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Investigation and documentation of hybridization betweenParkinsonia aculeata andCercidium praecox (Leguminosae:Caesalpinioideae)

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Abstract

Morphometric, cytogenetic, geographical and ecological evidence for hybridization betweenParkinsonia aculeata andCercidium praecox is presented. Morphometric investigation using the character count procedure and cytogenetic observations confirm hybrid status. All diagnostic morphometric characters were intermediate in the hybrid. Both parents (2n = 28) show regular tetrad formation and pollen fertility greater than 94%. Hybrids have a chromosome number of 2n = 28 or 2n = 30, and display meiotic abnormalities including lagging chromosomes and micronucleus formation; less than 21% of hybrid pollen was fertile. Ecological and geographical information suggests that hybridization is occurring at increasing frequency due to the expanding range ofP. aculeata associated with cultivation as an ornamental, coupled with ecological disturbance and weediness, and the cultivation ofC. praecox and hybrids as fodder, ornamental and shade trees. Hybrid fertility and phenological observations, in conjunction with F-weighted principal component analysis, suggest that the progeny of F1 hybrids are established. The hybrid is formally described asP. ×carterae.

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  1. Julie A. Hawkins

    Present address: Department of Botany, University of Reading, Whiteknights, PO Box 221, RG6 6AS, Reading, UK

Authors and Affiliations

  1. Department of Plant Sciences, University of Oxford, South Parks Road, OX1 3RB, Oxford, UK

    Julie A. Hawkins & Colin E. Hughes

  2. Herbario de la Benemerita Universidad Autónomia de Puebla (HUAP), Edif. 76 Unidad de Ciencias C.U., 72590, Puebla Pue., Mexico

    José-Luis R. Contreras Jiménez

  3. Instituto de Biología, Universidad Nacional Autónoma de México, A.P. 70-233, C.P. 04510, Delegación Coyoacán, Mexico D.F., Mexico

    Laura White Olascoaga & Pedro Mercado Ruaro

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Hawkins, J.A., White Olascoaga, L., Hughes, C.E. et al. Investigation and documentation of hybridization betweenParkinsonia aculeata andCercidium praecox (Leguminosae:Caesalpinioideae). Pl Syst Evol 216, 49–68 (1999). https://doi.org/10.1007/BF00985100

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