Location and Identification on Chromosome 3B of Bread Wheat of Genes Affecting Chiasma Number.

ABSTRACT: Understanding meiotic crossover (CO) variation in crops like bread wheat (Triticum aestivum L.) is necessary as COs are essential to create new, original and powerful combinations of genes for traits of agronomical interest. We cytogenetically characterized a set of wheat aneuploid lines missing part or all of chromosome 3B to identify the most influential regions for chiasma formation located on this chromosome. We showed that deletion of the short arm did not change the total number of chiasmata genome-wide, whereas this latter was reduced by ~35% while deleting the long arm. Contrary to what was hypothesized in a previous study, deletion of the long arm does not disturb the initiation of the synaptonemal complex (SC) in early meiotic stages. However, progression of the SC is abno

SUBMITTER: Darrier B 

PROVIDER: S-EPMC9460588 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature