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Genetics and Breeding of 42‐Chromosome Triticale. I. Evidence for Substitutional Polyploidy in Secondary Triticale Populations 1
Author(s) -
Gustafson J. Perry,
Qualset C. O.
Publication year - 1974
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1974.0011183x001400020003x
Subject(s) - triticale , biology , secale , ploidy , chromosome , sterility , genetics , hybrid , genome , botany , gene
F 2 plants from two hybrid populations of 42‐chromosome triticale (X Triticosecale Wittmack) were crossed to Triticum aestivum L. em. Thell. cv. ‘INIA 66’ and to diploid rye ( Secale cereale L. cv. ‘Merced’). The numbers of univalent chromosomes in the crosses to INIA 66 or paired chromosomes in the crosses to Merced were determined to estimate the number of rye chromosomes in the F 2 triticale plants. The results indicated that 3 to 6 rye chromosome pairs were present and thus support the hypothesis that D genome chromosomes are present hi some 42‐chromosome triticales. Such triticales can have various combinations of D and R chromosomes in addition to the A and B genomes of, Triticum , and hybrids among these triticales are essentially interspecific crosses with resultant sterility in the F 1 and subsequent generations.