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AOBPreview originally published online on March 28, 2003
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Annals of Botany 91: 665-672, 2003
© 2003 Annals of Botany Company

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

A. N. SELEZNYOVA1, T. G. THORP2, M. WHITE3, S. TUSTIN3 and E. COSTES4

1 The Horticulture and Food Research Institute of New Zealand Ltd, Palmerston North Research Centre, Private Bag 11030, Palmerston North, New Zealand, 2 The Horticulture and Food Research Institute of New Zealand Ltd, Mt Albert Research Centre, Private Bag 92169, Auckland, New Zealand, 3 The Horticulture and Food Research Institute of New Zealand Ltd, Hawke’s Bay Research Centre, Private Bag 1401, Havelock North, New Zealand and 4 UMR BDPPC, Architecture et Fonctionnement des Espèces Fruitères, INRA, 2, place Viala, 34060 Montpellier Cedex 1, France

* For correspondence. Fax +64 6 3546731, e-mail aseleznyova{at}hortresearch.co.nz

Received: 2 October 2002; Returned for revision: 5 December 2002; Accepted: 3 February 2003    Published electronically: 28 March 2003

Architectural analysis was applied to study branch development of ‘Royal Gala’ apple trees grafted with dwarfing and non-dwarfing rootstock/interstock combinations, which had been chosen to produce trees with a wide range of vigour. Using AMAPmod methodology, the structure of 3-year-old branches was described at four levels of representation: branch; annual shoot; growth unit; and node. Three types of growth units were distinguished: extension growth unit (vegetative unit with internode extension); vegetative spur with minimal internode extension; and fruiting spur or bourse. The aim of the analysis was to describe exactly how the rootstock/interstock combinations affected the structure building process. The number of extension growth units, vegetative spurs and fruiting spurs per annual shoot changed over the years, but this was not affected by rootstock/interstock combination. Compared with MM.106 rootstock, M.9 rootstock reduced the number of nodes per extension growth unit. In most cases, rootstock/interstock combination had no effect on the linear relationship between extension growth unit length and node number (R2 = 0·88). Average internode length depended on unit node number, with internodes being shorter for units with fewer nodes. Thus the difference in apple branch size induced by the rootstock/interstock combinations was mainly due to a reduction in the length and number of neoformed nodes produced on extension growth units. As percentage budbreak of axillary buds on extension growth units was not affected by rootstock/interstock combination, differences in numbers of axillary annual shoots per branch were entirely due to differences in the total numbers of nodes extended during the previous year.

Key words: Malus domestica Borkh, plant architecture, modelling, growth unit, rootstock, dwarfing, internode length, node number, neoformation.


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