Chromosome and genome composition of a Triticum x Thinopyrum hybrid by classical and molecular cytogenetic techniques

MAIA FRADKIN MARÍA ROSA FERRARI VÍCTOR FERREIRA EZEQUIEL MARTÍN GRASSI EDUARDO JOSÉ GREIZERSTEIN LIDIA POGGIO

GENETIC RESOURCES AND CROP EVOLUTION

SPRINGER

Lugar: New York; Año: 2011 vol. 59 p. 231 - 237

0925-9864

Triticum–Thinopyrum amphiploids arose from the need to obtain forage grasses highly resistant to pest, drought, soil salinity and frost and they can be used as efficient bridges to transfer desired genes from wheatgrass species to wheat. One of them is trigopiro SH16 INTA, it was introduced in Argentina in 1947 but its genomic composition was unknown. The aim of this work was to determine the chromosome number and genomic and chromosome composition of trigopiro SH16 INTA in order to use it in breeding programs. The simultaneous use of the in situ hybridization technique with different probes (genomic DNA of Th. ponticum (Podp.) Barkworth et D.R. Dewey, pSc119.2 and pAs1) allowed us to conclude that the chromosome number of trigopiro SH16 is 2n = 42 and the genome composition would be: 14 chromosomes of the B genome, the 2D and 4D chromosome pairs of wheat, 14 chromosomes of the J genome of Thinopyrum and the remaining chromosomes probably belong to the A genome of wheat.