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John E. Preece and Gale McGranahan

’ Walnut tree with planting date. ‘PARADOXWALNUT Burbank found that seedlings of a J. hindsii × J. regia cross were much more vigorous than seedlings of either species ( Whitson et al., 1914, 1915 ; Fig. 3 ) and that this very rapid growth rate was

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Kendra Baumgartner, Phillip Fujiyoshi, Greg T. Browne, Chuck Leslie and Daniel A. Kluepfel

The most common rootstock for Juglans regia (Persian or “English” walnut) in California is Paradox, typically a hybrid of J. hindsii (Northern California black walnut) × J. regia. Unfortunately, Paradox is very susceptible to Armillaria root disease. The relative resistance to Armillaria mellea of six clonally propagated Paradox rootstocks (AX1, Px1, RR4 11A, RX1, Vlach, VX211) was evaluated and compared with that of clonally propagated J. hindsii rootstock selection W17, J. regia scion cultivar Chandler, and Pterocarya stenoptera (Chinese wingnut). In a growth-chamber assay, plants were micropropagated and rooted in vitro before inoculating the culture medium with A. mellea. At two months post-inoculation, the most resistant and susceptible Paradox rootstocks were AX1 and VX211, respectively, with 9% vs. 70% mortality, and this finding was consistent across three isolates of A. mellea and three replicate experiments. This broad range of resistance within Paradox is consistent with past field trials that tested other genotypes. Our finding of similarly high susceptibility of ‘Chandler’ and W17 (61% vs. 69% mortality) is in contrast to two field trials, in which other J. regia genotypes were more susceptible than those of J. hindsii. A third trial, however, identified some J. regia genotypes as more resistant than those of J. hindsii. Therefore, it is possible that W17, which was not previously tested, is an Armillaria-susceptible genotype of J. hindsii. Based on our findings of repeatable mortality levels across three isolates of A. mellea and three replicate experiments, the growth-chamber assay has promise, albeit with confirmed resistant and susceptible controls, for identifying putative resistant rootstocks (e.g., AX1) in preparation for a field trial with controlled inoculations.

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Kelly M. Oates, Thomas G. Ranney and Darren H. Touchell

Reproductive behavior of diploid and allotetraploid Rhododendron L. ‘Fragrant Affinity’ HortScience 42 31 34 Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of paradox walnut rootstock HortScience 19 507 509 Fulcher, A. Dunwell, W.C. Wolfe, D. 2003

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Cristian Silvestri, Gianmarco Sabbatini, Federico Marangelli, Eddo Rugini and Valerio Cristofori

Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of Paradox walnut rootstock HortScience 19 507 509 Fira, A. Joshee, N. Cristea, V. Simu, M. Harta, M. Pamfil, D. Clapa, D. 2016 Optimization of micropropagation protocol for Goji berry ( Lycium

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Modeste Kan Kouassi, Jane Kahia, Christophe N’guessan Kouame, Mathias Gnion Tahi and Edmond Kouablan Koffi

Régulation, de Stabilisation et de Développement de la filière café-cacao. Dec. 2016. < www.conseilcafecacao.ci/docs/Programme_2Qc_2014-2023.pdf >. Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of Paradox walnut rootstock HortScience 19 507 509 Dudits

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Xiaoming Wang, Yongxin Li, Huijie Zeng, Neng Cai, Zhongquan Qiao, Xiangying Wang and Jianjun Chen

and nutrient status of six species of nursery stock grown in a compost-based medium with recycled nutrient HortScience 39 60 64 Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of paradox walnut root stock HortScience 19 507 509 Duron, M. 1975 La

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Jane Kahia, Siaka Kone, Lucien Diby, Georges Ngoran, Colombe Dadjo and Christophe Kouame

d’Ivoire Corredoira, E. Veitez, A.M. Ballester, A. 2002 Somatic embryogenesis in Elm Ann. Bot. 89 637 644 Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of Paradox walnut root stock Hort. Sci. 19 507 509 Eskes, A. 2005 Proceedings of the

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Mohammad Sadat-Hosseini, Kourosh Vahdati and Charles A. Leslie

of nuts in healthful diets Nutr. Rev. 54 241 245 Driver, J.A. Kuniyuki, A.H. 1984 In vitro propagation of Paradox walnut rootstock [ Juglans hindsii × Juglans regia ] HortScience 19 507 509 Facciola, S. 1990 Cornucopoia: A source book of edible

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Jalil Dejampour, Islam Majidi, Solmaz Khosravi, Sevil Farhadi and Atena Shadmehr

Netherlands Driver, J.H. Kuniyuki, A.H. 1984 In vitro propagation of Paradox walnut rootstock HortScience 19 507 509 Duncan, D.B. 1995 Multiple range and multiple F tests Biometrics 11 1 42 FAO 2008 Food and agriculture commodities production 3 Jan. 2010

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Kelly M. Oates, Darren H. Touchell and Thomas G. Ranney

propagation of paradox walnut rootstock HortScience 19 507 509 Fulcher, A. Dunwell, W.C. Wolfe, D. 2003 Rudbeckia taxa evaluation. Southern Nurserymen’s Assoc. Res. Conf 48 510 512 Gottschalk, W. Wolff, G. 1983 Induced mutations in plant breeding. Springer