A Comparative Study on Effect of Arsenic on Thiolic Ligands and Phytochelatins in Contrasting Arsenic Accumulating Rice Genotypes

Main Article Content

Kiran Gupta
Amit Kumar
Pradyumna Kumar Singh
Sudhakar Srivastava
Sanjay Dwivedi
Rudra Deo Tripathi
Garima Awasthi
Mohammad Israil Ansari

Abstract

Arsenic (As) is a carcinogenic element present in the environment, hence, detrimental to biota. Rice due to highly expressed silicon
pathways accumulates As more than other cereals crops. Moreover, this cereal is the major staple diet of billions of people. The current
study was done to analyze the responses of two contrasting rice (Oryza sativa L.) genotypes [high As accumulating rice genotypes (HAARG)
and low As accumulating rice genotypes (LAARG)] in terms of thiol and phytochelatins (PCs) synthesis, during arsenate (AsV) and
arsenite (AsIII) exposure. AsV and AsIII moderated the thiolic pathway which was evident by different metabolite levels in two genotypes.
The synthesis of PCs and consequently the formation of PC-As complexes under As stress was more in HAARG than in LAARG. It may
be considered that the plants triggered synthesis, as well as, consumption pathway of thiols to counter As toxicity. However, elevated
concentration of AsV and AsIII caused disturbances of this balance resulting in phytotoxicity in HAARG even after the accumulation
of a higher level of PCs. In contrast, LAARG showed less up-regulation of PCs, however, it was adequate to combat relatively low As
concentrations. The results indicate that if the synthesis of thiols and PCs are stimulated to an optimum level, it helps rice plants tolerate
As toxicity effectively.

Article Details

How to Cite
1.
Gupta K, Kumar A, Singh P, Srivastava S, Dwivedi S, Tripathi R, Awasthi G, Ansari M. A Comparative Study on Effect of Arsenic on Thiolic Ligands and Phytochelatins in Contrasting Arsenic Accumulating Rice Genotypes. IJPE [Internet]. 30Apr.2020 [cited 14May2021];6(02):110-7. Available from: https://ijplantenviro.com/index.php/IJPE/article/view/1279
Section
Review Article

Most read articles by the same author(s)