02300naa a2200289 a 450000100080000000500110000800800410001902400380006010000260009824501280012426000090025252014120026165000130167365000130168665000280169965300330172765300190176065300080177965300340178765300230182165300180184470000190186270000160188170000190189770000190191677300750193520101012016-05-30       2015    bl uuuu     u00u1 u    #d7 a10.1590/0102-33062014abb34202DOI1 aOLIVEIRA, J. R. G. de  aResponse of an endangered tree species from Caatinga to mycorrhization and phosphorus fertilization.h[electronic resource]  c2015  aSchinopsis brasiliensis is an endangered tree species found in the Caatinga biome. It presents a characteristic slow development and difficult propagation, although it has been traditionally exploited in the region. Application of arbuscular mycorrhizal fungi (AMF) and phosphorus (P) fertilization may be beneficial to S. brasiliensis development at the seedling stage, which at the same time may help species conservation and the recovery of degraded areas in the Caatinga biome. We assessed the response of S. brasiliensis to AMF inoculation (Claroideoglomus etunicatum and Acaulospora longula) and P fertilization (0, 12, 24, and 48 mg dm −3 addition of P 2 O 5 ). S. brasiliensis responded positively to both AMF inoculation and P fertilization. At low P concentrations, the inoculated plants showed higher leaf area and enhanced vegetative development, nutrient content and biomass production compared with non-inoculated plants. Conversely, increasing levels of P fertilization decreased the level of mycorrhizal colonization, plant responsiveness to inoculation, and spore production in C. etunicatum . Thus, P concentrations were able to influence the response of S. brasiliensis to mycorrhization and responsiveness to increased mycorrhization with the decrease in P availability. These results showed that mycorrhizal symbiosis plays an essential role in the development of S. brasiliensis.  aBaraúna  aCaatinga  aSchinopsis Brasiliensis  aArbuscular Mycorrhizal fungi  aCaatinga biome  aFMA  aFungo micorrízico arbuscular  aPlanta da Caatinga  aPlanta nativa1 aSILVA, E. M. e1 aRIOS, T. T.1 aMELO, N. F. de1 aMELO, A. M. Y.  tActa Botanica Brasilica, Belo Horizontegv. 29, n. 1, p. 94-102. 2015.