Morphological nature of endosperm, Biology

Morphological Nature of Endosperm

The morphological nature of endosperm in angiosperms has been a subject of much discussion in evolution. The endosperm in gymnosperms is a gametophytic (haploid) tissue as it develops directly by the continued free nuclear divisions of the functional megaspore. In angiosperms, however, it develops from the primary endosperm nucleus which is normally formed by the fusion of two polar nuclei and a male nucleus and hence it is neither haploid nor diploid but generally triploid. Some workers have suggested that the endosperm in angiosperms is a gametophytic tissue just like those of gymnosperms, the only difference being that its development remains arrested till the entry of the pollen tube into the ovule.

Other embryologists have considered it as a second embryo or a maimed embryo. The most agreeable view regarding the morphological nature of the endosperm in angiosperm is that it is an undifferentiated tissue which shows different degrees of polyploidy. By suppressing the growth of the embryo in a seed, it has been possible to induce triploid shoot bud development in the endosperm. However, truly triploid plants have not been obtained so far.

Posted Date: 1/23/2013 7:03:01 AM | Location : United States







Related Discussions:- Morphological nature of endosperm, Assignment Help, Ask Question on Morphological nature of endosperm, Get Answer, Expert's Help, Morphological nature of endosperm Discussions

Write discussion on Morphological nature of endosperm
Your posts are moderated
Related Questions
Determine the working of Law of diminishing return According to the 'Law of diminishing return' the increase in the yield by a unit increase of the defi cient factor is proport

Adverse Effects Of interferon alfa Intramuscular or subcutaneous injection of interferon is commonly associated with an influenza-like syndrome, especially during the first wee

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

Which of the following statements about buffers is true? Select one: a. A buffer composed of a weak acid of pKa = 5 is stronger at pH 4 than at pH 6. b. At pH values lower

Polarity in Regeneration A distinct polarity or gradient exists in planarians (and in other animals). The meaning of this is that in any piece or segment of the body; its ant

What's the difference between theory and hypothesis and explain the importance for a hypothesis to be testable and falsifiable in order for the scientific method to be applied?

Define Nutrition Education for prevention of vitamin a deficiency? Ignorance, you may recall studying earlier, is an important determinant of vitamin A deficiency. There is, th

DETERMIN A TIO N OF THE AGE OF FOSSIL - Radioactive clock (Boltwood -1907) - Half life of uranium is 4.5 billion years. This means half of total uranium disintegrates

Define the Classifications of carbohydrates based on number of carbon?   A chain-form monosaccharide that has a carbonyl group (C= O) on an end carbon forming an aldehy

State the term - Halsted Reitan varies with the particular test Scoring for the Halsted Reitan varies with the particular test, such that individual scores may be expressed in