Silicon alleviates nickel toxicity in cotton seedlings through enhancing growth, photosynthesis, and suppressing Ni uptake and oxidative stress

Abstract

2015): Silicon alleviates nickel toxicity in cotton seedlings through enhancing growth, photosynthesis and suppressing Ni uptake and oxidative stress Silicon alleviates nickel toxicity in cotton, Archives of Agronomy and Soil Science To link to this article: http://dx. AbstractCotton (Gossypium hirsutum L.) is a well-known and economically most beneficial crop worldwide while nickel (Ni) toxicity is widespread problem in crops grown on Nicontaminated soils. We investigated the response of silicon (Si) in cotton under Ni stress with respect to growth, biomass, gas exchange attributes, enzymatic activities and Ni uptake and accumulation. For this, plants were grown in hydroponics for 12 weeks with three levels of Ni (0, 50 and 100 µM) in the presence or absence of 1 mM Si. Results showed that Ni Downloaded by [University of Otago] at 22:57 24 July 2015 A c c e p t e d M a n u s c r i p t significantly reduced the plant growth, biomass, gas exchange attributes and pigment contents while Si application mitigated these adverse effects under Ni stress. Nickel stress significantly decreased antioxidant enzymes activities while increased malondialdehyde (MDA), hydrogen peroxide (H 2 O 2 ) and electrolyte leakage (EC) in leaves and roots. The application of Si enhanced the activities of antioxidant enzymes and reduced MDA, H 2 O 2 and EC in plants.Nickel application significantly increased Ni concentration and accumulation in leaf, stem and roots while Si application significantly decreased Ni in these plant parts. The present study indicates that Si could improve cotton growth under Ni stress by lowering Ni uptake and reactive oxygen species (ROS) and by increasing antioxidant enzymes activities.

Effect of different amendments on rice (Oryza sativa L.) growth, yield, nutrient uptake and grain quality in Ni-contaminated soil

“…Soil pH was manipulated from 8 to 6.5 with elemental sulfur prior to sowing of rice crop. Values are means with bars sharing the same letters which are statistically similar to each other at p ≤ 0.05 many plant species (Ouzounidou et al 2006;Khaliq et al 2016). Similarly, a decrease in stomatal conductance and hence a decline in photosynthesis due to Ni stress in poplar (Populus nigra) were reported by Velikova et al (2010).…”

“…Among heavy metals, contamination of soil with nickel (Ni) has become a serious global issue, leading to hazardous health effects as they enter the food chain and cause reduction in agricultural yield (Guo and Marschner 1995;Salt et al 1995;Khaliq et al 2016). Nickel is released into the atmosphere from both natural and anthropogenic sources (Rajkumar and Freitas 2008).…”

“…Nickel is considered an essential micronutrient for proper functioning of plants, and its high concentration in soil caused toxic effects on plants grown in these soils (Roitto et al 2005;Gajewska et al 2009). Excess Ni affects a number of biochemical and physiological processes in plants resulting in an inhibition of plant growth and yield (Bertrand et al 2001;Gajewska et al 2006;Khaliq et al 2016).…”

Measurement of Different Heavy Metals Concentration in Roadside Dust in the Vicinity of Gujrat, Pakistan

“…This constant increase in number of automobiles lead to more traffic load on roads and cause traffic jams due to which more pollutants released into the atmosphere. The seasonal changes affect the contamination of heavy metals in road dust such as, heavy metal concentration is more in normal to dry season, while in rainy season these spread/thresh away along with water and diluted [33,25].…”

“…(2011) atmospheric dispersion and frequently brake use were additional factors in nickel contamination [13]. Nickel moves along with food web by bio-accumulation and bio-magnification that cause several diseases such as skin allergy, lung and cardiovascular diseases [10,25].…”