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Changes in the salinity tolerance of sweet pepper plants as affected by nitrogen form and high CO2 concentration.
- Source :
-
Journal of Plant Physiology . Aug2016, Vol. 200, p18-27. 10p. - Publication Year :
- 2016
-
Abstract
- The assimilation and availability of nitrogen in its different forms can significantly affect the response of primary productivity under the current atmospheric alteration and soil degradation. An elevated CO 2 concentration (e[CO 2 ]) triggers changes in the efficiency and efficacy of photosynthetic processes, water use and product yield, the plant response to stress being altered with respect to ambient CO 2 conditions (a[CO 2 ]). Additionally, NH 4 + has been related to improved plant responses to stress, considering both energy efficiency in N-assimilation and the overcoming of the inhibition of photorespiration at e[CO 2 ]. Therefore, the aim of this work was to determine the response of sweet pepper plants ( Capsicum annuum L.) receiving an additional supply of NH 4 + (90/10 NO 3 − /NH 4 + ) to salinity stress (60 mM NaCl) under a[CO 2 ] (400 μmol mol −1 ) or e[CO 2 ] (800 μmol mol −1 ). Salt-stressed plants grown at e[CO 2 ] showed DW accumulation similar to that of the non-stressed plants at a[CO 2 ]. The supply of NH 4 + reduced growth at e[CO 2 ] when salinity was imposed. Moreover, NH 4 + differentially affected the stomatal conductance and water use efficiency and the leaf Cl − , K + , and Na + concentrations, but the extent of the effects was influenced by the [CO 2 ]. An antioxidant-related response was prompted by salinity, the total phenolics and proline concentrations being reduced by NH 4 + at e[CO 2 ]. Our results show that the effect of NH 4 + on plant salinity tolerance should be globally re-evaluated as e[CO 2 ] can significantly alter the response, when compared with previous studies at a[CO 2 ]. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 01761617
- Volume :
- 200
- Database :
- Academic Search Index
- Journal :
- Journal of Plant Physiology
- Publication Type :
- Academic Journal
- Accession number :
- 117096346
- Full Text :
- https://doi.org/10.1016/j.jplph.2016.05.020