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Intact extraradical mycelium - a strategy for arbuscular mycorrhizal fungi in a...
Brito, Isabel; Carvalho, Mário; Alho, Luís; Caseiro, Mariline; Goss, Michael J.Arbuscular mycorrhiza are known to contribute to host plant P acquisition and protection against both biotic and abiotic stresses. However the practical exploitation of this mutualistic relationship is rarely considered in agricultural systems, allegedly owing to the cost of inoculation and the requirement for timely colonisation. AMF colonisation starting from an intact extra-radical mycelium (ERM) takes plac...
Practical exploitation of mycorrhizal fungi in agricultural systems
Brito, Isabel; Carvalho, Mário; Alho, Luís; Goss, Michael J.Improving the sustainability of agricultural systems requires a more efficacious use of soil resources. Mycorrhizas are known to contribute to host plant P acquisition and protection against both biotic and abiotic stresses, such as soil-borne diseases and toxic metal ions. However, practical exploitation of the mutualistic relationship is rarely considered in agricultural systems, allegedly owing to the cost o...
WEED MANAGEMENT UNDER NO-TILL TO INCREASE THE BENEFITS OF THE TRIPARTITE SYMBIOSIS
Alho, Luis; Carvalho, Mário; Goss, Michael; Brito, IsabelIn southern regions of Europe subclover (Trifolium subterraneum L.), inoculated with rhizobia, is commonly sown in acid soils that are marginal for arable crop production. The rate of success of these pastures is small both in terms of plant growth and nodulation with the introduced rhizobia. Manganese toxicity is frequently considered to be a contributory factor. Nevertheless, other native legumes, particularl...
Enhanced chickpea growth-promotion ability of a Mesorhizobium strain expressing...
Nascimento, Francisco; Brígido, Clarisse; Alho, Luís; Glick, Bernard; Oliveira, SolangeAims The main goal of the study reported herein was to assess the nodulation performance of a Mesorhizobium strain transformed with an exogenous ACC deaminase gene (acdS), and its subsequent ability to increase chickpea plant growth under normal and waterlogged conditions. Methods The Mesorhizobium ciceri strain LMS-1 was transformed with the acdS gene of Pseudomonas putida UW4 by triparental conjugation using...
Mesorhizobium ciceri LMS-1 expressing an exogenous 1-aminocyclopropane-1-carbox...
Nascimento, Francisco; Brígido, Clarisse; Glick, Bernard; Oliveira, Solange; Alho, LuísAims: Our goal was to understand the symbiotic behaviour of a Mesorhizobium strain expressing an exogenous 1-aminocyclopropane-1-carboxylate (ACC) deaminase, which was used as an inoculant of chickpea (Cicer arietinum) plants growing in soil. Methods and Results: Mesorhizobium ciceri LMS-1 (pRKACC) was tested for its plant growth promotion abilities on two chickpea cultivars (ELMO and CHK3226) growing in nonste...
NO-TILL PROVIDES THE OPPORTUNITY TO MANAGE UNDERGROUND INTERACTIONS BETWEEN ARB...
Brito, Isabel; Carvalho, Mário; Goss, Michael J.; Alho, LuísEarly colonization of crop roots by arbuscular mycorrhiza (AM) is considered beneficial but its importance likely depends on the possible stresses faced by the host plant. Manganese toxicity is one such stress that AM can alleviate. Colonization initiated by extraradical mycelium (ERM) is faster than other sources of inoculum. No-till creates the possibility of encouraging inoculation via this source. At seedin...
Comparison of chickpea rhizobia isolates from diverse Portuguese natural popula...
Laranjo, Marta; Branco, Cristina; Rebeca, Soares; Alho, Luís; Carvalho, Mário; Oliveira, SolangeAbstract: Aims: To test the hypothesis that differences in chickpea yields obtained in four distinct Portuguese regions (Beja, Elvas-Casas Velhas , Elvas-Estacao Nacional de Melhoramento de Plantas (ENMP) and Evora) could be due to variation between the natural rhizobia populations. Methods and Results: Estimation of the size of the different rhizobial populations showed that Elvas-ENMP population was the large...
Rhizobia of chickpea from southern Portugal: symbiotic efficiency and genetic d...
Laranjo, Marta; Rodrigues, Rute; Alho, Luís; Oliveira, SolangeAbstract: Aims: In order to evaluate differences between chickpea rhizobial populations from three geographical areas in southern Portugal (Beja, Elvas and Evora), isolates from the three regions were obtained and analysed. Methods and Results: The genetic characterization of the isolates was done by plasmid profiles and restriction analysis of the nif H gene. Symbiotic efficiency of the isolates was also deter...
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