Cytology of endosperm, Biology

Cytology of Endosperm

Normally the young endosperm is triploid as it is formed by the fusion of three haploid nuclei (male gamete + upper polar nucleus + lower polar nucleus). However, in some plants it shows ploidy of different levels due to variation in the number of polar nuclei which may be 1, 2, 4 or 8, depending upon the type of embryo sac. The number of polar nuclei contributing to the formation of endosperm is one only in Oenothera leading to the formation of diploid endosperm while it is 8 in Peperomia so the endosperm is 9n.

During further development, the cells of endosperm may undergo further polyploidization due to endomitosis and nuclear fusion. The highest level of ploidy is reported in Arum in which the nucleus of endosperm becomes 24576 n. The size of nuclei and the number of nucleoli also exhibit enormous variation.

Posted Date: 1/23/2013 7:02:38 AM | Location : United States







Related Discussions:- Cytology of endosperm, Assignment Help, Ask Question on Cytology of endosperm, Get Answer, Expert's Help, Cytology of endosperm Discussions

Write discussion on Cytology of endosperm
Your posts are moderated
Related Questions
Why TPP and TTP are vital for the nerves and cardiac tissues? TPP and TTP are interconvertible and arc involved in carbohydrate metabolism. As discussed above, when there is in

Explain Skin changes During Kwashiorkor? In many cases, dermatosis (changes in skin) is seen. Such changes are common in areas of friction. Dark pigmented patches, akin to sun-

Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4

Neuropsychological assessmnet of older children In the recent years, the field of child neuropsychology has undergone tremendous growth. There has been a burgeoning interest in

Botulism Botulism is a rapidly fatal motor paralysis. It is caused by ingestion of toxin of Clostridium botulinum in food. Many species of domesticated, wild animals and birds

Definition of probiotics and prebzotics? An early definition of probiotics is 'organisms and substances which contribute to intestinal microbial balance'. Later the word 'subst

Explain what is Light Microscope - Microscopy Modern light microscopes are compound microscopes. Here the magnified image formed by the objective lens is further enlarged by on

where are flame cells present?

The depicted food web is not complete, mainly because:  a. The number of producers is less than the number of consumers. b. There are no decomposers. c. Only secondary co

What is the role of pharmacologic therapy in the treatment of peri implantitis. Pharmacological therapy for patients presenting with an ailing implant involves subgingival irri