What is one advantage and disadvantage of self pollination?
Self-pollinated flowers have small, light weighted and fewer numbers of seeds. Continuous self-pollination results in the production of weaker progeny. there are no chances of the production of new species and varieties of plants. The chances of evolution is also reduced.
What is the disadvantages of continued self pollination in plants?
Disadvantages of continued self pollination in plants: This may lead to weakening of the variety of the species. The seeds produced through it are produced through it are poor in quality and give rise to less vigorous offspring. Hope it helps u.
What is advantage and disadvantage of self pollination and cross pollination?
Advantages of self – pollination In self- pollination, there is no diversity in the genes and therefore the purity of the race is maintained. The plants do not depend on external factors for pollination and even smaller quantities of pollen grains produce have a good success rate in getting pollinated.
What are the consequences of self pollination?
Self-pollination leads to the production of plants with less genetic diversity, since genetic material from the same plant is used to form gametes, and eventually, the zygote.
What are the long term effects of self-pollination?
Self-pollination can lead to inbreeding depression caused by expression of deleterious recessive mutations, or to the reduced health of the species, due to the breeding of related specimens.
What is the self incompatibility?
Self-incompatibility is a widespread mechanism in flowering plants that prevents inbreeding and promotes outcrossing. The self-incompatibility response is genetically controlled by one or more multi-allelic loci, and relies on a series of complex cellular interactions between the self-incompatible pollen and pistil.
How many types of self incompatibility are there?
This presentation includes, Single-locus self-incompatibility- {Gametophytic self-incompatibility (GSI) and Sporophytic self-incompatibility (SSI)},2-locus gametophytic self-incompatibility, Heteromorphic self-incompatibility,Cryptic self-incompatibility (CSI) and Late-acting self-incompatibility (LSI).
What is self incompatibility give two examples?
Sporophytic Self-Incompatibility (SSI) This form of self-incompatibility has been studied intensively in members of the mustard family (Brassica), including turnips, rape, cabbage, broccoli, and cauliflower. In this system, Rejection of self pollen is controlled by the diploid genotype of the sporophyte generation.
What are the possible reasons for graft incompatibility?
Graft incompatibility can occur for number of reasons, including:
- Virus or phytoplasma infection (see below)
- Genetic incompatibility or biochemical reaction of the rootstock and scion.
- When a weak cultivar is grafted onto an excessively vigorous rootstock.
What is translocated incompatibility?
A common form of incompatibility is “translocated” incompatibility, in which symptoms occur during plant development, and include early termination of scion and root growth, shriveling and early leaf drop, reduced carbohydrate translocation between scion, and rootstock leaf chlorosis evolving to leaf reddening.
What is localized incompatibility?
Localized (non-translocated) incompatibility. Graft combination in which a mutually compatible interstock overcomes the incompatibility of the scion and rootstock. The interstock prevents physical contact of the rootstock and scion and affects the physiology of the normally incompatible scion and rootstock.
What is stock scion relationship?
Stock -Scion Relationships. A grafted or budded plant can produce unusual growth patterns which may be different from what would have occurred if each component part of a graftage viz., rootstock and scion was grown separately or when it is grafted or budded in other types of rootstocks.
What are the symptoms of graft incompatibility?
Other internal symptoms in union zones of some incompatible grafts were suberisation and necrosis of cortex cells, excessive tannin accumulation indicated by abnormally darkly-stained bark tissues, formation of abnormal parenchyma in the xylem, and atypical dilation of horizontal ray cells and axial parenchyma.