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http://dx.doi.org/10.5141/JEFB.2002.25.2.093

Effects of Some Environmental Factors on the Germination of Seeds in Ambrosia artemisiifolia var. elatior  

김종홍 (자연과학대학 생명과학전공)
김원희 (자연과학대학 생명과학전공)
차승희 (순천대학교 교육대학원 생물교육전공)
Publication Information
The Korean Journal of Ecology / v.25, no.2, 2002 , pp. 93-100 More about this Journal
Abstract
In order to analyze the life cycle of A. artemisiifolia var. elation dormancy and some environmental factors inducing germination of the seeds were examined. The results were as follows : Dormancy of fertile seeds was broken in part within a month after seed collection in case of adequate moisture and alternating temperature was also effective in breaking dormancy. The temperature range, which allow germination was 12℃ ∼ 32℃. Optimum temperature for germination was 24℃. The seed of A. artemisiifolia var. elatior was light-independent. The difference of storage period appeared to have no particular effect on the viability of seeds at any time during the 9-month storage period. In the increasing temperature(IT) regime, A artemisiifolia var. elatior seeds started to germinate at 16℃, showing the higher temperature the greater germination rate, the final germination percentage was 99.34%. On the other hand, in the decresing temperature(DT) regime, seeds began to germinate at 20℃ with the 1.34% germination. An induced dormancy occurred at 12℃ making the 5.34% fecal germination in the DT regime. Low temperature was more effective to break dormancy than higher temperature Seeds of A. artemisiifolia var. elatior seems to be germinated in mid to late autumn or germination delayed until following spring. The above results suggest these variation of germination response in diverse environmental factors seems to be a physiological strategy to maintain their existence and to reproduce in the extreme thermal variation.
Keywords
Ambrosia artemisiifolia var. elation; Break dormancy; Dormancy; Environmental factor; Germination of seed; Soil moisture;
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