Biological nitrogen fixation of Biserrula pelecinus L. under water deficit

C.S.L. Vicente, M.A. Pérez-Fernández, G. Pereira and M.M. Tavares- de-Sousa
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C.S.L. Vicente: Department of Physical, Chemical and Natural Systems, University of Pablo de Olavide, Seville, Spain
M.A. Pérez-Fernández: Department of Physical, Chemical and Natural Systems, University of Pablo de Olavide, Seville, Spain
G. Pereira: National Institute of Biological Resources, L-INIA-Elvas, Elvas, Portugal
M.M. Tavares- de-Sousa: National Institute of Biological Resources, L-INIA-Elvas, Elvas, Portugal

Plant, Soil and Environment, 2012, vol. 58, issue 8, 360-366

Abstract: The present work studied the effects of water deficiency conditions on the biological nitrogen fixation of three native rhizobia (SafPt12, SafPt6, and AjuPt16) isolated from Biserrula pelecinus L., and a reference strain Mesorhizobium ciceri biovar biserrulae. In terms of plant-water status, B. pelecinus showed typical signs of drought avoidance strategies such as reducing the aboveground development (i.e. reduction in leaf surface area and increase in root/shoot ratio) in detriment of a better developed root system. Dry-matter production and nitrogen content of the aboveground biomass decreased with the increasing levels of drought stress, as well as nodulation and symbiotic nitrogen fixation, for all the tested isolates. The parameters investigated suggested that SafPt12 was the most successful native rhizobia to withstand severe water conditions without compromising nitrogen fixation demands.

Keywords: drought; Mesorhizobium; 15N natural abundance; stress (search for similar items in EconPapers)
Date: 2012
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Persistent link: https://EconPapers.repec.org/RePEc:caa:jnlpse:v:58:y:2012:i:8:id:786-2011-pse

DOI: 10.17221/786/2011-PSE

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