Characterization of water deficit tolerance of Poncirus trifoliata genotypes related to diversity

Ben Yahmed Jihane, Costantino Gilles, Ben Mimoun Mehdi, Talon Manuel, Ollitrault Patrick, Morillon Raphaël, Luro François. 2015. Characterization of water deficit tolerance of Poncirus trifoliata genotypes related to diversity. In : Proceedings of the XIIth International Citrus Congress: International Society of Citriculture. Navarro Luis (ed.), Sabater-Muñoz Beatriz (ed.), Moreno Pedro (ed.), Peña Leandro (ed.). ISHS. Leuven : ISHS, 1379-1384. (Acta Horticulturae, 1065) ISBN 978-94-62610-53-8 International Citrus Congress: Citrus and Health. 12, Valence, Espagne, 18 Novembre 2012/23 Novembre 2012.

http://www.actahort.org/books/1065/1065_174.htm

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Résumé : Rootstock provides better adaptation to biotic and abiotic constraints. Poncirus and its hybrids are widely used since they are tolerant to Citrus Tristeza Virus. However, when grafted, most of them are considered to be sensitive to salinity and water deficit. Diversity does exist within the Poncirus trifoliata specie but little is known regarding the behaviour variability of genotypes to abiotic constraints. The citrus diversity of 72 P. trifoliata genotypes was investigated using SSR markers. Two mayor genetic groups were clearly identified. Five genotypes, belonging to each genetic group, were then selected to investigate their properties of tolerance to water deficit. Water deficit was applied by withdrawing irrigation for 4 weeks. Physiological parameters such leaf stomatal conductance and quantum yield of PSII electron transport, soil water potential, leaf osmotic pressure and transpiration were estimated. Among genotypes, we observed that some genotypes such as' Rubidoux' were clearly more tolerant to water deficit than others such as 'Pomeroy'. Interestingly, the genotypes that were sensitive belonged to one genetic group and the tolerant ones belonged to the other group. Therefore, it sounds that among the Poncirus genus, it is possible to select genotypes as parent in breeding programs, which are more tolerant to water deficit.

Classification Agris : F30 - Génétique et amélioration des plantes
F60 - Physiologie et biochimie végétale
H50 - Troubles divers des plantes

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