Methods of producing F1 hybrid swedes (Brassica napus ssp. rapifera)

Gowers, S.

doi:10.1007/bf00028228

Cited by 26 publications

(17 citation statements)

References 8 publications

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“…For SI hybrid seed production (Gowers 1974(Gowers , 1975(Gowers , 1982(Gowers , 1989Thompson 1983;Banks and Beversdorf 1994), pollen must be transferred from self-compatible to self-incompatible parental lines. For commercial seed production fields that use a modified single-cross dominant SI breeding system, insect pollinators ensure efficient and uniform crosspollination.…”

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confidence: 99%

Nectar quality in open-pollinated, pol CMS hybrid, and dominant SI hybrid oilseed summer rape

Pernal¹,

Currie²

1998

Can. J. Plant Sci.

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. Nectar quality in open-pollinated, pol CMS hybrid, and dominant SI hybrid oilseed summer rape. Can. J. Plant Sci. 78: 79-89. Nectar sugar composition and temporal patterns of nectar sugar production were examined in oilseed summer rape (Brassica napus L. ssp. oleifera (Metzg.)) from six open-pollinated, eight pol cytoplasmic male-sterile (CMS) hybrid and seven dominant self-incompatible (SI) hybrid cultivars at three field plot sites in Manitoba. The total sugar content of nectar samples was measured by the Dreywood anthrone reaction for total carbohydrate, and simple sugar composition was determined using an enzymatic bioanalysis for D-glucose, D-fructose and sucrose. Hybrid and open-pollinated cultivar flowers had similar sugar content. Mean total sugar content per flower also did not vary among hybrid breeding systems when compared within individual weeks of the bloom period or within daily sampling periods. However, for all cultivars, total nectar sugar content per flower was lower during the 08:00 and 11:00 h sampling periods and increased to maximum levels during the 14:00 and 16:00 h sampling periods. Significant differences in nectar sugar content were also found in relation to the bloom phenology of the cultivars. Cultivars produced the greatest amount of sugar per flower during the first 2 wk of the bloom period, then sugar production decreased in the third and fourth weeks. Nectar sugar ratios from all cultivars averaged approximately 1:1 glucose:fructose. Nectar glucose content among cultivars was similar but, among breeding systems, CMS cultivars tended to have lower amounts of glucose than SI or open-pollinated cultivars. Selecting for higher total sugar content may produce nectars more attractive to foraging honeybees (Apis mellifera L.), thereby ensuring adequate pollination of hybrid parental lines and F 1 hybrid plants. Selecting for lower nectar glucose will produce honeys with more desirable granulation characteristics. Overall, the production and quality of nectar sugar in oilseed rape hybrids are similar to those of open-pollinated cultivars, and are not likely to adversely affect the pollinating activities of honeybees or their potential for honey production. spp. oleifera (Metzg.)) de six cultivars de fécondation libre, huit hybrides pol de stérilité mâle cytoplasmique (SMC), et sept hybrides dominants auto-incompatibles (AI) dans trois sites de terrains au Manitoba. Le contenu total de sucre des échantillons de nectar a été mesuré par la réaction anthrone Dreywood pour hydrate de carbone complet, et la composition de sucre simple a été déterminée en utilisant une analyse biologique enzymatique pour D-glucose, D-fructose et saccharose. Les fleurs hybrides ainsi que les fleurs cultivales de fécondation libre avaient un contenu de sucre semblable. Aussi, la moyenne de contenu total de sucre par fleur n'a pas varié parmi les systèmes de reproduction hybrides lorsque comparée à l'intérieur de la limite des semaines individuelles de la période de floraison ou à l'intérieur des périodes d'éch...

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confidence: 99%

Nectar quality in open-pollinated, pol CMS hybrid, and dominant SI hybrid oilseed summer rape

Pernal¹,

Currie²

1998

Can. J. Plant Sci.

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“…Self-incompatibility can be of considerable use in 159 B. napus for the production of hybrid cultivars, but dominant S-alleles are necessary to overcome the SC factors in the natural species (Gowers, 1975). Natural B. napus is generally considered to be SC, despite the presence of two SI loci derived from its diploid progenitor species (Mackay, 1977).…”

Section: Discussionmentioning

confidence: 99%

Expression of self-incompatibility and fertility of Brassica napus L. resynthesized by interspecific somatic hybridization

Ozminkowski

Jourdan

1992

Euphytica

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Brassica napus is a natural allotetraploid derived from the diploid species B. rapa L. (syn. campestr& L.) and B. oleracea L. Somatic hybrids synthesized from highly heterozygous lines of these two diploid species were evaluated for fertility The hybrids were obtained from two fusion experiments which differed in the B. rapa full-sibling parent used as the source of protoplasts. Both B. rapa siblings were self-incompatible (SI) yet contained different S-alleles; the B. oleracea species parent was self-compatible (SC). Eight tetraploid hybrids examined had very high female and male fertility; eight hybrids with higher ploidy had low fertility Hybrids derived from one B. rapa sibling were self-incompatible, whereas those derived from the other B. rapa sibling were fully self-compatible. These data suggest that the different S-alleles of each B. rapa sibling displayed varying penetrance relative to the SC of the B. oleracea parent when combined in B. napus.

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“…Especially in comparison to vegetable hybrids, production systems that produce lower proportions of hybrids would be feasible. A combination of SI and self-compatible sister lines to produce a double-cross hybrid was suggested as the most practicable method (Gowers, 1975). With a multiplication factor of ×1,000, two multiplications will produce 1 tonne of hybrid seed from 1 g of inbred seed.…”

Section: F 1 Hybrid Breedingmentioning

confidence: 99%

Swedes and Turnips

Gowers

2010

Root and Tuber Crops

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Methods of producing F1 hybrid swedes (Brassica napus ssp. rapifera)

Cited by 26 publications

References 8 publications

Nectar quality in open-pollinated, pol CMS hybrid, and dominant SI hybrid oilseed summer rape

Nectar quality in open-pollinated, pol CMS hybrid, and dominant SI hybrid oilseed summer rape

Expression of self-incompatibility and fertility of Brassica napus L. resynthesized by interspecific somatic hybridization

Swedes and Turnips

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