Photochemical efficiency, biomass and chlorophyll of phyális under salinity and biostimulant

Physalis peruviana L. has great exploitation potential especially for small producers in the Brazilian Northeast. However, production semiarid regions may be limited by high salt content soils and water sources used irrigation. Thus, this study evaluated application of Ascophyllum nodosum seaweed extract as saline stress attenuator P. The randomized block design was used, an incomplete 5 × factorial scheme, with five electrical conductivities irrigation (0.50, 1.23, 3.00, 4.77 5.50 dS m-1) increasing concentrations kelp (0.00, 1.45, 5.00, 8.55 10.00 mL L-1), nine combinations generated Central Box matrix, four replicates plants to evaluate effect on phytomass accumulation, chlorophyll fluorescence pigment content. Results showed, salinity significantly reduced biomass indices. when were treated 9.9 L-1 they increased seedling quality. On other hand, up 4.1 L-1, biostimulant dark-adapted indices which indicate it reduces damages photosynthetic apparatus caused salt-stress thus improving activity photoassimilates production. Thus A. attenuates deleterious photosynthesis plants.