Photosynthesis is induced in rice plants that associate with arbuscular mycorrhizal fungi and are grown under arsenate and arsenite stress

被引:64
作者
Lopez de Andrade, Sara Adrian [1 ]
Domingues, Adilson Pereira, Jr. [1 ]
Mazzafera, Paulo [1 ]
机构
[1] Univ Estadual Campinas, Inst Biol, Dept Biol Vegetal, Campinas, SP, Brazil
基金
巴西圣保罗研究基金会;
关键词
Arbuscular mycorrhiza; Arsenic; Chlorophyll fluorescence; Photochemical metabolism; Rhizophagus irregularis; ACCUMULATION; CHLOROPHYLL; TOLERANCE; TRANSPORTERS; METABOLISM; TOXICITY; ROOTS; YIELD;
D O I
10.1016/j.chemosphere.2015.04.023
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.
引用
收藏
页码:141 / 149
页数:9
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