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J. Egea, P. Martínez-Gómez, F. Dicenta, and L. Burgos

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J. Egea, D. Ruiz, F. Dicenta, and L. Burgos

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Sandra M. Reed

The objectives of this study were to evaluate self-fertility and to determine the effectiveness of pollinations made over a 4-day period in Japanese snowbell, S. japonicum Sieb. & Zucc. Pollen germination and pollen tube growth were observed in stained styles following cross- and self-pollinations made from 1 day before to 2 days after anthesis. One month after pollination, fruit set averaged 40% in cross-pollinations and 14% in self-pollinations. Two months later, about one-third of the fruit resulting from cross-pollinations had aborted and only one fruit remained from the self-pollinations. This study demonstrated that stigmas of S. japonicum are receptive for at least 4 days and that flowers should be emasculated prior to making controlled cross-pollinations.

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Dario J. Chavez and Paul M. Lyrene

levels of self-compatibility within the populations of several Vaccinium species and to search for plants with high self-compatibility that could be used in breeding self-compatible southern highbush cultivars. Materials and Methods Self- and cross

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J. Egea, T. Berenguer, J.E. García, and F. Dicenta

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Gabriela Vuletin Selak, Slavko Perica, Smiljana Goreta Ban, Mira Radunic, and Milan Poljak

self-compatibility and reproductive effectiveness of pollen sources (pollenizers) planted in the orchard. Pollination success often varies among years and causes a reduction in fruit set ( Griggs et al., 1975 ; Quero et al., 2002 ). Orchard

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Guanxing Hu, Chao Gao, Xiaoming Fan, Wenfang Gong, and Deyi Yuan

needs to be addressed urgently. Several studies have been conducted on pollination and embryo development ( Liao et al., 2014a ), self-compatibility ( Gao et al., 2015a ), and the pollination effectiveness of various insects for this species ( Wei et al

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Ryan N. Contreras, John M. Ruter, and David A. Knauft

self-compatibility and presence of apomixis in Callicarpa . Dirr (2009) reported that C. dichotoma (Lour.) K. Koch produces fruit consistently every year even when isolated from other seedlings or species, suggesting self-compatibility, but C

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Jung Hyun Kwon, Ji Hae Jun, Eun Young Nam, Kyeong Ho Chung, Ik Koo Yoon, Seok Kyu Yun, and Sung Jong Kim

flowers is also used to determine cross-compatibility ( Beppu et al., 2003 ). The PCR-based S-RNase allele typing has been used widely to determine self-incompatibility among groups. This method allows identification of different S -alleles based on

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Qi Zhang, Enda Yu, and Andy Medina

derived from them were largely created by interspecific crossing, backcrossing, sib-mating, and selfing for better fertility, self-compatibility, and a broader genetic background during the long-continued breeding process. To overcome crossing barriers