How many nuclei make an embryo sac in flowering plants?
Article Abstract:
The supernumerary synergid in the megagametophyte of Amborella has raised the question of whether the Polygonum-type embryo sac is derived by duplication of a four-nucleate structure or by reduction from a multicellular structure. The synergid-like neck cells resemble neck cells of the extant genus Cycas, indicating that they give rise directly to the synergids from a single archegonium.
Publication Name: BioEssays
Subject: Biological sciences
ISSN: 0265-9247
Year: 2006
User Contributions:
Comment about this article or add new information about this topic:
Endopolyploidy in seed plants
Article Abstract:
The biological significance of endopolyploidy is provision of high DNA amounts to support high synthetic demands in certain cells and compensation for a lack of nuclear DNA in species with small genomes. The occurrence of endopolyploidy in seed plants and its genetically as well as environmentally influenced variability is summarized.
Publication Name: BioEssays
Subject: Biological sciences
ISSN: 0265-9247
Year: 2006
User Contributions:
Comment about this article or add new information about this topic:
The molecular biology of the low-temperature response in plants
Article Abstract:
The potential perception and transduction pathways included in low temperature (LT) stress signaling are summarized. Designing new strategies to improve cold tolerance in crop varieties could increase the plant productivity and also expand the area under cultivation.
Publication Name: BioEssays
Subject: Biological sciences
ISSN: 0265-9247
Year: 2005
User Contributions:
Comment about this article or add new information about this topic:
- Abstracts: Relationship between transport of bacteria and their clogging efficiency in sand columns. Effect of bacterial extracellular polymers on the saturated hydraulic conductivity of sand columns
- Abstracts: Biotic and abiotic factors affecting plasmid transfer in Escherichia coli. Nitroaromatics are substrates for the TOL plasmid upper-pathway enzymes
- Abstracts: Viral lysis and bacterivory during a phytoplankton bloom in a coastal water microcosm. Detection of Arcobacter spp. in the coastal environment of the Mediterranean Sea
- Abstracts: History of migration studies in biological anthropology. Kin-structured migration: causes and consequences. Rural-to-urban migration in Latin America: an update and thoughts on the model
- Abstracts: Artificial selection shifts flowering phenology and other correlated traits in an autotetraploid herb. Additive and nonadditive genetic variation in avian personality traits