International Journal of Mediterranean Ecology - Ecologia ...

ADEL DHIEF, MUSTAPHA GORAI, SAMIRA ASCHI-SMITI, MOHAMED NEFFATI
Germination (%)
Figure 1 – Germination percentage of three
Calligonum species after different
pre-sowing seed treatments.
22
50
40
30
20
10
0
50
40
30
20
10
0
50
40
30
20
10
0
C. comosum
0 2 4 6 8 10 12 14 16
C. azel
0 2 4 6 8 10 12 14 16
C. arich
0 2 4 6 8 10 12 14 16
Days after sowing
C T1 T2 T3 T4 T5 T6
C: untreated seeds (•); T1: seeds grinded in a mortar
with a pinch of clean silica sand (); T2: seeds rubbed
with sandpaper (); T3: seeds soaked in hot water
(); T4, T5 and T6: seeds immersed in sulphuric acid
for 10 (), 20 () and 30 min (*), respectively. The
symbols are the observed numbers of germinated
seeds, expressed as percent of sown seeds (n = 4).
Figure 3 – Changes in the index of germination rate
of three Calligonum species during 30 d
after different pre-sowing seed
treatments (Dhief et al.).
See Figure 2 for legend.
(C): untreated seeds (control); (T1): mechanical scarification by grinding
seeds in a mortar with a pinch of clean silica sand; (T2): mechanical
scarification by rubbing seeds with sandpaper; (T3): immersion in boiling
water for 10 min; (T4): immersion in concentrated sulphuric acid (96%) for
10 min; (T5): immersion in concentrated sulphuric acid for 20 min; (T6):
immersion in concentrated sulphuric acid for 30 min. Data represent mean
± SE (n = 4) and different letters indicate significant differences between
treatments at p < 0.05 (Duncan test).
Figure 2 – Changes in the final seed germination (a) and seed relative
germination percentages (b) of three Calligonum species during
30 d after different pre-sowing seed treatments (Dhief et al.).
ecologia mediterranea – Vol. 38 (1) – 2012