M. Zenkteler

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Wide hybridization is a useful tool in plant breeding, but little is known about its possible range. For the cereals, wheat, barley and rye, this was tested with 15 different species of the Poaceae and Panicoideae. Embryo formation could be obtained with Agropyron repens, Alopecurus agrestis, Dactylis glomerata, Festuca glauca, Hordeum bulbosum, Lolium(More)
Because most of the intergenericGramineae embryos abort before they can be isolated and cultured, our object was to grow ovules at an early stage of embryogenesis. Ovules were at size 1 to 7 mm. The youngest stages represented ovules containing several-celled proembryos; the oldest stage consisted of embryos at the level of differentiation of the organs.(More)
  • M. Zenkteler
  • 2000
Pollen grains of the gymnosperm species Ephedra distachya and Pinus wallichiana germinated abundantly on the in vitro cultured placentae of the angiosperm species Nicotiana tabacum, Melandrium album and Allium moly. Some P. wallichiana pollen tubes entered the micropyles of M. album. Embryological observations of cross-pollinated M. album ovules 2 or 3 d(More)
For the first time, hybrid embryos and plantlets were obtained from in vitro-pollinated whole catkins of Salix viminalis with pollen grains of Populus tremula, P. tomentosa and P. alba. Only hybrid embryos were obtained from cross S. viminalis with P. lasiocarpa. Pollen of poplar species germinated on stigmas of willow and some pollen tubes were observed(More)
Haploidisation is a biotechnological method used to obtain plants with improved traits that are of use to humans. Lettuce (Lactuca sativa L.), a well-known and popular leafy vegetable, is consumed worldwide. Its haploid form would provide a good basis for producing a pure line of plants (doubled haploids) allowing new varieties to be regenerated. The main(More)