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Germination and Early Seedling Growth of Chaffy-Seeded Grasses at Negative Water Potentials

USDA-ARS, Southern Plains Range Res. Stn., 2000 18th Street, Woodward, OK 73801

View larger version (19K): [in a new window]   Fig. 1. Percentage 7-d seed germination of five chaffy-seeded grasses germinated at five different water potentials. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. SE of means is 4.7%.

View larger version (18K): [in a new window]   Fig. 2. Percentage 21-d seed germination of five chaffy-seeded grasses germinated at five different water potentials. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. SE of means is 3.5%.

View larger version (40K): [in a new window]   Fig. 3. Percentage seed germination of caryopses, debearded spikelets, and intact spikelets of five chaffy-seeded grasses germinated for 7 d. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. Means within species followed by the same letter are not significantly different at P 0.05 (t test). SE of means are shown above bar.

View larger version (45K): [in a new window]   Fig. 4. Percentage seed germination of caryopses, debearded spikelets, and intact spikelets of five chaffy-seeded grasses germinated for 21 d. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. Means within species followed by the same letter are not significantly different at P 0.05 (t test). SE of means are shown above bar.

View larger version (18K): [in a new window]   Fig. 5. Root length of seedlings of five chaffy-seeded grasses that had germinated in 7 d grown at five different water potentials. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. SE of means is 1.6 mm.

View larger version (46K): [in a new window]   Fig. 6. Root length of seedlings that had germinated in 7 d from caryopses, debearded and intact spikelets of five chaffy-seeded grasses. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. Means within species followed by the same letter are not significantly different at P 0.05 (t test). SE of means are shown above bar.

View larger version (18K): [in a new window]   Fig. 7. Shoot length of seedlings of five chaffy-seeded grasses that had germinated in 7 d grown at five different water potentials. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. SE of means is 1.3 mm.

View larger version (44K): [in a new window]   Fig. 8. Shoot length of seedlings that had germinated in 7 d from caryopses, debearded spikelets, and intact spikelets of five chaffy-seeded grasses. BB, big bluestem; IG, indiangrass; LB, little bluestem; SB, sand bluestem; YB, yellow bluestem. Means within species followed by the same letter are not significantly different at P 0.05 (t test). SE of means are shown above bar.