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일장처리에 따른 스탠다드 절화국화 ‘백마’의 동적 줄기 신장 분석
박규현(Gyu Hyeon Park),이정현(Jeong Hyun Lee) 한국원예학회 2021 원예과학기술지 Vol.39 No.6
The aims of this study were to analyze dynamic stem elongation of standard cut-chrysanthemum (Dendranthema grandiflorum) with different photoperiod levels. Standard cut-chrysanthemum cv. Baekma was grown at a 16 hr photoperiod until 23 days after planting, after that different photoperiods of 8, 10, 12, 14, and 16 hr (8H, 10H, 12H, 14H, 16H) were applied using fluorescent lights in a plant factory. The long-day treatments of 14H and 16H produced no flower buds and the 8H treatment was significantly delayed in flower budding initiation compared to the 10H or 12H treatments. The final characteristics of plant height, plant fresh weight, and number of internodes in the 14H and 16H treatments were significantly higher than in the other treatments. Plant height was significantly fitted with parameters of maximum stem length (y<SUB>asm</SUB>), relative stem elongation rate (k), and days to reach maximum stem elongation rate (t<SUB>inf</SUB>) in the Gompertz growth model as a function of days after planting. As the photoperiod increased longer than 14H, y<SUB>asm</SUB> was continuously increased, t<SUB>inf</SUB><SUB></SUB> was delayed in the 12H-16H treatments, and k was increased between the 8H and 12H treatments and decreased with long day treatments. The maximum stem elongation rate (MGR) was 1.15 cm·d<SUP>-1</SUP> in the 12H treatment, which was the highest stem elongation rate. Plant height and days after planting were translated to relative scales from 0 to 1 and 0 to 1 or 2 respectively. Relative stem length was significantly fitted and described 99% of relative plant height to developmental stage (DVS) with three parameters of maximum relative stem length (y<SUB>asm.DVS</SUB>), relative stem elongation length (k<SUB>DVS</SUB>), and days to reach maximum relative stem elongation rate (t<SUB>inf.DVS</SUB>) in the adjusted Gompertz growth model. y<SUB>asm.DVS</SUB> was no differences between 8H and 12H in short days whereas 14H and 16H were estimated to be 1 and compared to 12H 22% higher at long day treatment. k<SUB>DVS</SUB> was higher in the 14H and 16H treatments than in the 12H treatment, which means the long-day treatment increased growth rapidly to different DVS. t<SUB>inf.DVS</SUB> was estimated to be between 1.143 and 1.224 in the short day treatment and showed the maximum relative growth rate. Maximum growth ratio to DVS was 68% of plant height in 8H, 10H and 12H whereas 14 and 16H were 62% and 63% of plant height reached at t<SUB>inf.DVS</SUB>. Our study suggested that the Gompertz growth model can describe and summarize the dynamic stem elongation pattern of standard cut chrysanthemum ‘Baekma’ and it is advisable to use a 14H photoperiod in long-day conditions and a 12H photoperiod in short-day conditions during the cultivation of ‘Baekma’.
스탠다드 절화 국화 ‘백마’와 ‘백선’의 시계열에 따른 동적 생육 특성 분석
박규현(Park Gyu Hyeon),이영분(Young Boon Lee),이은혜(Eun Hye Lee),이정현(Jeong Hyun Lee) 한국원예학회 2023 원예과학기술지 Vol.41 No.1
This study sought to analyze and compare the growth parameters of the two standard chrysanthemum varieties of ‘Baekma’ and ‘Iwanohakusen’ using the Gompertz and the expolinear growth function to obtain dynamic growth data for a crop growth model and a big data analysis. The photoperiod was processed for 16 hours for 50 days after planting and then for 11.5 hours until the end of the experiment. The plant height, leaf area, and the number of internodes showed a sigmoid growth pattern over time. The dynamics of growth and development of both cultivars are significantly described in measurement datasets for more than 98% R² with the parameters of maximum growth or development (y<SUB>max</SUB>), the relative growth or developmental rate (k), number o f days to reach maximum growth or the developmental rate (t<SUB>inf</SUB>) of the Gompertz growth function. The total fresh weights of both cultivars increase linearly after the exponential increase. The fresh weights for both cultivars over time are significantly described in the measurement data sets by the three parameters of the maximum absolute growth rate (c<SUB>m</SUB>), maximum relative growth rate (r<SUB>m</SUB>), and days to reach the linear growth phase (t<SUB>b</SUB>) of the expolinear growth function (R² > 0.98). The dynamic changes in the plant height, leaf area, and the number of internodes are well described by the parameters of the Gompertz growth function. The total fresh weight is well explained by the parameters of the expolinear growth function. The Gompertz and expolinear growth functions can be useful statistical tools for analyzing and summarizing growth rates of standard chrysanthemums over time. It is concluded that the growth functions and parameters of the dynamics of growth and development of standard cut chrysanthemums can be used as important growth indicators considering the growth time at production sites.