S. Add and V. , volume ofice cold 10M LiCl and mix. The RNA is selectively precipitated ovemight on ice. For samples giving very low RNA yield (i.e. transition zone), the extension ofthis precipitation step to 36- 48 hours improve RNA recovery

. Il, Centrifuge at 13 ,000 g for 10' at 4°. Discard the supernatant, dry the RNA pellet and resuspend it in RNase free water

. Legend, Pinus 1.: Pinus taeda, Glycine m.: Glycine maxima. Citrus 1.: Citrus limon. Populus k

. Populus-kitakamiensis, Juglans n.: Juglans nigra (clone PAL xyll)

. Coumarate-coa, Iigase Clustal alignment of peptide sequences of 4-coumarate-CoA ligase (4CL) from several species in comparison ta the sequence cloned from Juglans nigra

. Legend, Pinus 1..: Pinus taeda, Glycine rn.: Glycine maxima. Populus 1.: Populus tremuloides. Nicotiana 1.: Nicotiana tabacum

. Legend, Pinus d.: Pinus densiflora, Glycine m.: Glycine maxima. Camellia s.: Camellia sinensis

J. Hyb, Juglans nigra x regia. Juglans n.: Juglans nigra (clone CHS xyll)

. Legend, Vitis v.: Vitis vinifera. Citrus s.: Citrus sinensis. Ipomoea b.: Ipomoea batatas

. Matthiola-incana, JugJans n.: Juglans nigra (clone F3H xyll)

S. Akada and S. K. Dube, Organization of soybean chalcone synthase gene clusters and characterization of a new member of the family, Plant Molecular Biology, vol.1, issue.2, pp.189-199, 1995.
DOI : 10.1007/BF00043645

M. Sederoff, R. Whetten, and R. W. , Analysis of xylem formation in pine by cDNA sequencing, 1998.

B. Gapped and P. , BLAST: a new generation ofprotein database search programs, Nue! Aeids Res, vol.25, pp.3389-3402

M. G. Baulie, J. Hillam, K. R. Briffa, and D. M. Brown, Re-dating the English art-historical tree-ring chronologies, Nature, vol.51, issue.6017, pp.317-319, 1985.
DOI : 10.1179/030554777786094350

R. K. Bamber, Heartwood, its fonction and formation, pp.1-8, 1976.
DOI : 10.1007/bf00376379

A. D. Bavage, I. G. Davies, M. P. Robbins, and P. Morris, Expression of an Antirrhinum dihydroflavonol reductase gene results in changes in condensed tannin structure and accumulation in root cultures ofLotus corniculatus (bird's foot trefoi1), Plant Mol Biol, vol.34, pp.443-458, 1997.

I. Beritognolo, P. Burtin, C. Breton, J. Charpentier, G. Janin et al., Heartwood formation in wa1nut: involvement ofphenolic metabolism. ISHS, Fourth international walnut symposium, pp.12-16, 1999.

S. Berthier, A. D. Kokutse, A. Stokes, and T. Aud-fourcaud, Irregu1ar heartwood formation in leauing stems of maritime pine (Pinus pinaster Ait.) Annals Bot in press Structure and regulation of the maize Bronze2 promoter, Plant Mol Biol, vol.32, pp.599-609, 1996.

G. P. Bolwell, A role for phosphorylation in the down-regulation of phenylalanine ammonia-lyase in suspension-cultured cells of french bean, Phytochemistry, vol.31, issue.12, pp.4081-4086, 1992.
DOI : 10.1016/0031-9422(92)80418-E

H. H. Bosshard, Aspects of the Aging Process in Cambium and Xylem, Holzforschung, vol.8, issue.3, pp.65-69, 1965.
DOI : 10.2307/2446389

C. Dumas, PCR-generated cDNA library of transition-stage maize embryos: cloning and expression of ca1modu1in genes during ear1y embryogenesis, Plant Mol Biol, vol.27, pp.105-113, 1995.

