Gordon H, Fellenberg C, Lackus ND, Archinuk F, Sproule A, Nakamura Y, Köllner TG, Gershenzen J, Overy DP and Constabel CP
(2022) CRISPR/Cas9 disruption of UGT71L1 in poplar connects salicinoid and salicylic metabolism and alters growth and
morphology. Plant Cell: 34, 2925-2947 https://doi.org/10.1093/plcell/koac135
Shay PE, Winder RS, Constabel CP and Troyfymow JA (2022) Fungal community composition as affected by litter chemistry and
weather during four years of litter decomposition in rainshadow coastal Douglas-fir forests. Journal of Fungi: 8(7), 735;
Gourlay G, Hawkins BJ, Albert A, Schnitzler JP and Constabel CP (2021) Condensed tannins as antioxidants that protect poplar
against oxidative stress from drought and UV-B. Plant, Cell and Environment, 45 (2), 362-377.
Ma D, Tang H, Reichelt M, Piirtola EM, Salminen JP, Gershenzon J and Constabel CP (2021) Poplar MYB117 promotes
anthocyanin synthesis and enhances flavonoid B-ring hydroxylation by upregulating the flavonoid 3’,5’-hydroxylase gene.
Journal of Experimental Botany 72, 3864-3880.
Boateng K, Hawkins BJ, Yanchuk AD, Fellenberg C and Constabel CP (2021). ) Factors affecting foliar oregonin and condensed
tannin in red alder (Alnus rubra Bong.): phytochemicals implicated in defense against western tent caterpillar (Malacosoma
californicum Packard).Journal of Chemical Ecology 47, 680–688.
Lea C, Bradbury S and Constabel CP (2021) Anti-herbivore activity of oregonin, a diarylheptanoid found in leaves and bark of
red alder (Alnus rubra). Journal of Chemical Ecology:47: 215-216.
Lea C, Simhadrib C, Bradbury S, Wulff JE, and Constabel CP (2020). Efficient purification of the diarylheptanoid oregonin from
red alder (Alnus rubra) leaves and bark combining aqueous extraction, spray drying and flash-chromatography.
Phytochemical Analysis, 2020: 1-8.
Boateng K, Hawkins BJ, Constabel CP, Yanchuk AD and Fellenberg C (2020). Red alder defense mechanisms against western
tent caterpillar defoliation. Canadian Journal of Forest Research, 51, 627-637.
Gourlay, G, Ma D, Schmidt A, and Constabel CP (2020). MYB134-RNAi poplar plants show reduced tannin synthesis in leaves but
not roots and increased susceptibility to oxidative stress. Journal of Experimental Botany, 71, no. 20, 6601-6611.
Fellenberg C, Corea O, Yan L-H, Archinuk F, Piirtola E-M, Gordon H, Reichelt M, Brandt W, Wulff W, Ehlting J, Constabel, CP
(2019) Discovery of salicyl benzoate UDP- glycosyltransferase, a central enzyme in poplar salicinoid phenolic glycoside biosynthesis.
The Plant Journal, 99, 102-115.
Gourlay, G., Constabel CP (2019) Condensed tannins are inducible antioxidants and protect hybrid poplar against oxidative stress.
Tree Physiology 39: 345-355.
Ma D, and Constabel CP (2019) MYB repressors as regulators of phenylpropanoid metabolism inplants.
Trends in Plant Science 24: 275-289.
Constabel, C.P. (2018) Molecular controls of proanthocyanidin synthesis and structure: prospects for genetic engineering in
crop plants. Journal of Agricultural and Food Chemistry 66, 38: 9882-9888.
Ma D, Reichelt M, Yoshida K, Gershenzon J, Constabel CP (2018) Two R2R3-MYB proteins are broad repressors of flavonoid and
phenylpropanoid metabolism in poplar. The Plant Journal 96: 949-965.
Ferguson A, Carvalho E, Gourlay G, Walker V, Martens S, Salminen J-P and Constabel CP (2018) Phytochemical analysis of
salal berry (Gaultheria shallon Pursh.), a traditionally-consumed fruit from western North America with exceptionally high
proanthocyanidin content. Phytochemistry 147: 203-210.
