| Texto completo | |
| Autor(es): |
Martins, Tamires Da Silva
;
Filho, Jose R. Magalhaes
;
Cruz, Larissa Prado
;
Machado, Daniela F. S. P.
;
Erismann, Norma M.
;
Gondim-Tomaz, Rose M. A.
;
Marchiori, Paulo E. R.
;
Silva, Andre L. B. O.
;
Machado, Eduardo Caruso
;
Ribeiro, Rafael Vasconcelos
Número total de Autores: 10
|
| Tipo de documento: | Artigo Científico |
| Fonte: | EXPERIMENTAL AGRICULTURE; v. 60, p. 18-pg., 2024-05-14. |
| Resumo | |
Sucrose yield in sugarcane is a complex process regulated by both environmental and endogenous factors. However, the metabolic balance driving vegetative growth and sucrose accumulation remains poorly understood. Herein, we carried out a comprehensive assessment of carbohydrate dynamics throughout the crop cycle in two sugarcane varieties varying in biomass production, evaluating the carbon metabolism in both leaves and stalks. Our data revealed that the decline in photosynthetic rates during sugarcane maturation is associated not only to accumulation of sugars in leaves but also due to stomatal and non-stomatal limitations. We found that metabolic processes in leaves and stalks were intrinsically linked. While IACSP94-2094 had higher stalk sucrose concentration than IACSP95-5000, this latter produced more biomass. Compared to IACSP95-5000, IACSP94-2094 showed higher sucrose phosphate synthase (SPS) activity in leaves and stalks, along with lower soluble acid invertase (SAI) activity in leaves during the maximum growth stage. Interestingly, IACSP94-2094 also exhibited higher stalk SPS activity and lower stalk SAI activity than IACSP95-5000 during maturation. High biomass production by IACSP95-5000 was associated with higher sucrose synthase (SuSy) and SAI activity in leaves and higher SuSy and soluble neutral invertase (SNI) activity in stalks when compared to IACSP94-2094 during the maximum growth. Despite the contrasting strategies, both varieties displayed similar total sucrose yield, a balance between sucrose concentration and biomass production. This phenomenon implies the presence of a compensatory mechanism in sugarcane, with high biomass production compensating low sucrose accumulation and vice versa. (AU) | |
| Processo FAPESP: | 14/12969-9 - "A comunicação raiz-parte aérea e os metabolismos de carbono e oxidativo afetam a tolerância de cultivares de cana-de-açúcar aos estresses abióticos?" |
| Beneficiário: | Daniela Favero São Pedro Machado |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |
| Processo FAPESP: | 22/09154-0 - Metabolismo de carbono e de nitrogênio em cana-de-açúcar e cana energia sob déficit hídrico e baixa temperatura |
| Beneficiário: | Tamires da Silva Martins |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |
| Processo FAPESP: | 08/57495-3 - Integrando características fisiológicas, morfológicas e anatômicas para entender o rendimento diferencial de sacarose em genótipos de cana-de-açúcar |
| Beneficiário: | Eduardo Caruso Machado |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa BIOEN - Temático |