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United States Department of Agriculture

Agricultural Research Service

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Research Project: Aquaporin-regulated Response of Grapevine Roots to Salinitya

Location: Crops Pathology and Genetics Research

Project Number: 2032-21220-004-15-T
Project Type: Trust Fund Cooperative Agreement

Start Date: Apr 14, 2010
End Date: Dec 31, 2013

Evaluate the aquaporin-regulated hydraulic response of various grapevine rootstocks to salinity and test the ability of calcium to ameliorate this stress. Evaluate the aquaporin-regulated hydraulic response of various grapevine rootstocks to a range of abiotic factors (i.e., drought, anoxia, nutrient-pulses, chilling) and their influence on known grapevine rootstock vigor classifications. Utilize the molecular evidence from the physiological analysis to develop rapid markers suitable for salinity tolerance selection. Manipulate aquaporin activity of grapevine roots via irrigation/fertigation management to improve grapevine vigor and fruit quality.

A variety of grapevine rootstocks and species will be grown both hydroponically and in potting soil in greenhouses. We will measure the hydraulic conductivity of excised fine roots and whole root systems using ultra-low flowmeters and cell pressure probe technologies and whole root systems using pressure chambers. Functional aquaporin activity will be assessed by measuring reductions in hydraulic conductivity of individual fine roots and whole root systems after treatment with known aquaporin inhibitors. Molecular aquaporin activity will initially be evaluated using aquaporin molecular probes previously developed for grapevines. Over the long term, aquaporin protein abundance and immunolocalization analysis in fine roots will be conducted. Documents Reimbursable Agreement with American Vineyard Foundation. Log 41322.

Last Modified: 06/21/2017
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