The aim of the study was to investigate changes in the localization of arabinogalactan proteins (AGPs) during ovule development in Fragaria x ananassa Duch. cv. ‘Mount Everest’. For the first time, the localization of AGPs was studied in a hybrid Fragaria x ananassa, which is a facultative apomict. The AGP epitopes were revealed with the use of JIM13 mAb after immune cyto chemical reaction and ...

Sporogenesis and gametogenesis in the monotypic genus Sladenia is reported for the first time. The anther wall is of the monocotyledonous type of formation and consists of four-layers, namely a glandular tapetum, one middle layer, an endothecium, and an epidermis. Fibrous thickenings are developed in the epidermis at or near the stage of anther maturity rather than in the endothecium. Successiv...

To investigate the genetic and molecular regulation that the female gametophyte could exert over neighboring sporophytic regions of the ovule, we performed a quantitative comparison of global expression in wild-type and nozzle/sporocyteless (spl) ovules of Arabidopsis thaliana (Arabidopsis), using Massively Parallel Signature Sequencing (MPSS). This comparison resulted in 1517 genes showing at ...

Flowers of the previously described Arabidopsis tso1-1 mutant had aberrant, highly reduced organs in place of petals, stamens, and carpels. Cells of tso1-1 flowers had division defects, including failure in cytokinesis, partial cell wall formation, and elevated nuclear DNA content. We describe here two new tso1 alleles (tso1-3 and tso1-4), which caused defects in ovule development, but had litt...

The genetic control of apomixis was studied in numerous segregating progenies originated from intercrossing and selfing of obligate sexual and facultative apomictic parents in Poa pratensis by means of the flow cytometric seed screen. The data support a novel model with five major genes required to control asexual seed formation: the Apospory initiator (Ait) gene, the Apospory preventer (Apv) g...

Premise of research. The flora the Maywood Formation, one only three Devonian floras previously recognized in western North America, is known from a brief report focused on stratigraphy and has never been characterized more detail. A detailed assessment this associated animal fossils implications for age depositional environments Formation plant biogeography.Methodology. Fieldwork at Cottonwood...

Classical arabinogalactan proteins (AGPs) are an abundant class of cell surface proteoglycans widely distributed in flowering plants. We have used a combination of enhancer detection tagging and RNA interference (RNAi)-induced posttrancriptional silencing to demonstrate that AGP18, a gene encoding a classical arabinogalactan protein, is essential for female gametogenesis in Arabidopsis thaliana...

Unequal contribution of the parental genomes to the developing embryo can occur by a variety of mechanisms. In Dropsophila, for example, maternally produced transcripts determine the embryonic formation of body axes (St. Johnston and Nüsslein-Volhardt, 1992). Inequality in parental contribution of a different nature is achieved by genetic imprinting, in which either the maternal or paternal all...

The PRETTY FEW SEEDS2 gene encodes a homeodomain protein that regulates ovule development. In peptide alignments spanning the homeodomain and the WOX domain, PFS2 shared 95% amino acid identity with the PRESSED FLOWER and WUSCHEL proteins. In the pfs2-1 allele, the integuments display morphological abnormalities and 95% of the embryo sacs fail to develop properly, which results in reduced fecun...