Tissue-Specific Cell Wall Hydration in Sugarcane Stalks

Autor(es)

Maziero, Priscila ^{[1, 2]} ; Jong, Jennifer ^[3] ; Mendes, Fernanda M. ^[1] ; Goncalves, Adilson R. ^[2] ; Eder, Michaela ^[4] ; Driemeier, Carlos ^[1]

Afiliação do(s) autor(es)

^[1] CTBE CNPEM, Lab Nacl Ciencia & Tecnol Bioetanol, BR-13083970 Campinas, SP - Brazil

^[2] EEL USP, Dept Biotecnol, BR-12060281 Sao Paulo - Brazil

^[3] Univ Calif Berkeley, Coll Nat Resources, Berkeley, CA 94720 - USA

^[4] Max Planck Inst Colloids & Interfaces, Dept Biomat, D-14476 Potsdam - Germany

• Tipo de documento: Artigo Científico
• Fonte: Journal of Agricultural and Food Chemistry; v. 61, n. 24, p. 5841-5847, JUN 19 2013.
• Citações Web of Science: 10

Resumo

Plant cell walls contain water, especially under biological and wet processing conditions. The present work characterizes this water in tissues of sugarcane stalks. Environmental scanning electron microscopy shows tissue deformation upon drying. Dynamic vapor sorption determines the equilibrium and kinetics of moisture uptake. Thermoporometry by differential scanning calorimetry quantifies water in nanoscale pores. Results show that cell walls from top internodes of stalks are more deformable, slightly more sorptive to moisture, and substantially more porous. These differences of top internode are attributed to less lignified walls, which is confirmed by lower infrared spectral signal from aromatics. Furthermore, cell wall nanoscale porosity, an architectural and not directly compositional characteristic, is shown to be tissue-specific. Nanoscale porosities are ranked as follows: pith parenchyma > pith vascular bundles > rind. This ranking coincides with wall reactivity and digestibility in grasses, suggesting that nanoscale porosity is a major determinant of wall recalcitrance. (AU)

• Processo FAPESP: 09/00874-5 - Estudos topoquímicos durante obtenção de etanol a partir de celulose de bagaço e palha de cana-de-açúcar
• Beneficiário: Priscila Maziero
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 10/05523-3 - Alterações nanomorfológicas da matéria lignocelulósica de cana-de-açúcar
• Beneficiário: Carlos Eduardo Driemeier
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores