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Physiological and morphological responses of the root system of Indian mustard (Brassica juncea L. Czern.) and rapeseed (Brassica napus L.) to copper stress
被引:104
作者:
Feigl, Gabor
[1
]
Kumar, Devanand
[2
]
Lehotai, Nora
[1
]
Tugyi, Nora
[1
]
Molnar, Arpad
[1
]
Oerdoeg, Attila
[1
]
Szepesi, Agnes
[1
]
Gemes, Katalin
[1
]
Laskay, Gabor
[1
]
Erdei, Laszlo
[1
]
Kolbert, Zsuzsanna
[1
]
机构:
[1] Univ Szeged, Fac Sci & Informat, Dept Plant Biol, H-6726 Szeged, Hungary
[2] Assam Univ, Dept Life Sci & Bioinformat, Silchar 788011, Assam, India
基金:
匈牙利科学研究基金会;
关键词:
Brassica juncea;
Brassica napus;
Cell wall modifications;
Nitric oxide;
Reactive oxygen species;
Root morphology;
NITRIC-OXIDE;
ARABIDOPSIS-THALIANA;
HEAVY-METALS;
HYDROGEN-PEROXIDE;
LIGNIN DEPOSITION;
OXIDATIVE STRESS;
CADMIUM;
GROWTH;
EXCESS;
TOXICITY;
D O I:
10.1016/j.ecoenv.2013.04.029
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
Copper (Cu) is an essential microelement for growth and development, but in excess it can cause toxicity in plants. In this comparative study, the uptake and accumulation of Cu as well as the morphological and physiological responses of Indian mustard (Brassica juncea L. Czern.) and rapeseed (Brassica napus L.) roots to Cu treatment were investigated. The possible involvement of redox active molecules (reactive oxygen species and nitric oxide) and modification in cell wall structure associated with Cu-induced morphological responses were also studied. In short- and long-term treatments, B. juncea suffered more pronounced growth inhibition as compared with B. napus. In addition to the shortening of primary and lateral roots, the number and the density of the laterals were also decreased by Cu. Exposure to copper induced nitric oxide generation in the root tips and this event proved to be dependent on the duration of the exposure and on the plant species. In short- and long-term treatments, Indian mustard showed more significant activation of superoxide dismutase (SOD), inhibition of ascorbate peroxidase (APX) and oxidation of ascorbate (AsA) than B. napus. Moreover, H2O2-dependent lignification was also observed in the Cu-exposed plants. In longer term, significant AsA accumulation and callose deposition were observed, reflecting serious oxidative stress in B. juncea. Based on the morphological and physiological results, we conclude that rapeseed tolerates Cu excess better than Indian mustard. (C) 2013 Elsevier Inc. All rights reserved.
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页码:179 / 189
页数:11
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