Elevated CO2 atmosphere promotes plant growth and inulin production in the cerrado species Vernonia herbacea

Autor(es)

Oliveira, Vanessa F. ^[1] ; Zaidan, Lilian B. P. ^[1] ; Braga, Marcia R. ^[1] ; Aidar, Marcos P. M. ^[1] ; Carvalho, Maria Angela M. ^[1]

Afiliação do(s) autor(es)

^[1] Inst Bot, Secao Fisiol & Bioquim Plantas, BR-01061970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FUNCTIONAL PLANT BIOLOGY; v. 37, n. 3, p. 223-231, 2010.
• Citações Web of Science: 26

Resumo

Carbon allocation in biomass is an important response of plants to the increasing atmospheric {[}CO(2)]. The effects of elevated {[}CO(2)] are scarcely reported in fructan-accumulating plants and even less in tropical wild species storing this type of carbohydrate. In the present study, the effects of high {[}CO(2)] atmosphere was evaluated on growth, biomass allocation and fructan metabolism in Vernonia herbacea (Vell.) Rusby, an Asteraceae from the Brazilian cerrado, which accumulates inulin-type fructans in the underground organs (rhizophores). Plants were cultivated for 120 days in open-top chambers (OTCs) under ambient (similar to 380 mu mol mol(-1)), and elevated (similar to 760 mu mol mol(-1)) {[}CO(2)]. Plant growth, photosynthesis, fructan contents, and the activities of fructan metabolising enzymes were analysed in the rhizophores at Time 0 and 15, 30, 60, 90 and 120 days. Plants under elevated {[}CO(2)] presented increases in height (40%), photosynthesis (63%) and biomass of aerial (32%) and underground (47%) organs when compared with control plants. Under elevated {[}CO(2)] plants also presented higher 1-SST, 1-FFT and invertase activities and lower 1-FEH activity. Although fructan concentration remained unchanged, fructan productivity was higher in plants maintained under elevated {[}CO(2)], due to their higher rhizophore biomass. This is the first report on the effects of elevated {[}CO(2)] on a plant species bearing underground organs that accumulate fructans. Our results indicate that plants of V. herbacea can benefit from elevated atmospheric {[}CO(2)] by increasing growth and carbon allocation for the production of inulin, and may contribute to predict a future scenario for the impact of this atmospheric condition on the herbaceous vegetation of the cerrado. (AU)

• Processo FAPESP: 98/05124-8 - Conservação e uso sustentável da biodiversidade vegetal do Cerrado e da Mata Atlântica: o armazenamento de carboidratos e seu papel na adaptação e manutenção de plantas em seu habitat natural
• Beneficiário: Marcos Silveira Buckeridge
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Temático
• Processo FAPESP: 05/04139-7 - Carboidratos de plantas tropicais como moduladores de processos ecofisiológicos e indicadores de respostas a estresses ambientais
• Beneficiário: Marcia Regina Braga
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 07/59782-7 - Interação entre a atmosfera enriquecida em CO2 e o déficit hídrico: efeitos no crescimento e no metabolismo de frutanos em Vernonia herbaceae (Vell). Rusby
• Beneficiário: Vanessa Fátima de Oliveira
• Modalidade de apoio: Bolsas no Brasil - Doutorado