W. Bruce, O. Folkerts, . Garnaat, O. Crasta, B. Roth et al., Expression profiling of the maize flavonoid pathway genes controlIed by estradiol-inducible transcription factors CRC and P, Plant, vol.12, pp.65-79, 2000.

P. Burtin, C. Jay-allemand, J. P. Charpentier, and G. Janin, Natural wood colouring process in Juglans sp. (J. nigra, J. regia and hybrid J. nigra 23 ??J. regia) depends on native phenolic compounds accumulated in the transition zone between sapwood and heartwood, Trees, vol.12, issue.5, pp.258-264, 1998.
DOI : 10.1007/PL00009716

P. Burtin, Origine biochimique de la couleur du bois de noyer (Juglans spp, 1999.

S. L. Butland, M. L. Chow, and B. E. Aud-ellis, A diverse family of phenylalanine ammonya-lyase genes expressed in pine trees and cell cultures, Plant Molecular Biology, vol.37, issue.1, pp.15-24, 1998.
DOI : 10.1023/A:1005941228246

B. R. Wiseman and E. H. Coe, Quantitative trait loci and metabolic pathways: Genetic control of the concentration ofmaysin, a corn earworm resistance factor, in maize silks, Proc Natl Acad Sei, vol.93, pp.8820-8825, 1996.

S. Chang, J. Puryear, and J. Caimey, A simple and efficient method for isolating RNA from pine trees, Plant Molecular Biology Reporter, vol.197, issue.3, pp.113-116, 1993.
DOI : 10.1007/BF02670468

M. M. Chattaway, THE SAPWOOD-HEARTWOOD TRANSITION, Australian Forestry, vol.8, issue.3, pp.25-34, 1952.
DOI : 10.1139/b51-021

A. Claudot, D. Ernst, S. Heinrich, and A. Drouet, Chalcone synthase activity and polyphenolic compounds of shoot tissues from adult and rejuvenated walnut trees, Planta, vol.203, issue.3, pp.275-282, 1997.
DOI : 10.1007/s004250050192

J. Dangl, K. Hahlbrock, and J. Schell, Regulation and Structure of Chalcone Synthase Genes, 1989.
DOI : 10.1016/B978-0-12-715006-2.50014-6

D. Groot, R. C. Woodward, B. Aud-hennon, and P. E. , Natural decay resistance of heartwood from dead, standing yeliow-cedar trees: laboratory evaluations, For Prod J, vol.50, pp.53-59, 2000.

V. Dellus, A. Scalbert, and G. Janin, Polyphenols and Colour of Douglas Fir Heartwood, Holzforschung, vol.36, issue.4, 1997.
DOI : 10.1007/BF02615355

R. A. Dixon and N. L. Paiva, Stress-induced phenylpropanoid metabolism, Plant, vol.1, issue.7, pp.1085-1097, 1995.

H. K. Dooner, T. P. Robbins, and R. A. Jorgensen, Genetic and Developmental Control of Anthocyanin Biosynthesis, Annual Review of Genetics, vol.25, issue.1, pp.173-199, 1991.
DOI : 10.1146/annurev.ge.25.120191.001133

L. Duroux, F. M. Delmotte, J. Lanceun, G. Kéraviss, and C. Jay-allemand, Insight into naphtoquinone metabolism: b-glucosidase-catalysed hydrolysis of hydrojuglone rl-D-glucopiranoside, 1998.

R. Ebermann and K. Stich, Distribution and seasonal variation of wood peroxidase activity in oak (Quercus robur), pp.391-396, 1985.

J. Ehlting, D. Büttner, Q. Wang, C. J. Douglas, J. E. Somssich et al., Three 4-coumarate:coenzyme A ligases in Arabidopsis thaliana represent two evolutionarily divergent classes in angiosperms, The Plant Journal, vol.98, issue.1, pp.9-20, 1999.
DOI : 10.1104/pp.113.1.65

L. Jouanin, Expression of antisense chalcone synthase RNA in transgenic hybrid walnut microcuttings. Effect on fiavonoid content and rooting ability, Plant Mol Biol, vol.38, pp.467-479, 1998.

