S16 - Session O3 - Growth unit characteristics and light environment affect leaf fall in the evergreen mango tree

Authors: Emma Carrié *, Isabelle Grechi, Frédéric Boudon, Elzbieta Frak, Frédéric Normand, Didier Combes

Foliage distribution is an important feature of tree functioning. Leaves of mango tree, a tropical evergreen tree, remain on the tree for several years. Unlike deciduous trees whom all leaves fall yearly during winter, leaf fall process for evergreen trees is more complex to predict.The objective of this work was to identify the structural and environmental factors affecting the dynamics of leaf fall at the growth unit (GU) scale during on year. In January 2021, 240 GUs were sampled on five adult mango trees of the cultivar 'Cogshall' at three ranks expressed in number of GUs from the terminal GU in the branches (1, 2 and 4 GUs) and two positions with respect to the previous GU (apical or lateral). GU rank is used as a proxy for GU age. The numbers of nodes and remaining leaves were counted for each GU. The gap fraction and the average daily amount of transmitted light were estimated for each GU from hemispherical photographs. Then, during on year, up to January 2022, the number of leaves per GU was counted every month. The results showed that the number of leaves remaining in January 2021 was significantly affected by the GU rank and length. Leaf fall probability between GU appearance and January 2021 increased with GU rank (0.11, 0.22 and 0.39 for rank 1, 2 and 4 respectively). From January 2021 to January 2022, leaf fall was continuous, but not regular, with less leaf fall during the cool and dry season from May to September 2021. Analyses at the GU scale showed that the GU rank and the month, but not the light environment, affected leaf fall. The results suggested that leaf fall was mostly related to the tree phenological stage. 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