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Lauren C. Garner

introductory pomology class provided a sound pedagogical approach to teach horticultural techniques while also meeting broader university learning objectives, including fostering critical thinking, communication, teamwork, and community involvement. Materials

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Jules Janick

varying success. The present workshop, History of Hawaiian Pomology, sponsored by the History of Horticultural Science and Pomology Working Groups, explored three famous fruit and nut crops of Hawaii: pineapple (oral presentation by Johnny Lopez), papaya

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Gayle M. Volk, James W. Olmstead, Chad E. Finn, and Jules Janick

has had an enormous influence on pomology and horticulture. Trait improvements have been associated with characters that are beneficial to consumers such as the improvement of edible quality and appearance and to growers, packers, and processors such

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Young-Sik Park, Sang-Hyun Lim, and Jae-Yun Heo

In Korea, consumer demand for seedless grapes with high quality and large berries is increasing. Although a lot of effort into introducing European stenospermocarpic grape cultivars in Korea has been made, it did not work because they were not adaptable to growth conditions in Korea. In Korea, most seedless grapes are currently produced by applying plant growth regulators twice, using seeded grape cultivars such as Kyoho and Shine Muscat. Because this method is time-consuming and labor intensive, it is becoming more important to breed and introduce seedless grape cultivars that can reduce labor and time. The characteristics of parthenocarpy, stenospermocarpy,

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Young-Sik Park, Jae-Yun Heo, and Sun-Bai Bang

Vitis amurensis is a member of the family Vitaceae and is found in China, Japan, and Korea (Venuti et al., 2013). Several researchers have reported that it has high disease resistance and freezing tolerance (Jiao et al., 2015; Liu and Li, 2013) and contains many health-promoting compounds such as anthocyanin and resveratrol (He et al., 2015). Therefore, although V. amurensis has received great attention in Korea (Park et al., 2015), it has been mainly used for making processed products because of its generally low fruit quality (

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Young-Sik Park, Je-Chang Lee, Haet-Nim Jeong, Nam-Yong Um, and Jae-Yun Heo

Because of the success of the grape cultivar Shine Muscat in Korea, consumer interest in high-quality seedless grapes has significantly increased (Kim et al., 2021). In Korea, most seedless grapes are currently produced by treating genetically seeded grape cultivars, such as Shine Muscat and Kyoho, with plant growth regulators before and after flowering. Unfortunately, although the method effectively induces production of seedless fruits, the standardization of fruit quality is difficult to achieve because it is not easy to set an optimal treatment time and concentration of the growth regulator. Furthermore, the additional labor required, which accounts for a

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Jae-Yun Heo and Sung-Min Park

Korean markets have recently shown a strong demand for grapes with large-sized seedless fruits (Heo and Park, 2015), and several attempts to introduce world-class seedless grape cultivars, such as Thompson Seedless and Crimson Seedless, have been made. However, they are not adapted to Korea’s climate and are not recommended for commercial planting in Korea. Therefore, seedless grapes have been produced in Korea by applying gibberellins (GA3) to tetraploid seeded grape cultivars such as Kyoho. Producing seedless fruits from seeded grape cultivars generally requires two GA3 applications and cluster thinning treatments before and after blooming

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Young-Sik Park, Je-Chang Lee, Nam-Yong Um, Haet-Nim Jeong, and Jae-Yun Heo

In Korea, ‘Campbell Early’, ‘Shine Muscat’, and ‘Kyoho’ account for more than 90% of the Korean grape cultivation area (Kim et al., 2021). As a result, the supply of grapes in the Korean market is excessive during a certain period. Consequently, it is difficult to avoid a reduction in the wholesale price, and the opportunity for consumers to experience other grape cultivars becomes limited. In the current scenario, in which imports are occurring rapidly following the recent implementation of the free-trade agreement with Chile and the United States, it is necessary to cultivate various high-quality grape cultivars to

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Murat Seker, Kenan Kaynas, Ahmet Yilmaz, and Uygar Us

In this study, we described some tree and fruit characteristics of a novel white nectarine type. The genetic diversity within this white nectarine population was investigated using six enzyme systems and its isozyme variation was also compared with common peach and nectarine cultivars. The results demonstrated that there was a significant variation within the white nectarine population in terms of plant and fruit characteristics probably due to the repropagation of the white nectarines using seedlings by growers. This variation was also verified by isozyme polymorphisms. Plants characteristics of white nectarines were similar to the trees of common peach or nectarine cultivars. However, the white nectarines produce less yield than the common peach or nectarine cultivars and they have small fruit with white-cream color and small flesh ratio making their fruit less attractive. We believe that the white nectarines have high market value and consumer acceptance because of its unique flavor which was confused with taste of either plums or apricots. So far, no standard white nectarine cultivar has been reported. This is the first report characterizing some plant and fruit characteristics of white nectarines which could be used for breeding of standard white nectarine cultivars with high yield and fruit characteristics while keeping its unique flavor. In addition, the white nectarines represent a novel source of germplasm for improvement of peaches and nectarines.

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Santiago Pereira-Lorenzo, Ana M. Ramos-Cabrer, Javier Ascasíbar-Errasti, and Juan Piñeiro-Andión

Spain is the 15th largest apple (Malus ×domestica Borkh.) producer in the world with production depending mainly on foreign cultivars. During the 1970s, a germplasm bank of local cultivars was established in Galicia with the aim of preserving the local resources of northwestern Spain. A total of 408 accessions were studied using 89 morphological characters, with 15 corresponding to phenology, 46 to fruit, 7 to flowers, 11 to leaves, 6 to pests and 4 to diseases. Three variable isoenzymes, PGM E.C., PGI E.C. and EST E.C., were analyzed for 405 accessions and 27 commercial cultivars. The main objectives of this work were 1) to evaluate the inter- and intracultivar variability using morphological characters and isoenzymes, 2) to classify the accessions according to the main sources of variability, and 3) to identify repetitions in the germplasm bank. Principal component analysis (PCA) revealed six main sources of variability in the following order: size of fruit, color of skin, acidity, sweetness, harvest time, and attractiveness. The PCA analysis across 350 accessions produced 42 morphological groups. The 3 isoenzymes produced 190 genotype clusters. Combining morphological classification with the isoenzyme genotypes, we found 31 groups of synonyms involving 82 accessions and 8 more possible groups involving 17 accessions. This result allows the elimination of 53 repetitive accessions from the germplasm bank. Six commercial cultivars were identified as the progenitors of eighteen accessions: `Reineta Blanca' of seven, `Reina de Reinetas' of two, `Reineta de Caux' of eight and `Golden Delicious', `Golden 4187' or `Ozark Gold' of one each. Because inter- and intracultivar variability was high and names given by the growers were not reliable, the suggested selection strategy is to select individual clones among and within cultivars to exploit both the inter- and intracultivar genetic variability.