Endosperm with chalazal haustorium, Biology

Endosperm with Chalazal Haustorium

In Grevillea robusta, a member of Proteaceae the endosperm is of the free nuclear type. The upper part of endosperm becomes cellular, whereas the lower part develops into a coenocytic, coiled worm-like structure called the 'vermiform appendage'. It serves as an aggressive haustorium, invades the chalaza1 tissue and transports nutrients to the main endosperm. The occurrence of a chalazal haustorium is also reported in several other plants viz. Macadamia thymifolia, Magnolia obovata, Iodinia rhombifolia etc.

The longest endosperm haustorium is found in Echinocystis lobata of the family, Cucurbitaceae. In Lomalia, besides the chalazal haustorium, numerous single-celled, finger-like projections arise from the cellular endosperm. These penetrate the nutritive nucellar tissue and help in increasing the absorptive surface of the endosperm.

Posted Date: 1/23/2013 6:39:04 AM | Location : United States







Related Discussions:- Endosperm with chalazal haustorium, Assignment Help, Ask Question on Endosperm with chalazal haustorium, Get Answer, Expert's Help, Endosperm with chalazal haustorium Discussions

Write discussion on Endosperm with chalazal haustorium
Your posts are moderated
Related Questions
In his experiments, Mendel noted that when two traits are involved in a genetic cross, they are inherited independently of each other. The reason for this is that A. genes on the s

Researchers (Helle et al., 2004) analyzed rates of twin births in the Sami population of Northern Scandinavia during the eighteenth and nineteenth centuries. They found that (1) a

what are protein? What is the constituential uni. Of protein? Briefly explain the various forms of protein?

Which one of the following has its own DNA? 1. Mitochondria 2. Dictyosome 3. Lysosome 4. Peroxisome Mitochondria

Q. Dietary Fats required for dyslipidemia? Dietary Fats: There is a consistent support for the hypothesis that both the quantity and quality of fat are directly associated with

What is Metabolism ?  The  sum total of vital activities ( movements , nutrition, growth, respiration, excretion , reproduction, behaviour ,etc.  Is the  life  of a living  bei

How boron affect the the synthesis of proteins ? Inadequate availability of boron tends to increase the loss of phosphorus from plant roots and also affects the synthesis of pro

Temporary Partial Disability - Injury from an Accident Such types of injuries which are easily recoverable and may not incapacitate the victim to perform duty apart from for

Explain about the Epilepsy? Epilepsy is a neuromuscular disorder in which transient seizures recur due to an abnormal brain activity. The brain, through all orderly electric ex

Food Habits Food Habits: These must be known  so that the diets  can  be  recommended keeping in mind the  food preferences  of  the patient. Whether a person is  a vegetarian