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Naing, Aung Htay,Jeon, Su Min,Park, Jun Seong,Kim, Chang Kil,Charles, M. T. Canadian Science Publishing 2016 Canadian journal of plant science Vol.96 No.3
<P> The effects of supplementary lighting with high-pressure sodium (HSP) lamps alone or in combination with carbon dioxide (CO2) on the growth, yield, and flower stem quality of two rose cultivars (‘Loving Heart’ and ‘Top Grace’) were studied. Compared to natural lighting (control), supplementary lighting alone was beneficial for plant growth, and it increased plant height, stem diameter, and the number of axillary shoots. Furthermore, increases in flower stem yield (@@>@@70 cm), flower stem diameter, fresh weight, and the number of petals per flower were also observed. The combination of supplementary lighting and CO2 significantly enhanced all of the studied parameters compared to supplementary lighting alone. Moreover, stomatal density and chlorophyll fluorescence were seemingly affected by either supplementary lighting alone or in combination with CO2. This is the first study to examine the beneficial effects of combined supplementary lighting and CO2 conditions, and the resulting information is essential to rose growers and commercial production. </P>
Naing, Aung Htay,Park, Da Young,Park, Kyeung Il,Kim, Chang Kil SpringerOpen 2018 3 Biotech Vol.8 No.9
<P>We investigated the expression of anthocyanin structural genes and transcription factors (TFs) associated with varying anthocyanin content during different developmental stages (S1-S4) of the gerbera cultivars Nathasha' and 'Rosalin'. Accumulation of anthocyanin started at S1 and reached a maximum at S3 in both cultivars. Enhancement of anthocyanin content in Nathasha' was associated with upregulation of ANS and MYB10, whereas in 'Rosalin', upregulation was associated with CHS1, MYB10, and MYC1 . Low-temperature exposure (6 degrees C) enhanced anthocyanin content to a greater extent than that at 22 degrees C via stronger upregulation of CHS1 and MYB10 in Nathasha' and CHS1 in 'Rosalin', irrespective of flower developmental stage. However, differences in anthocyanin content between the two cultivars were found to be influenced by the expression levels of all structural genes and TFs, irrespective of flower developmental stage and temperature conditions. We suggest that differences in the regulation mechanisms of anthocyanin biosynthesis and coloration pattern between Nathasha' and 'Rosalin' are related to differences in the expression patterns of structural genes and TFs; however, further functional studies of the key genes in anthocyanin biosynthesis are needed.</P>
Optimization of Embryogenic Callus Induction and Plant Regeneration in Orchid Coelogyne cristata
Aung Htay Naing,Ki Byung Lim 한국원예학회 2011 원예과학기술지 Vol.29 No.3
An efficient protocol was established for high frequency somatic embryogenesis through a callus culture of Coelogyne cristata. The best frequency of callusing was obtained from a PLB segment (3-5 ㎜) cultured on MS medium supplemented with coconut water (CW) and a combination of both 3 mgㆍℓ?¹ of 2,4-D and BA. When the calli were sub-cultured on the MS medium without any PGRs, the average number of somatic embryos were higher than those with PGRs treatment. NAA is the most critical factor among PGRs, which dramatically hindered for the formation of a somatic embryo. The efficacy of the addition of coconut powder (CP) for somatic embryogenesis was almost the same in all treatments. However, the number of somatic embryos formed distinctly depended on age of the callus. The somatic embryos converted into healthy plants with well-developed shoots on the same medium. Plantlets showed the best responses of root and shoot growth when transferred to ½ MS medium containing 1.5 gㆍℓ?¹ of activated charcoal. All plants with above 3.0-㎝-high were successfully acclimatized in the greenhouse.