E. Euch and C. , Caractérisation des gènes chalcone synthase (chs) chez le noyer hybride Juglans nigra x Juglans regia et modulation de l'activité CHS par la stratégie antisens, 1997.

O. Faktor, G. Loake, R. A. Dixon, and C. J. Lamb, The G-box and H-box in a 39 bp region of a French bean chalcone synthase promoter constitute a tissue-specific regulatory element, The Plant Journal, vol.11, issue.5, pp.1105-1113, 1997.
DOI : 10.1046/j.1365-313X.1997.11051105.x

D. Fengel, Ultrastructural changes during aging ofwood cells, pp.176-188, 1970.
DOI : 10.1007/bf00571852

D. Fengel, Chemical studies on the wood of quebracho colorado (Schinopsis balansae Engl, 1991.

M. A. Frohman, M. K. Dush, and G. R. Martin, Rapid production of full-length cDNAs from rare transcripts: amplification using a single gene-specific oligonucleotide primer., Proceedings of the National Academy of Sciences, vol.85, issue.23, pp.8998-9002, 1988.
DOI : 10.1073/pnas.85.23.8998

K. H. Gardner and G. M. Barton, The distribution of dihydroquercetin in Douglas-fIT and western larch, For Prad J, vol.10, pp.171-173, 1960.

R. Giannini and R. Mercurio, Il noce comune per la produzione legnosa, Avenue Media, 1997.

Z. Gong, M. Yamazaki, M. Sugiyama, Y. Tanaka, and K. Saito, Cloning and molecular analysis of structural genes involved in anthocyanin biosynthesis and expressed in a forma-specifie manner in Perillafrutescens, Plant Molecular Biology, vol.35, issue.6, pp.915-927, 1997.
DOI : 10.1023/A:1005959203396

G. S. Bowen and B. , Engineering secondary metabolism in maize cells by ectopie expression of transcription factors, Plant Cel, pp.721-740, 1998.

K. Han, P. Kamden, E. Retzel, J. Davis, and V. Kapur, Genomics of heartwood formation, Proceedings of the 6 th International Congress of Plant Molecular Biology, pp.18-24, 2000.

C. L. Harker, T. H. Ellis, and E. S. Coen, Identification and Genetic Regulation of the Chalcone Synthase Multigene Family in Pea, THE PLANT CELL ONLINE, vol.2, issue.3, pp.185-194, 1990.
DOI : 10.1105/tpc.2.3.185

E. Haslam, Plant polyphenols. Vegetable tannins revisited, 1989.

S. Hanch and E. Magel, Extractable activilies and protein content of sucrose-phosphate synthase, sucrose synthase and neutral invertase in trunk tissues of Robinia pseudoacacia L. are related to cambial wood production and heartwood formation, Planta, vol.207, pp.266-274, 1998.

E. Hiigglnnd, The chemistry ofwood, pp.15-16, 1951.

Y. Helariutta, M. Kotilainen, P. Elomaa, and T. Teeri, Gerbera hybrida (Asteraceae) imposes regulation at several anatomical levels during inflorescence development on the gene for dihydroflavonol-4-reductase, Plant Molecular Biology, vol.3, issue.5, pp.935-941, 1995.
DOI : 10.1007/BF00042077

W. Heller and G. Forkmann, Biosynthesis of flavonoids The flavonoids: Advances in research since, pp.499-535, 1986.

B. Hengerer, A rapid procedure for rnRNA extraction from a large number of samples, 1993.

T. Higuchi, Biochemistry and molecular biology of wood, p.362, 1997.
DOI : 10.1007/978-3-642-60469-0

W. E. Hillis, Leucoanthocyanidins as the possible precursors of extractives in woody tissues, 1956.

W. E. Hillis and M. Hasegawa, The formation of polyphenols in trees I. Administration of c glucose and subsequent distribution of radioactivity, Phytochemistry, vol.2, issue.2, pp.195-199, 1963.
DOI : 10.1016/S0031-9422(00)82981-7

