Photosynthesizing on metal excess: Copper differently induced changes in various photosynthetic parameters in copper tolerant and sensitive Silene paradoxa L. populations

被引:48
作者
Bazihizina, Nadia [1 ]
Cozi, Ilaria [2 ]
Giorni, Elisabetta [2 ]
Mancuso, Stefano [1 ]
Gonnelli, Cristina [2 ]
机构
[1] Univ Firenze, Dept Agri Food & Environm Sci, I-50019 Florence, Italy
[2] Univ Firenze, Dept Biol, I-50121 Florence, Italy
关键词
Copper; Gas exchange; Photosynthesis; Pigments; Silene paradoxa; MESOPHYLL CONDUCTANCE; INDUCED INHIBITION; PHOTOSYSTEM-II; PHYSIOLOGICAL-RESPONSES; NONSTOMATAL LIMITATIONS; C-3; PLANTS; CELL-WALL; CO2; ACCUMULATION; DROUGHT;
D O I
10.1016/j.plantsci.2014.12.015
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
This work investigated Cu-induced changes in photosynthetic activity in contrasting populations of Silene paradoxa L. A metallicolous Cu-tolerant population and a non-metallicolous sensitive population were grown in hydroponics and exposed to different CuSO4 treatments for different times. Copper accumulation, MDA concentrations, and several photosynthetic parameters were measured to assess different effects of Cu exposure on plants from the two populations. A more efficient ability to photosynthesize in the presence of Cu excess was showed by the Cu-tolerant population with respect to the sensitive one. Interestingly, Cu-imposed limitations were present not only at a different degree, but also of different nature in the two populations. In the tolerant population, the most limiting factor to photosynthesis seemed to be Cu-imposed stomatal closure, whereas Cu-mediated biochemical limitation was scarce and Cu-mediated reduction in mesophyll conductance almost non-existent. In the sensitive population, Cu largely affected all the measured parameters, so that its photosynthetic activity experienced any kind of limitation, diffusional and especially biochemical. The lower Cu concentrations accumulated in the tolerant plant could be one of the factors concurring to the reported differences in photosynthetic activity, but also a higher capacity of internal detoxification and compartmentalization of the metal could not be excluded. (C) 2014 Elsevier Ireland Ltd. All rights reserved.
引用
收藏
页码:67 / 76
页数:10
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