IXth INTERNATIONAL SYMPOSIUM

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1 PROCEEDINGS OF THE IXth INTERNATIONAL SYMPOSIUM ON PLUM AND PRUNE GENETICS, BREEDING AND POMOLOGY Convener F. Sottile Palermo, Italy March 16-19, 2008 ISHS Section Pome and Stone Fruits ISHS Working Group on Plum Acta Horticulturac 874 September 2010 TIB/UB Hannover

2 LIST OF CONTENTS Foreword 5 Preface 6 List of Contents 7 List of Authors 1 ] List of Participants 13 Introduction Opening Address 19 W. Hartmann Plum Production in Italy: State of the Art and Perspectives 25 F. Sottile, E. Bellini, V. Nencetti, C. Mennone, C. Peano, U. Palara, P. Pirazzini, B. Mezzetti, F. Capocasa and I. Calalano Genetic Resources, Breeding and Genetics Biodiversity of Sicilian Fruit Trees: Studies on Plums 37 F. M. Impallari, M, Monte, V. Girgenti, M.B. Del Signore and F, Sottile Inheritance of Some Fruit Characters in Plum (Primus domestica L.) 45 S.H. Hjeltnes, L. Names and O.A. Rognli Breeding of New Plum Cultivars in Romania 51 M. Butac, I. Zagrai and M. Bom Establishing of a PPV Isolate Collection as a Prerequisite for an Effective Selection Process in Breeding Plums for Durable Resistance against./. Hadersdorfer, M. Neumiiller, T. Fischer and D. Treutter Sharka 59 The High-Quality 'Prugna di Lentigione' Processing Plum 63 M, Grandi Jr., M, Grandi, S. Lugli, S. Venturi and S. Sansavini Breeding High-Quality Plums at Bologna University's CMVF-DCA 69 S. Lugli, R. Curreale, M. Grandi Jr. and S. Sansavini A Survey of Self-Rooted Old Plum Types in Norway 77 S.H. Hjeltnes and A. Asdal Orchard Management, Nutrition, Quality and Post-Harvest Effect of Potassium Foliar Spray on Two Plum Trees Cultivars: 'Strival' and 'Black Star' 83 M Ghanem and M. Ben Mimotm The Effect of Foliar Fertilization with Potassium and Magnesium on Fruit Quality in Plums (Primus domestica L.): Preliminary Results 91 E. Vangdal, S.B. FlatkmdandJ.K. Mehl A Preliminary Transcriptomic Approach to Elucidate Post Harvest Ripening of Plum Fruit 99 G. A. Mcmganaris, C. Bonghi, A. Ramina, V. Ziosi, G. Costa and P. Tonutti

3 S-AIIele Using Spring Weather Data to Predict Harvest Date for 'Improved French' Prune 1 7 C. DeBuse, G. Lopez and T. DeJong Possibilities Tor Organic Production of Plum Fruits from (he 'Cacanska Lepotica' Cultivar by Applying Trench '' 3 Planting H. Dinkova, K. Dragoyski, B. Stefcmova, P. Mihaylova, I. Vitanova and A. Rusenov Fruit Flesh Firmness in Two Plum Cultivars: Comparison of Two Penetrometers '' 9 L. Sekse and U. Wermund Criteria for Picking Plums (Primus domestica L.) at the Optimum Maturity Stage for the Fresh Fruit Market 125 E. Vangdal and S.B. Flatkmd Effect of Post Harvest Fruit Conditioning of Two Different Plum Cultivars: First Results on Qualitative Traits Evolution 131 V. Girgenti, F.M. Impallari, M. Monte, N. Giuggioli and G. Reita Some Evidence about the Physiological Basis of Flesh Reddening Symptoms in Plum Fruit 137 G.A. Maiiganaris, A.R. Vicente, C.H. Crisosto tmdj.m. Labaviteh New Strategy to Improve Plums Yields and Fruit Quality Using Bioregulators 141 V. Chitu, M. ButacandS. NicoUw Biology Phenological Expression in Primus salicina Lindl. Genotypes and Its Relationship with Insect Attraction and Pollination 151 S. Radiee, E. Giordani, V. Nencetti and E, Bellini Self-Compatibility in the Japanese Plum Cultivar 'Honey Rosa' 157 K. Beppu, I. Endo and 1. Kataoka High Temperatures during Bloom Can Inhibit Pollen Germination and Tube Growth, and Adversely Affect Fruit Set in the Primus domestica Cultivars 'Improved French' and 'Muir Beauty' 163 M.T. De Ceaultand VS. Polito Self-Incompatibility in Japanese Plum - M.E. Guerra, J. Rodrigo, M. Lopez-Corrales Genotyping of Cultivars 169 and A. Wiinsc/i Environmental Factors and Their Influence on Some Physiological Processes in Plum Tree 175 S. Cosmulescu, A. Bach/ and M. Gntia Preliminary Cytogenetic Studies in Primus salicina Lindl. 183 M.E. Tot am, A. Fernandez, S. Radice, E. Giordani, V. Nencetti and E. Bellini H

