Soil waterlogging associated with iron excess potentiates physiological damage to soybean leaves

Author(s)

Lapaz, Allan de Marcos ; Pereira Yoshida, Camila Hatsu ; Pereira Bogas, Carlos Leonardo ; de Camargos, Liliane Santos ; Monteiro de Figueiredo, Paulo Alexandre ; Aguilar, Jailson Vieira ; Lima, Ronaldo Cintra ; Tomaz, Rafael Simoes

• Document type: Journal article
• Source: NATIVA; v. 10, n. 3, p. 8-pg., 2022-05-01.

Abstract

Many plants are exposed to soil waterlogging, including soybean plants. Soil waterlogging exponentially increases the availability of iron (Fe) and causes O-2 depletion, which may result in excessive uptake of Fe and shortage of O-2 to the roots and also nodules in leguminous plants, resulting in overproduction of reactive oxygen species and lipid peroxidation. The present study aimed to evaluate physiological damage to soybean leaves at the second trifoliate (V2) stage when exposed to non-waterlogged and waterlogged soils and combined with one moderate and two toxic levels of Fe. Soybean plants were vulnerable to soil waterlogging at all Fe levels tested, presenting the highest values of malonaldehyde, hydrogen peroxide, and Fe accumulation in the shoot, which resulted in accentuated damage to gas exchange and chlorophyll content, consequently leading to lower shoot dry weight. In contrast, soybean plants cultivated under optimal water availability showed less damage caused by excess Fe, mainly at 125 mg dm(-3) Fe, since the traits of net photosynthetic rate, water use efficiency, instantaneous carboxylation efficiency, malonaldehyde, and shoot dry weight were not affected. (AU)

• FAPESP's process: 20/12421-4 - Use of species with high biomass production as potential phytoremediation agents in soils contaminated with boron, copper, iron, zinc and manganese
• Grantee: Liliane Santos de Camargos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/01498-6 - Evaluation of the phytoremediation potential of tropical legumes in soils contaminated with copper, boron and manganese
• Grantee: Liliane Santos de Camargos
• Support Opportunities: Regular Research Grants
• FAPESP's process: 18/17380-4 - Evaluation of soybean varieties physiological and agronomic traits under different iron concentrations and under ideal hydric conditions and waterlogging
• Grantee: Allan de Marcos Lapaz
• Support Opportunities: Scholarships in Brazil - Master