Abstract:
:The vulnerability of the xylem to cavitation is an important trait in plant drought resistance and has been quantified by several methods. We present a modified method for the simultaneous measurement of cavitations, recorded as ultrasound acoustic emissions (UAEs), and the water potential, measured with a thermocouple psychrometer, in small samples of conifer wood. Analyzing the amplitude of the individual signals showed that a first phase, during which the mean amplitude increased, was followed by a second phase with distinctly lower signal amplitudes. We provide a method to separate the two groups of signals and show that for many samples plausible vulnerability curves require rejecting late low-energy UAEs. These very likely do not result from cavitations. This method was used to analyze the differences between juvenile wood, and early and late mature wood in Picea abies (L.) Karst. Juvenile earlywood was more resistant to cavitation than mature earlywood or latewood, which we relate to the tracheid anatomy of the samples.
journal_name
Physiol Plantjournal_title
Physiologia plantarumauthors
Wolkerstorfer SV,Rosner S,Hietz Pdoi
10.1111/j.1399-3054.2012.01605.xsubject
Has Abstractpub_date
2012-10-01 00:00:00pages
184-91issue
2eissn
0031-9317issn
1399-3054journal_volume
146pub_type
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