W. E. Hiuis, Heartwood and tree exudates, p.268, 1987.

T. A. Holton and E. C. Cornish, Genetics and biochemistry of anthocyanin biosynthesis, Plant, vol.7, pp.1071-1083, 1995.

W. Holl and K. Lendzian, Respiration in the sapwood and heartwood of Robinia pseudoacaeia, 1973.

W. Holl, Distribution, fluctuation and metabolism of food reserves in the wood of trees, 2000.

R. A. Savidge, J. Bamett, and R. Napier, Cell and molecular biology of wood formation, BIOS Scientific Publishers Ltd, pp.347-362

. Institut-pour-le-développement-forestier, Les noyers à bois, p.144, 1997.

D. Jones and . Ho, Phenylalanine ammonia-lyase: Regulation of its induction, and its role in plant development, Phytochemistry, vol.23, issue.7, pp.1349-1984, 1984.
DOI : 10.1016/S0031-9422(00)80465-3

H. Junghans, . Dalkiu, and R. A. Dixon, Stress response in alfalfa (Medicago saliva L, p.15, 1993.

R. Kaldenhoff, K. Grote, J. Zhu, and U. Zimmermann, Significance of plasmalemma aquaporins for water-transport in Arabidopsis thaliana, The Plant Journal, vol.341, issue.1, pp.121-128, 1998.
DOI : 10.1098/rstb.1993.0087

J. Gilchrist, D. G. , A. , and D. , In situ isolation ofmRNA from individual plant cells: Creation of cell-specific cDNA libraries, Proc Natl Acad Sei, vol.92, pp.3814-3818, 1995.

M. S. Kemp and R. S. Burden, Phytoalexins and stress metabolites in the sapwood of trees, Phytochemistry, vol.25, issue.6, 1986.
DOI : 10.1016/S0031-9422(00)81269-8

P. Kjellbom, . Larsson, . Johansson, M. Karlsson, and U. Johansson, Aquaporins and water homeostasis in plants, Trends in Plant Science, vol.4, issue.8, pp.308-314, 1999.
DOI : 10.1016/S1360-1385(99)01438-7

R. E. Koes, C. E. Spelt, P. J. Van-den-elzen, and J. N. Mol, Cloning and molecular characterization of the chalcone synthase multigene family of Petunia hybrida, Gene, vol.81, issue.2, pp.245-257, 1989.
DOI : 10.1016/0378-1119(89)90185-6

R. E. Koes, F. Quattrocchio, and J. N. Mol, The flavonoid biosynthetic pathway in plants: Function and evolution, BioEssays, vol.2, issue.2, pp.123-132, 1994.
DOI : 10.1016/S0176-1617(89)80083-5

E. Koopmann, E. Logemann, and K. Hahlbrock, Regulation and Functional Expression of Cinnamate 4-Hydroxylase from Parsley, Plant Physiology, vol.119, issue.1, pp.49-55, 1999.
DOI : 10.1104/pp.119.1.49

W. L. Kubasek, F. M. Ausubel, and B. W. Shirley, A light-independent developmental rnechanism potentiates flavonoid gene expression in Arabidopsis seedlings, Plant Molecular Biology, vol.37, issue.2, pp.217-223, 1998.
DOI : 10.1023/A:1005977103116

C. Allemand, R. Savidge, J. Barnett, and R. Napier, Cambial activity and xylem differentiation in walnut (Juglans sp.), Cell and molecular biology of wood formation, pp.209-221, 2000.

