Living yeast-based biostimulants: different genes for the same results?
Data obtained in the "Soja Made in Normandie" project at the  EA4358 Glyco-MEV laboratory of the University of Rouen, France.   Nowadays many products are available on the plant biostimulants market. Among these biostimulants, living yeast-based biostimulants are also commercialized. Given the living aspect of these products, the reproducibility of their effects should be investigated to ensure end-users' confidence in these solutions. This study aimed to compare effects of a living yeast-based bi-ostimulant between two different soybean cultures. These two cultures C1 and C2 were con-ducted on the same variety and soil, but in different locations and dates until VC developmental stage (unifoliate leaves unrolled), with and without biostimulant treatment on seeds. A leaf transcriptomic analysis was conducted in order to characterize the biostimulant effect on these two cultures. This study firstly showed a high gene expression difference between the two cul-tures. Despite this first result, a secondary analysis focusing on the different pathways differen-tially expressed with the biostimulant treatment showed that pathways modulated by the bi-ostimulant treatment were really close between soybean cultures C1 and C2. These results seem to show that the biostimulant effects led to a similar pathway enhancement in plants even if genes expression was different between the two cultures. Pathways which seems to be reproducibly impacted by the living yeast based biostimulant are abiotic stress response, carbohydrate syn-thesis, protein metabolism and glycolysis.