Antioxidant enzyme activities and dry matter of rice plant as affected by interactions of lead, phosphorus and zinc

Abstract

Nutrient management can be an effective approach to enhance plant antioxidant defense system under heavy metal toxicity. A greenhouse experiment was conducted to examine the effects of the two-and three-way interactions of lead (Pb), zinc (Zn) and phosphorus (P) on the activity of catalase (CAT), peroxidase (POD) and superoxide (SOD) enzymes and the total dry matter (TDM) of rice (Oryza sativa L. cv. Hashemi). This study was conducted as a factorial experiment in completely randomized design with three factors of Zn (0, 25 and 250 mg kg -1), P (0, 50 and 500 mg kg-1) and Pb (0, 200, 400 and 800 mg kg-1) and three replications in calcareous soil. CAT, POD and SOD activity in the fresh leaves and TDM of the rice plant were determined. The effects of two-and three-way interactions of P, Pb and Zn on the antioxidant enzymes activities and TDM of rice plant were significant, and the type interaction was dependent on the levels of these factors. Soil Pb contamination significantly increased the CAT, POD and SOD enzyme activity but resulted in decreased TDM of the rice plant. Application of 250 mg Zn per kg of soil significantly increased activity of CAT and POD enzymes and TDM at the Pb level of 800 mg kg-1. Phosphorus fertilization significantly increased CAT and POD activity and TDM under Zn-and Pb-contaminated conditions. To increase antioxidant enzyme activity and rice tolerance and growth in Pb-contaminated calcareous soils, combined application pf P and Zn at 500 and 250 mg per kg of soil, respectively, can be recommended under similar conditions.

Source or Periodical Title

The Philippine Agricultural Scientist

ISSN

0031-7454

Page

310-321

Document Type

Article

Frequency

quarterly

Physical Description

illustrations ; tables

Language

English

En – AGROVOC descriptors

ORYZA SATIVA; METALLIC ELEMENTS; DRY MATTER; DRY MATTER CONTENT; PHYTOTOXICITY; PLANT NUTRITION; NUTRIENT MANAGEMENT; ANTIOXIDANTS; HEAVY METALS; LEAD; ZINC; PHOSPHORUS; PEROXIDASES; CATALASE; ENZYMES; POLLUTANTS

This document is currently not available here.

Share

COinS