The following variables were calculated: percentages of germination (%G), dormant seeds (%DS) and dead seeds (%DS); relative frequency (f) according to CORSATO et al.
where GRI = daily germination rate index; [G.sub.i] = daily percentage of germination; [T.sub.i] = time (in days)
al in surveying of seed germination
anise(Pimpinellaanisum)under water deficit stresss howed that seed germination
, root and shoot length and seed vigor under stress are decreased.
The interactions of seed processing with plant species, germination
under moisture stress, and early seedling growth are not well defined.
Figure 1 illustrates the accumulated germination
for the best treatment.
There were no germinations
until the third day of incubation, with the highest number of seeds germinating on the fourth day of incubation, followed by a decline to zero on day seven.
In the autumn sowing, He-Ne lasers (632.8 nm) using 4-minutes exposure time, semiconductor lasers of 670 nm laser using 3-minutes exposure time, and 630-680 nm laser using 3-minutes exposure time, also significantly (p [greater than or equal to]0.01) increased seed germination
compared to control.
Seed colour has been reported to play a role in seed dormancy and germination
Temperature is a very important factor controlling seed germination
, affecting both the rate and final percentage of germination
The emergence of this physiological disorder has been related to the delay in germination
, decrease in the growth of seedling and plant, low green level, and low yield of the plant in field conditions.
Low molar solutions of gibberellic acid increased the germination
of gamagrass caryopses removed from the cupules, but had only small effects on dormancy when caryopses remained in the cupules (Anderson, 1985; Tian et al., 2003).
These compounds are known to modify growth, development of plants, including germination
and early seedling growth.