Abstract
Tetracycline (TC), a widely used antibiotic, exhibited a marked effect on microsporogenesis when administered to cell at early prophase sub-stages (zygotene, pachytene, diplotene and diakinesis). Meiotic aberrations induced by tetracycline consisted of stickness, terminal deletion heteromorphic bivalents, fragments, bridges, laggards and polyads. At a 20 μg/ml TC concentration pollen-mother-cells failed to undergo meiosis and showed degeneration of nuclei into small chromatin droplets, anthers remained in metastasis for about 10 days and then shrivelled up without forming pollen grains. Chromosome aberrations were also observed in bulbs and seedlings obtained from seeds of treated inflorescences. Hyprodiploid cells were observed in 16.2% of mitotic cells in seedlings obtained from plants treated with 16 μg/ml TC. Root tio cells of seedlings as well as that of bulbs were devoid of breakages.
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