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Titolo:
BIOMECHANICAL ANALYSIS OF PITUS-DAYI - EARLY SEED PLANT VEGETATIVE MORPHOLOGY AND ITS IMPLICATIONS ON GROWTH HABIT
Autore:
SPECK T; ROWE NP;
Indirizzi:
UNIV FREIBURG,BOT GARTEN,SCHANZLESTR 1 D-79104 FREIBURG GERMANY UNIV MONTPELLIER 2,INST SCI EVOLUT,ISEM,PALEOBOT LAB,CNRS,URA 327 F-34095 MONTPELLIER 05 FRANCE
Titolo Testata:
Journal of plant research
fascicolo: 1088, volume: 107, anno: 1994,
pagine: 443 - 460
SICI:
0918-9440(1994)107:1088<443:BAOP-E>2.0.ZU;2-U
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEN-NOV; THIGMOMORPHOGENESIS; MECHANICS; WIND;
Keywords:
BENDING MECHANICS; EFFECTIVE PERIDERM; ONTOGENY; PITUS DAYI; SELF-SUPPORTING HABIT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
62
Recensione:
Indirizzi per estratti:
Citazione:
T. Speck e N.P. Rowe, "BIOMECHANICAL ANALYSIS OF PITUS-DAYI - EARLY SEED PLANT VEGETATIVE MORPHOLOGY AND ITS IMPLICATIONS ON GROWTH HABIT", Journal of plant research, 107(1088), 1994, pp. 443-460

Abstract

A biomechanical method to distinguish self-supporting and non self-supporting growth habits is applied to exceptionally preserved ''twigs''of Pitus dayi Gordon, The analysis investigates whether these isolated stem segments are consistent with a self-supporting tree-like habit as suggested by the stumps, trunks and branches of the genus Pitus Witham preserved more commonly in the fossil record. Because of difficulties in accurately identifying certain fossil tissues, three centrisymmetrical models were constructed to test a range of possible tissue combinations over five ontogenetic stages. The results suggest a self-supporting habit with trends in mechanical parameters during ontogeny similar to those of extant, self-supporting plants. Less explicitly constrained to the analysis of habit, the investigation also examines the structural significance of specific tissues during ontogeny as observedfrom contributions of individual tissues to cross-sectional area, axial second moment of area and flexural stiffness. Pitus dayi produced aphysiologically ''cheap'' primary cauline cortex which was rapidly replaced by the development of a rhytidome. A mechanically significant, cauline hypoderm comprising thick-walled sclerenchymatous tissue is absent. This arrangement differs from other tested Palaeozoic pteridosperms interpreted as semi-self-supporting such as Lyginopteris oldharniaand Calamopitys sp. in which the primary cortex is mechanically significant and secondary growth of the wood does not reach mechanically significant thresholds within the primary body.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 10:38:19