Evolucija lesnih rastlin

Torelli, Niko (author)

Prehod od gimnosperm k angiospermam se je izvršil med juro in spodnjo kredo. Najzgodnejši fosili angiospermskih listov in lesa datirajo izpred 125-130 milijonov let. Najstarejši znani fosil sveta je star približno 120 milijonov let. Enokaličnice in dvokaličnice so se ločile v dve evolucijski liniji pred manj kot 120 milijoni let. Trahejni členi so se razvili iz traheid in so po izvoru polifiletski. Opisani so poglavitni trendi lesne evolucije, prav tako znaki, ki so v zvezi s temi trendi, in znaki, ki niso v zvezi z njimi. Skrajševanje fuziformnih kambijevih inicialk pri angiospermah je spremljalo zunajkambijsko podaljševanje vlaken. Diskutiran je prehod iz lesnega tipa stebla v zelnatega.

• Language: Slovenian
• Keywords: les, evolucija, angiosperme
• Work type: Not categorized (r6)
• Tipology: 1.02 - Review Article
• Organization: BF - Biotechnical Faculty
• Year: 1998
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije
• Number of pages: str. 249-257
• Numbering: Let. 50, št. 9
• UDC: 630*81:575.8
• ISSN on article: 0024-1067
• COBISS.SI-ID: 197001
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Record is a part of a journal

• Title: Les
• Shortened title: Les
• Publisher: Zveza društev inženirjev in tehnikov gozdarstva in lesarstva Slovenije
• ISSN: 0024-1067
• COBISS.SI-ID: 13940224

Secondary language

• Language: Slovenian
• Title: Evolution of woody plants

Abstract

Transition from gymnosperm to angiosperm occured during the Jurassic and lower Cretaceous Periods. The earliest fossils of angiosperm leaves and wood date to about 125-130 million years. The oldest known fossil flower is about 120 million years old. Monocots and dicots separated into two evolutionary lineages less than 120 million years. Vessel elements evolved from tracheids and are polyphyletic in origin. Mayor trends of xylem evolution as well the features related and not related to this trends are described. Shortening of fusiform cambial initials in angiosperms was accompanied by the extracambial intrusive elongation of fibres. The transition from the woody stem to the herbaceous typ is discussed.

• Keywords: wood, evolution, angiosperms