The anther, pollen and ovule development in Achillea tenuifolia were studied with a bright field microscopy. Results showed that the anther is of tetrasporangiate type and the anther wall is composed by four layers: an epidermis, an endothecium, one middle layer and a tapetum layer. Tapetum is of secretory type and its cells showed polyploidy. Pollen tetrads were tetrahedral, microspores were v...

The great economic importance of sugar beet determines the ongoing biotechnological studies conducted worldwide to improve technology obtaining doubled haploids (DHs) using method unpollinated ovule culture in vitro. To induction gynogenesis, we tested effect thidiazuron (TDZ), temperature bud pretreatment, different concentrations sucrose, and culturing on liquid or solid medium. Three genotyp...

A new species was synthesized artificially by chromosome doubling of an interspecific hybrid between cassava and Manihot anomala. The ensuing polyploid type exhibits an apomictic nature and maintains its morphological characteristics in the progeny. It showed a 29% frequency of multiembryonic sacs in its examined ovules whereas the multiembryonic sacs were absent in the diploid type.

The seed yield in pea (Pisum sativum L.) depends on numerous environmental and genotypic factors. ongoing climate changes draw one’s attention to genetics variation of underexplored reproductive traits. This study focuses ovule number (ON) flower size expressed as a length flag petal (FL), terms their heritability, variability, correlation with 1000 mass (TSM), per pod, seed/ovule ratio. A set ...

The highly elongated single-celled cotton fibre consists of lint and fuzz, similar to the Arabidopsis trichome. Endoreduplication is an important determinant in Arabidopsis trichome initiation and morphogenesis. Fibre development is also controlled by functional homologues of Arabidopsis trichome patterning genes, although fibre cells do not have a branched shape like trichomes. The identificat...