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Titolo:
Micromechanics and anatomical changes during early ontogeny of two lianescent Aristolochia species
Autore:
Kohler, L; Speck, T; Spatz, HC;
Indirizzi:
Univ Freiburg, Inst Biol 3, Plant Biomech Grp, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 ch Grp, D-79104 Freiburg, Germany Univ Freiburg, Bot Garten, Plant Biomech Grp, D-79104 Freiburg, Germany Univ Freiburg Freiburg Germany D-79104 ch Grp, D-79104 Freiburg, Germany
Titolo Testata:
PLANTA
fascicolo: 5, volume: 210, anno: 2000,
pagine: 691 - 700
SICI:
0032-0935(200004)210:5<691:MAACDE>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
HOLLOW-STEMMED SPHENOPSIDS; FUNCTIONAL-ANATOMY; BIOMECHANICS; CELLULOSE; FORCES;
Keywords:
Aristolochia (stem biomechanics); biomechanics; cellulose microfibril orientation; lignin; X-ray analysis;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
39
Recensione:
Indirizzi per estratti:
Indirizzo: Kohler, L Univ Freiburg, Inst Biol 3, Plant Biomech Grp, Schanzlestr 1, D-79104 Freiburg, Germany Univ Freiburg Schanzlestr 1 Freiburg Germany D-79104 g, Germany
Citazione:
L. Kohler et al., "Micromechanics and anatomical changes during early ontogeny of two lianescent Aristolochia species", PLANTA, 210(5), 2000, pp. 691-700

Abstract

The mechanical properties of young stems of Aristolochia macrophylla Lam. and Aristolochia brasiliensis Mart. et Zucc. were studied during elongationgrowth and primary differentiation. Data for the modulus of elasticity, for the viscoelastic behaviour caused by longitudinal tension and for the shear modulus resulting from torsion around a longitudinal axis were related to the underlying structural changes by quantitative analysis of stem anatomy, tissue distribution, ultrastructure, and cell wall biochemistry. The orientation of cellulose microfibrils was determined by light microscopy and small-angle X-ray diffraction, and the lignin content was determined by thioglycolic acid derivatization and spectroscopic quantification. It was demonstrated that the increase in stability during early development is due to the complementary effects of increase in cell wall material, lignification, and cellulose microfibril alignment. A detailed micromechanical model, considering internal prestresses, is proposed to explain the characteristic biphasic stress-strain behaviour as well as the strain-hardening observed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 01/12/20 alle ore 10:06:06