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Genomic factors controlling the lethality exhibited in the hybrid between Nicotiana suaveolens Lehm. and N. tabacum L.

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Abstract

Interspecific hybrid plants between Nicotiana suaveolens and N. tabacum exhibit lethal symptoms at the seedling stage and cannot grow to maturity. In this investigation, an attempt was made to clarify the genomic factors responsible for this lethality. N. suaveolens was crossed to N. sylvestris (genomic constitution: SS) and N. tomentosiformis (TT), these latter two species being the progenitors of N. tabacum (SSTT). From the cross N. suaveolens x N. tomentosiformis, many seedlings were obtained through ovule culture, and these subsequently grew to maturity without exhibiting any lethality. In the reciprocal crossing between N. sauvelons and N. sylvestris, only a few hybrid seedlings were obtained through ovlue culture and all died after unfolding their cotyledons when cultured at 28 °C. This lethality could be avoided by culturing the ovules at 36 °C. These features of hybrid lethality resembled those observed in the interspecific hybrid between N. suaveolens and N. tabacum. These findings suggest that the S genome in N. tabacum is responsible for the lethality exhibited in the hybrid between N. suaveolens and N. tabacum.

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Authors and Affiliations

  1. Laboratory of Plant Breeding, School of Agriculture, Ibaraki University, Ami-machi, 300-03, Ibaraki-ken, Japan

    E. Inoue, W. Marubashi & M. Niwa

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  1. E. Inoue
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  2. W. Marubashi
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  3. M. Niwa
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Communicated by K. Tsunewaki

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Inoue, E., Marubashi, W. & Niwa, M. Genomic factors controlling the lethality exhibited in the hybrid between Nicotiana suaveolens Lehm. and N. tabacum L.. Theoret. Appl. Genetics 93, 341–347 (1996). https://doi.org/10.1007/BF00223174

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  • DOI: https://doi.org/10.1007/BF00223174

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