Crop Science Journal of Natural Resources and Life Sciences Education
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Published in Crop Sci 11:864-865 (1971)
© 1971 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Effects of Temperature and Photoperiod on Spring Wheat Pollen Viability1

J. R. Welsh and A. R. Klatt2

Seven cultivars of spring wheat (Triticum aestivum L. em Thell.) including the cultivars ‘Chris,’ ‘Crim,’ their male-sterile counter-parts, the restorer ‘Dirk’ and the Fl's of the male-steriles x Dirk were subjected to the nine combinations of 12-, 14-, and 16-hour photoperiods and 24 C - 7 C, 30-13, .and 35-18 day-night temperature regimes. Pollen viability was based on stainable grains and seeds per spike were counted. The r value between pollen stainability and seed counts was 0.87.

Temperature had the greatest effect on pollen viability iu the experiment. In general, high temperatures reduced pollen viability. Photoperiod had minor effects with longer periods slightly reducing viability. Chris and Crim had the highest viabilities. The pollen viability of Dirk tended to drop sharply with high temperatures. The Fl's were intermediate. Male-sterile Chris had consistently low pollen viability. Male-sterile Crim had quite viable pollen at low temperatures and short to medium daylengths, but low viabilities at other environments. Genotype x environment interactions occurred only at the 14-hour photoperiod where viabilities of Chris, Crim, and male-sterile Crim were not reduced at high temperatures.

Key Words: Hybrid wheat • Male sterility • Fertility restoration • Wheat seed

1 Contribution from the Department of Agronomy, Colorado State University Experiment Station, Ft. Collins 80521. This work was supported in part hy DeKalb Ag Research, Inc., DeKalb, Ill. Published with the approval of the Director of the Colorado State University Experiment Station as Scientific Series Paper No. 1627.

2 Associate Professor of Agronomy (Crops), Colorado State University; and Wheat Breeder, CIMMYT, Londres 40, Mexico 6, D.F. (formerly NDEA Fellow, CSU), respectively

Received for publication April 15, 1971.




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