Interspecific hybridizations with an African tobacco, Nicotiana africana Merxm
Interspecific hybridizations with an African tobacco, Nicotiana africana Merxm
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与非洲烟草（Nicotiana africana Merxm）的种间杂交
DOI：
10.1093/oxfordjournals.jhered.a109270
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发表时间：
1979
影响因子：
3.1
通讯作者：
L. G. Burk
中科院分区：
文献类型：
--
作者：
D. Gerstel;J. Burns;L. G. Burk
最近在非洲发现的一个物种，N. africanaMerxm.，作为雄性与该属的 27 个其他物种杂交。几乎所有杂交都获得了可发芽的种子，但大多数幼苗都死亡了。然而，与来自南太平洋的香猪笼草杂交，产生了活力十足的杂种。细胞学和生化证据表明 N.N. 之间存在一定的分类学亲和力。非洲和N.香，但如何仍然令人费解。 africana 或其祖先到达了非洲。正常型和 23 种单体类型的唇形猪笼草与 N. labacum 的杂交。非洲产生了非常罕见的具有不同染色体数目的杂交体以及一些母本单倍体。相反，当通过N授粉时，单体-H。非洲很容易杂交；所分析的杂交体缺少一条染色体，大概是 H。因此，H 染色体的缺失极大地促进了杂交体的生存，尽管证据尚不清楚拥有完整的 H 是否完全阻止杂交体的生存。 N 中的染色体配对。烟草 x N. africanahybrids 属于“低变量”类型。
A recently discovered species from Africa,N. africanaMerxm., was crossed as the male to 27 other species of the genus. Germinable seeds were obtained from nearly all crosses, but most seedlings died. Crosses withN.fragransfrom the South Pacific, however, produced vigorous hybrids. Cytological and biochemical evidence sug gest some taxonomic affinity betweenN. africanandN. fragrans, but it remains puzzling howN. africana, or its ancestor(s), reached Africa. Crosses of normal and 23 monosomic types of N. labacum withN. africanaproduced very rare hybrids with various chromosome numbers and also some maternal haploids. In contrast, mono somic-H, when pollinated byN. africanahybridized readily; the hybrids analyzed lacked one chromosome, presumably the H. Thus, absence of an H chromosome greatly facilitates the survival of hybrids, though it is not clear from the evidence whether possession of an intact H completely prevents hybrid survival. Chromosome pairing inN. tabacum x N. africanahybrids was of the “low variable” type.