J. W. Larrick and P. D. Siebert, Reverse transcriptase PCR, 1995.

P. R. Larson, The vascular cambium, 1994.
DOI : 10.1007/978-3-642-78466-8

D. Lee, M. Ellard, L. A. Wanner, K. R. Davis, and C. J. Douglas, The Arabidopsis thaliana 4-coumarate:CoA ligase (4CL) gene: stress and developmentally regulated expression and nucleotide sequence of its cDNA, Plant Molecular Biology, vol.18, issue.5, pp.871-884, 1995.
DOI : 10.1007/BF00042072

C. A. Leslie and G. H. Mcgranahan, The origin of walnut, Walnut production manual, pp.3-7, 1998.

N. G. Lewis, L. B. Davin, and S. Sarkanen, The Nature and Function of Lignins, 1999.
DOI : 10.1016/B978-0-08-091283-7.00085-0

H. D. Nakanishi and K. , Comprehensive natural products chemistry. Carbohydrates and their derivates incIuding tannins, ceIIulose and related lignins, pp.617-745

X. Liang, M. Dron, J. Schmid, R. A. Dixon, and C. J. Lamb, Developmental and environmental regulation of a phenylalanine ammonia-Iyase-b-glucuronidase gene fusion in transgenic tobacco plants, Proc Nat! Acad Sei, pp.9284-9288, 1989.

E. Logemann, M. Parniske, and K. Hahlbrock, Modes of expression and common structural features of the complete phenylalanine ammonia-lyase gene family in parsley., Proceedings of the National Academy of Sciences, vol.92, issue.13, pp.5905-5909, 1995.
DOI : 10.1073/pnas.92.13.5905

E. Magel, A. Dronet, A. C. Clandot, and H. Ziegler, Formation of heartwood substances in the stem of Robinia pseudoacacia L., Trees, vol.26, issue.4, pp.203-207, 1991.
DOI : 10.1007/BF02615811

E. Magel, C. Jay-allemand, and . Ziegler, Formation of heartwood substances in the stemwood of Robinia pseudoacaeia L. II. Distribution of nonstructural carbohydrates and wood extractives across the trunk, Trees, vol.8, pp.165-171, 1994.

E. Magel and B. Hübner, L., Botanica Acta, vol.166, issue.4, pp.314-322, 1997.
DOI : 10.1016/0003-9861(75)90364-1

URL : https://hal.archives-ouvertes.fr/hal-01189150

E. Magel, Biochemistry and physiology ofheartwood formation, 2000.

R. Napier, Molecular and ceII biology of wood formation, BIOS Scientific Publishers Lld, pp.363-376

E. Magel, A. Amani, and R. Hampp, Non-structural carbohydrates and catalytic activities of sucrose metabolizing enzymes in trunks of Iwo Juglans species and their role in heartwood formation, 2001.

C. Martin and J. Paz-ares, MYB transcription factors in plants, Trends in Genetics, vol.13, issue.2, pp.67-73, 1997.
DOI : 10.1016/S0168-9525(96)10049-4

C. R. Martin, Structure, Function, and Regulation of the Chalcone Synthase, Int Rev Cytol, vol.147, pp.233-284, 1993.
DOI : 10.1016/S0074-7696(08)60770-6

I. Mcmurrough and T. Baert, IDENTIFICATION OF PROANTHOCYANIDINS IN BEER AND THEIR DIRECT MEASUREMENT WITH A DUAL ELECTRODE ELECTROCHEMICAL DETECTOR, Journal of the Institute of Brewing, vol.72, issue.10, pp.409-416, 1994.
DOI : 10.1002/j.2050-0416.1966.tb02932.x

J. Mol, G. Jenkins, E. Schlifer, and D. Weiss, Signal perception, transduction, and gene expression involved in anthocyanin biosynthesis, Critical Reviews in Plant Sciences, vol.7, issue.5-6, pp.525-557, 1996.
DOI : 10.1046/j.1365-313X.1995.07061021.x

J. Mol, E. Grotewold, and R. Koes, How genes paint flowers and seeds, Trends in Plant Science, vol.3, issue.6, pp.212-217, 1998.
DOI : 10.1016/S1360-1385(98)01242-4

N. Berti and R. , La struttura anatomica dei legno ed il riconoscimento dei legnami italiani di più corrente impiego, Consiglio Nazionale deIIe Ricerche, 1979.

