Articles
Perspectives in olive propagation by Azospirillum baldaniorum Sp245
Article number
1446_12
Pages
89 – 94
Language
English
Abstract
The employment of alternative rooting agents to be used in the agamic propagation of olive plants (Olea europaea L.) is currently encouraged, mainly in the organic nursery sector.
One method explores the potential effectiveness of plant growth promoting rhizobacteria (PGPR), such as the free-living soil bacteria Azospirillum baldaniorum Sp245, in stimulating processes related to the formation of adventitious roots.
This research had a two-fold objective: 1) to evaluate the efficacy of A. baldaniorum Sp245 in semi-hardwood olive cuttings of ‘Santa Caterina’ and ‘Leccino’ cultivars, known to be hard- and easy-to root, respectively; 2) to develop a protocol for the early quantification of histological events associated to the adventitious root formation.
Comparative analyses were compared with the use of indole-3-butyric acid (IBA), a synthetic auxin that is commonly used as root-promoting compound.
Macroscopically morphological determinations and microscopically anatomical observations of the basal portion of cuttings were periodically assessed.
The best results on rooting performances of ‘Santa Caterina’ cultivar were obtained when cuttings were treated with the bacterial suspension.
Indeed, an improvement of rooting ability, number of adventitious roots and mean root length was detected in comparison with IBA treatments.
Histological analyses on ‘Leccino’ showed that the main cellular changes, leading to the adventitious root formation, were similar between A. baldaniorum Sp245 and IBA. These results appear to be innovative and promising.
As alternative rooting agent, A. baldaniorum Sp245 could replace IBA in organic nursery systems.
The development of protocols for early diagnosis of rooting aptitude could promote the propagation success, the first step towards the implantation of new olive orchards or renovation of the existing ones.
One method explores the potential effectiveness of plant growth promoting rhizobacteria (PGPR), such as the free-living soil bacteria Azospirillum baldaniorum Sp245, in stimulating processes related to the formation of adventitious roots.
This research had a two-fold objective: 1) to evaluate the efficacy of A. baldaniorum Sp245 in semi-hardwood olive cuttings of ‘Santa Caterina’ and ‘Leccino’ cultivars, known to be hard- and easy-to root, respectively; 2) to develop a protocol for the early quantification of histological events associated to the adventitious root formation.
Comparative analyses were compared with the use of indole-3-butyric acid (IBA), a synthetic auxin that is commonly used as root-promoting compound.
Macroscopically morphological determinations and microscopically anatomical observations of the basal portion of cuttings were periodically assessed.
The best results on rooting performances of ‘Santa Caterina’ cultivar were obtained when cuttings were treated with the bacterial suspension.
Indeed, an improvement of rooting ability, number of adventitious roots and mean root length was detected in comparison with IBA treatments.
Histological analyses on ‘Leccino’ showed that the main cellular changes, leading to the adventitious root formation, were similar between A. baldaniorum Sp245 and IBA. These results appear to be innovative and promising.
As alternative rooting agent, A. baldaniorum Sp245 could replace IBA in organic nursery systems.
The development of protocols for early diagnosis of rooting aptitude could promote the propagation success, the first step towards the implantation of new olive orchards or renovation of the existing ones.
Publication
Authors
S. Bartolini, L. Pappalettere, A. Toffanin
Keywords
semi hard-wood cuttings, histology, hard- and easy-to root cultivars, PGPR, nursery
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