A male-sterile mutation in soybean (Glycine max) affecting chromosome arrangement in metaphase plate and cytokinesis.
A spontaneous male-sterile, female-fertile mutation affecting bivalent arrangement at the metaphase plate and cytokinesis was detected in line BR98-197 of the soybean breeding program developed by Embrapa - National Soybean Research Centre. Untill diakinesis, meiosis was normal with chromosome pairing as bivalents. From this phase, in several meiocytes, bivalents were not able to organize a single metaphase plate and remained scattered in the cytoplasm in a few or several groups. In these meiocytes, chromosomes segregated in both divisions giving rise to several micronuclei. However, the main cause of male sterility was the absence of cytokinesis after telophase II. Instead of the typical tetrads of microspores, four nucleate coenocytic microspores were formed. In the mutant, pollen mitoses did not occur, and after engorgement by starch, pollen underwent a progressive process of degeneration.
Bione
Nilton Cesar Pires
NC
Department of Sciences, Unicentro, 84500-000 Irati, PR, Brazil.
Pagliarini
Maria Suely
MS
de Almeida
Leones Alves
LA
D000483:Alleles; D002453:Cell Cycle; D002467:Cell Nucleus / Q000235:genetics; D002875:Chromosomes / Q000648:ultrastructure*; D048749:Cytokinesis; D003593:Cytoplasm / Q000378:metabolism; D006579:Heterozygote; D008540:Meiosis; D008677:Metaphase; D048629:Micronuclei, Chromosome-Defective; D008938:Mitosis; D009154:Mutation; D018521:Plant Physiological Phenomena; D011058:Pollen / Q000378:metabolism; D013025:Glycine max / Q000235:genetics*; D013692:Telophase