Influence of salt stress on ecophysiological parameters of Periploca sepium bunge

Abstract

An experiment was carried out to investigate the effect of salt stress on Periploca sepium Bunge seedlings using three levels of salinity, 50 mmol/L, 100 mmol/L, and 200 mmol/L sodium chloride (NaCl) solution. The results showed that growth parameters and net photosynthetic rate (P<sub>n</sub>), stomatal conductance (G<sub>s</sub>) of Periploca sepium Bunge were enhanced under low salinity levels (50 mmol/L NaCl), which reduced strongly with increasing salinity levels. Under 100 mmol/L NaCl and 200 mmol/L NaCl stress, the decline of P<sub>n</sub> was mainly caused by non-stomatal factors. The water use efficiency (WUE), apparent light use efficiency (LUE), carboxylation efficiency (CUE) were enhanced under low salinity levels (50 mmol/L NaCl), the maximum value of WUE was observed at 100 mmol/L NaCl, the minimum value of WUE was observed at 200 mmol/L NaCl, the LUE, CUE were reduced by 52% and 47%, at 200 mmol/L NaCl, respectively, compared to control. Activities of the antioxidative enzymes superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were enhanced by low salinity treatment (50 mmol/L NaCl), but CAT activity decreased at 200 mmol/L NaCl stress. Malondialdehyde (MDA) was non-significant compared to the control under low salinity levels (50 mmol/L NaCl), the maximum value was observed at 200 mmol/L NaCl. These results suggest a possibility to improve saline soil utilization of Periploca sepium Bunge in Yellow River Delta region.

Application of nanomaterial graphene oxide on biochemical traits of Milk thistle (Silybum marianum L.) under salinity stress

“…The reduction in plant growth under salinity stress is explained by adverse impacts of extreme salinity on the ion homeostasis, water balance, mineral nutrition and photosynthetic carbon metabolism (Zhu 2001;Yusuf et al, 2007). Reduction in plant growth due to salinity was reported in previous studies on Rice (Nemati et al, 2011;Nounjan and Theerakulpisut, 2012), Barley (Ali et al, 2011), and Periploca sepium (Sun et al, 2011). The advantage of the low concentration of GO in our result can be explained by its effects on improving the Indole-3-acetic acid (IAA) biosynthesis and concentration, as well as promoting the root growth and elongation in plant (Cheng et al, 2016).…”

Salt stress manifestation on plants, mechanism of salt tolerance and potassium role in alleviating it: a review

“…Salinity is an agroenvironmental problem limiting plant growth and development in the arid and semi-arid regions of the world (Ashraf, 2004). Salinity stress reduces relative growth rate, net photosynthetic rate, net assimilation rate and alters biomass production (Akram et al, 2011;Sun et al, 2011). Kabir et al (2004) reported that salinity reduced total dry matter of plants which ultimately caused reduction in crop yield but application of potassium improved growth and biomass yield of barley and bean under saline conditions (Mahmood, 2011;Dawood et al, 2014).…”

“…Plants exposed to environmental stress factors, such as salinity, drought, high light intensity and nutrient limitations, suffer from oxidative damage catalyzed by reactive oxygen species (ROS), e.g., super oxide, hydrogen peroxide and hydroxyl radical, ion toxicity and K-deficiency. Salt tolerant genotypes respond to salinity by increasing anti-oxidative defense systems for detoxification of ROS (Zhu, 2001;Ali et al, 2011;Sun et al, 2011).…”

“…The effects of salt stress are associated with low osmotic potential of soil solution resulting in water stress, nutritional imbalance, specific ion effect and any combination of these factors (Evelin et al, 2009). Salt stress may cause membrane disorganization, generation of toxic metabolites, inhibition of photosynthesis, generation of ROS and attenuated nutrient acquisition leading to cell and whole plant death (Hasegawa et al, 2000;Ashraf, 2004;Chartzoulakis, Psarras, 2005;Sun et al, 2011). Considerable progress in salinity tolerance has been made through conventional breeding methods (Ashraf, 2002).…”

Morpho-Physiological Response of Stevia (Stevia Rebaudiana Bertoni) to Salinity Under Hydroponic Culture Condition (A Case Study in Iran)

“…Safwat et al (2016) reported that salinity decreased root number and length in stevia. The RFW and RDW in Periploca sepium Bunge were reduced strongly with increasing salinity levels (Sun et al, 2011). Researchers mentioned the reduction of photosynthesis, degradation of cell membranes, reduction water availability to roots and accumulation of sodium ions as the main factors reduce plant growth under salt stress (Sharifi et al, 2007 The salinity stress an important subject is the generation of excessive ROS which caused membrane destruction, cell toxicity, and cell death (Chookhampaeng et al, 2008).…”