Ecologia Mediterranea

More documents

Recommendations

Info

placed in 10 cm diameter plastic dishes. The filter papers were moistened daily with the five different concentrations of the extracts used. Control experiments whose filter papers were moistened with distilled water were set (30 seeds each). Each experiment was replicated four times. All Petri dishes were kept in dark incubators maintained at room temperature at 15/25 o C. Germination was monitored daily. The germinated seeds were recorded every day for a period of 14 days after sowing. Seeds were considered germinated when the radical had protruded 2 mm through the seed coat. After 14 days of incubation, germination was expressed as the Final Percentage of Germination (FG%) and Rate of Germination (germination time) (GR) was calculated by seeds day. Statistical analysis Averages of the main effects and their interactions were compared using the revised Least Significant Difference test (LSD) at 0.05 level of probability (Tukey test). Results Germination rate: the percentage of germination was the lowest at 10 o C (25%). It reached its maximum at 25 o C (80%) (Fig. 1A). Germination in the control started on day 10 under 25 o C (Fig. 1B). The percentage of germination decreased with the increase of the osmotic potential especially at –7 bar (Fig. 2). It reached its maximum at 0 and at –1bar, 100-98% respectively (Fig. 2A). The delay before germination severely increased at –7 bar (Fig. 2B). The germination was influenced by the soil depth (Fig. 3). Although the lowest depth (1-2cm) tested was suboptimal (100% of germination Fig. 3A). In contrast, highest soil depth (5cm), caused germination inhibition and seeds buried at 6cm showed no emergence (Fig. 3B). The highest germination rate (98%) was observed at 0.0g/l NaCl. The lowest germination rate (22%) occurred under 15g/l (Fig. 4A). Germination treatment under NaCl 0.0- 3.0 g/l started on day 1 (Fig. 4B). The Rate of Germination (RG) of P. dichotomum under 12g/l NaCl was 42% at day -8, then no radical and no hypocotyl length can ecologia mediterranea – Vol. 38 (2) – 2012 percentage of germination (%) germination time (day) Effects of abiotic stress on the germination of Pennisetum dichotomum 120 100 80 60 40 20 0 16 14 12 10 8 6 4 2 0 B A 10 25 35 10 25 35 temperature (°C) Figure 1 – Percentage of seed germination of Pennisetum dichotomum (A) and germination time (B) in response to three temperature values. germination (%) time of germination (day) 120 100 80 60 40 20 0 10 9 8 7 6 5 4 3 2 1 0 B 0 -1 -3 -7 -10 -16 0 -1 -3 -7 -10 -16 hydric potential (bar) Figure 2 – Percentage of seed germination of Pennisetum dichotomum (A) and germination time (B) in response to hydric potential values. A 19
CHIRAZ CHAFFEI HAOUARI, AFEF HAJJAJI NASRAOUI, HOUDA GOUIA AND ALI HAOUARI 20 percentage germination (%) time of germination (day) 120 100 80 60 40 20 0 6 5 4 3 2 1 0 1 2 3 4 5 6 B 1 2 3 4 5 6 depth (cm) Figure 3 – Percentage of seed germination of Pennisetum dichotomum (A) and germination time (B) in response to depth values. be measured (Fig. 4C). Increasing NaCl concentration in the growth medium had a highly significant (p
Page 1 and 2: ecologia mediterranea Vol. 38 (2) -
Page 3 and 4: ecologia mediterranea Revue interna
Page 5 and 6: Pr Thierry DUTOIT Éditeur en chef
Page 7 and 8: SÉLIMA BERCHI, AMEL AOUATI, KAMEL
Page 19: CHIRAZ CHAFFEI HAOUARI, AFEF HAJJAJ
Page 23 and 24: CHIRAZ CHAFFEI HAOUARI, AFEF HAJJAJ
Page 25 and 26: CATERINA MAGRINI, MICHELE CENTO, EM
Page 27 and 28: CATERINA MAGRINI, MICHELE CENTO, EM
Page 29 and 30: Les communautés bryophytiques du l
Page 31 and 32: Du point de vue de la structure du
Page 33 and 34: ecologia mediterranea - Vol. 38 (2)
Page 35 and 36: Leptodictyo riparii-Fissidentetum c
Page 37 and 38: ait être assimilé en l’état à
Page 39 and 40: lent sur ces placages limoneux. Ain
Page 41 and 42: Meyran O., 1914. Catalogue des mous
Page 43 and 44: T. S. KSIKSI, N. O. ALSHAYGI 44 200
Page 45 and 46: T. S. KSIKSI, N. O. ALSHAYGI 46 Pig
Page 47 and 48: T. S. KSIKSI, N. O. ALSHAYGI 48 tre
Page 49 and 50: T. S. KSIKSI, N. O. ALSHAYGI 50 Roo
Page 51 and 52: Existing areas and past changes of
Page 53 and 54: Material and methods Area studied T
Page 55 and 56: zier 2004) wetland inventories. The
Page 57 and 58: Results Surface and number of exist
Page 59 and 60: Discussion Mediterranean wetlands:
Page 61 and 62: treated differently in each country
Page 63 and 64: DGF (Direction générale des forê
Page 65 and 66: Plant communities in the Tamanrasse
Page 67 and 68: elong to two major geomorphological
Page 69 and 70: The Rhus tripartita and Olea europa
Page 71 and 72:
Table 2 - The Cassia aschrek-Panicu
Page 73 and 74:
from sandy-silty, sandy to sandy-gr
Page 75 and 76:
complex ecological situation and th
Page 77 and 78:
Tamarix aphylla (Rudich & Danin 197
Page 79 and 80:
Towards the establishment of a natu
Page 81 and 82:
Introduction The structural complex
Page 83 and 84:
Methods Species richness The field
Page 85 and 86:
kurnet-es-sauda Eig.; Allium chlora
Page 87 and 88:
tidissima, and J. excelsa) and the
Page 89 and 90:
projects should abide strictly by t
Page 91 and 92:
Myers N., Mittermeier R.A., Mitterm
Page 93 and 94:
Micromeria graeca (L.) Benth. Micro
Page 95 and 96:
enlargement of this bioclimatic env
Page 97 and 98:
à grande échelle au sein du proje
Page 99 and 100:
at wood, bark and pith anatomy of t
Page 101 and 102:
ecologia mediterranea Editor-in-Chi
show all

Ecologia Mediterranea

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?