Maize plants have different strategies to protect their developing seeds against cadmium toxicity

Autor(es)

Kato, Fabiana Hibary ^[1] ; Amaral Carvalho, Marcia Eugenia ^[1] ; Gaziola, Salete Aparecida ^[1] ; Azevedo, Ricardo Antunes ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Genet, ESALQ USP, Escola Super Agr Luiz de Queiroz, BR-13418900 Piracicaba, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: THEORETICAL AND EXPERIMENTAL PLANT PHYSIOLOGY; v. 32, n. 3 MAY 2020.
• Citações Web of Science: 0

Resumo

This work aimed to quantify the concentration of soluble amino acids, nitrogen (N) and Cd in the developing seeds of maize plants that were grown in Cd-contaminated soil from seed sowing to the reproductive stages. The specific activities and feedback inhibition properties of lysine (Lys) metabolic enzymes were also determined in developing seeds. The potential maize yield was depressed by Cd exposure. Cadmium concentration in plant organs followed the decreasing order: roots > stems = leaves > developing seeds (37.04, 1.95, 1.46 and 0.22 mg kg(-1)Cd, respectively). The relatively low Cd concentration in the remained developing seeds was a result from root- and ear-mediated reductions of the Cd translocation in plants. Plants under Cd exposure presented developing seeds with an increased N concentration (up to 7%) when compared to control plants. Furthermore, the level of soluble amino acids (particularly histidine, glycine, tyrosine, methionine, isoleucine and valine) was increased in the developing seeds of Cd-treated plants. In addition, changes in the feedback properties of dihydrodipicolinate synthase (DHDPS), an enzyme from lysine metabolism, were observed in developing seeds. In conclusion, the current study showed that maternal plant exposure to Cd can alter the concentration of soluble amino acids and the behavior of Lys metabolic enzymes in developing seeds. This study provided not only new information about the influence of the long-term Cd exposure on plants, but also data about protective plant strategies against Cd toxicity. (AU)

• Processo FAPESP: 09/54676-0 - Estresse oxidativo induzido por metais: novas abordagens
• Beneficiário: Ricardo Antunes de Azevedo
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 13/15217-5 - Abordagem integrada de parâmetros anatômicos, fisiológicos, bioquímicos e moleculares para o estudo de mecanismos de tolerância ao cádmio em acessos de tomateiro
• Beneficiário: Marcia Eugenia Amaral de Carvalho
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 12/23981-4 - Análise das possíveis alterações do metabolismo de lisina induzidas pelo cádmio em milho (Zea mays)
• Beneficiário: Fabiana Hibary Kato Belini
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 15/26640-1 - Estudo dos mecanismos de tolerância ao cádmio em acessos de tomateiros: abordagens moleculares
• Beneficiário: Marcia Eugenia Amaral de Carvalho
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado