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Karim Keshavarz, Kourosh Vahdati, Mahmoud Samar, Behzad Azadegan and Patrick H. Brown

culture Acta Hort. 567 451 454 Luza, J.M. Polito, V.S. 1991 Progamy and chalazogamy in walnut ( Juglans regia ) Bot. Gaz. 152 100 106 Marschner, H. 1986 Functions of mineral nutrients: Macronutrients 195 267 Haynes R.J. Mineral nutrition of higher plants

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Kathy Kelley and Dave Ramos

Fifty trees each of 1-year-old Paradox rootstock June-budded to `Chandler' walnut and 2-year-old Paradox whipgrafted to `Chandler' were planted in a 28 × 28-ft spacing on a Hanford sandy loam soil. Ten trees of each type were selected at time of planting and the number of roots, individual root diameter, trunk diameter, root dry weight, scion dry weight, and total dry weight were compared. All parameters, with the exception of root number, were significantly greater for the grafted 2-year-old rootstocks. Growth of the trees measured as trunk circumference 20 cm above the graft union was significantly greater for the grafted 2-year-old rootstocks following the first season. There was no significant different in trunk circumference between the 1- and 2-year-old rootstocks following the second or third growing seasons.

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Greg T. Browne, Joseph A. Grant, Leigh S. Schmidt, Charles A. Leslie and Gale H. McGranahan

Walnut rootstock ‘RX1’ U.S. Plant Patent No. US PP20,649 P3 19 Jan. 2010 McGranahan, G.H. Tulecke, W. Arulsekar, S. Hansen, J.J. 1986 Intergeneric hybridization in the Juglandaceae : Pterocarya sp. × Juglans regia J. Amer. Soc. Hort. Sci. 111 627 630

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Ningguang Dong, Qingmin Wang, Junpei Zhang and Dong Pei

Cotyledon explants of walnut (Juglans regia) have been shown to generate adventitious roots on growth regulator-free medium. The spatial distribution of endogenous indole-3-acetic acid (IAA) and its dynamic changes during adventitious root formation were investigated using an in situ immunohistochemical approach. Before root induction, IAA signal was distributed throughout the freshly excised cotyledon explants. During provascular bundle differentiation, the IAA signal was mainly located in the provascular bundles. At the stage of annular meristematic zones formation, the IAA signal was mainly distributed in the meristematic zones and decreased in the vascular bundles and cotyledonous parenchyma. As primordia formed, the IAA signal became localized in the root primordia and gradually disappeared in the meristematic zones. In emerging roots, the IAA signal was mainly localized in the root cap and root meristem. These results suggest that accumulation of IAA in the provascular bundles may induce vascular differentiation and the increase in IAA through meristematic zones may be responsible for the adventitious root formation from walnut cotyledons. The direct evidence presented here indicates that IAA accumulated in the meristematic zones is not the sole signal needed to induce adventitious root.

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Anita Solar, Robert Veberic and Franci Stampar

Slovene domestic population of Persian walnut ( Juglans regia L.). ‘Sava’ was tested as ‘Zdole-59’ and ‘Krka’ as ‘Erjavec’ ( Solar and Stampar, 2006 ). Because the original trees grow in the vicinity of rivers Sava and Krka, the new cultivars were named

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Mehmet Sutyemez

ders notları. KSU Ziraat Fakültesi, Kahramanmaraş, Turkey. UPOV 1999 Union internationale pour le protection des obtentions vegetales draft guidelines for the conduct of tests for distinctness, uniformity and stability walnut ( Juglans regia L.), TG

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Asadolah Aslani Aslamarz, Kourosh Vahdati, Majid Rahemi, Darab Hassani and Charles Leslie

injury ( Stergios and Howell, 1973 ). Freeze injury in trees often results from freezing temperatures in fall or after budbreak in the spring ( Rodrigo, 2000 ). Walnut ( Juglans regia L.) is grown in many regions that are susceptible to freezes that can

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Hua Wang, Dong Pei, Rui-sheng Gu and Bao-qing Wang

two dominantly cultivated species, Juglans regia and Juglans sigillata ( Kuang and Lu, 1979 ). Juglans sigillata is found only in southwestern China ( Qu and Sun, 1990 ). Despite the significant global economic value of China's nut and wood

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Wanploy Jinagool, Lia Lamacque, Marine Delmas, Sylvain Delzon, Hervé Cochard and Stéphane Herbette

). Vulnerability curves (VCs) show the percentage loss of xylem conductivity (PLC, %) plotted vs. the xylem water potential. Measurements were conducted on ( A ) six cultivars of Juglans regia : Chandler (Ch, n = 15), Fernette (Ft, n = 13), Fernor (Fo, n

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Mariano F. Galla, Bradley D. Hanson and Kassim Al-Khatib

orchard at the University of California (UC) Davis Plant Science Field Station, near Davis, CA. Walnut trees (cultivar Chandler) were 3 years old and grafted on Paradox ( Juglans hindsii × Juglans regia ) rootstock. The soil was classified as Yolo silt