Stored metabolites - seed and fruit, Biology

Stored Metabolites - Seed and Fruit

In a large majority of seeds food is stored in the cells of the endosperm. In coconut, wheat and castor bean for example, it is the endosperm which stores the bulk of the food reserves. Food stored in endosperm is utilized by the embryo during development and seed germination. The endosperm is usually a triploid tissue derived from the fusion product of a male gamete (brought by pollen tube) and two polar nuclei in the central cell of the embryo sac. The endosperm surrounds the embryo all around and is ideal for nurturing the embryo till the seedling begins to photosynthesize and becomes antotrophic.

A second seat/site of nutritive tissue in some seeds is the perisperm, which represents the persisting nucellus. Nucellus is observed in some monocot families, such as the Zingiberaceae (to which turmeric and ginger belong), and a few dicotyledonous families, including the Piperaceae (e.g., black pepper) and the Nymphaeaceae (e.g., lotus). In Canna the chalazal cell of the ovule divides repeatedly to form a starch-containing tissue called chalazo sperm. Mature seeds containing persistent endosperm or perisperm are called albuminous and those lacking them exalbuminous.. Mature leguminous seeds lack endosperm. In pea, gram (chick pea) groundnut and a whole range of pulses the large cotyledons of the embryo take up the function of storage of food. In cotton seed also the large, lobed and folded cotyledons are the main repository of nutrients.

Posted Date: 1/23/2013 8:21:02 AM | Location : United States







Related Discussions:- Stored metabolites - seed and fruit, Assignment Help, Ask Question on Stored metabolites - seed and fruit, Get Answer, Expert's Help, Stored metabolites - seed and fruit Discussions

Write discussion on Stored metabolites - seed and fruit
Your posts are moderated
Related Questions
You are soon to be registered as a nurse and have applied to work in a unit where you will be caring for a diverse range of clients with medical and surgical complexities. You know

Cheese Production Cheese production involves the conversion of the milk protein, k-casein to paracasein by a defined, limited hydrolysis, catalysed by chymosin (rennin). In the

What is the difference between an ecosystem and a biome?

Contemporary Interests in Nutritional Biochemistry As  newer techniques in biochemistry have emerged from time to time, these were of immense help  in  the  understanding of ut

Quantitative Methods - Therapeutic diets Quantitative Methods: These are often essential for constructing  Lherapeutic diets.  The  two ways by which  this could be done are as

Which of the following is true for a G-protein? A. When an agonist binds to the binding site of a G-protein-coupled receptor (GPCR), this leads to GDP displacing a GTP bound to

Why do most of plants present opposite phyllotaxis? The Phyllotaxis is the way that leaves are arranged on shoots. Most of plants have opposite phyllotaxis that (alternating in

Q. Scheme of Classification of phylum hemichordate? These are about 90 species of hemichordates. All are marine and live in the open sea or in muddy sediments. Hemichordata wer

Which is better to grow plants in Rock sand or soil? When we grew plants inside, with there is no wind, and the plants in the rocks grew improved than the plants that were grow

What are all teh parts of a simple ciliated columnar epithilial cell?