TY  - EJOU
AU  - BIONE, NILTON CESAR PIRES 
AU  - PAGLIARINI, MARIA SUELY 
AU  - ALMEIDA, LEONES ALVES DE 

TI  - A male-sterile mutation in soybean (<i>Glycine max</i>) affecting chromosome arrangement in metaphase plate and cytokinesis
T2  - BIOCELL

PY  - 2005
VL  - 29
IS  - 2
SN  - 1667-5746

AB  - 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.
KW  - <i>Glycine max</i>
KW  -  meiosis
KW  -  metaphase plate
KW  -  cytokinesis
KW  -  male sterility

DO  - 10.32604/biocell.2005.29.177