Arsenic-induced morphological variations and the role of phosphorus in alleviating arsenic toxicity in rice (Oryza sativa L.)

Md Saiful Islam, Md Motiur Rahman, Nishit Kumar Paul

Plant Science Archives 1(1), 1-10, 2016.


Primarily, this study was conducted to screen for As tolerant rice genotypes based on morpho-physiological features. Root length and root fresh weight significantly reduced in BRRI-39, BRRI-41 and BRRI-51 due to As treatment compared to controls excluding BRRI-33. Further, BRRI-33 did not show significant decrease in shoot height and shoot fresh weight due to As treatment; whereas these parameters were severely affected by same conditions in other genotypes. It does suggest that BRRI-33 is able to tolerate As and its growth parameters are not affected by As treatment. In contrast, BRRI-39, BRRI-41 and BRRI-51 are sensitive to As. Secondly, As and P supplementation significantly increased chlorophyll concentrations in BRRI-33, BRRI-44 and BRRI-51 but not in BRRI-39 compared to controls and As treated plants. Again, As and P treatment significantly increased the root and shoot dry weight in BRRI-33 and BRRI-44 compared to As treated plants. Finally, dual treatment of As and P significantly decreased the As concentration in leaves of BRRI-33, BRRI-44 and BRRI-51 but not in BRRI-39. It suggests that P is involved in alleviating As toxicity and inhibiting As uptake in leaves of rice. Among them, BRRI-33 is most efficient in utilizing P in alleviating As toxicity.