Cytogenetic studies in Nicotialea XVIII. Reduction divisions in three interspecific hybrids between autotetraploid N. tabacum and three other species

Takenaka, Yo

doi:10.1270/jsbbs1951.12.275

Cited by 1 publication

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“…Substantial variation for the bivalent number is a common phenomenon among F 1 hybrids in Nicotiana. The reason is the formation of loosely paired associations (either true bivalents or not) by chromosomes with a low degree of homology (Goodspeed 1954;Takenaka 1962). Some of these associations are broken by premature disjunction.…”

Section: Discussionmentioning

confidence: 99%

“…The failure of the restitution microspores (nuclei) in the N. wuttkei 9 N. tabacum hybrids to develop into viable pollen could be a result of structural differences between the chromosomes resulting in gene imbalance. Other F 1 hybrids of N. tabacum with the members of the section Suaveolentes even if capable of producing partially fertile pollen were generally self-and cross-sterile (Kostoff 1943;Goodspeed 1954;Takenaka 1962;Wark 1970;Ternovski et al 1974;De Verna et al 1987;Doroszewska and Berbeć 1996).…”

Section: Discussionmentioning

confidence: 99%

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Production and characterization of amphihaploid hybrids between Nicotiana wuttkei Clarkson et Symon and N. tabacum L

Laskowska

Berbeć

2011

Euphytica

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Nicotiana wuttkei Clarkson and Symon discovered in the 1990s in Australia may be of potential interest to breeders as it carries resistance to Peronospora hyoscyami de Bary. The crossability between N. wuttkei (2n = 4x = 32) and three N. tabacum (2n = 4x = 48) cultivars ('Puławski 66', 'Wiślica' and 'TN 90') and the morphology and cytology of their amphihaploid hybrids (2n = 4x = 40) were studied. Seeds were produced only when N. wuttkei was used as the maternal parent, but under normal germination all seedlings died. Viable F 1 hybrids of N. wuttkei 9 N. tabacum cv. 'Puławski' and N. wuttkei 9 N. tabacum cv. 'Wiślica' were obtained only by in vitro cotyledon culture. The amphihaploid plants were intermediate between the parents for most morphological traits. In 46.4% of the PMC's, only univalents were present. The remainder of the cells had 1-5 bivalents and 1-2 trivalents. In spite of a detectable frequency of monads (2.6%), dyads (2.6%) and triads (4.5%), the hybrids were self and cross sterile.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%