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ARS Home » Pacific West Area » Corvallis, Oregon » Horticultural Crops Production and Genetic Improvement Research Unit » People » Schreiner, Paul

Roger P Schreiner (Paul)

Plant Physiologist

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3420 NW Orchard Ave
Corvallis, OR 97330
(541) 738-4084

Paul’s research focuses on grapevine physiology, nutrition, and symbiosis with arbuscular mycorrhizal fungi (AMF) in order to develop sustainable practices that promote plant and soil health and improve fruit quality.


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A Chardonnay vineyard in the Willamette Valley where soil and foliar nitrogen applications were recently studied.


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A Pinot noir root that was cleared and stained showing intense colonization by symbiotic, arbuscular mycorrhizal fungi (in blue). Arbuscules (tree-like structures) are complex structures formed by both the plant and fungus that facilitate nutrient transfer between symbionts.


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Canopy shape in Traditional VSP (vertical shoot positioning) and Wide VSP training system under study to examine if increasing midday sunlight interception can improve productivity and quality of Pinot noir.

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