Gametophytic incompatibility, Biology

Assignment Help:

Gametophytic Incompatibility

In GSI systems callose deposition is not evident on the stigma but is very conspicuous in the pollen tube. Sometimes the callose deposition occurs even in the germpore, inhibiting pollen germination. In the Poaceae, the rejection reaction is completed within a few minutes after pollination and subsequent rejection or acceptance takes 10 minutes with the exception of Poaceae and Oenothera, the recognition/rejection reaction in GSI system occurs after the pollen tube has grown about two third the length of the style.

Genetically the recognition factor on the male side has been attributed to the male gametophyte; the proteins incorporated during pollen wall development in the intine are involved. Since in GSI systems the rejection reaction is comparatively delayed, is also possible that the synthesis or activation, and release of the recognition substances are also delayed and they occur in the pollen tube. In some species the tubes show reduced level of carbohydrates and starch.


Related Discussions:- Gametophytic incompatibility

Ciliates, how the structure of ciliates facilitates their parasitism

how the structure of ciliates facilitates their parasitism

Patterns of metamorphosis, Patterns of Metamorphosis The pattern of me...

Patterns of Metamorphosis The pattern of metamorphosis is not the same in all insects and so metamorphosis can be broadly classified into 3 types: (1) Complete metamorphosi

Discovery of insulin, Q. Discovery of insulin? The discovery of insulin...

Q. Discovery of insulin? The discovery of insulin has dramatically changed the lives of people having type 1 diabetes. With this wonder drug diabetics can lead a normal, enjoya

Ecology and ecosystem, Ecology and Ecosystem The concepts of environme...

Ecology and Ecosystem The concepts of environment, ecology, ecosystem, energy flow and nutrient cycling in the foundation course on Science and Technology. As you are aware ec

Determine the types of plant sources - natural colourants, Determine the pa...

Determine the parts of plant source The natural food colourants from plant sources are classified into 5 types: a) Anthocyanins, b) Betalaines, c) Carotenoids, d) C

Corpus luteum in human females.., what is the fate of corpus luteum if egg...

what is the fate of corpus luteum if egg gets fertilised ?

Human physiology, which bones forms lhe non moving muscle attachment in

which bones forms lhe non moving muscle attachment in

What is symbiosis, Question Write a short note on the following: 1...

Question Write a short note on the following: 1 Gram staining 2 Embden-Meyerhoff-Parnas pathway 3 Interferons 4 Probiotics 5 Pasteurization 6 Endospores

Illustrate the functional properties of proteins, Functional properties of ...

Functional properties of protiens Immunoproteins such as C-reactive protein, Opsonin Immunoglobulins, Contractile respiratory, structural, enzymatic,

Which cells is the nervous tissue constituted, Q. Of which cells is the ner...

Q. Of which cells is the nervous tissue constituted? How is the generic function of this tissue related to the characteristics of the main cell type that forms it? The nervous

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