Autochory - dispersal of seeds, Biology

Autochory - Dispersal of Seeds

This mechanism of self-dispersal is based on forceful expulsion of the seed from the fruit because of desiccation or turgidity of the cells of the pericarp. In balsam, Impatiens spp., for example, the fruit is a cylindrical capsule formed by the, fusion of five carpels. The fruit wall comprises three regions of which the middle is made up of radially elongated cells with high turgor pressure. This zone is termed expansion zone. In the dry, ripe capsule the cells of the expansion zone are in a state of high tension. However, the inner portion of the pericarp consists of 2 or 3 layers of collenchyma which offer resistance. At this stage even a mild touch or jerk results in separation of the carpels at the base. The five carpels instantly curl inward throwing the seeds at a distance of about 2 meters.

In Arceuthobium sp, the fruit is a pseudo berry enclosing a single seed. The mesocarp is formed by viscin cells. When the fruit is detached from its stalk the cells of the viscid layer generate a high pressure and the pericarp contracts to hurl the seed out with great force.

Posted Date: 1/24/2013 12:21:01 AM | Location : United States







Related Discussions:- Autochory - dispersal of seeds, Assignment Help, Ask Question on Autochory - dispersal of seeds, Get Answer, Expert's Help, Autochory - dispersal of seeds Discussions

Write discussion on Autochory - dispersal of seeds
Your posts are moderated
Related Questions
Following statement true for prokaryotic or eukaryotic? They use deoxyribonucleic acid as their major information storage molecule.

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

Proteins of Plant Origin - Nuts Nuts are excellent sources of proteins. Examples of nuts include cashew nuts, almond nuts , hazel nuts , coconuts, walnuts, brazil nuts ,cashew

Submerged implants Decision has to be made between two techniques. These techniques are: Technique 1: Stage two using a mucoperiosteal flap Technique 2: Stage two done wi

Define the effect of niacin deficiency on Nervous System? Delirium is the most common -mental disturbance in acute pellagra. Dementia is more frequently seen in the chronic cas

Why is carbon monoxide toxic for humans? Hemoglobin "likes" carbon monoxide (CO) much more than it likes oxygen. When there is carbon monoxide in the inhaled air it binds to he

Q. How do nucleotides of mRNA chains encode information for the formation of the amino acids sequences of a protein? There are only four types of nitrogen- containing bases tha

CHF complicating IE is primarily the result of valve destruction or distortion or rupture of chordae tendinae. Intracardiac fistulas, myocarditis, or coronary artery embolization m

Differentiation of Tissues - Root Apex New cells generated from the divisions of meristematic cells start expanding and differentiating further. Epidermis, cortex and stele a

CHOLINE Found in egg liver & kidney. Synthesized in body with acetyle coA. It forms acetylcholine. Deficiency causes damage to kidney.