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- Title
Hybridization of <em>Thinopyrum distichum</em> and <em>Secale cereale</em>.
- Authors
Marais, G. F.; Marais, A. S.; Badenhorst, P. C.
- Abstract
An attempt was made to determine whether the salt tolerance genes of <em>Thinopyrum distichum</em> would be expressed in the presence of the rye genomes and if it would be possible to improve and utilize its hybrid with rye as a salt-tolerant fodder crop. <em>Th. distichum</em> florets were pollinated with diploid and tetraploid rye but hybrids were obtained only with tetraploid rye. The F1 had 28 chromosomes and expressed high levels of salt tolerance. Fertility could not be induced through colchicine treatment but the plants produced some apomictic seeds during the summer months. The F2 had 20-22 chromosomes and retained two complete or near-complete rye genomes. The F2 plants responded better to colchicine treatment, however, the doubled hybrids remained male sterile. In summer, one F2 plant produced many apomictic seeds with chromosome numbers ranging from 14 to 16 (primarily rye chromosomes). The mechanism that caused the preferential loss of <em>Thinopyrum</em> chromosomes in each apomictic cycle remains unknown. The F3 phenotypically resembled rye, had primarily reductional male meioses and produced seemingly functional pollen, but were self-sterile.
- Subjects
RYE; APOMIXIS; ASEXUAL reproduction; HARDINESS of plants; SPECIES hybridization; TOLERATION
- Publication
Plant Breeding, 1998, Vol 117, Issue 2, p107
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1111/j.1439-0523.1998.tb01461.x