Studies on the Trisomics in Barley, II

Tomato Telotrisomics: Origin, Identification, and Use in Linkage Mapping

“…Such individuals have been designated "telosomic trisomics" by Burnham (1962), hereafter abbreviated by us to "telotrisomics" . Telotrisomics have been reported in several species including Zea mays (Rhoades 1936), Datura stramonium (Blakeslee and Avery 1938), Nicotiana sylvestris (Goodspeed and Avery 1939), Triticum monococcum (Moseman and Smith 1954), Hordeum vulgare (Tsuchiya 1960), and Secale cereale (Kamanoi and Jenkins 1962). Rhoades (1936) employed a telotrisomic of the short arm of chromosome 5 in maize for finding the arm location of several markers of the linkage group on this chromosome.…”

Cytomorphological behaviour and origin of unusual chromosomal variants in pearl millet (Pennisetum americanum (L.) K. Schum).

“…The tolerance of only two to four chromosomes have been reported in sugar beet (Levan 1942), sorghum (Price and Ross 1957), barley (Tsuchiya 1960) and pearl millet (Gill and Virmani, 1971;Sai Kumar et al 1981, 1982. The occurrence of a high frequency of PMCs (40%) with 5II+1III+1IV or with 2I+4II+1III+1IV at diakinesis/MI in 17-chromosome variant indicates that this plant is tetra-trisomic in nature viz., tetrasomic for one member and trisomic for another member of set.…”

Tools and methodologies for cytogenetic studies of plant chromosomes

“…In most of the plant species, however, at least a few of the chro mosomes and trisomics could be identified in stan dard somatic karyotypes. For example, in barley (Tsuchiya, 1960) and Petunia axiillaris (Reddi and Padmaja, 1982), three of the chromosome pairs and trisomics could be identified using standard procedures. In beets (Romagosa et al, 1986) eight of nine chromosomes and trisomics could be iden tified in the standard fashion and in A. strigosa, Rajhathy (1975) was able to distinguish all chro mosomes and identify all trisomics from standard somatic karyotypes.…”

“…These stocks have also been used for a num ber of studies; from assigning some of the original molecular markers to individual chromosomes in the construction of the first molecular marker maps (Anderson et al, 1992) and to assigning ESTs to physical positions on chromosome arms . The trisomic series in barley and the ditelo series in barley (Tsuchiya, 1960, Fedak et al, 1971 and trisomic series in T. monococ cum (Friebe et al, 1990) and rye (Kamanoi and Jenkins, 1962) have also been used for physical marker mapping. Another aid in wheat cytogenet ics was the publication of a standard karyotype and nomenclature system for hexaploid wheat (Gill et al, 1995).…”