Hydraulic failure as a primary driver of xylem network evolution in early vascular plants
Jazyk angličtina Země Spojené státy americké Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem, Research Support, U.S. Gov't, Non-P.H.S.
PubMed
36356120
DOI
10.1126/science.add2910
Knihovny.cz E-zdroje
- MeSH
- biologická evoluce * MeSH
- cévnaté rostliny * metabolismus MeSH
- listy rostlin metabolismus MeSH
- období sucha * MeSH
- voda * metabolismus MeSH
- xylém * metabolismus MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Research Support, U.S. Gov't, Non-P.H.S. MeSH
- Názvy látek
- voda * MeSH
The earliest vascular plants had stems with a central cylindrical strand of water-conducting xylem, which rapidly diversified into more complex shapes. This diversification is understood to coincide with increases in plant body size and branching; however, no selection pressure favoring xylem strand-shape complexity is known. We show that incremental changes in xylem network organization that diverge from the cylindrical ancestral form lead to progressively greater drought resistance by reducing the risk of hydraulic failure. As xylem strand complexity increases, independent pathways for embolism spread become fewer and increasingly concentrated in more centrally located conduits, thus limiting the systemic spread of embolism during drought. Selection by drought may thus explain observed trajectories of xylem strand evolution in the fossil record and the diversity of extant forms.
Department of Biology Bates College Lewiston ME USA
Department of Environmental Studies Haverford College Haverford PA USA
Institute of Botany Czech Academy of Sciences Průhonice Czechia
New York Botanical Garden Bronx NY USA
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