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Rapid Incorporation of D‐genome Chromosomes into A and/or B Genomes of Hexaploid Triticale
Author(s) -
Kaznan E.,
Lelley T.
Publication year - 1994
Publication title -
plant breeding
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.583
H-Index - 71
eISSN - 1439-0523
pISSN - 0179-9541
DOI - 10.1111/j.1439-0523.1994.tb00710.x
Subject(s) - biology , backcrossing , triticale , selfing , karyotype , hybrid , genetics , chromosome , genome , homologous chromosome , cytogenetics , botany , gene , population , demography , sociology
Two series of progenies were developed from hybrids between octoploid (AABBDDRR) and tetraploid triticale ((AB)(AB)RR). One arose from the successive selfing of the F 1 s, while the second was established after one backcross of the F 1 hybrids with the respective 8 × triticale parent. Altogether, 250 F 3 and BC 1 F 2 lines were developed, of which 112 were karyotyped in the F 4 /F 5 or in BC 1 F 3 /BC 1 F 4 generations using C‐banding and SDS‐PAGE. The 112 lines represented 61 different karyotypes, of which 39 appeared to be stabilized, having pairs of homologous wheat chromosomes only, while 22 karyotypes exhibited 1—3 heterologous pairs. The frequency of karyotypically stabilized lines originating from the series with one backcrossing was much higher (79.5 %) than those derived from the successive selfing of the F 1 hybrids (51.7%). Six lines had the pure hexaploid triticale chromosome constitution. The frequency of disomic substitutions of D genome chromosomes for their homoeologous A and/or B genome chromosomes ranged from one to six per line with an average of 1.7. Except for 3B and 6B all possible D(A/B) substitutions were obtained. Chromosomes ID and 3D substituted for their homoeologues with the highest frequency, while the substitution of chromosome 4D for 4A or for 4B was the least frequent. D(R) substitutions were found in eight lines only. A complete set of 6 x triticale lines was established in which chromosome ID was present in all possible combinations, i.e. single 1D(1A/1B/1R) disomic substitutions as well as disomic ID addition.