Artículos de revistas
Photosynthesis Is Induced In Rice Plants That Associate With Arbuscular Mycorrhizal Fungi And Are Grown Under Arsenate And Arsenite Stress
Registro en:
Photosynthesis Is Induced In Rice Plants That Associate With Arbuscular Mycorrhizal Fungi And Are Grown Under Arsenate And Arsenite Stress. Pergamon-elsevier Science Ltd, v. 134, p. 141-149 SEP-2015.
0045-6535
WOS:000356549500020
10.1016/j.chemosphere.2015.04.023
Autor
Lopez de Andrade
Sara Adrian; Domingues
Adilson Pereira
Jr.; Mazzafera
Paulo
Institución
Resumen
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) The metalloid arsenic (As) increases in agricultural soils because of anthropogenic activities and may have phytotoxic effects depending on the available concentrations. Plant performance can be improved by arbuscular mycorrhiza (AM) association under challenging conditions, such as those caused by excessive soil As levels. In this study, the influence of AM on CO2 assimilation, chlorophyll a fluorescence, SPAD-chlorophyll contents and plant growth was investigated in rice plants exposed to arsenate (MV) or arsenite (Ash!) and inoculated or not with Rhizophagus irregularis. Under AsV and Mill exposure, AM rice plants had greater biomass accumulation and relative chlorophyll content, increased water-use efficiency, higher carbon assimilation rate and higher stomatal conductance and transpiration rates than non-AM rice plants did. Chlorophyll a fluorescence analysis revealed significant differences in the response of AM-associated and -non-associated plants to As. Mycorrhization increased the maximum and actual quantum yields of photosystem II and the electron transport rate, maintaining higher values even under As exposure. Apart from the negative effects of MV and AsIII on the photosynthetic rates and PSI! efficiency in rice leaves, taken together, these results indicate that AM is able to sustain higher rice photosynthesis efficiency even under elevated As concentrations, especially when As is present as MV. (C) 2015 Elsevier Ltd. All rights reserved. 134
141 149 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) FAPESP [2011/18097-5]