Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.14/15350
Título: Impact of bacterial inoculation of Quercus suber on mycorrhization by Suillus species at early stages of tree development
Autor: Ramos, Miguel A.
Sousa, Nadine R.
Franco, Albina R.
Dundar, Gonul
Oliveira, Rui S.
Castro, Paula M. L.
Palavras-chave: ectomycorrhizal fungi
plant growth promoting bacteria
dual inoculation
Quercus suber
Data: 1-Set-2013
Citação: RAMOS, Miguel A. - Impact of bacterial inoculation of Quercus suber on mycorrhization by Suillus species at early stages of tree development. In 7th EPSO Conference "Plants for a Greening Economy", Porto Heli, Greece, 1-4 September 2013.
Resumo: Portugal accounts for approximately 50% of the world cork production. Quercus suber is the second most abundant tree in Continental Portugal, covering currently 737 thousand hectares and representing 23% of the forest area. This species is of paramount importance to the country both ecologically and economically. As many other forest species, Q. suber forms symbiotic associations with ectomycorrhizal (ECM) fungi with the hyphae acting as fine extensions of the plant root system allowing it to capture water and nutrients in exchange for photosynthetic carbohydrates. The use of bacteria as inoculum also has great potential in forestry, whether through their capability to act as plant growth promoters (PGPB) or/and as mycohhizal helper bacteria (MHB). The latter have a direct impact in promoting fungal symbiosis and could possibly represent the third link in the mycorrhizal partnership. However, the association between all vertices of the triangle (plant-fungi-bacteria) is highly specific and needs to be further explored when aiming at the use of microbial inocula in the tuning of mycorrhization at nursery stage. The aim of this work was to study the impact of inoculating Q. suber with a fungus belonging to the genus Suillus and a bacterial strain belonging to the genus Mesorhizobium, proven to be PGPB in preliminary studies. The experiment was conducted in a forest nursery in Amarante. After 9 months, the impact of inoculating with each microorganism individually was compared to that of the use of the combined inoculum. Biometric parameters were determined (shoot height, primary and secondary root length, shoot and root dry weight) and mycorrhizal parameters were assessed (percentage of ECM colonisation and expansion rate). The presence of selected phytohormones was also determined by HPLC. Overall, inoculated plants had a superior performance than the non-inoculated controls, in the majority of the parameters studied. The use of the combined inoculum was more successful than any other treatment in promoting shoot height and led to the highest concentration of indoleacetic acid (IAA). The results obtained suggest that the use of bacteria in the mycorrhization of Q. suber may positively affect plant in its early stage of development.
URI: http://hdl.handle.net/10400.14/15350
Aparece nas colecções:CBQF - Resumos em actas / Abstracts in proceedings

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