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Endopolyploidy and structures of the nuclei in the endosperm of theCucurbitaceae

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Summary

In the endosperm ofEchinocystis lobata the endopolyploid nuclei show structural changes of chromocentres typical of the process of endomitosis in Angiosperms.

The cytological differentiation of the endosperm proper and the chalazal haustorium in three further representatives of theCucurbitaceae: Sicyos angulata, Cyclanthera pedata andCitrullus colocynthis is also connected with endomitotic polyploidisation. The nuclei of the endosperm proper attain in the different species different levels of polyploidy, 384n, as a maximum. In the nuclei of the chalazal haustorium the degree of polyploidy is lower (as a maximum 24n).

The structure of polyploid nuclei which did not undergo postendomitotic mitoses shows some differences in the species studied in the course of the present work.Sicyos angulata has prochromosomic diploid nuclei, whereas those ofCitrullus colocynthis andCyclanthera pedata can be assigned to chromomeric nuclei with a dense structure. Endopolyploid nuclei of all three species studied are characterized by the occurence of compact chromocentres of different size; besides in some nuclei ofSicyos angulata andCyclanthera pedata the chromocentres within the resting nucleus reveal their chromomere structure. In addition, inCitrullus colocynthis nuclei with numerous thin threads of various degrees of spiralisation have been observed. — In all three species the endopolyploid nuclei after mitotic divisions have notably higher numbers of nucleoli and small chromocentres.

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  1. Kraków

    Krystyna Turała

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  1. Krystyna Turała
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Dedicated to Professor L.Geitler on the occasion of his 70th birthday.

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Turała, K. Endopolyploidy and structures of the nuclei in the endosperm of theCucurbitaceae . Österr bot Z 116, 95–111 (1969). https://doi.org/10.1007/BF01379614

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  • DOI: https://doi.org/10.1007/BF01379614

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