Cell recognition plays a key role in biology: cells of the immune system can identify foreign invaders, targeted cell migrations are essential for animal development, and gametes bind in a species-specific manner. Here we characterized the nature of cell recognition at the earliest stage of Arabidopsis reproduction, namely the binding of pollen grains to female stigma cells. This interaction oc...

Alyssum strigosum Banks & Sol. subsp. and A. cedrorum (Schott Kotschy) Dudley, which are two subspecies of with their morphological, anatomical, palynological traits, were presented in detail this study. The anatomical analysis has been carried out using handmade sections. transverse sections roots showed that have similar characters as primer structure. stem reflected the typical dicotyled...

The success of sexual plant reproduction is directly influenced by specific interactions between the pollen and pistil. Light, fluorescence and scanning electron microscopy techniques were used to evaluate the steps of pollination in sour passion fruit plants (Passiflora edulis Sims). In the compatible interaction, pollen tubes grow through stigma projections towards the ovary. The pollen grain...

is discharged from the anther as a dusty material and carried by either wind or insects to a plant ovary which is fertilised to generate a seed. Spores are the equivalent element in non-flowering plants such as mosses, ferns or fungi. Both spores and pollen grains are encased within a robust double-layered wall (a section of which is shown in Figure 1) which protects the fragile genetic materia...

The aim of this work was to carry out the reproductive studies on Brazilian accessions of ipecac, Psychotria ipecacuanha. It presented heterostyly, with brevistylous and longistylous flowers. The pollen development was observed from the sections of the anthers embedded in resin. Anther development was normal as usually observed in dicotyledones, displaying four layers: outer epidermis, endothec...

This work contributes to unraveling the role of the phosphorylated pathway of serine (Ser) biosynthesis in Arabidopsis (Arabidopsis thaliana) by functionally characterizing genes coding for the first enzyme of this pathway, 3-phosphoglycerate dehydrogenase (PGDH). We identified two Arabidopsis plastid-localized PGDH genes (3-PGDH and EMBRYO SAC DEVELOPMENT ARREST9 [EDA9]) with a high percentage...

Abstract In the present work, pollen morphology of 22 species Anacardiaceae was analysed, occurring in state Bahia, Brazil. The palynological material obtained from specimens deposited herbaria. grains were acetolysed, measured, illustrated and described under light scanning electron microscopies. quantitative data statistically analysed according to sample size. presented monads, small medium ...