Abstract：
:Studies of the hydraulic properties of xylem vessels have been limited to measurements of whole plant or whole stem segments. This approach allows the longitudinal transport properties of the ensemble of vessels within a stem to be determined, but provides little information on radial transport. Here the xylem of Fraxinus americana L. has been examined using a new method that allows the transport properties of individual vessels to be examined. One goal of this study was to quantify transport parameters relevant to embolism repair. The longitudinal conductivity of vessel segments open at both ends (i.e. no end walls) agreed with values predicted by the Poiseuille equation. Radial specific conductance (conductance per unit area) was approximately six orders of magnitude lower than the longitudinal conductance of the vessel segment normalized by the cross-sectional area of the vessel lumen. There was a step increase in the radial specific conductance of previously gas-filled vessels when the delivery pressure exceeded 0.4 MPa. This is consistent with the idea that positive pressure, required for embolism repair, can be compartmentalized within a vessel if the bordered pit chambers are gas-filled. The diffusion coefficient for the movement of gas from a pressurized air-filled vessel was of the same order of magnitude as that for air diffusing through water (1.95 e(-9) m(2) s(-1)). Estimates of the time needed to displace all of the gas from an air-filled vessel were in the order of 20 min, suggesting that gas removal may not be a major limitation in embolism repair.
journal_name
J Exp Botjournal_title
Journal of experimental botanyauthors
Zwieniecki MA,Melcher PJ,Holbrook NMkeywords:
subject
Has Abstractpub_date
2001-02-01 00:00:00pages
257-64issue
355eissn
0022-0957issn
1460-2431journal_volume
52pub_type
杂志文章abstract：:Very long chain aliphatic compounds occur in the suberin polymer and associated wax. Up to now only few genes involved in suberin biosynthesis have been identified. This is a report on the isolation of a potato (Solanum tuberosum) 3-ketoacyl-CoA synthase (KCS) gene and the study of its molecular and physiological rele...
journal_title：Journal of experimental botany
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更新日期：2009-01-01 00:00:00
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2015-01-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erp300
更新日期：2010-01-01 00:00:00
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journal_title：Journal of experimental botany
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更新日期：2001-06-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2020-01-23 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2007-01-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章,评审
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更新日期：2019-03-27 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2019-10-24 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erv529
更新日期：2016-03-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/err199
更新日期：2011-10-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/eru032
更新日期：2014-04-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erg069
更新日期：2003-02-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2011-08-01 00:00:00
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journal_title：Journal of experimental botany
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pub_type： 杂志文章,评审
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更新日期：2008-01-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
doi：10.1093/jxb/erp256
更新日期：2009-01-01 00:00:00
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更新日期：2014-08-01 00:00:00
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更新日期：2018-07-18 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2020-10-07 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2012-04-01 00:00:00
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journal_title：Journal of experimental botany
pub_type： 杂志文章,评审
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更新日期：2015-05-01 00:00:00
abstract：:Sweet cherry is a non-climacteric fruit and its ripening is regulated by abscisic acid (ABA) during fruit development. In this study, four cDNAs (PacCYP707A1-4) encoding 8'-hydroxylase, a key enzyme in the oxidative catabolism of ABA, were identified in sweet cherry fruits using tobacco rattle virus-induced gene silen...
journal_title：Journal of experimental botany
pub_type： 杂志文章
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更新日期：2015-07-01 00:00:00