Shay PE, Constabel CP and Trofymow TA (2018) Evidence for the role and fate of water-insoluble condensed tannins in the
short-term reduction of carbon loss during litter decay. Biogeochemistry 137: 127-141. (open access)
Ullah C, Unsicker SB, Fellenberg C, Constabel CP, Schmidt A, Gershenzon J and Hammerbacher A (2017) Flavan-3-ols are
effective chemical defenses in Poplar against Rust (Melampsora spp.) infection. Plant Physiology 175: 1560-1578 (open access)
Shay PE, Trofymow TA and Constabel CP (2017) An improved butanol-HCl assay for quantification of water-
soluble,acetone:methanol-soluble, and insoluble proanthocyanidins (condensed tannins). Plant Methods 13: 63 (open access)
James AM, Ma D, Mellway R, Gesell A, Yoshida K, Walker V, Tran L, Stewart D, Reichelt M, Jussi Suvanto, Salminen J-P,
Gershenzon J, Séguin A, and Constabel CP (2017) Poplar MYB115 and MYB134 transcription factors regulate proanthocyanidin
synthesis and structure. Plant Physiology 174: 154-171.(open access)
Yoshida K, Ma D and Constabel CP (2015) The MYB182 protein downregulates proanthocyanidin and anthocyanin biosynthesis in
poplar by repressing both structural and regulatory flavonoid genes. Plant Physiology 167 no. 3 693-710. (open access)
Chedgy RJ, Köllner TG and Constabel CP (2015) Functional characterization of two acyltransferases from Populus trichocarpa
capable of synthesizing benzyl benzoate and salicyl benzoate, potential intermediates in salicinoid phenolic glycoside biosynthesis
Phytochemistry, 113, 149-159.
McKown AD, Guy RD, Quamme L, Klapste J, La Mantia J, Constabel CP, El-Kassaby YA, Hamelin R, Zifkin, M and Azam MS (2014)
Association genetics, geograhy, and ecophysiology link stomatal patterning in Populus trichocarpa with carbon gain and disease
resistance trade-offs. Molecular Ecology 23(23): 5771–5790.
Gesell A, Yoshida K, Tran LT and Constabel CP (2014) Characterization of an apple TT2-type R2R3 MYB transcription factor
functionally similar to the poplar proanthocyanidin regulator PtMYB134. Planta 240:497-511.
Boeckler GA, Towns M, Unsicker SB, Mellway RD, Yip L, Hilke I, Gershenzon J and Constabel CP (2014) Transgenic upregulation
of the condensed tannin pathway in poplar leads to a dramatic shift in leaf palatability for two tree-feeding Lepidoptera.
Journal of Chemical Ecology 40(2): 150-158.
Veljanovski V and Constabel CP (2013) Molecular cloning and biochemical characterization of two UDP-glycosyltransferases from
poplar. Phytochemistry, 91:148-157.
Winder RS, Lamarche J, Constabel CP and Hamelin RC (2013) The effects of high-tannin leaf litter from transgenic poplars on
microbial communities in microcosm soils. Frontiers in Microbiology 4, article 290.
Kosonen M, Keski-Saari S, Ruuhola T, Constabel CP and Julkunen-Titto R (2012) Effects of overproduction of condensed tannins
and elevated temperature on chemical and ecological traits of genetically modified hybrid aspens (Populus tremula x P. tremuloides).
Journal of Chemical Ecology) 38(10):1235-1246.
Tran LT, Taylor JS and Constabel CP (2012) The polyphenol oxidase gene family in land plants: Lineage-specific duplication and
expansion. BMC Genomics 13:395.
Barbehenn RV, Niewiadomski J, Kochmanski J and Constabel CP (2012) Limited effect of reactive oxygen species on the
composition of susceptible essential amino acids in the midguts of Lymantria dispar caterpillars.
Archives of Insect Biochemistry and Physiology 81(2): 1-18.
Zifkin M, Jin A, Ozga JA, Zaharia I, Schernthaner JP, Gesell A, Abrams S, Kennedy JA and Constabel CP (2012) Gene expression
and metabolite profiling of developing highbush blueberry (Vaccinium corymbosum L.) fruit indicates transcriptional regulation of
flavonoid metabolism and activation of abscisic acid metabolism. Plant Physiology 158(1): 200-224.
Tran LT and Constabel CP (2011) The polyphenol oxidase gene family in poplar: phylogeny, differential expression and
identification of a novel, vacuolar isoform. Planta 234(4): 799-813.
Barbehenn RV and Constabel CP (2011) Tannins in plant-herbivore interactions. Phytochemistry 72:1551-1565.
Barbehenn RV, Dukatz C, Holt C, Reese A, Martiskainen O, Salminen JP, Yip L, Tran LT and Constabel CP (2010)
Feeding on poplar leaves by caterpillars potentiates foliar peroxidase action in their guts and increases plant resistance.
Oecologia 164: 993-1004.
Dafoe NJ, Gowen BE and Constabel CP (2010) Thaumatin-like proteins are differentially expressed and localized in
phloem tissues of hybrid poplar. BMC Plant Biology 10:191. (Link)
Veljanovski V, Major IT, Patton JJ, Bol E, Louvet S, Hawkins BJ and Constabel CP (2010) Induction of acid phosphatase transcripts,
protein and enzymatic activity by simulated herbivory of hybrid poplar. Phytochemistry 71:619-626.
