Flowering Periods, Seed Yield Components, Seed Quality, and Patterns of Seed Shattering in : Effect of Taxonomy and Nitrogen Fertilization.

Perennial warm-season grasses typically have reduced seed yield, making it essential to identify the critical seed yield components. An induced increase in nitrogen could help determine which components are most limiting. This research aimed to estimate seed yield components in ; evaluate N fertilization effects on the reproductive phase, seed yield components, and seed quality; and establish the pattern of seed shattering over time.

Structural and Morphogenetic Characteristics in : Responses to Nitrogen Fertilization, Season, and Genotype.

Understanding leaf generation dynamics, their seasonal changes, and their responses to nitrogen fertilization (NF) is key to improving pasture utilization efficiency. The objectives of this research were to determine structural and morphogenetic variables underlying changes in herbage mass on a set of genotypes. Ten genotypes were evaluated in experimental plots following a completely randomized block design under a split-plot arrangement for two N-rates during four periods.

Alternative Evolutionary Pathways in Involving Allotetraploidy, Sexuality, and Varied Mating Systems.

The genetic systems of species have not been extensively studied. We analyzed the ploidy, reproductive mode, mating system, and fertility of four species-, , , and . An analysis of 378 individuals from 20 populations of northeastern Argentina was conducted.

Reproductive and Agronomic Characterization of Novel Apomictic Hybrids of (Poaceae).

The tetraploid germplasm of contains a large diversity that can be used to generate better forages. The objective was to evaluate a group of and apomictic hybrids for a set of agronomic traits and apomixis expressivity. Forage yield, cold tolerance, winter regrowth, and seed yield were evaluated.

How to Become an Apomixis Model: The Multifaceted Case of .

In the past decades, the grasses of the genus have emerged as a versatile model allowing evolutionary, genetic, molecular, and developmental studies on apomixis as well as successful breeding applications. The rise of such an archetypal system progressed through integrative phases, which were essential to draw conclusions based on solid standards. Here, we review the steps adopted in to establish the current body of knowledge on apomixis and provide model breeding programs for other agronomically important apomictic crops.

Reproductive Systems in : Relevance for Germplasm Collection and Conservation, Breeding Techniques, and Adoption of Released Cultivars.

The objective of this review is to analyze and describe the impact that mode of reproduction in has on germplasm conservation, genetic improvement, and commercialization of cultivars. Germplasm collection and conservation can now be rethought considering the newly available information related to how diversity is allocated in nature and how it can be transferred between the sexual and apomictic germplasm using novel breeding approaches. An inventory of species and accessions conserved around the world is analyzed in relation to the main germplasm banks.

Segregation for sexual seed production in Paspalum as directed by male gametes of apomictic triploid plants.

Background And Aims: Gametophytic apomixis is regularly associated with polyploidy. It has been hypothesized that apomixis is not present in diploid plants because of a pleiotropic lethal effect associated with monoploid gametes. Rare apomictic triploid plants for Paspalum notatum and P.