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Unreduced diploid nuclei in Cupressus dupreziana A. Camus pollen

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Abstract 

Size and DNA content of pollen of Cupressus dupreziana A. Camus, a highly endangered Mediterranean conifer, were assessed by cytomorphological observations and flow cytometric analyses and then compared to C. sempervirens L. pollen. Mature C. dupreziana pollen was composed of two uninucleated types of pollen grains differing in size. Around 35% of the grains exhibited a size similar to C. sempervirens pollen, while 65% exhibited a larger diameter. However only one peak of fluorescence was detected by flow cytometry. DNA content of C. dupreziana pollen was twice the DNA content of C. sempervirens pollen. Comparison of DNA contents of mature and germinating pollen revealed that mature pollen of both species were arrested in the G2 phase. Comparison with the DNA content of somatic tissue (2C) provided evidence for the production of unreduced pollen in C. dupreziana. This unexpected feature in gymnosperms is discussed in terms of reproductive strategy of this species.

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Authors and Affiliations

  1. INRA, Unité de Recherches Forestières Méditerranéennes, Equipe de Génétique Av. Vivaldi, 84000 Avignon, France e-mail: pichot@avignon.inra.fr Fax: +33(0)4 90 13 59 59, , , , , , FR

    C. Pichot

  2. Université d’Avignon, Faculté des Sciences, Département de Biologie, 33 rue L. Pasteur, 84000 Avignon, France, , , , , , FR

    M. El Maâtaoui

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  1. C. Pichot
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  2. M. El Maâtaoui
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Received: 11 December 1999 / Accepted: 22 December 1999

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Pichot, C., El Maâtaoui, M. Unreduced diploid nuclei in Cupressus dupreziana A. Camus pollen. Theor Appl Genet 101, 574–579 (2000). https://doi.org/10.1007/s001220051518

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  • DOI: https://doi.org/10.1007/s001220051518

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