Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
Database Search: Once an open reading frame or the partial amino acid sequence has been pre-determined, the investigator compares sequence with others in the databases using a com
Name two stimulant drugs and state the undesirable side-effects of each. Amphetamine and cocaine are stimulant drugs. The side-effects of amphetamines are high blood pressure;
USES OF DRUGS - 1. Drugs are prescribed as medicines to prevent or cure a variety of diseases. 2. May be used to promot physical and mental health. 3. U
Q. Can you briefly explain about parasitism? The Parasitism is an inharmonious interspecific ecological interaction in which individuals of a species (the parasites) explore or
Chromosomes Karl Nageli and Hofmeister observed chromosomes in pollen mother cells of Tradescantia. Chromosome name proposed by Waldeyer. During cell division,
Ringworm in humans is caused by : 1. Bacteria 2. Fungi 3. Nematodes 4. Viruses Fungi
What are the problems that vertebrates required to solve to adapt to the terrestrial environment as they came from the aquatic habitat? How evolution does solve those problems?
Table provides you the classification of the living primates. The primate fossil history dates back to 60 million years i.e. to Paleocene times, more specifically to the cretaceous
BON E - Bone is the hardest tissue in the body and supports various organs. The inorganic salts present in the matrix are calcium phosphate, calcium carbonate, calci
Q. What is an example of intraspecific competition? The Intraspecific competition occurs in practically all species, for instance, the competition of humans for a job.
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!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd