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Evidence for the existence of 2n gametes in Lotus tenuis Wald. et Kit. (2n=2x=12): their relevance in evolution and breeding of Lotus corniculatus L. (2n=4x=24)

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Summary

Crosses between male sterile L. corniculatus (2n=4x=24) and L. tenuis (2n=2x=12) plants were performed in order to verify the presence of 2n gametes in L. tenuis. All but one of the plants from these crosses had 2n=4x=24 and the L. corniculatus phenotype; this plant had 2n=2x=12 and the L. tenuis phenotype. The plants also showed good quantity of pollen at tripping, good pollen fertility and good percentage of seed setting in the backcross to L. corniculatus. On the whole, both cytological and morphological observations, showing that all but one of the plants from L. corniculatus x L. tenuis were normal tetraploids, suggest the existence of diploandrous gametes in L. tenuis. On the other hand, haploid parthenogenesis probably gave origin to the dihaploid plant 2n=2x=12.

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Authors and Affiliations

  1. Istituto di Miglioramento Genetico e Produzione delle Sementi, Università degli Studi, Torino, Italy

    V. Negri

  2. Istituto di Agronomia Generale e Coltivazioni Erbacee, Università degli Studi, Sassari, Italy

    F. Veronesi

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  1. V. Negri
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  2. F. Veronesi
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Communicated by Hu Han

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Negri, V., Veronesi, F. Evidence for the existence of 2n gametes in Lotus tenuis Wald. et Kit. (2n=2x=12): their relevance in evolution and breeding of Lotus corniculatus L. (2n=4x=24). Theoret. Appl. Genetics 78, 400–404 (1989). https://doi.org/10.1007/BF00265303

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  • DOI: https://doi.org/10.1007/BF00265303

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