 different times with 30 days increment from the plants grown at Southern Forest Research Center in Jinju (N35°09’58.62”, E128°06’23.42”, 67m) and divided into 3 groups (small, middle and large grain) according to the size within each collecting time. The characteristics of seed itself, seed germination, and seedling growth were evaluated with the days of collection (collecting time) and seed size. The water content of seeds gradually increased as the days of collection increased between Nov. 15, 2011 and Jan. 15, 2012. The number of damaged embryos (%) also increased with the days of collection during the experiment and the large grains were significantly damaged more than the others. Seed germination was correlated with the days of collection (r=-0.824, p<0.01) and the number of damaged embryos (r=-0.644, p<0.05), but not correlated with seed size. The germination rate was high until Dec. 15, 2011, but decreased from Jan. 15, 2012. The germination rate, germination index, and T50 also showed better between Nov. 15 and Dec. 15, 2011 compared with those values during the rest period. Total dry weight as a variable of seedling growth was correlated with seed length*width (r=0.785, p<0.01), but not correlated with the days of collection. Total dry weight showed higher in large and middle grains than in small grains. Seedling quality index (SQI) showed higher between Nov. 15 and Dec. 15, 2011. Therefore, it could be suggested that we would select larger grains among the seeds harvested through December to obtain better seedlings.