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Eun Joo Huh,Young Ran Lee,Seong Youl Choi,Kyung Ran Do,Chun Ho Pak 한국원예학회 2007 Horticulture, Environment, and Biotechnology Vol.48 No.6
Axillary buds formation in non-branching chrysanthemums (Dendranthema grandiflorum) is regulated by temperature. To examine the temperature regime responsible for non-viable buds, five non-branching chrysanthemums cultivars were treated with 5 temperature conditions for 4 weeks. High temperature reduced percentage of lateral buds, but effects varied among the cultivars. Three hybrid progenies of ‘01B1-4’, ‘01B1-8’, and ‘01B1-22’ showed stronger non-branching trait than ‘Iwanohakusen’ and ‘Hakutenga’. In these progenies, the day/night temperature regime of 25/15℃showed similar effects as 28/18℃, 31/21℃, and 34/24℃. Ethephon promoted axillary bud development in ‘01B1-8’, but had no effect on ‘01B1-22’. Histological assay showed that axillary meristems in non-branching chrysanthemum cultivars arrested their development prior to or at meristematic organization and ethephon enhanced the cell differentiation to the axillary meristem.
High Temperature-Induced Flower Abnormalities at Bud Development in Chrysanthemum
Eun Joo Huh,Hak Ki Shin,Kwang Jin Kim,Seong Youl Choi 한국원예학회 2004 Horticulture, Environment, and Biotechnology Vol.45 No.6
The effects of high temperature (HT) on flower development were examined on chrysanthemum [Dendranthema × grandiflorum (Ramat.) Kitamura]. Plants exposed to HT developed two types of abnormal flowers. One formed only ray florets, and the other developed ray florets with bracts at the center of the disk. These abnormal flowers occurred when the plants were exposed to a HT of 35℃ from 14 to 27 days after the start of short day (SD). The most susceptible developmental stage was 14 to 20 days after SD. Having a 4-h HT period before nighttime induced abnormal inflorescence and delayed flowering. This result suggested that HT just before night especially from 14 to 20 days after SD is responsible for abnormal flower formation in a single type of chrysanthemum.
Eun Joo Huh,Soo Kyung Lee,Bong Nam Chung,In Jung Lee,Seong Youl Choi 한국원예학회 2006 Horticulture, Environment, and Biotechnology Vol.47 No.6
Chrysanthemum (Dendranthema × grandiflorum cv, Seifu) infected with chrysanthemum stunt viroid (CSVd) exhibited a stunted phenotype of reduced internode length without change in node number. Flowering response to CSVd infection was variable with mother plant growth conditions. CSVd-infected plants from mother plants maintained in long day condition for 4 months flowered earlier than non-infected plants. On the contrary, those from over-wintered vigorous mother stock flowered 8 days later than non-infected plants. Stunting in chrysanthemum induced by CSVd infection was associated with gibberellic acid (GA) metabolism. GA₁ was the major bioactive GA in chrysanthemum and GA₁ level decreased by half with CSVd infection. Among three late GA biosynthesis pathways, only the third oxidation step (GA₁? to GA₂? and GA₂₄ to GA?) meditated by GA 20-oxidase was disturbed. This result suggests that GA 20-oxidase especially occupying the third oxidation step seems to be the one of the feasible limiting factors associated with decreasing GA₁ levels and stunting symptom in chrysanthemum.
Huh, Joo Young,Lee, Seulah,Ma, Eun-Bi,Eom, Hee Jeong,Baek, Jiwon,Ko, Yoon-Joo,Kim, Ki Hyun TaylorFrancis 2018 Journal of enzyme inhibition and medicinal chemist Vol.33 No.1
<P><B>Abstract</B></P><P><I>Betula platyphylla</I> var. <I>japonica</I> (Betulaceae) has been used traditionally in Asian countries for the treatment of inflammatory diseases. A recent study has reported a phenolic compound, platyphylloside from <I>B. platyphylla</I>, that shows inhibition on adipocyte differentiation and induces lipolysis in 3T3-L1 cells. Based on this finding, we conducted phytochemical analysis of the EtOH extract of the bark of <I>B. platyphylla</I> var. <I>japonica,</I> which resulted in the isolation of phenolic glycosides (<B>1</B>–<B>4</B>). Treatment of the isolated compounds (<B>1</B>–<B>4</B>) during adipocyte differentiation of 3T3-L1 mouse adipocytes resulted in dose-dependent inhibition of adipogenesis. In mature adipocytes, arylbutanoid glycosides (<B>2</B>–<B>4</B>) induced lipolysis related genes HSL and ATGL, whereas catechin glycoside (<B>1</B>) had no effect. Additionally, arylbutanoid glycosides (<B>2</B>–<B>4</B>) also induced GLUT4 and adiponectin mRNA expression, indicating improvement in insulin signaling. This suggests that the isolates from <I>B. platyphylla</I> var. <I>japonica</I> exert benefial effects in regulation of adipocyte differentiation as well as adipocyte metabolism.</P>