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Pollen Production and Pollen Shedding of Hard Red Spring (Triticum aestivum L. em Thell.) and Durum (T. durum Desf.) Wheats¹

We have investigated the relative pollen-shedding abilities of 11 hard red spring and 3 durum wheat varieties and the relationships between pollen-shedding and other varietal characteristics.

The varieties differed in amount of pollen shed, number of pollen grains/anther, percent anthers extruded, tillers/plot, fertile florets/plot, fertile florets/tiller, yield, and kernel weight. Anther extrusion varied from 72% for ‘Thatcher’ spring wheat to 22% for ‘Lakota’ durum wheat. Number of pollen grains/anther varied from 3,867 for ‘Rescue’ to 2,687 for ‘Fortuna’ spring wheat.

The amount of pollen shed was positively correlated with percent anthers extruded and tillers/plot but negatively correlated with fertile florets/tiller. Path coefficient analysis indicated that percent anther extrusion had the largest direct effect on pollen shedding. Pollen shedding ability of a variety was predicted on the basis of percent anther extrusion, pollen grains/anther and fertile florets/plot.

Key Words: anther extrusion • seed set • hybrid wheat • cytoplasmic male sterility

² Research Geneticist, Crops Research Division, ARS, USDA, Fargo, N. D. 58102, (formerly Research Ass't., Montana Agr. Exp. Station, Bozeman).

³ Research Agronomists, Crops Research Division, ARS, USDA, Bozeman, Montana.

Received for publication February 29, 1968.

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