Constabel CP and Lindroth RL (2010) The impact of genomics on advances in herbivore defene and secondary metabolim in
Populus. In: Genetics and Genomics of Populus (S Jansson, R Bhalaero, A Groover, eds). Springer Verlag, pp. 279-305.
Mellway, RD and Constabel CP (2009) Metabolic engineering and potential functions of proanthocyanidins in poplar.
Plant Signaling & Behavior 4: 790-792.
Mellway RD, Tran LT, Prouse MB, Campbell MM, and Constabel CP (2009) The wound-, pathogen-, and UV-B -responsive MYB134
gene encodes an R2R3 MYB transcription factor that regulates proanthocyanidin synthesis in poplar.
Plant Physiology 150: 924-941.
Dafoe NJ and Constabel CP (2009) Proteomic analysis of hybrid poplar xylem sap. Phytochemistry 70: 856-863.
Dafoe NJ, Zamani A, Ekramoddoullah AKM, Lippert D, Bohlmann J and Constabel CP (2009). Analysis of the poplar phloem
proteome and its response to simulated insect herbivory. Journal of Proteome Research 8: 2341-2350.
Barbehenn RV, Jaros A, Yip L, Tran LT, Kanellis AK and Constabel CP (2008) Evaluating ascorbate oxidase as a plant defense
against leaf-chewing insects using transgenic poplars. Journal of Chemical Ecology 34: 1331-1340.
Not something to spit at? Plant Signaling and Behavior 2: 1-3.
Barbehenn RV, Jones CP, Yip L, Tran LT and Constabel CP (2007) Limited impact of elevated levels of polyphenol oxidase on tree-
feeding caterpillars? Assessing individual plant defenses with transgenic poplar. Oecologia 154: 129-140.
Miranda M, Ralph S, Mellway RM, White R, Bohlmann J, Heath MC and Constabel CP (2007) The transcriptional response of
hybrid poplar to infection by Melampsora medusae leaf rust involves induction of the flavonoid pathway.
Molecular Plant-Microbe Interactions 20: 816-831
Major IT and Constabel CP (2006) Molecular analysis of poplar defense against herbivory. Comparison of wound- and insect
elicitor-induced gene expression. New Phytologist 172: 617-635.
Constabel CP and Major IT (2005) Molecular biology and biochemistry of induced insect defense in Populus. In: Chemical Ecology
and Phytochemistry of Forest Ecosystems. Recent Advances in Phytochemistry 39: 119-143.
Wang J and Constabel CP (2004) Polyphenol oxidase in transgenic Populus enhances resistance to forest tent caterpillar
(Malacosoma disstria) herbivory and is activated in the insect gut. Planta 220: 87-96.
Wang J and Constabel CP (2004) Three polyphenol oxidase genes from hybrid poplar are differentially expressed during
development and after wounding and elicitor treatment. Physiologia Plantarum 122: 344-353.
Christopher ME, Miranda, M, Major IT and Constabel CP (2004) Gene expression profiling of systemically wound-induced
defenses in hybrid poplar. Planta 219: 936-947.
Miranda M, Christopher ME and Constabel CP (2004) The variable nature of herbivore defense: evidence for rapidly diverging
Kunitz trypsin inhibitor genes in Populus. In: Plant Adaptation: Molecular Biology and Ecology. (Cronk QC, Whitton J, Ree RH, and
Taylor IEP, eds). NRC Research Press, Ottawa, pp. 153-158.
Wang J and Constabel CP (2003) Biochemical characterisation of two polyphenol oxidase isoforms from hybrid poplar.
Phytochemistry 64: 115-121.
Haruta M and Constabel CP (2003) Rapid alkalinization factors (RALFs) in poplar cell cultures: peptide isolation, cDNA cloning,
and differential expression in leaves and methyl jasmonate-treated cells. Plant Physiology 131: 814-823.
Peters D and Constabel CP(2002) Molecular analysis of herbivore-induced condensed tannin synthesis: Cloning, expression of
dihydroflavanol reductase from trembling aspen (Populus tremuloides). Plant Journal 32: 701-712.
Haruta M, Major IT, Christopher ME, Patton JJ and Constabel CP (2001) A Kunitz trypsin inhibitor gene family from trembling
aspen (Populus tremuloides Michx.): cloning, functional expression, and induction by wounding and herbivory.
Plant Molecular Biology 46: 347-359.
Haruta M, Pedersen JA and Constabel CP (2001) Polyphenol oxidase and herbivore defense in trembling aspen (Populus
tremuloides): cDNA cloning, expression, and potential substrates. Physiologia Plantarum 112: 552-558.
Constabel CP, Yip L, Patton JJ and Christopher ME (2000) Polyphenol oxidase from hybrid poplar: cloning and expression in
response to wounding and herbivory. Plant Physiology 124: 285-296.