The cytology of haploid plants ofSolanum demissum

  title={The cytology of haploid plants ofSolanum demissum},
  author={H. W. Howard and M. S. Swaminathan},
Haploid plants of Solanum demissum Lindl. have been reported by BAINS and HOWARD (1950) and DODDS (1950) to occur frequently in crosses of S. demissum female • diploid species such as S. rybinii, S. stenotomum and S. torlapanum. At first metaphase of meiosis in these haploid plants BAINS and HOWARD (1950) found a mean frequency of 4.74 bivalents per. cell (19 cells), DODDS (1950) 5.6 bivalents (9 cqls) and BAINS (1951) 0.03 trivalents, 5.23 bivalents and 25.44 unh alents (107 cells). This low… 

Genetic transmission of Solanum demissum (2n = 6x = 72) chromosomes from a pentaploid hybrid of S. tuberosum (2n = 4x = 48) into the aneuploid BC1 progeny

The S. demissum genome map will be useful in analyzing intra-locus interaction of qualitative and quantitative traits among homoeologous chromosomes and analyzing allelic variation of homeolog expression.

Cytogenetic studies in tuberousSolanum species I. Genomic differentiation in the group demissa

A tentative scheme has been drawn up giving the genomic constitution of the hexaploids, supported by the observations on polyhaploid S. demissum, and their possible origin discussed.

The number of independent layers at the stem apex in potatoes

Cuttings from colchicine-treated cuttings of the triploid cultivated potato were investigated, suggesting that in potatoes the growing points of axillary buds trace back to two layers only, LI and LII, of the main stem and that stratified layers internal to LII in the axillary bud are derived from LII and not from LIII of themain stem.

Complete Switchgrass Genetic Maps Reveal Subgenome Collinearity, Preferential Pairing and Multilocus Interactions

Switchgrass linkage maps were constructed using a full-sib population of 238 plants and SSR and STS markers to access the degree of preferential pairing and the structure of the tetraploid genome and as a step toward identification of loci underlying biomass feedstock quality and yield.

Einige Untersuchungen über haploide Pflanzen vonSolanum tuberosum

Arbeiten, Ergebnisse und Probleme, die mit den haploiden Formen des S. tuberosum in engem Zusammenhang stehen, ausftihrlich besprochen werden.

The production of hexaploid Solanum x juzepczukii

The “colchicine-grafting” method of doubling the chromosome number of potato cuttings was used successfully for producing hexaploids from the triploid “species”, Solanum x juzepczukii. All the plants

Doubling the chromosome number of selectedSolanum genotypes

A new technique for doubling the chromosome number of potato clones was used to treat 54 diploid (2n−24) genotypes selected for desirable tuber characteristics and yield and appears to be the most efficient method of clonal doubling reported thus far.



Haploid Plants of Solanum demissum

It is shown that, in the hybrid S. demissum × S. Rybinii and in the triple hybrid, “chromosome differentiation between these related species is not sufficient to affect pairing to any extent”, which presumably means that, at least in the double hybrid, about twenty-four bivalents are formed at meiosis.

The aceto-carmine method for fruit material.

It is not easy to make good aceto-carmine preparations of plants with small chromosomes at meiosis because the cytoplasm readily takes up the stain and this prevents a sharp differentiation. The

Cytogenetic studies on Solanum tuberosum L. and some of its relatives

A large number of the questioned people believe that human evolution owes more to natural selection than to man-made factors, and believe that humans should be responsible for one another's evolution.

Cytogenetical studies in the genus Solanurn sect

  • 1951

A haploid plant of S. tuberosum L

  • C.R. (Doklady) Acad. Sci. U.S.S.R.,
  • 1939

Polyhaploids of Solanum demissum

Solanum demissum Lindl. (2n = 72) has been used at the Commonwealth Potato Collection as the maternal parent in various crosses with cultivated and wild diploid species (2n = 24) of Solanum. The

Cytological behaviour of some inter-specific hybrids in the genus Solanum, sect. Tuberarium

It is suggested that the available evidence is not sufficient to warrant the assumption that the basic number of tuber-bearingSolanum species is 6, and the possible modes of pairing in these hybrids are discussed with special reference to the basic chromosome number in the genus.

Species differentiation in the section Tuberarium of Solanum with particular reference to the use of interspecific hybridisation in breeding

It appears that species which cannot be crossed directly with S. tuberosum may not have genoms very different from those found in that species, and the importance of all these studies to problems of potato breeding involving interspecific hybridisation are considered.

A study of meiosis in the microsporocytes of lnterspecific hybrids of Solanum demissum and Solanum tuberosum carried through four backerosses

  • J. Agrie. Res
  • 1948

Potato grafting experiments . I . Tile effect of graft ing scions of Epicure on the shortday species S

  • demissum J . Genet .
  • 1949