자작나무 종자 저장기간 및 온도처리에 따른 발아 특성
Germination Characteristics of Betulaplatyphylla var. japonica Seed by Storage Period and Temperature Treatment
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초록
본 연구는 우리나라의 주요 조림수종인 자작나무(Betulaplatyphylla var. japonica Hara.) 종자의 저장기간 및 온도처리에 따른 발아 특성을 구명하고자 수행되었다. 공시수종 종자는 각각 1996년, 2003년, 2012년, 2013년, 2014년, 2015년, 2016년 채집된 자작나무 종자이며, 발아실험은 5℃, 10℃, 15℃,20℃, 25℃, 30℃, 35℃의 온도 조건에서 실시하였다. 저장기간에 따른 발아율(GR)의 조사 결과 2012년 이전에 채집된 종자에서는 발아가 전혀 되지 않았다. 저장기간별 발아율은 2015년에 채집된 종자가모든 온도에서 가장 높았고, 저장기간이 길어질수록 낮은 것으로 조사되었다. 온도별 발아율의 경우 15℃ 이하의 온도 조건에서는 모든 종자에서 발아가 전혀 되지 않고, 30℃에서 가장 높은 발아율을 보였다. 그 외의 발아특성은 저장기간이 짧은 종자이고 발아율이 높은 온도일수록 발아기(T50)와 평균발아일수(MGT)가 낮고 발아속도(GS)가 높은 경향을 보였다. 발아균일도(GU)는 상대적으로 고온인 35℃에서높은 것으로 나타났다.
Abstract
This study was carried out in order to survey the effect of storage period and temperaturetreatment on germination characteristics and the optimum, minimum, and maximum temperaturefor seed germination of Betulaplatyphylla var. japonica Hara., which are major productive treespecies in Korea. B. platyphylla var. japonica seeds used in this experiment were produced inthe year 1996, 2003, 2012, 2013, 2014, 2015, and 2016. Germination test was carried out at5℃, 10℃, 15℃, 20℃, 25℃, 30℃, and 35℃ for all seeds. The seeds produced in 1996, 2003,and 2012 were not germinated at all. The seeds produced in 2015 showed the highestgermination rate, followed by the seeds produced in 2016, 2014, and 2013. The seeds were notgerminated at all at 5℃, 10℃, and 15℃. And the seeds showed the highest germination rate at30℃. T50 and mean germination time got lower and germination speed got higher at shorterseed storage period and temperature for higher germination rate. As for germination unity, itwas surveyed to get much higher at 35℃ than the other temperatures.
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