Phenotyping progenies for complex architectural traits: a strategy for 1-year-old apple trees (Malus x domestica Borkh.)

The aim of this study was to define a methodology for describing architectural traits in a quantitative way on tree descendants. Our strategy was to collect traits related to both tree structural organization, resulting from growth and branching, and tree form and then to select among these traits relevant descriptors on the basis of their genetic parameters. Because the complexity of tree architecture increases with tree age, we chose to describe the trees in the early stages of development. The study was carried out on a 1-year-old apple progeny derived from two parent cultivars with contrasted architecture. A large number of variables were collected at different positions and scales within the trees. Broad-sense heritability and genetic correlations were estimated and the within tree variability was analyzed for variables measured on long sylleptic axillary shoots (LSAS). These results were combined to select heritable and not correlated variables. Finally, the selection of variables proposed combines topological with geometric traits measured on both trunks and LSAS: (1) on the trunk, mean internode length, and number of sylleptic axillary shoots; (2) on axillary shoots, conicity, bending, and number of sylleptic axillary shoots born at order 3. The trees of the progeny were partitioned on the basis of these variables. The putative agronomic interest of the selected variables with respect to the subsequent tree development is discussed.

[1]  N. Cook,et al.  Characterization of tree architecture in two-year-old apple seedling populations of different progenies with a common columnar gene parent , 2004 .

[2]  E Costes,et al.  Application of architectural analysis and AMAPmod methodology to study dwarfing phenomenon: the branch structure of 'Royal Gala' apple grafted on dwarfing and non-dwarfing rootstock/interstock combinations. , 2003, Annals of botany.

[3]  Y. Lespinasse,et al.  Utilization of pedigree information to estimate genetic parameters from large unbalanced data sets in apple , 1998, Theoretical and Applied Genetics.

[4]  A. Agresti,et al.  Approximate is Better than “Exact” for Interval Estimation of Binomial Proportions , 1998 .

[5]  R. Littell,et al.  Application of approximate variances of variance components and their ratios in genetic tests , 1995, Theoretical and Applied Genetics.

[6]  S. Mehlenbacher,et al.  Heritability, variance components and correlation of morphological and phenological traits in hazelnut. , 2000 .

[7]  Pierre-Eric Lauri,et al.  Genotypic differences in the axillary bud growth and fruiting pattern of apple fruiting branches over several years : an approach to regulation of fruit bearing , 1995 .

[8]  L. Ferguson,et al.  Genetic analyses of phenological traits of pistachio (Pistacia vera L.) , 2003, Euphytica.

[9]  W. G. Hill.  Design and efficiency of selection experiments for estimating genetic parameters. , 1971, Biometrics.

[10]  Zoë A Popper,et al.  Primary cell wall composition of bryophytes and charophytes. , 2003, Annals of botany.

[11]  Christophe Godin,et al.  A Method for Describing Plant Architecture which Integrates Topology and Geometry , 1999 .

[12]  J. Hill,et al.  Quantitative and Ecological Aspects of Plant Breeding , 1997, Plant Breeding.

[13]  Y. Lespinasse,et al.  Breeding apple tree: aims and methods , 1992 .

[14]  L. Spangelo,et al.  Components of genetic variance for plant survival and vigor of apple trees , 2004, Theoretical and Applied Genetics.

[15]  S. R. Searle,et al.  Restricted Maximum Likelihood (REML) Estimation of Variance Components in the Mixed Model , 1976 .

[16]  Christophe Godin,et al.  Measuring and analysing plants with the AMAPmod software , 1997 .

[17]  Johan Keulemans,et al.  Architectural analysis of 1-year-old apple seedlings according to main shoot growth and sylleptic branching characteristics , 2002, Trees.

[18]  Jeremy F Taylor,et al.  Heritability, Genetic and Phenotypic Correlations, and Predicted Selection Response of Quantitative Traits in Peach: II. An Analysis of Several Fruit Traits , 1998 .

[19]  Evelyne Costes,et al.  Development of young pear trees and occurrence of first flowering: A varietal comparison , 2004 .

[20]  H. Grüneberg,et al.  Introduction to quantitative genetics , 1960 .

[21]  G. Jansson,et al.  Use of trait combinations for evaluating juvenile–mature relationships in Picea abies (L.) , 2005, Tree Genetics & Genomes.

[22]  D. Elfving,et al.  Cyclanilide induces lateral branching in apple trees , 2005 .

[23]  M. Y. Kim,et al.  Development of RAPD and SCAR markers linked to the Co gene conferring columnar growth habit in apple (Malus pumila Mill.) , 2003 .

[24]  Ali S. Hadi,et al.  Finding Groups in Data: An Introduction to Chster Analysis , 1991 .

[25]  Pierre-Eric Lauri,et al.  Integration of architectural types in French programmes of ligneous fruit species genetic improvement , 2000 .

[26]  Christophe Godin,et al.  Exploration of a plant architecture database with the AMAPmod software illustrated on an apple tree hybrid family , 1999 .

[27]  C. Gessler,et al.  Mapping quantitative physiological traits in apple (Malus × domestica Borkh.) , 2003, Plant Molecular Biology.

[28]  M. Cooper,et al.  Heritability and Patterns of Inheritance of the Ripening Date of Apples , 1995 .

[29]  D. Huber,et al.  Age–age and trait–trait correlations for Eucalyptus grandis Hill ex Maiden and their implications for optimal selection age and design of clonal trials , 2003, Theoretical and Applied Genetics.

[30]  Chantal Blanc-Pamard,et al.  Ecologie et développement , 1980 .

[31]  Christophe Godin,et al.  AMAPmod v1.8. Introduction and reference manual , 1997 .

[32]  S. Wertheim,et al.  Manual and chemical induction of side-shoot formation in apple trees in the nursery , 1978 .

[33]  P. Lauri,et al.  Apple tree training in France: current concepts and practical implications , 1999 .

[34]  H Sinoquet,et al.  Exploring within-tree architectural development of two apple tree cultivars over 6 years. , 2003, Annals of botany.

[35]  Y Guédon,et al.  Modelling branching patterns on 1-year-old trunks of six apple cultivars. , 2002, Annals of botany.

[36]  N. Weeden,et al.  A DNA Marker for Columnar Growth Habit in Apple Contains a Simple Sequence Repeat , 1997 .

[37]  N. Oraguzie,et al.  Estimation of genetic parameters in a recurrent selection program in Apple , 2001, Euphytica.

[38]  James White,et al.  THE PLANT AS A METAPOPULATION , 1979 .

[39]  Evelyne Costes,et al.  Identification of biomechanical factors involved in stem shape variability between apricot tree varieties. , 2004, Annals of botany.

[40]  H. F. Robinson,et al.  Statistical genetics and plant breeding. , 1963 .

[41]  I. Bos.  Boekbespreking: Théorie de la sélection et amélioration des plantes, A. Gallais. , 1991 .

[42]  C. Mcconchie,et al.  Genetic parameters for yield in macadamia , 2002, Euphytica.

[43]  Yves Caraglio,et al.  Architecture, gradients morphogénétiques et âge physiologique chez les végétaux , 1997 .

[44]  P. D. Reffye,et al.  Modélisation et simulation de l'architecture des végétaux , 1997 .