# Transcriptomic comparison between deflowered and overloaded apple trees: toward the understanding of biennial bearing in apple

Baptiste Guitton, Jean-Jacques Kelner, Jean-Marc Celton, Jean-Pierre Renou, Fernando Andrés, David Chagne, Evelyne Costes

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## To cite this version:

Baptiste Guitton, Jean-Jacques Kelner, Jean-Marc Celton, Jean-Pierre Renou, Fernando Andrés, et al. Transcriptomic comparison between deflowered and overloaded apple trees: toward the understanding of biennial bearing in apple. 8. International Rosaceae Genomics Conference (RGC8), Jun 2016, Angers, France., 2016. hal-01604607

HAL Id: hal-01604607

https://hal.science/hal-01604607

Submitted on 3 Jun 2020

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# Transcriptomic comparison between deflowered and overloaded apple trees: toward the understanding of biennial bearing in apple

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Baptiste Guitton<fnref n="1" />, Jean-Jacques Kelner<fnref n="2" />, Jean-Marc Celton<fnref n="3" />, Jean-Pierre Renou<fnref n="3" />, F. Andrés<fnref n="4" />, David Chagné<fnref n="5" />, Evelyne Costes<fnref n="1" />

Under the assumption that flower induction is inhibited in the trees carrying heavy fruit load or induced by the absence of fruit, we artificially placed in situation of alternation adult apple trees of the Gala variety to study the differentially expressed genes in their apical meristems, from the period of floral induction to floral differentiation. Analysis of these genes by qRT-PCR and microarray enabled to identify the key biological processes involved. Indeed, classes of differentially expressed genes suggest that the meristems are in contrasting physiological states resulting from various metabolic, hormonal and redox states. In addition, several genes known to be involved in the control of floral induction, such as TEMPRANILLO (TEM1), FLORAL TRANSITION AT MERISTEM (FTM1) and SQUAMOSA PROMOTER BINDING PROTEIN-LIKE (SPL) were differentially expressed.

These results represent a foundation toward the understanding of molecular processes leading to the inhibition vs. promotion of floral induction in fruiting trees.

<footnote n="1">¹INRA, UMR AGAP, CIRAD-INRA-SupAgro, AFEF team, TA 108/03, Avenue Agropolis, 34398 Montpellier CEDEX 5, France</footnote>

<footnote n="2">²SupAgro, UMR AGAP, CIRAD-INRA-SupAgro, AFEF team, TA 108/03, Avenue Agropolis, 34398 Montpellier CEDEX 5, France</footnote>

<footnote n="3">³INRA, UMR1345 IRHS, Institut de Recherche en Horticulture et Semences, AgroCampus-Ouest-INRA-QUASAV, PRES L'UNAM, 49071 Beaucouzé, France</footnote>

<footnote n="4">⁴Max Planck Institute for Plant Breeding Research, D-50829 Cologne, Germany</footnote>

<footnote n="5">⁵The New Zealand Institute for Plant & Food Research Limited, Private Bag 11600, Palmerston North, 4442, New Zealand</footnote>