title: Disomic Thinopyrum intermedium addition lines in wheat with barley yellow dwarf virus resistance and with rust resistances.
abstract: Zhong 5 is a partial amphiploid (2n = 56) between Triticum aestivum (2n = 42) and Thinopyrum intermedium (2n = 42) carrying all the chromosomes of wheat and seven pairs of chromosomes from Th. intermedium. Following further backcrossing to wheat, six independent stable 2n = 44 lines were obtained representing 4 disomic chromosome addition lines. One chromosome confers barley yellow dwarf virus (BYDV) resistance, whereas two other chromosomes carry leaf and stem rust resistance; one of the latter also confers stripe rust resistance. Using RFLP and isozyme markers we have shown that the extra chromosome in the Zhong 5-derived BYDV resistant disomic addition lines (Z1, Z2, or Z6) belongs to the homoeologous group 2. It therefore carries a different locus to the BYDV resistant group 7 addition, L1, described previously. The leaf, stem, and stripe rust resistant line (Z4) carries an added group 7 chromosome. The line Z3 has neither BYDV nor rust resistance, is not a group 2 or group 7 addition, and is probably a group 1 addition. The line Z5 is leaf and stem rust resistant, is not stripe rust resistant, and its homoeology remains unknown.
authors.forename: P J
authors.initials: PJ
authors.lastname: Larkin
authors.forename: P M
authors.initials: PM
authors.lastname: Banks
authors.forename: E S
authors.initials: ES
authors.lastname: Lagudah
authors.forename: R
authors.initials: R
authors.lastname: Appels
authors.forename: C
authors.initials: C
authors.lastname: Xiao
authors.forename: X
authors.initials: X
authors.lastname: Zhiyong
authors.forename: H W
authors.initials: HW
authors.lastname: Ohm
authors.forename: R A
authors.initials: RA
authors.lastname: McIntosh