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Naju, South Korea

Na Y.-G.,Horticulture Research Division | Kim W.-S.,Chonnam National University | Choi H.-S.,South Korean National Institute of Animal Science
Journal of Plant Nutrition | Year: 2013

Calyx-end browning in 'Fuyu' persimmon (Diospyros kaki Thumb.) fruits was investigated to learn how meteorological factors and calcium (Ca) concentrations in soil, fruiting shoot, and fruit were related to the symptom occurrences, how longitudinal sections in fruits and fruiting height contribute nutrient partitioning of fruits, and how Ca soaking into fruits affects the cell structure in the flesh. Low humidity with extended radiation reduced fruit browning. Fruiting shoots without browning fruits had greater Ca and lower potassium (K) concentrations than the shoots with browning fruits. Proximal flesh had a greater Ca concentration than middle and distal end parts in calyx-end browning fruits that had lower ratios of Ca:K, Ca:magnesium (Mg), and Ca:K+Mg. Nutrient concentrations were similar to the fruiting height within a canopy, except for manganese, and boron. Calcium dipping into fruit under a vacuum increased Ca concentration in flesh and core parts, which had apparent cell wall strength. © 2013 Copyright Taylor and Francis Group, LLC.

Choi M.P.,South Korean National Institute of Animal Science | Choi M.P.,National Institute and Ecology | Joung H.Y.,South Korean National Institute of Animal Science | Kang Y.-I.,South Korean National Institute of Animal Science | Ko J.-Y.,Horticulture Research Division
Korean Journal of Horticultural Science and Technology | Year: 2014

This study was conducted to investigate the effects of pretreatment and shipping temperature on leaf chlorosis in cut Lilium Oriental hybrid ‘Siberia’. Cut lilies were shipped under various temperatures (5, 10, 15, 25°C) for 5 days. When cut lilies were shipped at 25°C, leaf chlorosis was accelerated. However, chlorosis was significantly decreased by shipping at 5 to 15°C. In addition, leaf chlorosis was significantly decreased when the cut lilies were pretreated with a solution containing Promalin (BA + GA4+7) as compared to the control. Promalin completely prevented postharvest leaf chlorosis, whereas GA3 and Chrysal SVB were ineffective. Leaf chlorosis decreased more with Promalin dip treatment than with spray treatment. This pretreatment solution also extended the vase life of cut lilies. When cut lilies were pretreated with Promalin, yield (Fv/Fm) of chlorophyll fluorescence was highly maintained. Especially chlorophyll content was significant increased by Promalin treatment. Thus, shipping between 5 and 15°C and Promalin dip pretreatment significantly decreased leaf chlorosis in cut ‘Siberia’ lilies. © 2014 Korean Society for Horticultural Science.

Kang Y.-I.,National Institute of Horticultural and Herbal Science | Joung H.Y.,National Institute of Horticultural and Herbal Science | Goo D.H.,National Institute of Horticultural and Herbal Science | Choi Y.J.,National Institute of Horticultural and Herbal Science | And 6 more authors.
HortTechnology | Year: 2013

This study investigated trends in lily (Lilium hybrids) cultivars and challenges for growing cut lily flowers using a survey of producers in the South Korean lily industry. A questionnaire requested information on various topics including the total growing area, length of farming experience, cultivars grown, factors considered when purchasing bulbs, cultivation systems, horticultural practices, disease and pest problems, and horticultural problems. The survey targeted the membership of the Korea Lily Producer Association and the number of respondents corresponded to 43% of all lily farmers in the country. Oriental-Trumpet (OT) hybrid 'Yelloween' and Oriental hybrids 'Siberia', 'Medusa', and 'Sorbonne' were mainly cultivated in South Korea. The main flower colors were yellow, white, and pink. Factors considered in choosing cultivars were the prices of bulbs and cut flowers affecting income of the farm. More than 90% of respondents used soil culture in a greenhouse to grow cut flowers. There were various horticultural practices used from planting to harvest. The main pests harming bulb and flower productivity were fungus gnat (Bradysia difformis) and bulb mite (Rhizoglyphus robini), and the most common horticultural problem was leaf scorch. Overall, the survey suggested that the stable production of lily bulb with low cost and high quality was required and practical techniques should be developed for increasing the cut lily production efficiency. In addition, the pests, diseases, and horticultural problems in the given local environmental conditions should be considered when breeding new cultivars and developing production technology.

Ko J.-Y.,Horticulture Research Division | Choi K.-J.,Horticulture Research Division | Hong D.-K.,Horticulture Research Division | Noh H.-S.,Horticulture Research Division | And 2 more authors.
Acta Horticulturae | Year: 2011

Summer cut flower production of Lilium oriental hybrids has some problems including short stems, reduced number of flower buds, and shortened inflorescence length. The temperature and length of pre-plant holding before planting bulbs were studied in an effort to improve quality of 'Siberia' oriental hybrid lilies. 'Siberia' bulbs were held at 9, 12 or 15°C, for 9, 14, or 19 days before planting (10 June) in Gangneung (a high land, 600 m a.s.l.). When held at 12°C for 14 days before planting, the length and weight of harvested stems increased and physiological flower bud blindness was reduced by 46% as compared with controls. When 'Siberia' was held at 12°C for 17 days before planting at the other high site (Muju, 400 m a.s.l.) on 20 July, stem length and flower bud length were 90.2 and 12.5 cm, greater than the other treatments and bud blindness was reduced by 35.5% as compared with the control.

Gotame T.P.,University of Aarhus | Gotame T.P.,Horticulture Research Division | Cullen D.W.,James Hutton Institute | Graham J.,James Hutton Institute | And 5 more authors.
Journal of Horticultural Science and Biotechnology | Year: 2014

The effect of high temperature stress (27ºC or 37ºC for 24 h) on total gene expression profiles in the annual-fruiting raspberry (Rubus idaeus L.) cultivars ‘Autumn Bliss’, ‘Autumn Treasure’, ‘Erika’, and ‘Polka’ were evaluated at the floral initiation stage using a customised Rubus microarray. Significantly affected genes were obtained by pairwise ttests using ‘volcano plots’ for each cultivar × treatment. A 10ºC elevation in temperature altered levels of expression, in at least one cultivar, of 644 differentially expressed genes in total, with ‘Erika’ and ‘Autumn Treasure’ showing elevated expression of 38 genes compared to ‘Autumn Bliss’ and ‘Polka’. We identified 12 common candidate genes that were modulated differentially in ‘Autumn Bliss’ and ‘Erika’ at 37ºC compared to 27ºC. In addition, two aquaporin genes (PIP1 and TIP2) were down-regulated in ‘Autumn Bliss’, but up-regulated in ‘Autumn Treasure’, ‘Polka’, and ‘Erika’ at 37ºC. Other down-regulated genes from the list of 38 genes included those encoding major latex-like proteins, plasma membrane proteins, cysteine rich proteins, and other stress-related proteins. Validation by real-time quantitative RT-PCR (RT-qPCR) indicated subtle changes in differential gene expression, suggesting a mild response to heat stress. This study used molecular tools to increase our understanding of, and to identify candidate genes involved in, the heat stress response of four annual-fruiting raspberry cultivars. © 2014 Journal of Horticultural Science & Biotechnology. All rights reserved.

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