
Potential contribution of strigolactones in regulating scion growth and branching in grafted grapevine in response to nitrogen availability
Author(s) -
Noé Cochetel,
Eloïse Météier,
Isabelle Merlin,
Cyril Hévin,
JeanBernard Pouvreau,
Pierre Coutos-Thévenot,
Michel Hernould,
Philippe Vivin,
Sarah Jane Cookson,
Nathalie Ollat,
Virginie Lauvergeat
Publication year - 2018
Publication title -
journal of experimental botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.616
H-Index - 242
eISSN - 1460-2431
pISSN - 0022-0957
DOI - 10.1093/jxb/ery206
Subject(s) - rootstock , strigolactone , biology , shoot , arabidopsis , cutting , botany , gene , mutant , genetics
In grafted plants, rootstocks assure the mineral nutrition of the scion and modify its development. In this study, we show that two grapevine rootstock genotypes have different shoot branching architectures when cultivated as cuttings and that this trait is transmitted to the scion when grafted. Shoot branching plasticity in response to nitrogen supply was also studied. As strigolactones are known to have a role in the regulation of shoot development in response to nutrient availability, their involvement in the control of scion architecture by the rootstock was investigated. Functional characterization of putative grapevine strigolactone biosynthetic genes in Arabidopsis mutants or grapevine cell suspensions showed similar functions to those of Arabidopsis. Both rootstocks produced strigolactone-like compounds; the quantity produced in response to nitrogen treatments differed between the two rootstock genotypes and correlated with the expression of putative strigolactone biosynthetic genes. Exudation of strigolactone-like compounds by both rootstocks was closely related to the developmental pattern of the scion in grafted plants. These results suggest that differential regulation of strigolactone biosynthesis in response to nitrogen availability may contribute to the control of scion development conferred by each rootstock genotype.