Seasonal conductivity and embolism in the roots and stems of two clonal ring-porous trees, @Sassafras albidum (Lauraceae) and Rhus typhina (Anacardiaceae)
Seasonal xylem (wood) conductivity and embolism (air blockage) patterns were monitored in roots vs. stems of two clonal ring- porous tree species, Sassafras albidum and Rhus typhina, throughout 1996 and 1997. Stems of both species were 100\% embolized in the early spring and became conductive by late June following leaf expansion and maturation of new earlywood vessels. Dyes indicated the stem conduction was restricted almost exclusively to the current year?s growth ring. Stems became totally embolized again by early October, before the ?rst freezing temperatures. In contrast, woody roots of both species maintained low embolism values, many conductive growth rings, and high conductivity values regardless of the season. No positive root pressures were detected in either species. The mean frost depth (204 11 mm) was deeper than all sampled roots of Rhus and 47\% of sampled roots of Sassafras. The roots that had been in frozen soil either avoided embolism altogether or they were able to reverse embolism by a mechanism other than positive root pressures.
(private-note)roots have larget conduit diameters than stems and might therefore be more vulnerable to embolism... but they aren't The mechanism for possible recovery from win- ter embolism was also investigated using bubble manometers to measure root pressure. In addition, crystal violet dye was used to see which conduits were conductive no root pressures pre-emptive 100\% embolism in some of the stems even before the first frosts. Perhaps related to the clonal habit.
%0 Journal Article
%1 Jaquish_Ewers_01
%A Jaquish, L. J.
%A Ewers, F. W.
%D 2001
%J American Journal of Botany
%K bibtex-import, citeulikeExport embolism, freezebolism, refilling, snowgumpapermaybe
%P 206--212
%T Seasonal conductivity and embolism in the roots and stems of two clonal ring-porous trees, @Sassafras albidum (Lauraceae) and Rhus typhina (Anacardiaceae)
%U http://www.amjbot.org/cgi/content/abstract/88/2/206
%V 88
%X Seasonal xylem (wood) conductivity and embolism (air blockage) patterns were monitored in roots vs. stems of two clonal ring- porous tree species, Sassafras albidum and Rhus typhina, throughout 1996 and 1997. Stems of both species were 100\% embolized in the early spring and became conductive by late June following leaf expansion and maturation of new earlywood vessels. Dyes indicated the stem conduction was restricted almost exclusively to the current year?s growth ring. Stems became totally embolized again by early October, before the ?rst freezing temperatures. In contrast, woody roots of both species maintained low embolism values, many conductive growth rings, and high conductivity values regardless of the season. No positive root pressures were detected in either species. The mean frost depth (204 11 mm) was deeper than all sampled roots of Rhus and 47\% of sampled roots of Sassafras. The roots that had been in frozen soil either avoided embolism altogether or they were able to reverse embolism by a mechanism other than positive root pressures.
@article{Jaquish_Ewers_01,
abstract = {{Seasonal xylem (wood) conductivity and embolism (air blockage) patterns were monitored in roots vs. stems of two clonal ring- porous tree species, Sassafras albidum and Rhus typhina, throughout 1996 and 1997. Stems of both species were 100\% embolized in the early spring and became conductive by late June following leaf expansion and maturation of new earlywood vessels. Dyes indicated the stem conduction was restricted almost exclusively to the current year?s growth ring. Stems became totally embolized again by early October, before the ?rst freezing temperatures. In contrast, woody roots of both species maintained low embolism values, many conductive growth rings, and high conductivity values regardless of the season. No positive root pressures were detected in either species. The mean frost depth (204 11 mm) was deeper than all sampled roots of Rhus and 47\% of sampled roots of Sassafras. The roots that had been in frozen soil either avoided embolism altogether or they were able to reverse embolism by a mechanism other than positive root pressures.}},
added-at = {2019-03-31T01:14:40.000+0100},
author = {Jaquish, L. J. and Ewers, F. W.},
biburl = {https://www.bibsonomy.org/bibtex/2773027f0a6d1c043c96382772eaf5c92/dianella},
citeulike-article-id = {1523750},
citeulike-linkout-0 = {http://www.amjbot.org/cgi/content/abstract/88/2/206},
comment = {(private-note)roots have larget conduit diameters than stems and might therefore be more vulnerable to embolism... but they aren't The mechanism for possible recovery from win- ter embolism was also investigated using bubble manometers to measure root pressure. In addition, crystal violet dye was used to see which conduits were conductive no root pressures pre-emptive 100\% embolism in some of the stems even before the first frosts. Perhaps related to the clonal habit.},
interhash = {c49f81300d229720793b9ff36c162282},
intrahash = {773027f0a6d1c043c96382772eaf5c92},
journal = {American Journal of Botany},
keywords = {bibtex-import, citeulikeExport embolism, freezebolism, refilling, snowgumpapermaybe},
pages = {206--212},
posted-at = {2007-07-31 06:20:31},
priority = {2},
timestamp = {2019-03-31T01:16:26.000+0100},
title = {{Seasonal conductivity and embolism in the roots and stems of two clonal ring-porous trees, @Sassafras albidum (Lauraceae) and Rhus typhina (Anacardiaceae)}},
url = {http://www.amjbot.org/cgi/content/abstract/88/2/206},
volume = 88,
year = 2001
}