Operculum - seed appendages, Biology

Operculum - Seed Appendages

The term operculum is applied to a plug-like structure formed in the micropylar portion of the seed by proliferation of cells at the tip of the inner integument or the nucellus. An operculum has been observed in seeds of many monocotyledonous families, such as the Commelinaceae, Musaceae, Lemnaceae and Zingiberaceae, and a few dicotyledonous families like Bignoniaceae and Nymphaeaceae.

In Lemna paucicostata, cells at the tip of the inner integument undergo a remarkable expansion after fertilization and form a dome-shaped, stopper- like operculum. Cells of the operculum are thick-walled and contain an orange-red substance. During germination of the embryo the operculum becomes detached from rest of the seed and facilitates emergence of the embryo.

Posted Date: 1/23/2013 8:08:37 AM | Location : United States







Related Discussions:- Operculum - seed appendages, Assignment Help, Ask Question on Operculum - seed appendages, Get Answer, Expert's Help, Operculum - seed appendages Discussions

Write discussion on Operculum - seed appendages
Your posts are moderated
Related Questions
What grade did you get in biology?

Explain transports of substances or materials in the membrane by the help of Lipid-anchored proteins with examles

Susceptible Organisms When infection proves to be caused by a fully susceptible strain of TB, the initial phase of treatment should include isoniazid, rifampin and pyrazinamid

Q. What are primary indications for pharmacologic stress? The primary indications for pharmacologic stress are inability to exercise or the desire to identify viable myocardium

1) What are some characteristics that define the lifestyle of a parasitic nematode? 2) What are beneficial nematodes? Discuss their significance


mode of nutrition : out side the body

What is Mefloquine Mefloquine is taken once weekly, but recent reports of serious psychiatric adverse effects have prompted the manufacturer, along with the FDA, to strengthen

Fertilization - Pre-Embryonic Development Ovulation generally takes place between 9th to 14th day after the end of last menstrual period. Fertilization of oocyte initiates dev

FUNCTION S OF TESTOSTERONE - (a) It stimulates the growth and development of male secondary sex organs like the seminal vesicles, prostate and penis. It also helps to maintain