| Texto completo | |
| Autor(es): |
Moura, Barbara B.
[1]
;
Hoshika, Yasutomo
[2]
;
Silveira, Neidiquele M.
[3]
;
Marcos, Fernanda C. C.
[1]
;
Machado, Eduardo C.
[3]
;
Paoletti, Elena
[2]
;
Ribeiro, Rafael V.
[1, 3]
Número total de Autores: 7
|
| Afiliação do(s) autor(es): | [1] Univ Campinas UNICAMP, Inst Biol, Dept Plant Biol, Campinas, SP - Brazil
[2] Natl Res Council CNR, Inst Sustainable Plant Protect IPSP, Via Madonna del Piano 10, I-50019 Sesto Fiorentino - Italy
[3] Agron Inst IAC, Ctr R&D Ecophysiol & Biophys, Lab Plant Physiol Coaracy M Franco, Campinas, SP - Brazil
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ENVIRONMENTAL AND EXPERIMENTAL BOTANY; v. 153, p. 72-79, SEP 2018. |
| Citações Web of Science: | 1 |
| Resumo | |
Biomass accumulation, physiological and biochemical responses of sugarcane to ozone (O-3) were evaluated in two genotypes (IACSP94-2094 and IACSP95-5000) in a realistic free-air O-3 exposure system. Our aims were to investigate the mechanisms involved in O-3 detoxification and verify whether such mechanisms are genotype dependent. Plants were exposed to ambient air (Amb.) and ambient air plus 40% increase in O-3 concentration (x1.4) for 90 days. Plants at x1.4 O-3 showed reductions in leaf gas exchange and biomass production with consistent differences between the genotypes. Photosynthesis of IACSP95-5000 was more sensitive to elevated 03 as compared to IACSP94-2094. As a primary response, IACSP94-2094 showed reductions in stomatal conductance due to elevated 03, thus avoiding oxidative stress and maintaining CO2 assimilation for longer. As a consequence, IACSP94-2094 produced more biomass, and stalks had more soluble sugar concentration than IACSP95-5000. Leaf concentrations of O-2(-) and H2O2 in plants exposed to x1.4 O-3 were not enhanced, with such unexpected result suggesting that sugarcane plants have an effective antioxidant system to avoid O-3-induced damage. In both genotypes, increases in ascorbate peroxidase activity was directly related to decreases in leaf H2O2 concentration. In IACSP94-2094, however, catalase pathway was also stimulated for detoxifying H2O2. We concluded that sugarcane sensitivity to O-3 is genotype-dependent and then it is possible to reduce the deleterious effects of high O-3 levels on sugarcane physiology and biomass production by growing tolerant genotypes in polluted areas. (AU) | |
| Processo FAPESP: | 14/23839-9 - Experimento de fumigação com O3 em cana de açúcar |
| Beneficiário: | Barbara Baesso Moura |
| Modalidade de apoio: | Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado |
| Processo FAPESP: | 14/13524-0 - Os efeitos do ozônio em cana-de-açúca |
| Beneficiário: | Barbara Baesso Moura |
| Modalidade de apoio: | Bolsas no Brasil - Pós-Doutorado |