Summary
Low pollen fertility mutants in the M7 generation were identified in the field from ethyl methane sulfonate-treated material of the rice cultivar M-201. M7 plants exhibited low pollen fertility levels (2%–28%) with mean values 7.5-fold less than M-201. Pollen fertility increased 3 to 44-fold when the M7 field plants were ratooned and grown in a growth chamber with a 12 hr daylength. High fertility of all F1's was observed in crosses with normal and pollen sterile lines. Chi squared analyses of five F2 populations indicated that, depending on the cross, pollen fertility was governed by one to three recessive nuclear genes. Transgressive segregation for both low and high fertility was observed in all but one cross. A 19% to 66% increase in fertility of late tillers over main stems was observed in mutants under field conditions. Interruption of the dark period with 5 minute treatments of red or far-red light resulted in altered fertility levels and suggested involvement of phytochrome in regulation of pollen fertility.
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Approved for publication by the Director of the Louisiana Agricultural Experiment Station as manuscript number 94-09-8131.
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Oard, J.H., Hu, J. Inheritance and characterization of pollen fertility in photoperiodically sensitive rice mutants. Euphytica 82, 17–23 (1995). https://doi.org/10.1007/BF00028705
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DOI: https://doi.org/10.1007/BF00028705