Types of plastids, Biology

TYPES OF PLASTIDS

(1) LEUCOPLASTS

These are present in ground parts of plants, internal parts of herbaceous stems and deep tissues of plants where sun light is not available.

Devoid of pigments and internal lamellar structures.

On the basis of function of leucoplast i.e. food storage, they are divided into three types - (i) Amyloplasts - Leucoplast storing starch.

(ii) Aleuroplasts - Leucoplast storing Proteins.

(iii) Elaioplasts - Leucoplast storing Oil, droplets and fats.

(2) CHROMOPLASTS

These are coloured plastid, responsible for colour of flowers, fruits and algae.

In algae brown colour due to phaeoplast and red colour due to rhodoplast. Phaeoplast contains pheucoxanthine and rhodoplast contains phycoerythrine.

Chromoplast contain different types of pigments (carotenes, Xanthophylls etc) Chlorophylls either absent or occur in very less amount.

Chromoplasts occurs mainly in pericarp and petals. In flowers chromoplast helps in pollination and in fruits these plastids help in dispersion of seeds because different colour attracts insects and birds.

Red colour of red chillies and red tomatoes is due to a red pigment of chromoplasts, "Lycopene". Lycopene is a type of carotene. Yellowish - orange colours of fruits are due to a-carotene, b-carotene and g-carotene. b-carotene is precursor of vitamin-A. Richest source of b- carotene are carrot roots.

Choromoplasts also occur in petals but colours of petals are mainly due to water soluble pigments which occur in cell sap. e.g. Anthocyanin - Blue or violet or red pigment; Anthoclor pigment responsible for yellow colour.

(3) CHLOROPLASTS

Schimper (1883) coined the term chloroplastid for green plastids.

Mayer called them Autoplast. Chloroplast name proposed by Erera.

Posted Date: 10/5/2012 7:27:22 AM | Location : United States







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

Write discussion on Types of plastids
Your posts are moderated
Related Questions
Adaptive Radiations The organisms all the time tend to establish harmony with their environment. This process, called adaptation, enables the organism to face the vagaries of

Are there different proteins made by the same total number of amino acids? Different proteins with the similar total number of amino acids may exist. In such cases the separati

Observing the development of flowers into fruit Collect specimens of flowers in dissimilar stages of maturity from newly opened buds to specimens in which the petals have falle

Explain National Nutritional Anaemia Prophylaxis Programme (NNAPP)? In past, both access to and intake of iron-folate tablets have been poor in children and therefore had a lit

Nursing Assessment  These children present with excessive salivation and droofing of saliva from the mouth, coughing, gagging, even choking and cyanosis at the lime of first f

Essential Features of Health Educator The health'educator should: be confident about the subject matter,  be able to converse skillfully in the language which is un


Q. Discovery of insulin? The discovery of insulin has dramatically changed the lives of people having type 1 diabetes. With this wonder drug diabetics can lead a normal, enjoya

Define transcellular fluid compartment - extracellular fluid? The transcellular fluid is a small compartment that represents all those body fluids which are formed from the tra

SKIN - Largest organ of body. It is covered by hairs or pelage i.e. pillifera. Study of skin is dermatology. Outermost covering of body. Skin is elastic and