Fig. 2

Abnormalities during pollen mother cell (PMC) meiosis in 02428-4x. (a, b) degeneration of pollen mother cells (green arrow). (c) multiple nucleoli PMC (green arrow). (d) asynchronous division of PMC (green arrow), with one at metaphase II and another at prophase II. (e) abnormal spindle during formation of dyad, including ‘T’ type (green arrow) and oblique type (white arrow). (f) triad (green arrow). (g) abnormal tetrad, green arrow shows the linear type and white one shows the ‘T’ type. (h) abnormal giant tetrad (green arrow). (i) abortive pollens in bi-cellular pollen stage, with large and small pollen grains and spherical abortion type (green arrow). (j-l) degeneration of meiocytes in tetrad (j, k) and early microspore stage (l). Bars = 40 μm