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O-54 The study of triploid progenies from crosses between diploid and tetraploid grapes L. Sun*, A.L. Yan, G.J. Zhang, W. Wang, H.Y. Xu Institute of Forestry and Pomology, Beijing Academy of Agricultural and Forestry Science, Beijing, China *Corresponding author: sunlei.bjfu@gmail.com Crossing of plants with different ploidys is one of the effective ways to obtain new seedless cultivars. In this paper, through testing the changes of the ovule weight and observing its anatomical structure, the period and mode of ovule abortion in crosses between diploid and tetraploid grape cultivars were studied and reciprocal crossing was also conducted between them. The results indicated that the proper sampling period is one of the most important factors in ovule culture, and unlike in seedless cultivars, the embryo abortion did not occur at the same time for most seeded cultivars crossed with different ploidy plants, but the ovule abortion was only individual behavior. The period of ovule abortion was correlated with the maturing period of the female parent. The abortive embryo of early-maturing cultivars occurred at five weeks after pollination, and the mid-maturing ones and late-maturing ones were at six and nine weeks after pollination, respectively. The reciprocal crossing results showed that this crossing form has great mating obstruction, and the situation was more serious when tetraploid cultivars were used as the female parent. Very few seeds from 2X × 4X had good germinability, while those from 4X × 2X lost their germinability and no seedlings were obtained. The highest germination rate and seedling survival rate were obtained when the ovule was excised 60 days after pollination, and it is easier to harvest hybrid progeny when using diploid as female parent. 75 
O-55 Characteristics of promising muscadine grape (Vitis rotundifolia Michx.): Selections from the University of Georgia (U.S.A) breeding program Patrick Conner* Horticulture Department, Coastal Plain Experiment Station, University of Georgia, Tifton, Georgia, USA Corresponding author: pconner@uga.edu Muscadine grapes have been cultivated commercially in the southeastern United States since the middle of the 18th century for both fresh consumption and wine and juice production. The University of Georgia operates the oldest and largest breeding program dedicated to the improvement of the muscadine grape. Current goals of the breeding program include the development of new cultivars which combine large berry size with perfect flowers, earlier and later maturing cultivars, berries with dry stem scars and edible skins, and increased cold hardiness. Details of eight new selections in comparison to standard cultivars are given in this paper. Five selections are targeted towards conventional fresh market production, two for organic production, and one for home garden and pick-your-own production. Three of the most promising selections; Ga. 1-1-48 (‘Fry’ × ‘Tara’), Ga. 5-1-38 (‘Supreme’ × ‘Tara’) and Ga. 5-1- 45 (‘Supreme’ × ‘Tara’), are on track to be released as cultivars in the next three years. These three selections are suitable for commercial production because they have self-fertile flowers, large berry size, and a high percentage of dry stem scars. 76 
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Date Time Session Topic Sunday Augu
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Monday August 2, 2010 Opening Plena
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Topic: Adaptation to soils and clim
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Tuesday August 3, 2010 Oral Session
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Poster Session 2 1:30 PM-3:00 PM Po
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P-105 Pathogen responsiveness and v
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Table of Contents Keynote Presentat
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K-2 Progress in grapevine breeding
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K-4 Genetics and Genomics of Grapev
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O-2 Additional homologs of the Ren1
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O-4 Y. Xu and Y.Wang* Introduction
Page 23 and 24: O-5 Identification of an R2R3 MYB t
Page 25 and 26: O-7 Sequencing of the phylloxera re
Page 27 and 28: O-9 Dissection of defense pathways
Page 29 and 30: O-11 Recent trends and technologies
Page 31 and 32: O-13 Brazilian Grape Breeding Progr
Page 33 and 34: O-15 Development of rootstocks for
Page 35 and 36: O-17 L. Wang* 1 , S. Li 1, 2 , P. F
Page 37 and 38: O-19 Integrated analysis of transcr
Page 39 and 40: O-20 Deciphering the chromosome str
Page 41 and 42: O-22 Identification of table grapes
Page 43 and 44: O-24 Metagenomic sequencing as a to
Page 45 and 46: O-26 Regulation of bud fruitfulness
Page 47 and 48: O-28 Haplotype structure and cluste
Page 49 and 50: O-30 Annette Nassuth Function of Vi
