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Weining Wang, Yanhong He, Zhe Cao and Zhanao Deng

), and/or have improved ornamental values. Induced tetraploids may also show improved disease resistance. For example, tetraploid Glycine tabacina became more resistant to the leaf-rust fungus Phakopsora pachyrhizi ( Burdon and Marshall, 1981 ), and

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Dario J. Chavez and Paul M. Lyrene

Vaccinium L. section Cyanococcus L. includes diploid (2n = 2x = 24), tetraploid (2n = 4x = 48), and hexaploid (2n = 6x = 72) species native to North America ( Camp, 1945 ; Vander Kloet, 1983 , 1988 ). The main cultivated groups are lowbush

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Hirotoshi Tsuda, Hisato Kunitake, Mai Yamasaki, Haruki Komatsu and Katsunori Yoshioka

have successfully produced several hybrids in Vaccinium ( Ballington, 1980 , 2001 ; Darrow and Camp, 1945 ; Lyrene, 2011 ; Rousi, 1963 ), but our previous attempts to cross diploid shashanbo with tetraploid highbush blueberry cultivars have not

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Shujun Zhou, Xin Tan, Liqin Fang, Jia Jian, Ping Xu and Guoliang Yuan

; Zhou et al., 2008a ). Using GISH, we have identified a tetraploid LA cultivar that contains one L-genome and three A-genomes (LAAA) referred to as an “odd-tetraploid.” Undoubtedly, the odd-tetraploid undergoes abnormal meiosis during gamete formation as

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Glendon D. Ascough, Johannes van Staden and John E. Erwin

benefits for horticultural, pharmaceutical, and agricultural improvement of plants. Rhododendron tetraploids induced by oryzalin had larger leaves, flowers, and pollen compared with diploids ( Contreras et al., 2007 ). Similarly, tetraploid watermelons

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Paul M. Lyrene

). Several Vaccinium sections, including Cyanococcus , Oxycoccus , and Myrtillus , include diploid, tetraploid, and hexaploid species. Highbush blueberry cultivars are tetraploid hybrids involving Vaccinium corymbosum and several other species in

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Shujun Zhou, Guixue Zhou and Kehu Li

., 2006 ). Triploid lilies (2 n = 3 x = 36) are also produced by diploid × tetraploid crosses or 2n gametes ( Barba-Gonzalez et al., 2004 , 2005a , 2005b ; Lim et al., 2000 ). Based on their genome composition, triploid lilies with three identical

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Mark K. Ehlenfeldt and Chad E. Finn

are often delicately and pleasantly flavored (Ehlenfeldt, personal observation). Origins G-435 is tetraploid (2 n = 4 x = 48) and predominantly Vaccinium corymbosum L. (highbush) with a mixture of other Vaccinium species germplasm in its

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Shigenori Yaguchi, Masanori Atarashi, Masatoshi Iwai, Shin-ichi Masuzaki, Naoki Yamauchi and Masayoshi Shigyo

colchicine-treated plants, 4) evaluation of ability for generative propagation in 1A disomic addition in tetraploid of A. fistulosum , and 5) observation of several agronomic traits, including the ascorbic acid content of the leaf blade in the progeny of the

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Carlee Steppe, Sandra B. Wilson, Zhanao Deng, Keri Druffel and Gary W. Knox

lantana in Australia also differed dramatically in pollen viability and ploidy level/chromosome number. The weedy form had ≈65% pollen stainability and was a tetraploid with 2 n = 4 x = 48 chromosomes, whereas the garden form had extremely low pollen