Exploring bud dormancy completion with a combined architectural and phenological analysis: the case of the apple tree in contrasting winter temperature conditions

Abstract : • Premise of the study: The branching pattern and phenology of trees result from interactions between the tree’s genetic constitutionand environmental conditions. Temperature strongly affects the duration of bud dormancy and further shoot growth. Ourhypothesis was that shoot architecture is strongly affected by winter temperatures determining both the position and budburstof vegetative laterals with a lower effect on their outgrowth.• Methods: The study was conducted on four apple cultivars characterized by various chilling requirements and grown in twocontrasting winter temperature conditions. A two-step approach was designed to quantify at the shoot scale fi rst the branchingpattern and second two phenological stages of vegetative laterals, budburst and outgrowth. A categorical variable, the branchingzone, was built to summarize the lateral position along the shoot. It was integrated into the phenological analysis as a factortogether with the cultivar and the winter temperature.• Key results: Temperature had a main effect on the distribution of vegetative laterals along the shoot. It also strongly affectedbudburst, which was also affected by the cultivar and the branching zone. The outgrowth of the lateral was not signifi cantlyaffected by temperature but was signifi cantly affected by the cultivar and the branching zone. Furthermore, the delayed senescenceand subsequent leaf persistence during winter, characterizing the apple tree in the mild winter temperature condition, hadonly a weak effect on the distribution of vegetative laterals and on budburst and lateral outgrowth.• Conclusions: The actual shoot architecture and budburst result from an ordered sequence of events with a pivotal role of wintertemperatures on the dormancy completion of individual lateral buds. Endogenous factors related to the cultivar branchingpattern overtake the temperature effect on the lateral outgrowth.
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American Journal of Botany, Botanical Society of America, 2014, 101, pp.398 - 407. 〈10.3732/ajb.1300335〉
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Soumis le : mardi 2 décembre 2014 - 08:43:05
Dernière modification le : samedi 27 janvier 2018 - 01:30:40

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Juliano Dutra Schmitz, Yann Guédon, Flavio Gilberto Herter, Gabriel Berenhauser Leite, Pierre-Eric Lauri. Exploring bud dormancy completion with a combined architectural and phenological analysis: the case of the apple tree in contrasting winter temperature conditions. American Journal of Botany, Botanical Society of America, 2014, 101, pp.398 - 407. 〈10.3732/ajb.1300335〉. 〈hal-01089580〉

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