N. D. Nelson, Gross influences on heartwood formation in black walnut and black cherry trees, 1976.

N. D. Nelson, Xylem ethylene, phenol-oxidizing enzymes, and nitrogen and heartwood formation in walnut and cherry, Canadian Journal of Botany, vol.56, issue.6, pp.626-634, 1978.
DOI : 10.1139/b78-070

N. D. Nelson, W. J. Rietveld, and J. G. Isebrands, Xylem ethylene production in five black walnut families in the early stages ofheartwood formation, For Sci, vol.27, pp.537-543, 1981.

L. J. Newmann and M. M. Campbell, MYB proteins and xylem differentiation, 2000.

J. W. Nicholls and A. G. Brown, The inheritance of heartwood formation in Pinus radiata D. Don, Silvae Genetica, vol.23, pp.138-141, 1974.

T. Nobuchi, K. Kuroda, J. Ryutarou, and H. Hiroshi, Cytological study of the seasonal features ofheartwood formation of sugi (Cryptomeriajaponica D. Don), Mokuzai Gakkaishi, vol.28, pp.669-676, 1982.

T. Nobuchi and H. Harada, Physiological features of the "white zone" of sugi (Cryptomeria japonica D.Don) cytological structure and moisture content, Mokuzai Gakkaishi, vol.29, pp.824-832, 1983.

T. Nobuchi, T. Sato, R. Jwata, and H. Harada, Season ofheartwood formation and the related cytological structure of ray parenchyma cells in Robinia pseudoacacia L, Mokuzai Gakkaishi, vol.30, pp.628-636, 1984.

T. Nobuchi, H. Matsnno, and H. Harada, Radial distribution of heartwood phenols and the related cytological structure in the fresh wood ofsugi (Cryptomeriajaponica D. Don), Mokuzai Gakkaishi, vol.31, pp.711-718, 1985.

T. Nobuchi, N. Tokuchi, and H. Harada, Variability of heartwood formation and cytological features in broad-Ieaved trees, Mokuzai Gakkaishi, vol.33, pp.596-604, 1987.

Y. Osakabe, K. Osakabe, S. Kawai, Y. Katayama, and N. Morohoshi, Characterization of the structure and determination of rnRNA levels of the phenylalanine ammonia-Iyase gene family from Populus kitakamiensis, Plant Mol Biol, vol.28, p.1141, 1995.

S. Peng, A. Scalbert, and B. Monties, Insoluble ellagitannins in Castanea sativa and Quercus petraea woods, Phytochemistry, vol.30, issue.3, pp.775-778, 1991.
DOI : 10.1016/0031-9422(91)85250-4

R. Preisig-müller, A. Schwekendiek, J. Brehm, H. Reif, and E. Kindl, Characterization of a pine multigene family contaioing elicitor-responsive stilbene synthase genes, Plant Molecular Biology, vol.39, issue.2, pp.221-229, 1999.
DOI : 10.1023/A:1006163030646

G. M. Preston, Cloning gene family members using the polymerase chaio reaction with degenerate oligonucleotide primers, Methods io molecular biology, pp.97-113, 1997.

F. Quattrocchio, J. F. Wing, K. Van-der-wonde, J. N. Mol, and R. Koes, Analysis of bHLH and MYB domain proteins: species-specific regulatory differences are caused by divergent evolution of target anthocyanin genes, The Plant Journal, vol.2, issue.4, pp.475-488, 1998.
DOI : 10.1007/BF03015868

H. Ragg, D. N. Kuhn, and K. Hahlbrock, Coordinated regulation of 4-coumarate-CoA Iigase and phenylalanine ammonia-Iyase rnRNAs in cultured plant cells, J Biol Chem, vol.256, pp.10061-10065, 1981.

G. Rink, Heartwood color and quantity variation in a young black walnut progeny test, Wood Fiber Sci, vol.19, pp.93-100, 1987.

