The creation of tetraploid beets
SummaryIn recent years trial fields were laid out with tetraploid families of the sugar beet varieties SX and SY, the fodder sugar beet varieties VA and VB and the fodder beet varieties VC (high content) and VD (low content).It appeared that the tetraploid beets are morphologically distinct from the diploid commercial varieties in leaf form, leaf development, form of the beet, tendency to bolt, size of the clusters and the number of seedlings per cluster.The beets of all the plots are washed, weighed and measured for dry matter, sugar and crude protein content and seed for stecklings is sown on a separate trial field.From the results it appears that there is a variation in the above-mentioned contents so that it seems possible to improve the material by selection. This also holds for the dry matter production which agrees with that of diploid commercial varieties.The investigations are being continued.
The creation of tetraploid beets. V.
SummaryThe tetraploid C2 material obtained at the S.V.P. was sown in a trial field and from the results obtained only the best sugar and fodder beet families were used for further breeding work.Furthermore beets from this material were destined for crossings with tetraploid varieties and also with diploid material.The C2 material should be kept pure by cytological examination.Impurity may be caused by monoploid pollen, by the occurrence of disturbances during meiosis or by technical errors.
Colchicininduzierte Polyploidie beiBeta vulgaris L.
2. WA6NER, S.: Topinambur als Ersatz ftir Zuckerrtiben. Zfichter I, I9o--I93 (1929). 3. WAGNER, S.: Artkreuzungen in der Gattung Helianthus. Z. Abstammgslehre 6I, 76--146 (I932). 4V~ETTST~EIN-'~u W . V., ll. A. ~/[EYL]E : Topinambur als Futterpflanze. Ziichter 4, 66--7o (1932). 5. W E T T S T E I N W E S T E R H E I M , W . v . : Uber d i e Ztichtung von Helianthus tuberosus (Topinambur). Zfichter IO, 9 I 4 (I938).