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Comparative effects of salinity and water stress on photosynthesis, water relations and growth of Jatropha curcas plants
被引:128
作者:
Silva, E. N.
[1
]
Ribeiro, R. V.
[2
]
Ferreira-Silva, S. L.
[1
]
Viegas, R. A.
[3
]
Silveira, J. A. G.
[1
]
机构:
[1] Univ Fed Ceara, Dept Bioquim & Biol Mol, Lab Metab Plantas, BR-60455970 Fortaleza, Ceara, Brazil
[2] Inst Agron Campinas, Setor Fisiol Vegetal, Ctr Pesquisa & Desenvolvimento Ecofisiol & Biofis, BR-13012970 Sao Paulo, Brazil
[3] Univ Fed Campina Grande, Dept Engn Florestal UFPB, BR-58700970 Patos de Minas, Paraiba, Brazil
关键词:
Chlorophyll fluorescence;
Drought;
Gas exchange;
Physic nut;
Salt stress;
GAS-EXCHANGE;
CHLOROPHYLL FLUORESCENCE;
OSMOTIC ADJUSTMENT;
SUPEROXIDE-DISMUTASE;
ANTIOXIDANT ENZYMES;
ION ACCUMULATION;
DROUGHT-STRESS;
SALT STRESS;
ASSIMILATION;
TEMPERATURE;
D O I:
10.1016/j.jaridenv.2010.05.036
中图分类号:
Q14 [生态学(生物生态学)];
学科分类号:
071012 ;
0713 ;
摘要:
The aim of this study was to evaluate the physiological responses of physic nut (Jatropha curcas L.) plants exposed to water stress and salinity in order to elucidate some acclimatory mechanisms. Mild water and salt stresses were imposed by plant exposure to -0.22 MPa iso-osmotic solutions with PEG 6000 or NaCl 50 mM for 8 days. Stress recovery was evaluated under control conditions after three and eight days. PEG treatment caused higher reductions in Psi(W) and Psi(S), but both relative water content and succulence were not affected by the two stress treatments, compared to the control. The PEG-stressed plants suffered higher restrictions in leaf growth compared to the salt-stressed ones. Moreover, only the PEG treatment caused a pronounced effect on leaf membrane integrity. Both treatments caused similar impairment of the CO2 assimilation rate, but the PEG stressed plants showed higher restriction in stomatal conductance and transpiration. Although both stresses caused significant decreases on the leaf chlorophyll content, the photochemical activity was not affected. Since the plants subjected to mild water and salt stresses showed a rapid and almost complete recovery, these physiological alterations could represent a set of adaptive mechanisms employed by J. curcas to cope with these stressful conditions. (C) 2010 Elsevier Ltd. All rights reserved.
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页码:1130 / 1137
页数:8
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