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Effects of Auxin and Cytokinin Application on Leaf Cutting Propagation in Echeveria Species
Raisa Aone Cabahug,Soon-Yil Soh,Sang Yong Nam 한국화훼학회 2016 화훼연구 Vol.24 No.4
A study was conducted to evaluate the effects of auxin, cytokinin, and their combined application to hasten their propagation using leaf cuttings. Different hormone levels were evaluated on two Echeveria species (E. subsessilis and E. runyonii). Three levels of auxin as represented by the use of indole-3-butyric acid (IBA) (0, 100, and 500 ppm), three cytokinin levels as represented by Kinetin (Ki) (0, 100, and 200 ppm) and their combination were applied and observed for 8 weeks. The use of 100 ppm IBA resulted in the highest shoot height, diameter, and rooting and shooting rate. Using 500 ppm IBA led the roots to develop the earliest but both species also had the highest mortality. The application of 100 ppm Ki significantly affected the majority of leaf cuttings of E. runyonnii which exhibited the highest and thickest shoots, and the number of leaves. The application of 100 ppm IBA and 100 ppm Ki is recommended to obtain increased shoot growth and development for leaf cuttings. In the case of single hormone use, the application of 100 ppm IBA may be preferable. The combination of auxin and cytokinin significantly stimulated the hastening of production of succulents using leaf cuttings.
Growth of Crassulaceae Succulents as Influenced by Leaf Cutting Type and Planting Position
Raisa Aone Cabahug,Soon-Yil Soh,Sang Yong Nam 한국화훼학회 2016 화훼연구 Vol.24 No.4
Growth and development of succulents were studied in response to two leaf cutting types, the tip and base, using four Echeveria species (E. ‘A Grimm One’, E. ‘Momorato’, E. pulvinata ‘Frosty’, and E. pulidonis) and the planting position, either upright and faced-downward, using Graptoveria optalina. The shoot diameter (mm), height (mm), and number of leaves were significantly affected by the leaf cutting type. Results revealed that the shoot diameter of buds from base leaves were significantly larger by 4 - 9 times than those of buds from tip leaves. Shoot height of buds from tip leaves either not developed or reached a maximum of 2.29 mm while buds from base leaves had an average height of 11.61 mm from E. ‘Mamorato’. Using base leaves allowed to obtain roots and leaves for all selected succulent species after 60 days from planting. Regarding planting position, upright planted and downward-facing plants showed significant differences: buds from upright planting showed taller shoots, greater number of leaves which in turn gave higher visual quality rating and superior color reading using Hunter’s Cielab compared with buds in downward-facing planting position. Planting succulents in an upright position led to well-formed shoots and roots which had a high-quality rating and color evaluation compared with faced-downward planting producing etiolated and abnormal grown shoots. Based on these findings, we suggest that the use of base leaf cuttings and an upright planting position provides a rapid vegetative propagation method for selected succulent varieties.
Raisa Aone M. Cabahug,소손일,남상용 한국화훼학회 2017 화훼연구 Vol.25 No.4
This study was conducted to determine the effects of light intensity on the growth and development as well as the anthocyanin content of two Echeveria species, namely Echeveria agavoides and E. marcus. Three light intensity levels (high, 150 μmol・m-2s-1; intermediate, 75 μmol・m-2s-1; and low, 35 μmol・m-2s-1) served as the treatments, which were replicated four times. The results revealed that the tallest and largest plants were those under low light conditions. It was observed that there was a decline as the light intensity increased, which is attributed to the coping mechanisms of plants to search for light sources, which has a similar effect to bolting or an increase in the node-to-node distance. CIELAB color values of L* and a* for both species were significantly affected by the light intensity, indicating changes in the lightness of hue and green-to-red color pigmentation in plants. These results were strongly reflected in those of the anthocyanin content analysis, where a direct increase in the concentration was observed with increasing light intensity. The results of the anthocyanin analysis were also supported by the histogram, smart segmentation images, as well as the ratio of red and green pigments found in the images. Thus, a high light intensity should be used to increase the quality and provide conducive growing conditions for both succulent species
Effects of Temperature on the Growth and Anthocyanin Content of Echeveria agavoides and E. marcus
Raisa Aone M. Cabahug,Young Jin Choi,Sang Yong Nam 한국화훼학회 2019 화훼연구 Vol.27 No.2
Few studies have reported how temperature influences growth and development of succulents, including anthocyanin production, which could fetch better prices in the market, and understanding the factors influencing such pigments would benefit farmers. The present study investigated the effect of temperature (10°C, 20°C, and 30°C) on the growth, development, and anthocyanin concentrations in Echeveria agavoides and E. marcus. In E. agavoides, similar growth performance was observed at 10°C and 20°C based on plant height and diameter. However, subjecting the species to a high temperature of 30°C resulted in a decrease in plant height. In E. marcus, optimal growth performance was observed at 20°C. Different temperatures did not significantly affect succulent quality and color hues. Only L* values were significantly different among the Hunter’s Lab values. Similar results were observed following anthocyanin and image analyses, both of which were not significantly affected by temperature. However, an intense red pigment was observed at 20°C compared with the green pigment observed at 10°C and 30°C based on the image analysis. The results suggest that temperature influences growth, development, and anthocyanin content of Echeveria succulents, and 20°C could be the optimal temperature for the cultivation of the species.