Effects of Ni2+ toxicity on Hill reaction and membrane functionality in maize
Journal Title: Журнал ÑтреÑÑ-физиологии и биохимии - Year 2012, Vol 8, Issue 4
Abstract
Soil contamination with heavy metals has become a worldwide problem, leading to losses in agricultural yield and hazardous health effects as they enter the food chain . Nickel as an essential trace element, affect a number of biochemical and physiological processes in plants in toxic levels. The most common symptoms are chlorosis, and inhibited photosynthesis and respiration. Zea mays seeds were germinated and cultured on nutrient solution with nickel concentrations of 50-200 μmol for a period of two weeks. Studied physiological makers included photosynthetic pigments content, the rate of Hill reaction, K+ efflux and carbohydrate leakage from the roots to the external solution and cell death as a Ni-induced membrane damage. By increasing Ni concentration up to 100 μmol, the content of chlorophyll a increased, but decreased at 200 μmol Ni. No significant changes in chlorophyll b and carotinoids content observed.The rate of Hill reaction as an ability of chlorophyll a in the reaction center of PSII680 to split water, decreased by increasing Ni concentration. Different concentrations of nickel increased the K+ efflux and sugar leakage from roots to the culture and the cell death of root tips. The present results suggested that the disruption of photosynthesis by Ni cannot be attributed to any single factor and appears to result from its combined effects on chloroplast structure, chlorophyll content and photosynthetic protein complexes and treatment with different levels of nickel may induce structural damage and alterations in membrane properties by generation of reactive oxygen species.
Authors and Affiliations
Fatemeh Ghasemi, Reza Heidari, Rashid Jameii, Latifeh Purakbar
Keywords
Related Articles
- EP ID EP151017
- DOI -
- Views 92
- Downloads 0
Change in the Content of Salicylic Acid and in the Activities of Phenylalanine Ammonia-Lyase and Catalase in Wheat Seedling Roots Under the Effect of Azospirillum Lectins
We investigated the time course of changes in the endogenous content of salicylic acid, the ratio between the acid's free and bound forms, and changes in the activities of phenylalanine ammonia-lyase and catalase in whea...
Role of Root Exudates in Adaptative Reactions of Buckwheat Plants in Aluminium-acid Stress
Aliminium toxicity is major limiting factor of crop production in acidic soils. It is known that mechanisms of toxic effects of aluminium are differing in biochemical characters, research of aluminium toxicity complicate...
Effects of Photoperiod and Temperature on Energy Budgets and Endocrine Hormones Concentrations in Tupaia belangeri
Environmental cues play important roles in the regulation of an animal’s physiology and behavior. In the present study, we performed a factorial experiment (temperature/photoperiod) in which Tupaia belangeri was acclimat...
Correction of the Negative Effects of Moisture Stress by Iodine-containing Preparations During Incubation
A positive impact transovarial supply iodine-containing preparation on the physiological and biochemical profile and the quality of day-old chickens egg crossing «Shaver 2000», derived from eggs incubated at high humidit...
28-homobrassinolide Protects Photosynthetic Machinery in Indian mustard Under High Temperature Stress
High temperature is a serious threat to crop production. Brassinosteroids (BRs), a group of plant steroidal hormones, can reduce effects of abiotic stresses. The present study was aimed to study the potency of brassinost...