The majority of homosporous ferns have a chromosome number that is severalfold greater than that of diploid seed plants. These fern species have therefore been generally considered to be of polyploid origin. Enzyme electrophoretic investigations have demonstrated, however, that within fern genera, species having the lowest chromosome numbers (n = 27-52) have the number of isozymes typical of di...

Androgenesis in vitro is a basic method of obtaining haploid plants and DH (doubled haploid) lines major crops such as potato, rapeseed, tomato, pepper, wheat, maize, barley, also many different minor species with lower agricultural impact. Diploid appearing among androgenic regenerants are the effect spontaneous doubling chromosome number cells during an embryo’s early developmental stages val...

For the speech ability assessment of glossectomee patients, dynamic MRT was used in order to obtain real time imaging of articulatory movements. At the present state, the method is best suited for continuous consonants, but it can be used for the evaluation of any speech sound. In this study, preand postoperative consonant articulation of eight patients with cancer of the oral cavity is compere...

Polyploidy, or whole genome duplication, has been an important feature of eukaryotic evolution. This is especially true in flowering plants, where all extant angiosperms have descended from polyploid species. Here we present a broad comparative analysis of the effect of polyploidy on flowering plant diversity. We examine the widely held hypothesis that polyploid flowering plants generate more d...

Paulownia tomentosa is a fast-growing tree species with multiple uses. It is grown worldwide, but is native to China, where it is widely cultivated in saline regions. We previously confirmed that autotetraploid P. tomentosa plants are more stress-tolerant than the diploid plants. However, the molecular mechanism underlying P. tomentosa salinity tolerance has not been fully characterized. Using ...

The major cause of powdery mildew in melons (Cucumis melo L.) is the fungus Sphaerotheca fuliginea. There are several cultivar- and season-specific races of this fungus. In order to control powdery mildew, it is important to introduce resistance to fungal infection into new cultivars during melon breeding. Haploid breeding is a powerful tool for the production of pure lines. In this study, it w...