RT Journal Article
T1 Reproductive Biology of Olive Trees (Arbequina cultivar) at the Northern Limit of Their Distribution Areas
A1 Garrido, Alejandro
A1 Fernández González, María
A1 Vázquez Ruiz de Ocenda, Rosa Ana
A1 Rodríguez Rajo, Francisco Javier
A1 Aira Rodríguez, María Jesús
K1 Aerobiology
K1 Dormancy
K1 Olive
K1 Phenology
K1 Pollen
K1 Viability
K1 Germination
K1 Production
AB In recent years, North-western Spain has experienced an increase in the cultivated area of olive trees. The main propitious areas for olive groves are the Miño and Sil basins, as a consequence of their Oceanic climate with Mediterranean influence. The objective of this study is to determine the characteristics of reproductive biology, phenological and aerobiological behaviour of olive trees in the most northerly new plantation areas of the Iberian Peninsula. The study was carried out in an olive grove growing Olea europaea L. cv. ‘Arbequina’ located in Quiroga (Lugo) from 2016 to 2018. The phenological observations were based upon the main growth stages following the Biologische Bundesanstalt Bundessortenamt and Chemical industry (BBCH) scale. To predict the onset of flowering, a thermal time model was used in order to quantify the chill requirements, and growing degree-days were applied to determine the heat requirement. The production, viability and germination rates of Olea pollen were evaluated from samples selected in nine individual trees for the phenological survey. The aerobiological study was conducted by means of a Hirst-type pollen trap located in the centre of the olive grove. The vegetative period of the olive tree in the study area lasted an average of 259 days. The important phenological stage 6 (flowering) was the shortest stage. An average of 704 Chilling Hours (CH) with a threshold of 2.5 °C was required to overcome the chilling period, 1139 Growing Degree Days (GDD) for the beginning of flowering, and 4463 GDD for harvest. The pollen production per anther was 82589 grains (± 14084 pollen grains), with a rate of 81% viability and 12% pollen tube germination. The main pollen season started on average on May 20th and ended on June 16th with an average duration of 27 days and an annual pollen integral of 833 pollen grains. The low pollen concentrations could be a consequence of the Northern location of the forest, in a bioclimatic transition zone between the Eurosiberian and the Mediterranean areas, at the limit of olive tree distribution
PB MDPI
YR 2021
FD 2021
LK http://hdl.handle.net/10347/24428
UL http://hdl.handle.net/10347/24428
LA eng
NO Forests 2021, 12(2), 204; https://doi.org/10.3390/f12020204
NO This research was funded by the Xunta de Galicia (Consellería de Educación, Universidade e Formación Profesional) through the recognition as Grupo de Referencia Competitivo de Investigación (GRC GI-1809 BIOAPLIC “Biodiversidad y Botánica Aplicada”, ED431C 2019/07), the Agrupación Estratégica de Investigación BioReDes (ED431E 2018/09) and the BV1 Reference Competitive Research Groups ED431C 2017/62 (Xunta de Galicia, Spain). This work was partially funded by Xunta de Galicia CITACA “Cluster de Investigación y Transferencia Agroalimentaria de Campus del Agua” Strategic Partnership (Reference: ED431E 2018/07) and the AGL2014-60412-R Economy and Competence Ministry of Spain Government project
DS Minerva
RD 27 abr 2026