Tetrad shape and aperture pattern ontogeny in pollen Patterns of male cytokinesis are suspected to play a role in the diversity of aperture patterns found in pollen grains of angiosperms. By comparing two eudicots...
Category - Cells, Genes & Molecules
botanyone
Polyembryony in non-apomictic citrus genotypes
Cases of polyembryony have been reported in non-apomictic genotypes as a consequence of 2x × 4x hybridizations and in vitro culture of isolated nucelli. Aleza et al. demonstrate that embryogenic cells or proembryos...
Sense and sensibility to sex and sustainability
Two-thirds of the energy in the food we eat comes from seeds – including wheat, rice, maize, oilseeds – and their associated storage structures as fruits. Without seeds, the direct product of sexual...
Editor Pat Heslop-Harrison
Windows of opportunity in embryo development
Variation in mature seed size is the result of a complex array of interactions involving genes, genomes and environment that may change during development. Diggle et al. (pp. 309–319) study the dynamics of embryo and...
Gene dispersal in wild carrot populations
How far can a gene disperse? Historical and contemporary gene dispersal can be estimated from spatial genetic structure and paternity analysis, and Rong et al. (pp. 285–296) find that an estimate of gene flow in Daucus...
Factors leading to hybrid lethality in Nicotiana
Hybrid lethality is a type of postzygotic isolation and is observed in some species of Nicotiana in association with genes encoded on the Q chromosome. Tezuka et al. (pp. 267–276) make interspecific crosses of eight...
Hourglass cell development in soybean seed coat
Hourglass cells (HGC) are prominent cells in the legume seed coat. Miller et al. (pp. 235–242) document HGC development in soybean, Glycine max, and relate structural changes to expression of an HGC-specific soybean...
Assembly and repair of photosystem II (Invited Review)
Considerable attention has been focused on how photosystem II (PSII) is assembled in vivo and how it is repaired following irreversible damage by visible light (so-called photoinhibition). Nixon et al. (pp. 1–16)...
