TY - JOUR AU - Shambulingappa, K. G. PY - 1969/04/01 Y2 - 2024/03/28 TI - Cytomorphological and Sterility Studies in Digitaria polevansii Stent JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 53 IS - 2 SE - Articles DO - 10.46429/jaupr.v53i2.11165 UR - https://revistas.upr.edu/index.php/jaupr/article/view/11165 SP - 106-112 AB - Detailed meiotic studies carried out in <em>D. polevansii</em> which was found to be highly pollen-sterile revealed that it has a somatic chromosome number of 2n = 36. This is the first report on the cytology and chromosome number of this species. Analysis of pachytene chromosomes has shown that this species contains two different types of chromosomes. In a few cells that were normal, bivalents were mostly observed at diakinesis and metaphase I. Information obtained through the analysis of chromosomes at pachytene, diakinesis, and metaphase I clearly indicates that <em>D. polevansii</em> is an allopolyploid. Several meiotic irregularities that are characteristic of desynaptics are reported. In addition to the desynaptic phenomenon it is also suggested that there might be some type of physiological imbalance causing disintegration of chromatin material and failure to form the cell wall. ER -