Open AccessResponse of soybean to soil waterlogging associated with iron excess in the reproductive stage
Author(s) -
Allan de Marcos Lapaz,
Liliane Santos de Camargos,
Camila Hatsu Pereira Yoshida,
Ana Carolina Firmino,
Paulo Alexandre Monteiro de Figueiredo,
Jailson Vieira Aguilar,
Artur Bernardeli Nicolai,
Wesller da Silva de Paiva,
Victor Hugo Cruz,
Rafael Simões Tomaz
Publication year - 2020
Publication title -
physiology and molecular biology of plants/physiology and molecular biology of plants
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.754
H-Index - 35
eISSN - 0971-5894
pISSN - 0974-0430
DOI - 10.1007/s12298-020-00845-8
Subject(s) - waterlogging (archaeology) , photosynthesis , agronomy , soil water , plant physiology , chemistry , horticulture , biology , botany , ecology , wetland
Soil waterlogging is a common problem in some agricultural areas, including regions under soybean ( Glycine max ) cultivation. In waterlogged soils, soil O 2 depletion occurs due to aerobic microorganisms and plants, affecting the metabolic and physiological processes of plants after suffering anoxia in their root tissue. Another harmful factor in this situation is the exponential increase in the availability of iron (Fe) in the soil, which may result in absorption of excess Fe. The present study sought to evaluate the response mechanisms in soybean leaves 'Agroeste 3680' by physiological and biochemical analyses associating them with the development of pods in non-waterlogged and waterlogged soil, combined with one moderate and two toxic levels of Fe. Gas exchange was strongly affected by soil waterlogging. Excess Fe without soil waterlogging reduced photosynthetic pigments, and potentiated this reduction when associated with soil waterlogging. Starch and ureide accumulation in the first newly expanded trifoliate leaves proved to be response mechanisms induced by soil waterlogging and excess Fe, since plants cultivated under soil non-waterlogged soil at 25 mg dm -3 Fe showed lower contents when compared to stressed plants. Thus, starch and ureide accumulation could be considered efficient biomarkers of phytotoxicity caused by soil waterlogging and excess Fe in soybean plants. The reproductive development was abruptly interrupted by the imposition of stresses, leading to a loss of pod dry biomass, which was largely due to the substantial decrease in the net photosynthetic rate, as expressed by area ( A ), the blockage of carbohydrate transport to sink tissues and an increase of malondialdehyde (MDA). The negative effect on reproductive development was more pronounced under waterlogged soil.