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Effects of thinning and pruning on shoot and fruit growths of girdled fruit-bearing shoots in two peach tree cultivars ('Big Top' and 'Alexandra')

Abstract : Shoot and fruit growths were investigated in two peach cultivars, a medium maturing ( 'Big Top' ) and an early maturing ( 'Alexandra' ). Experiments were achieved on fruit-bearing shoots (FBS) isolated from the tree by girdling, thinned to one or three fruits and with a steady number of shoots. This shoot growth was either maintained free or stopped by removing their apical bud. The girdled FBS were located on trees subjected to two thinning ( 'Big Top' ) and three pruning ( 'Alexandra' ) treatments. On the girdled FBS, increasing the number of fruits, on the one hand, and stopping shoots growth, on the other hand, stimulated shoot and fruit growths, respectively. These results show that fruit growth does not limit shoot growth but at the opposite contributes to improve it, and that available assimilates are preferentially oriented to shoot growth over fruit growth. By contrast, on the whole tree, shoot growth was found limited under a higher fruit load. A higher fruit load also limited fruit growth and soluble solids content on the whole tree, in similar proportions than those of the girdled FBS. Compared to light pruning, severe pruning induced higher shoot and fruit growths on the whole tree and on the girdled FBS. Fruit growth and quality at maturity are shown highly dependant on the leaf-to-fruit ratio which vary with thinning and pruning intensities.
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https://hal.inrae.fr/hal-02653268
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Submitted on : Friday, May 29, 2020 - 8:51:10 PM
Last modification on : Wednesday, February 10, 2021 - 3:34:52 AM

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  • HAL Id : hal-02653268, version 1
  • PRODINRA : 28167

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Claude Bussi, Francoise Lescourret, Michel Génard. Effects of thinning and pruning on shoot and fruit growths of girdled fruit-bearing shoots in two peach tree cultivars ('Big Top' and 'Alexandra'). European Journal of Horticultural Science, Ulmer, 2009, 74 (3), pp.97-102. ⟨hal-02653268⟩

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