Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 162, Issue -, Pages 171-184Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2021.02.043
Keywords
Humic substances; Structural characterization; Mode of action; Bioactivity
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Funding
- Pos-Graduate Program in Agronomy - Soil Science at the Federal Rural University of Rio de Janeiro (PPGACS, UFRRJ)
- Fundacao de Amparo a Pesquisa do Estado do Rio de Janeiro - Brazil [SisFAPERJ: 2012028010]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico - Brazil [306867/2018-4, 09/2018]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior - Brazil [CAPES: 001]
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Chemical eustressors, such as humic acids (HA), have the potential to induce a positive stress state in plants, improving growth and resistance. Different structural characteristics of HA can lead to varying effects on photosynthesis regulation in rice plants. Understanding the interactions between HA and plants is crucial for optimizing growth and stress response.
Chemical eustressors induce a eustress state positive stress increasing the resistance and improve the plant growth. The potentiality of humic acids (HA) to act as a eustressor has been scarcely explored. The present study aims to evaluate how HA with different structural characteristics induce differently, a eustress state in rice plants through the regulation of photosynthesis. The photosynthetic performance index showed an initial eustress state in plant by HA application characterized by reduction in photosynthesis followed by an increase in photosynthetic efficiency. The HA as a chemical eustressor triggering changes in plant metabolism indicate that the interaction of HA with root system induces a roots growth stimulus preceded by an initial positive stress. The eustress caused by HA is differentiated and is related to its chemical-physics characteristics. The HAVC, with a predominance of C-Alkyl-(O,N), C-Alkyl-di-O, C-Aromatic-O structures and greater polarity, stimulated the accumulation of N-NO3- and of soluble sugars in the sheath, increase carbohydrates content in the root and the root emission, resulting in higher total biomass production. The HASOIL, with a predominance of C-COOH-(H,R), C-Alkyl-O, C-Aromatic-H,R structures and greater hydrophobicity caused a decrease in N-NH4+ and N-amine. The HARN, with a predominance of C-Alkyl-O, C-Alkyl-H,R, and C=O, characterized by average polarity, caused an increase in photosynthetic pigment and N-NH4+ content. These results are keys to understand that quality of soil organic matter is related to plant development and that HA are efficient proxies for elucidate its function in natural environments.
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