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
Explain the Steps of Exercise You have learnt the steps of exercises in Block 3, Unit 1 of theory block. Let us review the steps. In aerobic exercises one has to under go fo

Q. Explain Waste produced during surgical process? Some of the waste products produced during a surgical process are dressings, sponges, gloves or other soft material dripping

Define Preparation of Dilutions - Standard or Total Plate Counts? 1. Serial dilution of homogenized sample in an appropriate diluent. Preparation of dilutions - Decimal dilu

Considering the independent segregation of all factors, how many types of gametes does a VvXXWwYyzz individual produce? What is the formula is to determinate such number? The m

Q. Illustrate Dilated cardiomyopathy? It is a disease of unknown etiology, affecting myocardium. Its diagnosis is established by presence of left ventricular dilatation and sys

Considering hybridization in a given trait like the color of the hair of a mammalian species (white/black) conditioned by a pair of different alleles under complete dominance (blac

Vibrio parahaemolyticus gastroenteritis While most other known food poisoning syndromes may be contracted from a variety of foods,  V. parahaemolyticus gastroenteritis is contr

OESTROU S CYCLE - Also known as heat period. Common in rabbit, cat, dog, sheeps. In this period desire for copulation occur. Possibility of fertilization is 100%.

Explain the Inoculating Loops and Needles? These are most commonly used tools for inoculation. The inoculating loop consists of insulating handle at the end of which inoculatin

How is it produced and what is the function of cholecystokin in the digestive process? The fat level of the chyme detect in the duodenum stimulates the secretion of cholecystok