Journal ArticleDOI
Ontogeny, genetics, and cytology of Nicotiana hybrids
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NICOTIANA SPECIES-CROSSES Crosses in which the pollen-tubes do not reach the ovary, penetrate the micropyle, and induce parthenocarpy.Abstract:
NICOTIANA SPECIES-CROSSES . . . . . . . . . . . . . 35 1. Crosses in which the pollen-tubes do not reach the ovary 36 2. Crosses in which the pollen-tubes reach the ovary, penetrate the micropyle, and induce parthenocarpy 38 3. Crosses in which the/ertilization occurs, but in which the embryos usually die in a very early stage . . . . 42 4. Crosses in which the seeds germinate, but the plants die in the seedling stage . . . . . . . . . . . . . . 44 5. Crosses/rom which mature hybrids are obtained . . . 45 I I I . T H E S L O W G R O W T H O F T H E H Y B R I D E M B R Y O S A N D T H Eread more
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Late-acting self-incompatibility in angiosperms
TL;DR: An hypothesis for the operation of post-zygotic SI is described whereby maternal resources to developing embryos are terminated if the embryo (and/or endosperm) fall below a threshold level of heterosis.
Journal ArticleDOI
Hybrid necrosis: autoimmunity as a potential gene-flow barrier in plant species
Kirsten Bomblies,Detlef Weigel +1 more
TL;DR: The hypothesis that hybrid necrosis can result from autoimmunity, perhaps as a pleiotropic effect of evolution of genes that are involved in pathogen response is presented.
Journal ArticleDOI
Haploids in flowering plants: origins and exploitation.
TL;DR: The range of techniques available for the isolation or induction of haploids are described and their value in a range of areas are discussed, from fundamental research on mutant isolation and transformation, through to applied aspects of quantitative genetics and plant breeding.
Journal ArticleDOI
Nomenclatural changes and a new sectional classification in Nicotiana (Solanaceae)
TL;DR: A revised outline of the sections of Nicotiana with lists of their component species is presented, along with a generalized distribution and a list of accepted species names.
References
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Book
Wuchsstoff und Wachstum
TL;DR: In this paper, the wachstumsfordernden Stoffes (Wuchsstoff) in der aussersten Spitze einer Avena-Koleoptile wird bewiesen.
Journal ArticleDOI
The experimental formation of heteroploid plants in the genussolanum
TL;DR: The cytology of ha.ploid, dilfloid, triploid and totraploid S.' niffrum, S. niflrum, HETI'~IIOPr, OID 8o[, ,x . .xtf~ts . 1 6 9 A. ']Jim comparat.
Journal ArticleDOI
The soluble specific substance of pneumococcus
TL;DR: Improvements in the methods have resulted in the isolation of the end-products in a form free from nitrogen and of enhanced activity with immune serum, and evidence so far accumulated is believed to favor strongly the view that the polysaccharides isolated are the actual specific substances of Pneumococcus.
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