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Junjun Fan, Wangxiang Zhang, Donglin Zhang, Ting Zhou, Hao Jiang, Guibin Wang, and Fuliang Cao

Flowering crabapple is the broad-sense term for plants from the genus Malus (Rosaceae) that have a small fruit diameter (≤5 cm). They have colorful, attractive blossoms (purple, red, pink, white, etc.) as well as fruits of outstanding ornamental

Open access

Dingmeng Hu, Jingwei Xu, Youji Han, Xingjian Dun, Lihui Wang, and Shengxiang Zhu

≈1200 crabapple varieties, with about 100 commonly supplied in today’s global market. Unfortunately, double-petal varieties of flowering crabapples are relatively scarce ( Fiala, 1994 ). In the past 20 years, only two new double-flower crabapple

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Thomas Ranney* and Thomas Eaker

Information on ploidy levels is extremely valuable for use in plant breeding programs. Fertility, crossability, and heritability of traits are all influenced by ploidy levels. Knowledge of reproductive pathways, including occurrence of apomixes, pseudogamy, and formation of unreduced gametes can also be important information for developing breeding strategies. Although ploidy level can be determined by counting chromosomes, flow cytometry provides a reliable and much faster means for determination of nuclear DNA content and associated ploidy level. Measurement of ploidy levels of seeds (embryo and endosperm) can also provide useful insights into reproductive pathways. The objective of this study was to determine the approximate genome size, estimated ploidy level, and range of reproductive pathways of a diverse collection of flowering crapbapples (Malus spp.). Genome sizes were calculated as nuclear DNA content for unreduced tissue (2C). Results from the taxa included in our survey showed DNA contents ranging from 1.52 to 1.82 for diploids, 2.40 to 2.62 for triploids, and 3.36 to 3.74 pg/2C for tetraploids. Based on these ranges, we identified 43 diploid, 10 triploid, and 4 tetraploid crabapple taxa in this collection. Results from open pollinated seeds and seedlings demonstrated a variety of reproductive pathways including apomixes and unreduced gametes. This research provides information on ploidy levels and reproductive pathways of flowering crabapples and will allow for more systematic and efficient progress in the development of improved cultivars.

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T. Scott Starr and L. F. Thompson

Interveinal chlorosis has been observed on the oldest leaves of several varieties of flowering crabapple (Malus sargentii Rehl). Our objective was to identify the cause of this disorder. Foliage and soil from 20 Sargent crabapple trees growing on 12 different sites were analyzed for possible nutrient deficiencies or excesses. Analyses showed N to be slightly low, Ca high, and Mg low in all leaf samples. Soil analysis showed Ca to be abnormally high at all sites. We concluded that the leaf discoloration was caused by a Mg deficiency due to Ca suppression of the Mg and that the low foliar N might be a contributing factor in the interveinal chlorosis.

Open access

Binjie Xu, Yongxia Chen, Wangxiang Zhang, and Donglin Zhang

recorded in Flowering Crabapples ( Fiala, 1994 ), but fewer than 5% of them are semi-double or double flowers, such as the outstanding ‘Van Eseltine’ (pink doubles), ‘Kelsey’ (red doubles), and ‘Sparkler’ (red–purple semi-doubles). During the past 20

Open access

Hao Jiang, Ting Zhou, Junjun Fan, Donglin Zhang, Long Zhang, Yanyan Sun, and Wangxiang Zhang

Horticulture Limited Company ( http://flowering-crabapple.njfu.edu.cn ). Literature Cited Dirr, M. 2010 Manual of woody landscape plants. 6th ed. Stipes Publishing, Champaign, IL Fan, J.J. Zhang, W.X. Zhang, D.L. Zhou, T. Jiang, H. Wang, G.B. Cao, F.L. 2019

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Ting Zhou, Hao Jiang, Donglin Zhang, Junjun Fan, Long Zhang, Guibin Wang, Wangxiang Zhang, and Fuliang Cao

adaptability, crabapples have been widely cultivated in China’s landscape and gardens, and are popular worldwide. Although nearly 1200 crabapple cultivars are recorded in Fiala’s Flowering Crabapples ( Fiala, 1994 ), less than 5% are semidouble or double

Open access

Ting Zhou, Hao Jiang, Wangxiang Zhang, Donglin Zhang, Junjun Fan, Quanquan Zhang, Guibin Wang, and Fuliang Cao

their worldwide prominence as the focal points of landscapes and gardens. Although nearly 1200 Malus taxa are recorded in Fiala’s Flowering Crabapple ( Fiala, 1994 ), less than 5% are semi-double or double-flowered, such as the outstanding

Open access

Lulu Zhang, Yunfei Mao, Yunyun Wang, Lu Yang, Yijun Yin, Xiang Shen, Canhong Zhang, and Duojiao Zhang

Ornamental crabapples or flowering crabapples of the genus Malus in the Rosaceae family are woody plants from the temperate zone cultivated mainly for their luscious display of flowers in spring as well as attractive fruit in autumn and winter

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Parama Sikdar, Mike Willett, and Mark Mazzola

manchurian crabapple as a pollinizer in apple orchards because of its timing of flowering and fruit set ( Church and Williams, 1983 ; Crassweller et al., 1980 ; Williams and Church, 1983 ). Manchurian crabapple produces large and sharp spurs on its branches