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Boran Ji(Boran Ji),Hayan Lee(Hayan Lee),Kyungtae Park(Kyungtae Park),Sang Yeob Lee(Sang Yeob Lee),Bo-Kook Jang(Bo-Kook Jang),In Hwan Chae(In Hwan Chae),Chung Youl Park(Chung Youl Park),Sung Pil Kwon(S 한국자원식물학회 2022 한국자원식물학회지 Vol.35 No.6
The demand for Chelidonium majus L. subsp. asiaticum H. Hara is expected to increase due to its pharmacological properties such as antibacterial, antioxidant, and anti-inflammatory effects. However, an effective propagation system for this species has not yet been established. This study was conducted to analyze the seed dormancy and germination characteristics of C. majus L. subsp. asiaticum H. Hara native to Korea and establish a mass propagation system. The dormancy type was primarily classified by analyzing the general information of the collected seeds. The seed dormancy breaking was investigated by comparing the effects of cold stratification (0, 2, 4, 8, 10, or 12 weeks) with warm stratification (S, summer temperature, 25/15°C) and intermediate temperature stratification (A, autumn temperature, 15/10°C) of alternating temperature stratification (S12-A4 or S12-A8 weeks). After dormancy break, 500 ㎎/L GA3 and GA4+7 treatment replaced cold stratification and improved seed germination. The results of this study are expected to provide basic data for future seed propagation and mass propagation by analyzing the dormancy and germination characteristics of C. majus L. subsp. asiaticum H. Hara seeds.
Boran Ji,Kyungtae Park,Sang Yeob Lee,Hamin Lee,Bo-Kook Jang,Sung Pil Kwon,Ju-Sung Cho 한국원예학회 2021 한국원예학회 학술발표요지 Vol.2021 No.10
Fallopia sachalinensis (F.Schmidt) RonseDecr. is an herbaceous perennial herb and their rhizomes and leaves are used as medicines for constipation and rheumatism. This study was carried out to identify the seed dormancy type of F. sachalinensis and to explore the conditions for the dormancy break. The seeds were harvested in Ulleungdo, October 2020, then they were dry stored at room temperature after cleaning. The major and minor axis of the seed were 3.18 ± 0.087 and 2.22 ± 0.070 mm, and the weight of one hundred seeds was 2.01 ± 0.035 g. The vigor of the seeds was 66% and had E:S ratio of 0.90 ± 0.015 confirming that the embryos were morphologically mature. The moisture content of the seeds was 17.34 ± 1.018%, and the maximum moisture content 54.74 ± 0.740% was reached on the 3 day of water absorption. Initial germination experiments were performed for 30 days in chambers with different temperatures (15, 20, 25, 30°C) and 25/15°C (16/8h light/dark). Germination was recorded every day except for those in dark. To confirm the germination enhancement through after-ripening and gibberellin, seeds that had been matured at room temperature for 3 months were immersed in distilled water and 500 ppm GA₃ and GA4+7 solution for 3 days each then incubated at 25/15°C chamber. Alternating temperature stratification was performed at autumn temperature (AT, 15/10°C, 16/8h) for 4 weeks, then continued to winter temperature (WT, 4°C, 24h) for 0, 4, 8, 12 weeks and seeds were incubated at 25/15°C chamber. WT stratification was performed for 4, 8, 12 weeks and the seeds were incubated at 15/10°C (16/8h, light and dark) or 25/15°C chamber. As a result, the percent germinations of seeds before stratification were 19.5 ± 2.63 and 16.5 ± 4.35 respectively under the light/dark conditions of 30°C and 25/15°C. The percent germination was less than 10% in the constant temperature conditions below 25°C including dark conditions. For GA₃ and GA4+7 treatments, the percent germinations were 33.5 ± 5.50 and 42.0 ± 3.37%, respectively, but there was no significant difference from the control (29.0 ± 4.36%), which confirmed the need for the after-ripening period at room temperature. The percent germination was 56.0~61.0% in all alternating temperature stratifications, and there was no significant difference between them. T50 ranged from 6.5 to 2.1d which tended to be shortened as the WT stratification period increased. As a result of varying temperatures after WT stratification, the percent germination was 60.0~65.0% at 15/10°C and T50 was 5.9~4.3d. The percent germination at 25/15°C was 69.0~72.0% and T50 was 5.6~2.6d, which tended to be shorter as the stratification period was longer. In conclusion, F. sachalinensis seeds are expected to be having physiological dormancy, and this dormancy can be broken by the WT stratification. It is considered as a method to break dormancy as well as to induce rapid germination, and to expect a percent germination comparable to the vigor value of the seeds.
Hamin Lee,Boran Ji,Bo-Kook Jang,Kyungtae Park,Sang Yeob Lee,Kyunggu An,Ju-Sung Cho 한국원예학회 2022 원예과학기술지 Vol.40 No.2
In this study, we assessed the effect of hydropriming and light quality treatments on the antioxidant activity and bioactive compounds in Brassica oleracea var. capitate sprouts. B. oleracea seeds were soaked in distilled water and treated with different light wavelengths or in complete darkness for 24 h at 20 ± 1°C. Subsequently, the treated seeds were dried for 24 h, sown on sprouting trays, and then incubated for seven days at 25 ± 2°C under a 16/8 h light/dark photoperiod with white LEDs. The final percent germination of B. oleracea sprouts was 82.3-95.7%. The fresh weight and shoot length increased significantly in all hydropriming and light quality treatments when compared to the control (soaked in water for 24 h in darkness with no drying). We tested different solvents for extracting bioactive compounds and determined their radical scavenging activity and found that 80% ethanol was the best solvent. Hydro-primed sprouts exhibited significant differences in bioactive compounds and antioxidant activity between the different light treatments. In particular, the blue light treatment resulted in a total flavonoid content and DPPH radical scavenging activity (RC<SUB>50</SUB>) of 157.2 mg naringin equivalent (NE)·g<SUP>-1</SUP> and 1.27 mg·mL<SUP>-1</SUP>, respectively, and was the most effective treatment for increasing bioactive compounds and antioxidant activity. Therefore, the combined germination pretreatments of hydropriming and light quality induced significant changes in bioactive compounds and antioxidant activity of B. oleracea sprouts.