2 edition of Meiotic behavior of species and hybrids in the genus Solanum section tuberarium. found in the catalog.
Meiotic behavior of species and hybrids in the genus Solanum section tuberarium.
Raymond Wilbur Buck
Written in English
|LC Classifications||QH605 .B8|
|The Physical Object|
|Number of Pages||39|
|LC Control Number||a 53000130|
The basic chromosome number in the genus is 13, and all species studied have either 13 or 26 pairs of chromosomes. The cytological behavior of all species hybrids, except one, included in this paper has been reported previously by other workers. Further data on the meiotic chromosome behavior of species hybrids and haploids are given. Crop wild relatives (CWRs) are wild taxa with close genetic relationships to species with direct socioeconomic importance. As essential components of natural habitats and agricultural systems, thei.
meiotic chromosome behavior in species, species hybrids, haploids, and induced polyploids of gossypium J. O. Beasley Genetics January 2, vol. 27 no. 1 He earned a Doctor of Philosophy (PhD) degree in , for his thesis, "Species Differentiation, and the Nature of Polyploidy in certain species of the genus Solanum – section Tuberarium." His work presented a new concept of the species relationships within the tuber-bearing Solanum.
To further investigate the extent of hybridisation in the group and for comparative purposes, pollen viability was estimated in (i) artificial hybrids between a commercial cultivar (Calén INTA) of the common potato (tetraploid Solanum tuberosum ssp. tuberosum) and the tetraploid cytotype of the related wild species S. gourlayi, and (ii. Analysis of meiotic chromosome structure and behavior in Robertsonian that this is because a formation of Rb metacentrics with monobrachial homology within different races of the same species might be an initial event for the divergence of chromosomal forms. Djlelati R, Brun B, Rumpler Y. () Meiotic study of hybrids in the genus.
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Meiotic behavior of species and hybrids in the genus Solanum section : Raymond Wilbur Buck. Meiotic behavior of species and hybrids in the genus Solanum section tuberarium By Jr. Raymond Wilbur Buck Topics: Botany, Cellular biologyAuthor: Jr.
Raymond Wilbur Buck. IN the course of a cytogenetic study of the nature of differentiation of diploid species (2n = 24) of the section Tuberarium, genus Solanum, the Cited by: 3.
In autotetraploid Medicago sativa and Solanum tuberosum, inbred polyhaploids (2x progeny from parthenogenetic embryos in 4 x-2 x crosses) frequently exhibit meiotic abnormalities (Yeh et. 1. Instances of the function of unreduced gametes (egg cells and pollen grains) in tuber-bearingSolanum species are given.
Meiosis was studied in the chromosome F 1 plants of the crossS. phureja×S. tuberosum and in the and chromosome F 1 plants of the crossS.
tuberosum×S. chromosome hybrids were sterile and showed several meiotic Cited by: Abstract. Solanum × michoacanum (Bitter.) Rydb. (mch) is a wild diploid (2n = 2x = 24) potato species derived from spontaneous cross of S.
bulbocastanum and S. hybrid is a 1 EBN (endosperm balance number) species and can cross effectively only with other 1 EBN species. Plants of mch are resistant to Phytophthora infestans (Mont) de Bary. There is apparently a correlation between short styles and self-compatibility.
All species are diploid (n = 12) and no chromosomal or meiotic aberrations were noted in the species or hybrids. Most of the more than 1, interspecific crosses failed.
Most of the hybrid fruits bore no. Summary In the series Megistacroloba of the genus Solanum meiosis was regular usually having 12 bivalents at diakinesis and metaphase I in five species and 13 interspecific hybrids.
The one exception was S. toralapanum in which two clones had a high frequency of univalents at diakinesis and metaphase I.
Meiotic chromosome cytology was compared betweenSolanum pennellii, Lycopersicon esculentum, and the F1 hybrid. Pachytene chromosomes are very similar in gross morphology, but several of theS. pennellii chromosomes were found to have somewhat longer chromatic regions with discrete chromomeres, and darkly staining chromomeres in the achromatic regions.
Meiotic behavior of economically important plant species: the relationship between fertility and male sterility. Maria Suely Pagliarini Departamento de Biologia Celular e Genética, Universidade Estadual de Maringá, Maringá, PR, Brasil.
Section Tuberarium of the genus Solanum of North America and Central America. show the first instance of gross meiotic unbalance in species hybrids of tuberousSolanums, and give further.
In view of the pairing behavior in triploid hybrids of both the parental species with certain diploid C O M and T U B species, the above meiotic configurations may be used as evidence to suggest that almost all the paired chromosomes are due to a close homology between the first ones (A and A) of the parental genomes and the relatively high.
Section Tuberarium, Subsection Hyperbasarthrum, Meiotic chromosomes in pollen mother-cells of the hybrids behave in a fashion commensurate with the high reproductive fertility. Theonly deviations detected andother species of Solanum.
Yet, even if such hybrids could be produced, it is. Studies on the Species Differentiation in the Section Tuberarium of Solanum 6: Meiotic behavior of Amphiploids from Solanum longipedi-cellatum x S.
chacoense and its Bearing on Genomic Affinity between the Parent Species(馬鈴薯近縁種における種の分化に関 する研究 (第6報): Solanum longi-pedicellatum x S. IN the course of a cytogenetic study of the nature of differentiation of diploid species (2n = 24) of the section Tuberarium, genus Solanum, the mode of inheritance of three loci could be followed.
Meiosis is a specialized cell division, essential in most reproducing organisms to halve the number of chromosomes, thereby enabling the restoration of ploidy levels during fertilization.
A key step of meiosis is homologous recombination, which promotes homologous pairing and generates crossovers ([CO]s) to connect homologous chromosomes until their separation at anaphase I.
-Section Tuberarium of the Genus Solanum of North America and Central America. of chromosome behavior observed in species and in species hybrids does in fact reflect a true absence of gross. Cytogenetic studies of species and interspecific hybrids of Solanum, section Tuberarium, series Me June American Journal of Potato Research R.
Buck. The possibility to obtain diploid hybrids by pollination of allotetraploid wild potato species Solanum acaule and S. stoloniferum plants with fertile pollen of S. tuberosum dihaploids was demonstrated for the first time.
Dihaploid hybrids have arisen with comparatively high frequency (from to %). This study treats of the number and meiotic behavior of chromo- somes in tuber-bearing forms of Solanum. These forms came originally from widely different sources and belong to the section Tuberarium of the genus Solanum.
Cytological material was col- lected from 2 unnamed seedlings and 38 commercial varieties belong. Meiosis in triploid Solanum tuberosum was studied in plants that originated from crosses between tetraploids and diploids, the latter being mainly dihaploids.
Association of chromosomes in first metaphase was regular, being as expected for autotriploid material. In first anaphase lagging chromosomes occurred that mostly divided precociously into their chromatids, the amount of lagging.Interspecific Hybrids.
The pairing behavior of the two genomes in the gametic set of S. tuberosum can be inferred from hybrids such as the tetraploids obtained from the cross S. tuberosum X diploid species (due either to the functioning of unreduced gametes in the diploid parent or the use of autotetraploids of diploids), and hexaploids derived.Of these hybrids 79% were aneuploid, lacking one or two chromosomes in most cases.
All four hybrids that were studied at mitotic anaphase of root tips showed laggards and bridges, the three aneuploids in a higher frequency than the single euploid.
Hybrid K2HC, which showed the highest percentage of aberrant anaphases, possessed 46 chromosomes.