✦ LIBER ✦

The transfer of triazine resistance fromBrassica napusL. toB. oleraceaL. III. First backcross to parental species

✍ Scribed by R. Ayotte; P. M. Harney; V. Souza Machado

Publisher: Springer
Year: 1988
Tongue: English
Weight: 357 KB
Volume: 38
Category: Article
ISSN: 0014-2336
DOI: 10.1007/bf00040184

No coin nor oath required. For personal study only.

✦ Synopsis

Atrazine resistant Brassica hapus x B . oleracea F, hybrids were backcrossed to both parental species . The backcrosses to B. napus produced seeds in both directions but results were much better when the F, hybrid was the pollen parent . Backcrosses to B . oleracea failed completely but BC,s were rescued by embryo culture both from a tetraploid hybrid (2n = 4x = 37 ; A,C,CC) and sesquidiploid hybrids (2n = 3x = 28 ; A,C,C) .

Progeny of crosses between the tetraploid hybrid and B . oleracea had between 25 and 28 chromosomes . That of crosses between the sesquidiploid hybrid and B . oleracea had between 21 and 27 . A few plants that had chromosome counts outside the expected range may have originated from either diploid parthenogenesis, unreduced gametes or spontaneous chromosome doubling during in vitro culture . Pollen stainability of the BC,s ranged from 0% to 91 .5% . All the BC,s to B . oleracea were resistant to atrazine .

📜 SIMILAR VOLUMES

The transfer of triazine resistance from

The transfer of triazine resistance fromBrassica napusL. toB. oleraceaL. I. Production of F1hybrids through embryo rescue

✍ R. Ayotte; P. M. Harney; V. Souza Machado 📂 Article 📅 1987 🏛 Springer 🌐 English ⚖ 723 KB

Triazine resistant Brassica napus ssp. oleifera and ssp. rapifera were hybridized to cultivars of B. oleracea ssp. italica, ssp. botrytis, ssp. capitata and ssp.jimbriata. The interspecific embryos did not survive in vivo but could be rescued in vitro using a culture medium developed by MONNIER (19

The transfer of triazine resistance from

The transfer of triazine resistance fromBrassica napusL. toB. oleraceaL. II. Morphology, fertility and cytology of the F1hybrid

✍ R. Ayotte; P. M. Harney; V. Souza Machado 📂 Article 📅 1988 🏛 Springer 🌐 English ⚖ 678 KB

F, hybrids of triazine resistant Brassica napus and triazine susceptible B . oleracea were morphologically intermediate to the parent species . Of 49 hybrids examined, 44 had 28 chromosomes, two had 37, one had 38 and two had 56 . The 38-chromosome plant was thought to be a matromorph, the others, A