Sporophytic and gametophytic self-incompatibility, Biology

Assignment Help:

Sporophytic and Gametophytic Self-Incompatibility

Besides the categories based on morphology, self incompatibility can be further classified into sporophytic or gametophytic types depending on the origin of factors that determine the mating types on the pollen side.

i) Gametophytic self-incompatibility (GSI) is governed by the genotype of pollen (male gametophyte) itself, e.g., Poaceae, Liliaceae, Solanaceae, Fabaceae, and Commelinaceae.

ii) Sporophytic self-incompatibility (SSI) the genotype of the sporophytic tissue which donates the pollen controls the incompatibility process, e.g., Asteraceae, Brassicaceae and Convolvulaceae.

Other characteristics of GSI and SSI systems are described in Table. A correlation has been established between the type of self-incompatibility, pollen cytology, and the site of inhibition. Generally, species that shed pollen at the 2 - celled stage are credited with gametophytic incompatibility (inhibition occurring in style) while those shedding 3-celled pollen show sporophytic incompatibility (zone of inhibition on stigma). Additionally, taxa having dry type of stigma are associated with sporophytic incompatibility whereas those with wet stigma show gametophytic incompatibility. There are a few exceptions to these correlations.


Related Discussions:- Sporophytic and gametophytic self-incompatibility

Agro-industrial -cereal and gram by-products, Cereal and Gram By-Products ...

Cereal and Gram By-Products Agro-processing is now regarded as the sun rise sector in view of its large potential in maintaining the nutritional quality of processed feed resource

Define about iodine metabolism, Define about Iodine Metabolism? Now, we...

Define about Iodine Metabolism? Now, we will very briefly study how iodine is absorbed, distributed in the body and ' excreted out. Like other nutrients, dietary iodide is eith

In which condition ulcer continues, Complete the sentence by choosing one o...

Complete the sentence by choosing one of the given biological terms. If an ulcer continues and ultimately erodes all the way through the wall of stomach or duodenum, condition

What is the patients rbc volume, Tina administered 1 liter of sterile disti...

Tina administered 1 liter of sterile distilled water IV to a patient. Predict the direction (increase, decrease, no change) you would expect Tina's infusion to have produced in the

What are tannins, What are Tannins? Long known for their inhibitory eff...

What are Tannins? Long known for their inhibitory effects on iron absorption, recent research indicates that tannins do have beneficial effects. Tannins are compounds of high m

Why is the proximity between ribosomes and amino acids, Why is the proximit...

Why is the proximity between ribosomes and amino acids important for the protein formation? What is the enzyme that catalyzes that reaction? The proximity among ribosomes and a

Explain dental care delivery system, Explain Dental Care Delivery System ...

Explain Dental Care Delivery System In the dental care delivery system: there are: patients, insurance payers and dentists For patients: Success = function + esthetics

Mechanics of locomotion, Mechanics of Locomotion Among annelids, poly...

Mechanics of Locomotion Among annelids, polychaetes, hence more primitive than the other two groups, show a more complex mode of locomotion. Necessarily, the locomotion in po

What is the main risk factor for skin cancer, Q. What is the main risk fact...

Q. What is the main risk factor for skin cancer? The major risk factor for skin cancer is solar exposition of the skin without protection against ultraviolet radiation (a poten

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