Olea europaea
Detection of olive-infecting viruses in the Mediterranean basin
Sun, 2015-08-23 10:08 — Raed Alkowni
Journal Title, Volume, Page:
Proc. 4th IS on Olive Growing, Eds. C. Vitagliano & G.P. Martelli Acta Hort. 586, ISHS 2002
Year of Publication:
2002
Preferred Abstract (Original):
Olive
(Olea europaea) is host of 13 different viruses but, it is possible
that other viruses, which are either non mechanically transmissible or
occur in low concentration in plant tissues, are present in nature. This
likelihood is supported by the widespread occurrence of double-stranded
RNAs (dsRNAs) in plants negative to biological tests. As very little
information is available on the geographical distribution of
olive-infecting, investigations were conducted for gathering information
on the prevalence and distribution of olive viruses in the
Mediterranean basin based on the presence of double stranded RNA
(dsRNA). A total of 527 samples were collected throughout the surveys
covering 10 countries and 83 locations. Out of 286 tested samples
collected from 6 Italian regions, 210 (73.4%) were dsRNA positive,
whereas the average of viral infections in the Mediterranean basin was
64.5%. Molecular hybridisation tests, on 25 % of dsRNA-positive samples
collected in Apulia, revealed the presence of the three nepoviruses
(ArMV, CLRV and SLRSV), OLYaV and OLV-1.
Facebook
Google
LinkedIn
Twitter
Germination of 'Arabequina' Olive Seeds as Affected by Chemical Scarification, Hot Water Treatment and Endosperm Tissue
Mon, 2013-12-23 08:18 — Hassan Abu Qaoud
Journal Title, Volume, Page:
Jordan Journal of Agricultural Sciences, Vol 1, No 1
Year of Publication:
2005
Preferred Abstract (Original):
The effect of scarifying olive Olea europaea L. cv. Arabequina endocarp containing seeds (stony seeds) with H2SO4 and NaOH at two concentrations (0.1N and 1N) and two soaking periods (24 hrs and 48 hrs) as well as water for 24 and 48 hrs and hot water 50oC and 100oC for 24 and 84 hrs on their germination was investigated. To study the effect of the endosperm on seed germination, in vitro embryo culture of the same cultivar was performed. The germination potential of isolated embryos was compared to that of complete seeds and to sections of seeds including 2/3, 1/2, and 1/3 seed sections. The highest significantly germination percentage (60%) was obtained when the stone seeds were scarified with 0.1 N H2SO4 for 24 hrs after 115 days of planting. Treating the stony seeds with either H2SO4 for 24 hrs or water at 50o C and tap water for 24 and 48 hrs raised germination percentage over other treatments. Soaking the stony seeds with H2SO4 for 48 hrs improved germination percentage but with lower effect than H2SO4 for 24 hrs. The excised embryos and the 1/2 seed portion started to germinate after one week of culturing. The highest embryo germination percentage (70%) was recorded after one month of planting. Both 1/2 and 1/3 seed’s sections exhibited higher germination percentage than the germination of 2/3 seed section or whole seed. The results of this work indicated a pronounce effect of the endocarp and endosperm on olive seed germination.
The responsibility of all materials published at this website belongs to its authors.
