Biological nitrogen fixation of Biserrula pelecinus L. under water deficit
2012
Vicente, C.S.L., University of Pablo de Olavide, Seville (Spain). Dept. of Physical, Chemical and Natural Systems | Perez-Fernandez, M.A., University of Pablo de Olavide, Seville (Spain). Dept. of Physical, Chemical and Natural Systems | Pereira, G., L-INIA-Elvas (Portugal). National Inst. of Biological Resources | Tavares-de-Sousa, M.M., L-INIA-Elvas (Portugal). National Inst. of Biological Resources
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, 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 N content of the aboveground biomass decreased with the increasing levels of drought stress, as well as nodulation and symbiotic N fixation, for all the tested isolates. The characteristics investigated suggested that SafPt12 was the most successful native rhizobia to withstand severe water conditions without compromising N fixation demands.
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