Repetitive sequences and structural chromosome alterations promote intraspecific variations in Zea mays L. karyotype.

ABSTRACT: LTR-retrotransposons, knobs and structural chromosome alterations contribute to shape the structure and organization of the Zea mays karyotype. Our initial nuclear DNA content data of Z. mays accessions revealed an intraspecific variation (2 C = 2.00 pg to 2 C = 6.10 pg), suggesting differences in their karyotypes. We aimed to compare the karyotypes of three Z. mays accessions in search of the differences and similarities among them. Karyotype divergences were demonstrated among the accessions, despite their common chromosome number (2n = 20) and ancestral origin. Cytogenomic analyses showed that repetitive sequences and structural chromosome alterations play a significant role in promoting intraspecific nuclear DNA content variation. In addition, heterozygous terminal deletion in chromoso

SUBMITTER: Silva JC 

PROVIDER: S-EPMC7264354 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature