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Seed Germination and Dormancy in Eastern Gamagrass

^a USDA-ARS, Southern Plains Range Research Station, 2000 18th Street, Woodward, OK 73801
^b USDA-ARS, Dale Bumpers Small Farms Research Center, 6883 South State Highway 23, Booneville, AR 72927

View larger version (17K): [in a new window]   Fig. 1. Illustration of an artificial fruit case (band) fashioned from an extruded plastic hexagonal tube (barrel of an ink pen) and a naked caryopsis used to test for mechanical seed dormancy in eastern gamagrass. The picture is not drawn to scale. The dimensions of the band were 7 mm wide from face to face and 5 mm tall. Each of the six faces were 4 mm wide and 5 mm tall. The circular opening of the band was 3 mm in diameter and open to the top and bottom.

View larger version (22K): [in a new window]   Fig. 2. Relationships of eastern gamagrass caryopsis weight and observed germination at the end of a 14-d germination period (A), and caryopsis weight and total potential germination (14 d observed germination plus firm seed remaining (B). Each data point is the mean of eight experimental units.

View larger version (19K): [in a new window]   Fig. 3. Relationships of eastern gamagrass caryopsis weight and seedling root length (A) and caryopsis weight and seedling shoot length (B). Seedling measurements were made at end of the 7-d germination period. Each data point is the mean of 8 experimental units.

View larger version (14K): [in a new window]   Fig. 4. Relationship of duration of moist prechill at 0 to 5 °C on the force required to open the cupulate fruit case of eastern gamagrass. Each data point is the mean of 10 experimental units.