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Influence of Triticum timopheevii Cytoplasm on Pollen Production and Dispersal in Common Wheat¹

Breeders of hybrid hexaploid wheat (Triticum aestivum L. aestivum group) are developing R-lines (pollinators) with cytoplasm and male-fertility restorer genes derived from Triticum timopheevii (Zhuk.) Zhuk. var. timopheevii. It is important to determine if such R-lines have reduced pollen production and dispersal compared to their respective B-lines.

The soft wheat cultivar ‘Monon’ was compared to three recovered backcross Monon-type R-lines with both cytoplasm and nuclear male-fertility restorer factors derived from T. timopheevii. Pollen production and dispersal were measured by pollen collection in automatic spore traps, percent anther extrusion, and percent seed set on A-lines.

In spore trap comparisons A-line 68846L2 dispersed significantly fewer total pollen grains than Monon, 1559 vs. 1975. The patterns of daily dispersal over the 7-day period were generally similar for the R-line and Monon although a significant day x pollinator interaction occurred.

The three R-lines were equal to Monon in anther extrusion with an average of 92% of the anthers extruded. The R-lines and Monon were equally effective as pollinators in effecting seed set on three A-lines (mean=60%). The small reduction in pollen dispersal of R-lines was not great enough to reduce the effectiveness of the R-lines as pollinators when compared to Monon at the 60% level of seed set for A-lines in these experiments.

Key Words: Hybrid wheat • R-lines • Triticum aestivum L.

² Assistant professor, Dep. of Agronomy, Georgia Agric. Exp. Stn., Experiment, GA 30212 and Lynn distinguished professor of Agronomy, Purdue Univ., respectively.

Received for publication August 20, 1979.