Identifying roles of the scion and the rootstock in regulating plant development and functioning under different phosphorus supplies in grapevine

摘要: Abstract Phosphorus is essential for plant life and plants have developed numerous strategies to maximise phosphate (Pi) acquisition use under limited Pi supply. Here we used reciprocal grafting determine whether the shoot root different roles in regulating some of these strategies. Reciprocal grafts two grapevine genotypes (Vitis vinifera cv. Pinot noir V. berlandieri x rupestris 1103 Paulsen) were produced as well corresponding homo-graft controls; grown hydroponic culture subjected levels supply (high (0.6 mM) or low (0.001 mM)). Biomass accumulation, morphology, root, stem leaf organic acid, phosphate, nitrate sulphate concentrations measured. The transcript abundance orthologues known starvation induced (PSI) genes from Arabidopsis was also quantified. Under high Pi, scion genotype had a large impact on growth, but morphology roots (such tip density) not affected. Low affected tissue acid concentration, activity phosphatases released by expression PSI genes. Rootstock showed differences responses supply, exerted long-distance regulation rootstock example, modifying gene expression, efficiency, concentrations. This work shows first time that differ their response can modify nutrient availability. highlights genetic variation shoot-borne signals regulate understanding environment must be done considering influence.