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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Changes in Whole-Plant Metabolism during the Grain-Filling Stage in Sorghum Grown under Elevated CO2 and Drought

Texto completo
Autor(es):
De Souza, Amanda P. [1] ; Cocuron, Jean-Christophe [2, 3] ; Garcia, Ana Carolina [1] ; Alonso, Ana Paula [2] ; Buckeridge, Marcos S. [1]
Número total de Autores: 5
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Inst Biosci, Dept Bot, Lab Plant Physiol Ecol, BR-05508090 Sao Paulo - Brazil
[2] Ohio State Univ, Dept Mol Genet, Columbus, OH 43210 - USA
[3] Ohio State Univ, Ctr Appl Plant Sci, Columbus, OH 43210 - USA
Número total de Afiliações: 3
Tipo de documento: Artigo Científico
Fonte: Plant Physiology; v. 169, n. 3, p. 1755-1765, NOV 2015.
Citações Web of Science: 13
Resumo

Projections indicate an elevation of the atmospheric CO2 concentration ({[}CO2]) concomitant with an intensification of drought for this century, increasing the challenges to food security. On the one hand, drought is a main environmental factor responsible for decreasing crop productivity and grain quality, especially when occurring during the grain-filling stage. On the other hand, elevated {[}CO2] is predicted to mitigate some of the negative effects of drought. Sorghum (Sorghum bicolor) is a C-4 grass that has important economical and nutritional values in many parts of the world. Although the impact of elevated {[}CO2] and drought in photosynthesis and growth has been well documented for sorghum, the effects of the combination of these two environmental factors on plant metabolism have yet to be determined. To address this question, sorghum plants (cv BRS 330) were grown and monitored at ambient (400 mu mol mol(-1)) or elevated (800 mu mol mol(-1)) {[}CO2] for 120 d and subjected to drought during the grain-filling stage. Leaf photosynthesis, respiration, and stomatal conductance were measured at 90 and 120 d after planting, and plant organs (leaves, culm, roots, prop roots, and grains) were harvested. Finally, biochemical composition and intracellular metabolites were assessed for each organ. As expected, elevated {[}CO2] reduced the stomatal conductance, which preserved soil moisture and plant fitness under drought. Interestingly, the whole-plant metabolism was adjusted and protein content in grains was improved by 60% in sorghum grown under elevated {[}CO2]. (AU)

Processo FAPESP: 11/52065-3 - Uso da abordagem de biologia de sistemas para desenvolver um modelo de funcionamento em plantas
Beneficiário:Marcos Silveira Buckeridge
Linha de fomento: Auxílio à Pesquisa - Parceria para Inovação Tecnológica - PITE
Processo FAPESP: 13/50316-4 - Impact of elevated CO2 and drought on metabolism of Sorghum
Beneficiário:Marcos Silveira Buckeridge
Linha de fomento: Auxílio à Pesquisa - Regular