Hybridization among Epimedium (Berberidaceae) species native to China |
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Authors: | Maoyin Sheng Qingfu Chen Lingjiao Wang Xingjun Tian |
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Institution: | 1. School of Life Science, Nanjing University, 210093 Nanjing, Jiangsu, China;2. Institute of South China Karst, Guizhou Normal University, 550001 Guiyang, Guizhou, China;3. School of Life Science, Guizhou Normal University, 550001 Guiyang, Guizhou, China;4. School of Vocation and Technology, Guizhou Normal University, 550001 Guiyang, Guizhou, China |
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Abstract: | The hybridization of fourteen plant populations belonging to seven Epimedium species native to China was studied by self-cross, infra-population cross, inter-population cross within species, and interspecific cross. Self-pollination studies on nine populations indicated high incompatibility; capsule-set rates were higher than zero in only three (4.61–6.76%). Interspecific cross-pollinations demonstrated high crossabilities in most cross combination (15.38–92.44% capsule-set rate), and the F1 seeds possessed high germination rates (>20%). The F1 hybrids of three interspecific cross combinations were raised to maturity. The morphology, karyomorphology of somatic cells, and pollen mother cell (PMC) meiosis of these F1 plants revealed that they were all highly fertile (>76.10% in pollen viability), that there were few structural differences in chromosomes among species, and that most PMCs had 6 bivalents at MI. Abnormal chromosomal behaviors occurred in a minority, including chromosome bridges, unequal segregation of chromosome number, lagging chromosomes, and micronuclei. A series of experimental crosses provided strong evidence for an outbreeding system and a weak internal barrier to hybridizations in the taxa studied. |
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Keywords: | Breeding system Interspecific F1 Chromosomes Isolation reproduction Epimedium |
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