Research Article

In Brassica rapa meiotic recombination; chromosome axis remodeling is critical

Sana-e-Mustafa

School of Biosciences, University of Birmingham UK

*Corresponding author e-mail: Sanamustafa45@gmail.com

(Received: 19/01/2024; Revised: 17/03/2024; Accepted: 29/04/2024; Published: 20/06/2024)

ABSTRACT

The primary mechanism by which breeders generate biodiversity is meiotic recombination, which permits genetic rearrangement at every generation. It facilitates the accumulation of advantageous alleles and eliminates harmful mutations. With the development of one to very rarely more than three crossovers that are not randomly distributed, this mechanism is highly regulated. To ensure correct parental chromosomal segregation and the creation of unique allelic combinations, meiotic recombination is essential. Finding the variables affecting the rate and distribution of meiotic crossings (COs) is crucial because this process is strictly regulated, especially for plant breeding initiatives. Nevertheless, few high-resolution recombination maps exist for most crops, including the Brassica genus, and little is known regarding sex differences and intraspecific variation. Here, using progenies of cross populations from the crossed F₁s population, we reveal fine-scale resolution recombination landscapes for two female and one male cross in Brassica rapa. Parents are from very different lines, which stands for higher quality and yield.

Keywords: Brassica rapa, crossover, meiosis, meiotic chromosome axis remodeling, meiotic recombination