C. Rosati, A. Cadic, M. Duron, J. Renou, and P. Simoneau, Molecular cloning and expression analysis of dihydroflavonol4-reductase gene in flower organs of Forsythia x intermedia, Plant Molecular Biology, vol.35, issue.3, pp.303-311, 1997.
DOI : 10.1023/A:1005881032409

J. Sambrook, E. F. Fritsch, and T. Maniatis, Molecular cloning: a laboratory manual, 1989.

T. P. Schultz and D. D. Nicholas, Naturally durable heartwood: evidence for a proposed dual defensive function of the extractives, Phytochemistry, vol.54, issue.1, pp.47-52, 2000.
DOI : 10.1016/S0031-9422(99)00622-6

L. Shain and W. E. Huus, in relation to heartwood formation, Canadian Journal of Botany, vol.51, issue.7, pp.1331-1335, 1973.
DOI : 10.1139/b73-166

B. W. Shirley, Flavonoid biosynthesis: "new" functions for an "old" pathway, Trends Plant Sei, vol.1, pp.377-382, 1996.

H. A. Stafford, Flavonoid Evolution: An Enzymic Approach, PLANT PHYSIOLOGY, vol.96, issue.3, pp.680-685, 1991.
DOI : 10.1104/pp.96.3.680

URL : http://www.plantphysiol.org/content/plantphysiol/96/3/680.full.pdf

M. Larsson, R. Villaroel, M. Van-montagu, G. Sandberg, O. Oisson et al., Gene discovery in the wood-forming tissues of poplar: Analysis of 5,692 expressed sequence tags, Proc Natl Acad Sei, pp.13330-13335, 1998.

C. M. Stewart, Excretion and Heartwood Formation in Living Trees, Science, vol.153, issue.3740, pp.1068-1074, 1966.
DOI : 10.1126/science.153.3740.1068

A. Stokes and S. Berthier, Irregular heartwood formation in Pinus pinaster Ait. is related to eccentric, radial, stem growth, Forest Ecology and Management, vol.135, issue.1-3, pp.115-121, 2000.
DOI : 10.1016/S0378-1127(00)00303-0

P. S. Szopa, H. E. Garrett, E. A. Mcginnes, and . Jr, Growth -quality evaluation of black walnut wood. Part 1 -Specific gravity, growth rate, and percent extractables for trees grown on three different sites in Missouri, Wood Science, vol.13, pp.95-98, 1980.

R. H. Thomson, Recent Advances in The Chemistry and Biochemistry of Quinone Pigments, 1979.
DOI : 10.1007/978-1-4684-3372-2_9

D. Treutter, Chemical reaction detection of catechins and proanthocyanidins with 4-dimethylaminocinnamaldehyde, Journal of Chromatography A, vol.467, pp.185-193, 1989.
DOI : 10.1016/S0021-9673(01)93963-9

D. Treutter, C. Sautos-buelga, M. Gutmauu, and H. Kolodziej, Identification of flavan-3-ols and procyanidins by high-performance liquid chromatography and chemical reaction detection, Journal of Chromatography A, vol.667, issue.1-2, pp.290-297, 1994.
DOI : 10.1016/0021-9673(94)89078-1

G. J. Wullems, Regulation of tlavonol biosynthesis during anther and pistil development, and during pollen tube growth in Solanum tuberosum, Plant J II, pp.105-113, 1997.

B. Weisshaar and G. Jenkins, Phenylpropanoid biosynthesis and its regulation, Current Opinion in Plant Biology, vol.1, issue.3, pp.251-257, 1998.
DOI : 10.1016/S1369-5266(98)80113-1

R. W. Whetten and R. R. Sederoff, Phenylalanine ammonia-lyase from loblolly pine, Plant, vol.98, pp.380-386, 1992.

Y. Zhang and M. A. Frohman, Using rapid amplification of cDNA ends (RACE) to obtain fulllength cDNAs cDNA library protocols, Methods in molecular biology, pp.61-87, 1997.

H. Ziegler, Biological aspects of the heartwood formation, Holz als Roh- und Werkstoff, vol.67, issue.2, pp.61-68, 1968.
DOI : 10.1007/BF02083068