Reference Report for SoyBase62303903
| Title: | Further cytological characteristics of a male-sterile mutant in soybean affecting cytokinesis and microspore development |
| Authors: | Bione, N.C.P., Pagliarini, M.S., de Almeida, L.A. |
| Source: | Plant Breed. 2003, 122(3):244-247 |
| Abstract: | A spontaneous male-sterile mutation affecting microspore development has been found in BR97-13509H line of the official Brazilian soybean breeding programme. Slightly abnormal and irregular chromosome segregation occurred in both meiotic divisions, albeit insufficient to explain total pollen sterility. 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. Coenocytic microspores resulting from the absence of cytokinesis have also been described in ms 1 and ms 4 male-sterile soybean mutants, although with certain differential characteristics. In the BR97-13509H mutant line, after interphase the four nuclei were rejoined in one or two metaphase plates and progressed through the first pollen mitosis. Pollen then underwent a progressive process of degeneration characterized by continuous cytoplasmic shrinkage. The second pollen mitosis failed to occur, and pollen sterility became total. |
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