Production of Homozygous Red Beet (Beta vulgaris L. subsp. vulgaris) Plants by Ovule Culture.

Hybrid varieties dominate the red beet market. The breeding process necessary to produce these cultivars is very difficult and time consuming. The application of in vitro gynogenesis can reduce the time needed to produce the corresponding homozygous pure lines to a few months.

Pomological Characteristics and Ploidy Levels of Japanese Plum ( Lindl.) Cultivars Preserved in Poland.

Research on the resistance to frost, susceptibility to sharka, flowering biology, fruit setting, yield, and ploidy levels of 36 Japanese plum cultivars (mostly hybrids of with ) were carried out in 2015-2020 at the Experimental Orchard located in Dąbrowice near Skierniewice. Relatively mild winters with sporadic temperature drops to nearly -21 °C in January of 2017 and 2018 caused slight damage to several cultivars of Japanese plum insufficiently resistant to frost. The trees of most cultivars remained healthy, with no signs of damage.

Apple Autotetraploids with Enhanced Resistance to Apple Scab () Due to Genome Duplication-Phenotypic and Genetic Evaluation.

Among the fungal diseases of apple trees, serious yield losses are due to an apple scab caused by . Protection against this disease is based mainly on chemical treatments, which are currently very limited. Therefore, it is extremely important to introduce cultivars with reduced susceptibility to this pathogen.

Micropropagation of tulip: production of virus-free stock plants.

We describe here a new tulip micropropagation method based on the cyclic shoot multiplication in presence of the thidiazuron (TDZ), which enables the production of virus-free stock plants, speeds up breeding, and provides new genotypes for the market. In our novel protocol, cyclic shoot multiplication can be performed for 2-3 years by using TDZ instead of other cytokinins, as 6-benzylaminopurine (BAP) and N(6)-(-isopentyl)adenine (2iP). It makes possible to produce 500-2,000 microbulbs from one healthy plant.