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Hybrid lethality in interspecific hybrids between Nicotiana tabacum and N. suaveolens: evidence that the Q chromosome causes hybrid lethality based on Q-chromosome-specific DNA markers

Abstract

Hybrid seedlings from the cross Nicotiana tabacum × N. suaveolens express lethality at 28°C. We carried out a cross between monosomic lines of N. tabacum lacking the Q chromosome and N. suaveolens by test-tube pollination and ovule culture at 28°C. To suppress hybrid lethality, hybrid seedlings obtained were transferred to 36°C immediately after germination and cultured. We determined whether Q-chromosome-specific DNA markers were detected among hybrid seedlings. When hybrid seedlings cultured at 36°C were transferred to 28°C, hybrid seedlings in which Q-chromosome-specific DNA markers were detected expressed hybrid lethality, while hybrid seedlings in which Q-chromosome-specific DNA markers were not detected did not express hybrid lethality. From these results, we concluded that the presence of the Q chromosome of N. tabacum is related to hybrid lethality observed in crosses between N. tabacum and N. suaveolens. This is the first report that clearly demonstrates the relationship between a certain chromosome and hybrid lethality in the genus Nicotiana using chromosome-specific DNA markers. Additionally, we confirmed that the Q chromosome belongs to the S subgenome because Q-chromosome-specific DNA markers were detected only in N. sylvestris.

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Acknowledgments

We thank Dr. G. Kokubugata (Tsukuba Botanical Garden, National Science Museum, Japan) for helpful discussions. This work was partly supported by Grant-in-Aid for Scientific Research (A) no. 13306003 and (C) no. 15580003 from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

Author information Authors and Affiliations
  1. School of Agriculture, Ibaraki University, 300-0393, Ami, Ibaraki, Japan

    T. Tezuka

  2. School of Agriculture, Meiji University, 214-8571, Kawasaki, Kanagawa, Japan

    W. Marubashi

Authors
  1. T. Tezuka
  2. W. Marubashi
Corresponding author

Correspondence to W. Marubashi.

Additional information

Communicated by J. S. Heslop-Harrison

About this article Cite this article

Tezuka, T., Marubashi, W. Hybrid lethality in interspecific hybrids between Nicotiana tabacum and N. suaveolens: evidence that the Q chromosome causes hybrid lethality based on Q-chromosome-specific DNA markers. Theor Appl Genet 112, 1172–1178 (2006). https://doi.org/10.1007/s00122-006-0219-0

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