02854naa a2200325 a 450000100080000000500110000800800410001902400520006010000180011224501270013026000090025730000100026652018370027665000170211365000140213065000280214465300220217265300410219465300430223570000240227870000280230270000290233070000220235970000180238170000180239970000240241770000190244170000210246077300470248121363782021-11-22       2021    bl uuuu     u00u1 u    #d7 ahttps://doi.org/10.1007/s00704-021-03831-62DOI1 aAMARAL, G. C.  aPilocarpus microphyllus seedling growth threatened by climate changeban ecophysiological approach.h[electronic resource]  c2021  a15 p.  aThe climate change endangers many species of the Amazon Forest. An example, in the endangered medicinal species Pilocarpus microphyllus (popularly known as jaborandi). The jaborandi is a natural source of alkaloids used for serious diseases, essential for medical use. However, the potential impacts of climate change on this species are still unknown. Thus, the objective was to evaluate the effect of high temperature and high atmospheric concentrations of CO2, projected to occur with climate change, combined with water stress, on the ecophysiology of jaborandi seedlings. For this, seedlings were exposed to three different climatic scenarios in a controlled environment, characterized as current Amazon: RCP4.5 (current Amazon average temperature +2.5ºC and 538 ppm of [CO2]) and RCP 8.5 (+4.5 °C and 936 ppm of [CO2]). Within each climatic scenario, two levels of irrigation were applied: 90% (well-watered) and 40% (water-stressed) of the substrate water holding capacity. Growth variables, plant water status, fluorescence parameters, and enzymatic antioxidants activity were evaluated. The results showed that the jaborandi seedlings showed greater total dry mass production when grown in the current Amazon with no water stress. The seedlings? growth was negatively affected by the scenarios enriched with CO2, especially RCP 8.5. Climate change scenarios had the greatest negative impact when the seedlings were subject to water stress. Under these scenarios of climate change and water stress, the seedlings allocated more carbohydrates to the root system. The negative effect of water stress on jaborandi physiology and growth was attenuated by the RCP 8.5 scenario. Our results indicated that the predicted climate changes negatively impact ecophysiology jaborandi, being a threat to the extinction of this species.  aWater stress  aJaborandi  aPilocarpus Microphyllus  aClimatic scenario  aEcophysiology of jaborandi seedlings  aHigh atmospheric concentrations of CO21 aPEZZOPANE, J. E. M.1 aNÓIA JÚNIOR, R. DE S.1 aFERNÁNDEZ MARTÍNEZ, M.1 aFONSECA, M. D. S.1 aGIBSON, E. L.1 aTOLEDO, J. V.1 aPEZZOPANE, J. R. M.1 aKLIPPEL, V. H.1 aXAVIER, T. M. T.  tTheoretical and Applied Climatology, 2021.