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
EPITHELIA L TISSUE OR EPITHELIA Epithelium term coined by Ruysh, it was applied originally to thin skin covering the nipple. (G.epi = upon, thele = nipple) Epithelial tis

Define Precautions for Acid Fast Staining? 1. Do not allow carbol fuchsin to dry on heating. 2. Maintain aseptic conditions. 3. Decolourization should be done till no red

Describe the Phylum Arthropoda and Metamorphosis? More than one million different species of arthropods are estimated to exist on the earth today-more than all other animal spe

Location of Overgloves - taped to the sides of the mobile cabinets for procedures such as patient examination and charting during non-aerosol producing procedures - on the p

Define Post-surgical Nutrition Support for CHD Patient? Nutrition support should be started as soon as possible. If oral not possible, enteral nutrition support should be pr

PRE-OPERATIVE NURSING MANAGEMENT OF CARDIAC SURGICAL PATIENTS Cardiac surgical patients generally get investigated thoroughly before getting referred to the surgeons. Many of

Facilitation Model - Models of Succession This is considered as the classical model of succession. It is based on the assumption that species of a previous stage are replaced

Protein X has an absorptivity of 0.4 mL . mg -1 . cm-1 at 280nm. What is the ab sorbance at 280 nm of a 2.0 mg. mL-1 solutionof protein X ? (Assume the light path is 1 cm).

Common Features of Eye and Limb Development A comparison of the embryonic development of the very much different organs, the eyes and the limb, points to various interesting

when pollen tube enters the embryo-sac,it has;