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Reasons for the presence or absence of convective (pressurized) ventilation in the genus Equisetum.
MedLine Citation:
PMID:  21106036     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
• The very high rates of convective ventilation reported recently in Equisetum telmateia (up to 120 cm(3)  min(-1) ; internal wind speed, 10 cm s(-1) ) prompted this study of a further eight species for the presence or absence of convection and the possible reasons for this. • Convection rates were examined in relation to anatomical pathways, internal resistance to applied pressurized gas flow and stomata. • Only species with interconnecting cortical aerenchyma in branches (when present), shoots and rhizomes induced convection. Rapid humidity-induced convection (HIC) occurred in E. palustre (up to 13 cm(3)  min(-1) ), with slower rates in E. × schaffneri and E. ramosissimum (≤ 6 and 3 cm(3)  min(-1) , respectively). Excised shoots of E. hyemale and E. fluviatile showed the potential for HIC (≤ 0.5 and 0.15 cm(3)  min(-1) , respectively), but not into the rhizomes. High rates were linked to low internal gas flow resistance. No convection was detected in E. scirpoides, E. sylvaticum or E. arvense due to the extremely high resistance to pressure flow, for example, from intercalary meristems and, in the last two, to nonaerenchymatous branches. • Of the nine Equisetum species studied so far, four showed through-flow convection; the other species must rely solely on diffusion for underground aeration in wet soils.
Authors:
Jean Armstrong; William Armstrong
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Publication Detail:
Type:  Journal Article     Date:  2010-11-25
Journal Detail:
Title:  The New phytologist     Volume:  190     ISSN:  1469-8137     ISO Abbreviation:  New Phytol.     Publication Date:  2011 Apr 
Date Detail:
Created Date:  2011-03-29     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882884     Medline TA:  New Phytol     Country:  England    
Other Details:
Languages:  eng     Pagination:  387-97     Citation Subset:  IM    
Copyright Information:
© 2010 The Authors. New Phytologist © 2010 New Phytologist Trust.
Affiliation:
Department of Biological Sciences, University of Hull, Kingston upon Hull, HU6 7RX, UK and School of Plant Biology, Faculty of Natural and Agricultural Sciences, The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.
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