AI Article Synopsis
- The study examined microsporogenesis in 60 accessions of Brachiaria humidicola at Embrapa Beef Cattle Center.
- One specific accession (H121) exhibited an unusual cytokinesis pattern previously unrecorded in this species.
- Out of 900 meiocytes examined, significant percentages underwent abnormal division processes, leading to incomplete cytokinesis, which could hinder its use in breeding programs.
Article Abstract
Microsporogenesis was evaluated in the Brachiaria humidicola collection of the Embrapa Beef Cattle Center, represented by 60 accessions. One accession (H121) presented an abnormal pattern of cytokinesis that had never been reported in this genus. Among 900 meiocytes analyzed in the first division, 10.7% underwent precocious and multiple cytokinesis in metaphase I, fractionating the genome and the cytoplasm into two or more parts. The expected cytokinesis after telophase I did not occur. The abnormal meiocytes from the first division entered the second division but the second cytokinesis after telophase II was also abnormal. Among the 857 meiocytes analyzed in the second division, 10.9% presented abnormal, incomplete or total absence of cytokinesis. Dyads and binucleated microspores were recorded among the meiotic products. The use of this accession in the Embrapa breeding program is compromised.
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