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- Title
Genetic stability and maintenance of Raphanus sativus lines with an addedBrassica rapa chromosome.
- Authors
Kaneko, Y.; Yano, H.; Bang, S. W.; Matsuzawa, Y.
- Abstract
The genetic stability and maintenance of Raphanus sativus-Brassica rapa monosomic chromosome addition lines (a-h-types MALs, 2n = 19, BC[SUB2]), developed by backcrossing the synthesized amphidiploid Raphanobrassica (Raphanus sativus × Brassica rapa, 2n = 38, RRAA) with R. sativus cv. 'Shogoin' (2n = 18, RR), was investigated. Transmission of the added alien chromosome through selected smaller seeds (SSS) and the inheritance of morphological traits and random amplified polymorphic DNA (RAPD)-specific markers together with meiotic chromosome configuration and seed fertility were also investigated for three successive generations (BC[SUB3] to BC[SUB5]). The distinctive traits and the RAPD-specific markers of the eight types of MAL were substantially inherited and stably maintained throughout three generations, although a few variant plants (2n = 18) resembling MALs (2n = 19) and hyperploidal plants (2n = 26 and 2n = 37) were generated in the earlier generations of BC[SUB3] and BC[SUB4] in comparison with BC[SUB5]. The average transmission rates for three generations ranged from 26% for both the b-type and the d-type to 44% for the e-type through SSS. On the other hand, the transmission rates through randomly selected seeds (RSS) were lower, ranging from 6.5% for the f-type to 23.5% for the b-type. In meiosis, more than 90% of PMCs showed the 9II + 1I pairing configuration at metaphase I throughout three generations. For seed fertility, when backcrossed with the radish cv. 'Shogoin', the values were approximately 180% to 500% with the mode around 300% with the seed harvested from a pod increasing with the advancing generations. Genetic recombination between the radish chromosomes and the added chromosome is probably rare, suggesting that the added chromosome is mostly maintained unaltered in the background of the radish genome.
- Subjects
RADISHES; BRASSICA; CHROMOSOMES; PLANT genetics
- Publication
Plant Breeding, 2003, Vol 122, Issue 3, p239
- ISSN
0179-9541
- Publication type
Article
- DOI
10.1046/j.1439-0523.2003.00849.x