| Texto completo | |
| Autor(es): |
de Araujo, Maycon Anderson
;
de Melo, Andressa Aparecida Rodrigues
;
Silva, Vinicius Martins
;
dos Reis, Andre Rodrigues
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | Plant Physiology and Biochemistry; v. 201, p. 10-pg., 2023-06-08. |
| Resumo | |
Selenium (Se) beneficial effect on plants is related to an increase in nitrogen (N) assimilation and its role as an abiotic stress mitigator by reactive oxygen species (ROS) scavenging enhanced by antioxidant metabolism. This study aimed to evaluate sugarcane (Saccharum spp.) growth, photosynthetic and antioxidant responses, and sugar accumulation in response to Se supply. The experimental design was a factorial scheme 2 x 4: two sug-arcane varieties (RB96 6928 and RB86 7515) and four Se application rates (0; 5; 10 and 20 & mu;mol L-1) applied as sodium selenate in the nutrient solution. Leaf Se concentration increased under Se application in both varieties. The enzymes SOD (EC 1.15.1.1) and APX (EC 1.11.1.11) showed increase activities under Se application on variety RB96 6928. Nitrate reductase activity increased in both varieties resulting in the conversion of nitrate into higher total amino acids concentration indicating an enhanced N assimilation. This led to an increased concentration of chlorophylls and carotenoids, increased CO2 assimilation rate, stomatal conductance, and in-ternal CO2 concentration. Selenium provided higher starch accumulation and sugar profiles in leaves boosting plant growth. This study shows valuable information regarding the role of Se on growth, photosynthetic process, and sugar accumulation in sugarcane leaves, which could be used for further field experiments. The application rate of 10 & mu;mol Se L-1 was the most adequate for both varieties studied considering the sugar concentration and plant growth. (AU) | |
| Processo FAPESP: | 20/06461-3 - Respostas fisiológicas e bioquímicas envolvidas no metabolismo de nitrogênio e açúcares em variedades de cana-de-açúcar fertilizadas com selênio |
| Beneficiário: | Maycon Anderson de Araujo |
| Modalidade de apoio: | Bolsas no Brasil - Mestrado |