Changhoo Chun

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Elucidation of the roles of circadian associated factors requires a better understanding of the molecular mechanisms of circadian rhythms, control of flowering time through photoperiodic pathways, and photosensory signal transduction. In Arabidopsis, the APRR1 quintet, APRRs 1, 3, 5, 7, and 9, are known as central oscillator genes. Other plants may share(More)
Embryos derived from isolated microspore culture are of great importance for producing homozygous plants for breeding. Microspore culture can reduce time and laborious effort in the breeding of Brassica plants. Microspore derived embryos (MDE) formation in broccoli (Brassica oleracea L. var. italica Plenck) was studied with different plant growth regulators(More)
This study was conducted to investigate the effect of grafting using commercial rootstocks and breeding lines on growth and resistance to both Phytophthora blight (Phytophthora capsici) and bacterial wilt (Ralstonia solanacearum), and to evaluate the breeding lines as candidates rootstocks for grafted peppers. Capsicum annuum ‘Nokkwang’ (scion) was grafted(More)
Anatomical differences between embryogenic and non-embryogenic calli ofPimpinella brachycarpa were investigated by light microscopy and electron microscopy. Initial callus tissue emerged from expiants after 14 d of culturing. The embryogenie calli (EC) were firm, rather opaque, and light yellow in color. The cells usually formed small, compact clusters.(More)
Quality changes of highbush blueberry cultivars (Vaccinium corymbosum L. cvs. Bluetta, Duke) were evaluated as influenced by transport temperature. Neither cultivar remained marketable after 6 days or 16 days at room temperature or 10°C. The ‘Duke’ cultivar had slightly lower weight loss than ‘Bluetta,’ but difference between the cultivars was not(More)
Healing and acclimatization are key processes for the survival of grafted plants. This study evaluated the influence of light intensity (photosynthetic photon flux, PPF) and relative humidity during the healing and acclimatization period on the photosynthetic characteristics, graft-take, and growth of grafted cucumber (Cucumis sativus L.) seedlings, using a(More)
Variation in bioactive compounds content was assessed in antioxidant rich June-bearing strawberry cultivars. Ascorbic acid, anthocyanin, and ellagic acid content were analyzed in ripe fruits of 14 cultivars. The bioactive content in strawberry fruit was found to vary significantly among cultivars and from year to year. The highest ascorbic acid content was(More)
Composition of nutrient media, flower bud size, sucrose concentration, heat shock stress, and ethylene inhibitor could have marked effects on microspore embryogenesis. No microspore-derived embryos (MDE) were formed when the microspores were isolated from radish (Raphanus sativus L.) flower buds of 1.0–2.5 mm in size, whereas MDE were formed with(More)
Changes in physicochemical characteristics were investigated during fruit development in ‘Maehyang’, ‘Seolhyang’, ‘Keumhyang’, ‘Akihime’, and ‘Red Pearl’ strawberries. Fresh weights and color parameters of strawberry fruits changed significantly during the fruit development in all cultivars. Fruit shapes of ‘Maehyang’ and ‘Akihime’ were conical, with an(More)
Carboxylation efficiency in fully expanded leaves of strawberry (Fragaria × ananassa cv. Maehyang) was estimated based on net CO2 assimilation rate (A n) as a function of chloroplastic CO2 concentration (C c). To estimate the mesophyll conductance (g m) and then construct A n-C c curves, A n and electron transport rate as a function of intercellular CO2(More)