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- Amine, E. (1)
- Bassem, K. (1)
- Fakhfakh, H. (1)
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- Zayneb, C. (1)
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Gharsallah, C.; Fakhfakh, H.; Grubb, D.; Gorsane, F. Effect of salt stress on ion concentration, proline content, antioxidant enzyme activities and gene expression in tomato cultivars AoB PLANTS 8, plw055, (2016) DOI: 10.1093/aobpla/plw055
Salinity is a constraint limiting plant growth
and productivity of crops throughout the world. Understanding the
mechanism underlying plant response to salinity provides new insights
into the improvement of salt tolerance-crops of importance. In the
present study, we report on the responses of twenty cultivars of tomato.
We have clustered genotypes into scale classes according to their
response to increased NaCl levels. Three local tomato genotypes,
representative of different saline scale classes, were selected for
further investigation. During early (0 h, 6 h and 12 h) and later (7
days) stages of the response to salt treatment, ion concentrations (Na +
, K + and Ca 2+ ), proline content, enzyme activities (catalase,
ascorbate peroxidase and guiacol peroxidase) were recorded. qPCR
analysis of candidate genes WRKY (8, 31and 39), ERF (9, 16 and 80),
LeNHX (1, 3 and 4) and HKT (class I) were performed. A high K + , Ca 2 +
and proline accumulation as well as a decrease of Na +
concentration-mediated salt tolerance. Concomitant with a pattern of
high-antioxidant enzyme activities, tolerant genotypes also displayed
differential patterns of gene expression during the response to salt
stress.
Zayneb, C.; Lamia, K.; Olfa, E.; Naïma, J.; Grubb, C. D.; Bassem, K.; Hafedh, M.; Amine, E. Morphological, Physiological and Biochemical Impact of Ink Industry Effluent on Germination of Maize (Zea mays), Barley (Hordeum vulgare) and Sorghum (Sorghum bicolor) Bull Environ Contam Toxicol 95, 687-693, (2015) DOI: 10.1007/s00128-015-1600-y
The present study focuses on effects of
untreated and treated ink industry wastewater on germination of maize,
barley and sorghum. Wastewater had a high chemical oxygen demand (COD)
and metal content compared to treated effluent. Germination decreased
with increasing COD concentration. Speed of germination also followed
the same trend, except for maize seeds exposed to untreated effluent
(E), which germinated slightly faster than controls. These alterations
of seedling development were mirrored by changes in soluble protein
content. E exerted a positive effect on soluble protein content and
maximum levels occurred after 10 days with treated effluent using
coagulation/flocculation (TEc/f) process and treated effluent using
combined process (coagulation/flocculation/biosorption) (TEc/f/b).
Likewise, activity of α-amylase was influenced by effluent composition.
Its expression depended on the species, exposure time and applied
treatment. Nevertheless, current results indicated TEc/f/b had no
observable toxic effects on germination and could be a beneficial
alternative resource to irrigation water.