Effect of Silicon Spraying on Rice Photosynthesis and Antioxidant Defense System on Cadmium Accumulation

Overview

Journal Sci Rep

Specialty Science

Date 2024 Jul 3

PMID 38961133

Authors

Hongxing Chen

Xiaoyun Huang

Hui Chen

Song Zhang

Chengwu Fan

Tianling Fu

Tengbing He

Zhenran Gao

Affiliations

Soon will be listed here.

Abstract

Cadmium (Cd) pollution is a serious threat to food safety and human health. Minimizing Cd uptake and enhancing Cd tolerance in plants are vital to improve crop yield and reduce hazardous effects to humans. In this study, we designed three Cd concentration stress treatments (Cd1: 0.20 mg·kg, Cd2: 0.60 mg·kg, and Cd3: 1.60 mg·kg) and two foliar silicon (Si) treatments (CK: no spraying of any material, and Si: foliar Si spraying) to conduct pot experiments on soil Cd stress. The results showed that spraying Si on the leaves reduced the Cd content in brown rice by 4.79-42.14%. Si application increased net photosynthetic rate (Pn) by 1.77-4.08%, stomatal conductance (Gs) by 5.27-23.43%, transpiration rate (Tr) by 2.99-20.50% and intercellular carbon dioxide (CO) concentration (Ci) by 6.55-8.84%. Foliar spraying of Si significantly increased the activities of superoxide dismutase (SOD) and peroxidase (POD) in rice leaves by 9.84-14.09% and 4.69-53.09%, respectively, and reduced the content of malondialdehyde (MDA) by 7.83-48.72%. In summary, foliar Si spraying protects the photosynthesis and antioxidant system of rice canopy leaves, and is an effective method to reduce the Cd content in brown rice.

Citing Articles

An Overview of the Mechanisms through Which Plants Regulate ROS Homeostasis under Cadmium Stress.

Luo P, Wu J, Li T, Shi P, Ma Q, Di D Antioxidants (Basel). 2024; 13(10).

PMID: 39456428 PMC: 11505430. DOI: 10.3390/antiox13101174.

Comparing the Effects of Lime Soil and Yellow Soil on Cadmium Accumulation in Rice during Grain-Filling and Maturation Periods.

Wang H, Teng L, Mao X, He T, Fu T Plants (Basel). 2024; 13(15).

PMID: 39124137 PMC: 11313791. DOI: 10.3390/plants13152018.

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