Wet stigma - category of stigma, Biology

Assignment Help:

Wet Stigma - Category of Stigma

Petunia shows several randomly distributed 2-celled papillae on its surface. In a developing stigma, the epidermis is covered by a continuous, thin cuticle and the subepidermal cells are densely cytoplasmic, without any intercellular spaces. In a mature stigma, the cells of the subepidermal zone elongate to form a secretory zone with large schizogenous cavities filled with a lipoidal secretion. The secretory zone is delimited from the basal part of the stigma by a storage zone.

The cells of the stigma contain numerous amyloplasts and a large amount of lipid globules which gradually coalesce and migrate to the peripheral part of the cytoplasm and eventually out of the cell. The lipoidal exudate accumulates between the cell wall and the cuticle. In the secretory zone the exudate fills the large intercellular, schizogenous cavities. At the time of anthesis, the epidermis becomes disorganized, the cuticle is discarded in the form of flakes and the accumulated exudate spreads over the entire surface of stigma. A very thin layer of water is also trapped.


Related Discussions:- Wet stigma - category of stigma

Can obesity causes the cardiovascular disease, Q. Can Obesity causes the ca...

Q. Can Obesity causes the cardiovascular disease? As you know obesity or excessive weight is the primary cause of cardiovascular disease. It is an independent risk factor for h

Explain how movement is controlled in protozoans., Movement is even control...

Movement is even controlled by organelles, cilia and flagella. These and the pseudopodia in the amoebas give these small creatures movement, something we associate with animals. Es

Pelagic zone - organisation of the marine ecosystem, Pelagic Zone - Organis...

Pelagic Zone - Organisation of the Marine Ecosystem The waters contained in the sea basin, constitute the pelagic zone which is divided into The neritic zone situ

Difference between genomes in simple eukaryote, What are the differences be...

What are the differences between genomes in simple eukaryotes vs complex eukaryotes?

Significance of apomixis, Significance of Apomixis Apomixis offers th...

Significance of Apomixis Apomixis offers the possibility of indefinite multiplication of especially favorable biotypes without any variation due to segregation or recombinati

What is fontan operation and modifications, What is Fontan Operation and Mo...

What is Fontan Operation and Modifications ? Earlier reported to have 20 per cent mortality, it has come down to five per cent in specialized centres. In the earlier series th

Explain the acid fast staining, Explain the Acid Fast Staining? Acid fa...

Explain the Acid Fast Staining? Acid fast staining is a type of differential staining used for identification of certain bacteria, e.g. Mycobacteria which cannot be stained rea

Define procedure for testing the presence of sugar in milk, Define Procedur...

Define Procedure for Testing the Presence of Sugar in Milk? 1. Take 0.1 ml of milk sample in a test tube. 2. Add 0.2 ml of resorcinol solution (0.05 gm of resorcinol in 100

Explain about the term accommodation, Explain about the term accommodation....

Explain about the term accommodation. Normally, the human eye focuses at objects at infinity, without exerting any power. This implies that while a person is observing an objec

Cnidarians: obelia, why is obelia considered to be of special interest in Z...

why is obelia considered to be of special interest in Zoology as an animal showing an intermediate grade of organisation

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd