Defossé, G.E., M.B. Bertiller, and R. Robberecht. 1995. Germination characteristics of Festuca pallescens, a Patagonian bunchgrass with reclamation potential. Seed Science and Technology 23:715-723.
Summary. The influence of light, temperature, and soil
water content on the germination of Festuca pallescens,
an important forage species native to the steppe zone of Patagonia,
Argentina, was examined in the laboratory. Seeds of F. pallescens,
collected along an elevational gradient from 650 to 950 m a.s.l.
on the Media Luna Ranch (43°36´ S, 71°25´
W) were tested for viability and germination. In petri dishes
containing top soil of the collection area, 10 seeds were sown
at a depth of 5 mm (dark treatment) and 10 on the soil surface
(light treatment). The experiment was replicated five times at
soil water contents of 4, 8, and 16% and temperatures of 5, 10,
15, and 20°C. Seeds were considered germinated when either
the coleoptile reached 5 mm for the light treatment or when it
protruded the soil surface for the dark treatment. Festuca
pallescens seeds showed a viability of 99.5%. Exposure to
continuous light delayed the beginning of germination, but had
no influence on total germination percentages. A soil water content
of 16% and medium to high temperatures (10, 15, and 20°C)
rapidly promoted germination, which reached 97% after 20 days
of incubation. Germination was reduced by 40% at a soil water
content of 8%. In all cases, a 5°C soil temperature delayed
the beginning of germination and slightly reduced its final germination
percentages. Sporadic germination occurred at 4% soil water content
at 10°C, and none at any other temperature. Under field
conditions, sowing should be practiced during the fall, when soil
moisture and temperatures are optimum for germination.
This research was supported with grants from Consejo Nacional de
Investigaciones Cientificas y Téchnicas (CONICET; PID 3058100/88), Argentina, and the Idaho
Forest, Wildlife and Range Experiment Station.