Page 51 and 52: 10 to 25% of the chlorotic symptoms
Page 53 and 54: O-34 Cloning and characterization o
Page 55 and 56: O-36 New insight into the genetics
Page 57 and 58: O-38 Co-Localization of QTLs for Se
Page 59 and 60: O-40 Quantitative analysis of textu
Page 61 and 62: O-42 Transcriptional changes in res
Page 63 and 64: O-44 The Turkish grape (Vitis vinif
Page 65 and 66: Association genetics in relation wi
Page 67 and 68: O-47 Intravarietal variability of C
Page 69 and 70: O-49 Molecular survey of Georgian t
Page 71 and 72: O-51 Marker-assisted breeding: Iden
Page 73: O-53 An Integrated approach to stud
Page 77 and 78: P-2 PMEI and SPY: Two genes with po
Page 79 and 80: P-4 Gene-assisted selection for tab
Page 81 and 82: P-6 Polyphenolic potential of the r
Page 83 and 84: P-8 Monoterpene levels in different
Page 85 and 86: P-10 Usefulness of the SCC8 scar ma
Page 87 and 88: P-12 The onset of berry ripening is
Page 89 and 90: P-14 Morphological characteristics
Page 91 and 92: P-16 A genetic analysis of berry qu
Page 93 and 94: P-18 Use of molecular markers for s
Page 95 and 96: P-20 Characterization of key compon
Page 97 and 98: P-22 Expression of early light-indu
Page 99 and 100: P-24 The development of molecular m
Page 101 and 102: P-26 Identification of ABA inducibl
Page 103 and 104: P-28 In vitro selection of HYP tole
Page 105 and 106: P-30 In silico SNP detection for ge
Page 107 and 108: P-32 Vitis vinifera genome annotati
Page 109 and 110: P-34 Genome-wide identification of
Page 111 and 112: P-36 Looking for genetic polymorphi
Page 113 and 114: P-38 Characterization of a new horm
Page 115 and 116: P-40 Towards a characterization of
Page 117 and 118: the overall identified polymorphism
Page 119 and 120: P-43 Proteomic characterization of
Page 121 and 122: P-45 Preliminary observations on th
Page 123 and 124: grapevine which will eventually be
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P-48 ‘Cioutat’: a somatic varia
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P-50 Estimation of protein spot var
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glucosyltransferase, anthocyanidin
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P-53 Marker-free transgenic grapevi
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P-55 Agrobacterium rhizogenes-media
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P-57 Phenotypic evaluation of ‘Th
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P-59 Phenotypic divergence among gr
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P-61 Grepevine variety determinatio
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agricultural context. This network
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P-64 Genetic structure in a large r
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P-66 Analysis of grape rootstocks b
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P-68 Italian wild grapevine: a stat
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Rebula-Robola group were genotyped
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P-71 Viticultural performance of so
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P-73    Molecular characterizat
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P-75 Variation of berry polyphenoli
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P-77 Morphological and molecular id
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P-79 Studies on an excellent, early
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P-81 Effectiveness of different cul
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P-83 Some early maturing table grap
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P-85 New triploid seedless table gr
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P-87 Grape breeding and viticulture
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P-89 The usefulness of allotetraplo
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P-91 Drying rate of fresh berries f
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P-93 Development of table and raisi
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P-95 Reaction of grape rootstocks t
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P-97 Genetic analysis of the resist
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P-99 Berry cracking caused powdery
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P-101 Elicitation of grapevine defe
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P-103 The biological characteristic
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P-105 Pathogen responsiveness and v
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P-107 Screening grape hybrid famili
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P-109 Characterization of an ankyri
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P-112 Evaluation of grapevine germp
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P-114 Evaluation of four new rootst
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