Alla Anatolyevna Torshilova

Russian Academy of Sciences | RAS · Komarov Botanical Institute

We visualized the Feulgen-stained nuclei and chromosomes of fossilized leaves of Metasequoia occidentalis (syn. M. disticha) from West Siberia dated to 29–33 million years old. There are about 22 metacentric chromosomes in somatic anaphase cells. The karyotype of the fossil plant is similar to the modern species M. glyptostroboides. Metasequoia was...

Cardiocrinum cordatum (Thunb.) Makino var. glehnii (F. Schmidt) Hara (Liliaceae) a rare species is characterized by an underdeveloped embryo during dissemination and by the difficulty of seed germination. The aim of the work was to clarify the type of seed dormancy and optimization of seed reproduction in this species by combining various methods:...

Present paper deals with the development of female gametophyte in Dioscorea caucasica (Dioscoreaceae). It has been established the tetrasporic Drusa-type, while earlier it was reported to be of monosporic Polygonum type. The characteristics of all the stages of embryo sac development up to mature embryo sac formation are described.

This work presents data on the genesis of ovule and seed structures in Dioscorea nipponica Makino and examines morphogenetic correlations in their development.