4 Influence of Pollination on the Low Fruit Set in Japanese Plum M.E. Guerra, A. Wiinsch, M. Lopez-Corrales and J. Rodrigo Flowering and Pollination Studies with European Plum {Primus domestica L.) Cultivars E. Koskela, H. Kemp andm.c.a. van Dieren Pollination in Japanese Plum V. Nencetti, E. Giordani, E, Bellini ands. Radice Disease Control and PPV Possibility of Reducing Chemical Treatments Aimed at Control of Plum Insect Pests R. Andreev and H. Kutinkovu Breeding for Sharka Resistance and High Fruit Quality in European Plum (Primus domestica L.) at Weihenstephan: Breeding Strategy and Selection Tools M. Neumiiller, D. Treutter and W. Hartmann Control of Sharka by Breeding W. Hartmann and M. Neumiiller Evaluation of PPV Symptoms in Plum Germplasm after Artificial Infection F. Paprstein, A. Matejicek, J. Kaplan and J. Sedlak In Vitro Grafting as a Tool for Investigating the Hypersensitivity of European Plum (Primus domestica L.) to the Plum pox virus L. Lichtenegger, M. Neumiiller and D. Treutter In Vitro Germination of Primus domestica Seeds K. Paskas, M. Neumiiller and D. Treutter Cultivars and Rootstocks The Growth and Yields of Eight Plum Cultivars Grafted on Two Rootstocks in Central Poland E. Rozpara, A, Glowacka andz.s. Grzyb Early Performance of Two European Rootstocks B.H. Pedersen Plum Cultivars on Thirteen Plum The Italian Plum Rootstock Trial: Results for Sicilian Environmental Conditions M Monte, F.M. Impallari, G. Sal a, A. De Michele and F. Sottile Plum Cultivar Testing in the Western Part of Slovenia N. Fa// and V. Usenik The Plum Cultivar 'Jojo' Grown under the Conditions of the Central Balkan Mountains in Bulgaria B. Stefanova, K. Dragoyski, M. Dinkova and V. Dzhuvinov

5 a Performance of 'Erunosid' and 'Wala' for Plum and Prune Trees M. Sitarek, Z.S. Grzyb and J. Lis - New Polish Seedling Rootstocks 289 New Cultivars and Elites for Plum Culture in Romania 293 M. Botu, G. Achim, J. Botu, S. Preda and A. Baciu Plum Rootstocks for Intensive Plum Culture G. Achim, I. Botu, M. Botu, S. Preda and A. Baciu 'Plovdivska Renkloda' A. Zhivondav New Plum Cultivar 305 Evaluation ofsome Introduced Plum Cultivars in RJMSA Troyan 311 K. Dragoyski, I. Minev, H. Dinknva, T. Stoyanova and P. Minkov Pomological and Chemical Characteristics of Some Bulgarian Plum Cultivars 317 /. Vitanova, S. Dimknva, N. Marinova, D. Ivanovo and H, Kutinkova New Selections of Yellow Japanese Plum Obtained in Florence at the DOF1 321 E. Bellini, V. Nencetti and L Natarelli Japanese and European Plum Cultivar Evaluation in the Po Valley of Italy: Yield and Climate Influence 327 A. Liverani, D. Giovannini, N, Versari, S. Sirri and F. Brandi Pomological Characteristics of Dessert Plum Cultivars in Latvia 337 je". Kaufmcme, L. Jkasa andd. Seglina New Bulgarian Plum Cultivars 345 A. Zhivondov and V. Bozhkova Evaluation of Vigorous and Dwarf Plum Rootstocks in the High Density Orchard in Central Poland 351 Z.S. Grzyb, M. Sitarek and E. Rozpara Fruit Quality and Productivity Evaluation of Nine Plum Cultivars 357 //. Janes, K. Kelt, K. Kahu, L. Kiaas, A. Kika.s and P. Ardel General Topics Plum Culture in Romania: Present Situation and Perspectives 365 /. Botu, M Botu, G. Achim and A. Baciu Plum Production in Bulgaria 373 /. Vitanova, N. Marinova, D. Ivanovo, S. Dimkova and H. Kutinkova Japanese Plum (Primus salicina Lindl.) Production in Extremadura (Spain) 377 M.E. Gueira, J. Rodrigo, A. Wimsch andm. Lopez-Corrales 10

M. Butac, V. Bozhkova, A. Zhivondov, N. Milosevic, E. Bellini, V. Nancetti, J. Blazek, E. Balsemin, B. Lafargue, E. Kaufmane, I. Gravite, M.

M. Butac, V. Bozhkova, A. Zhivondov, N. Milosevic, E. Bellini, V. Nancetti, J. Blazek, E. Balsemin, B. Lafargue, E. Kaufmane, I. Gravite, M. Vasiljeva, M. Pintea, A. Juraveli, T. Webster, I. Hjalmarsson,