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Title: The importance of drought–pathogen interactions in driving oak mortality events in the Ozark Border Region

Authors:
ORCiD logo; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1415872
Grant/Contract Number:
AC05-00OR22725; 233870
Resource Type:
Journal Article: Published Article
Journal Name:
Environmental Research Letters
Additional Journal Information:
Journal Volume: 13; Journal Issue: 1; Related Information: CHORUS Timestamp: 2018-01-05 07:33:44; Journal ID: ISSN 1748-9326
Publisher:
IOP Publishing
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Wood, Jeffrey D., Knapp, Benjamin O., Muzika, Rose-Marie, Stambaugh, Michael C., and Gu, Lianhong. The importance of drought–pathogen interactions in driving oak mortality events in the Ozark Border Region. United Kingdom: N. p., 2018. Web. doi:10.1088/1748-9326/aa94fa.
Wood, Jeffrey D., Knapp, Benjamin O., Muzika, Rose-Marie, Stambaugh, Michael C., & Gu, Lianhong. The importance of drought–pathogen interactions in driving oak mortality events in the Ozark Border Region. United Kingdom. doi:10.1088/1748-9326/aa94fa.
Wood, Jeffrey D., Knapp, Benjamin O., Muzika, Rose-Marie, Stambaugh, Michael C., and Gu, Lianhong. 2018. "The importance of drought–pathogen interactions in driving oak mortality events in the Ozark Border Region". United Kingdom. doi:10.1088/1748-9326/aa94fa.
@article{osti_1415872,
title = {The importance of drought–pathogen interactions in driving oak mortality events in the Ozark Border Region},
author = {Wood, Jeffrey D. and Knapp, Benjamin O. and Muzika, Rose-Marie and Stambaugh, Michael C. and Gu, Lianhong},
abstractNote = {},
doi = {10.1088/1748-9326/aa94fa},
journal = {Environmental Research Letters},
number = 1,
volume = 13,
place = {United Kingdom},
year = 2018,
month = 1
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1088/1748-9326/aa94fa

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  • Environmental control of canopy-level water use efficiency (WUE) during drought was studied at an eddy flux site in an oak-hickory forest in central Missouri, USA. Two consecutive severe droughts in the summers of 2006 and 2007 afforded coverage of a broad range of environmental conditions. We stratified data so as to obtain sub-ranges that minimized cross-correlations among WUE-controlling factors. Our results showed that WUE was subject to control by atmospheric vapor pressure deficit (VPD), soil water potential (SWP) and the ratio of diffuse to total photosynthetically active radiation (If/It). The relationship between WUE and VPD was found to be anmore » exponential decay function, whereas SWP and If/It appeared to control WUE in a linear fashion. VPD was a stronger controller than the other two factors since the former had much better correlations with WUE. It was also observed that the relationship between WUE and any single controlling factor was subject to regulations by the other two. One such example was an opposite response of WUE to SWP between low and high VPD values. An examination of WUE-SWP relationship within the full range of VPD obscured this difference. We also found that the slope of the linear regression between WUE and If/It, if determined within the full range of VPD, was exaggerated in comparison to that obtained in the sub-ranges of VPD. This was attributable to the fact that the two controlling parameters, VPD and If/It, were themselves correlated and direct controls of VPD on WUE were partially reflected in WUE-If/It relationship if considered within the full range of VPD.« less
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  • A polysaccharide from the fungal pathogen Colletotrichum lindemuthianum causes browning and phytoalexin production when applied to the cut surfaces of bean (Phaseolus vulgaris) cotyledons and hypocotyls. The application of an amount of polysaccharide equivalent to less than 100 ng of glucose will elicit this response in the bean tissues. The polysaccharide has been isolated both from culture filtrates and from the mycelial walls of the fungus. Purification of the polysaccharide involved anion and cation exchange chromatography and gel filtration. The polysaccharide has an apparent molecular weight between 1,000,000 and 5,000,000 daltons, and consists predominantly of 3- and 4-linked glucosyl residues.more » (auth)« less
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