What is introgression in breeding?

What is introgression in breeding?

Introgressive hybridization (introgression) is genetic modification of one species by another through hybridization and repeated backcrossing. Introgression is important in the evolution of flowering plants. It is also important in plant breeding where a desirable trait can be transferred from wild to crop species.

Is brassica a tetraploid Napussica?

Brassica napus (AACC, 2n = 4x = 38) is a recent allopolyploid species formed about 7500 years ago by hybridization between B. rapa and B.

What causes introgression?

Introgression, also known as introgressive hybridization, in genetics is the transfer of genetic material from one species into the gene pool of another by the repeated backcrossing of an interspecific hybrid with one of its parent species.

What is the difference between hybridization and introgression?

Hybridization is the process of interbreeding between two genetically distinct individuals whereas introgression is the process where individuals of the same population interbreed and undergo a backcross with one or both of the parents.

Who explained the origin of tetraploid species of Brassica?

U’s triangle proposed that the three tetraploid species B. juncea (AABB genome, 2n = 4x = 36), B. napus (AACC, 2n = 4x = 38), and B.

What is the common name of Brassica campestris?

mustard
Solution : Brassica campestris Linn (a) Common name of the plant is mustard.

What is alien introgression?

Alien introgressions that were captured in the genome of diploid plants segregating from progenies of monosomic alien addition lines of S. lycopersicoides confer novel phenotypes with commercial and agronomic value in tomato breeding.

What is introgression an example of?

Why is introgression important?

Introgression is an important source of genetic variation in natural populations and may contribute to adaptation and even adaptive radiation. It can occur across hybrid zones due to chance, selection or hybrid zone movement.

What is introgression in biology?

Introgression (or “introgressive hybridization”) describes the incorporation (usually via hybridization and backcrossing) of alleles from one entity (species) into the gene pool of a second, divergent entity (species) (Anderson and Hubricht 1938; Anderson 1949).

What is the role of colchicine in plant breeding?

Colchicine is an important mutagen that works by preventing the microtubules formation and doubles the number of chromosomes. It is commonly used to develop polyploid plants and functions as a mitotic poison by producing many mutagenic effects on plants [28].

What is U’s triangle in plant breeding?

The Triangle of U is a theory about the evolution and relationships between members of the plant genus Brassica. It says that the genomes of three ancestral species of Brassica combined to create the three common vegetables and oilseed crop species that we know today.

What are varieties in Brassica?

Brassica species and varieties commonly used for food include bok choy, broccoli, cauliflower, cabbage, choy sum, kohlrabi, napa cabbage, rutabaga, turnip and some seeds used in the production of canola oil and the condiment mustard.

What is the meaning of Brassica campestris?

white turnip – white root of a turnip plant.

What is the purpose of alien chromatin detection?

Successful transfers can be greatly assisted by the precise identification of alien chromatin in the recipient progenies. Chromosome identification and characterization are useful for genetic manipulation and transfer in wheat breeding following chromosome engineering.

What is alien chromosome?

Monosomic alien addition lines (MAALs), which carry an additional chromosome from a related species through interspecific/intergenomic hybridization, have become powerful tools for genetic and genomic research.

What is the function of colchicine?

Colchicine is a medicine for treating inflammation and pain. It can be used to: treat flare-ups (attacks) of gout. prevent increased flare-ups of gout when you first start on a medicine like allopurinol – taken to manage your condition long term.

How do you apply colchicine to plants?

The apical meristems are treated for 5 hours with a 0.1% colchicine solution mixed with a penetrating agent, such as 2% dimethylsulfate, and a surfactant. Colchicine can also be applied by capping the plant, by the immersion method or by first splitting the base of each stem with a razor blade before immersion.

How many chromosomes are in Brassica?

Brassica juncea (brown mustard, 2n = 4 × = 36; genome AABB) is an allopolyploid species that originated from a spontaneous hybridization of Brassica rapa and Brassica nigra and contains many valuable traits.

How many chromosomes are in Brassica napus?

38
Brassica napus has an allotetraploid genome composition (AACC, 2n = 4x = 38) (Nagaharu, 1935; Allender and King, 2010).