Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/16721
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dc.contributor.authorShimpl, Flávia Camila-
dc.contributor.authorFerreira, Marciel José-
dc.contributor.authorJaquetti, Roberto Kirmayr-
dc.contributor.authorMartins, Samuel Cordeiro Vitor-
dc.contributor.authorGonçalves, José Francisco de Carvalho-
dc.date.accessioned2020-06-15T21:35:56Z-
dc.date.available2020-06-15T21:35:56Z-
dc.date.issued2019-
dc.identifier.urihttps://repositorio.inpa.gov.br/handle/1/16721-
dc.description.abstractThe Brazil nut tree (Bertholletia excelsa Bonpl.) is widely distributed in the Amazon region. It is subject to different rainfall regimes, particularly in El Niño years. Here, we demonstrate how biomass growth, gas exchange and biochemical traits of young B. excelsa plants were affected by imposed drought stress and subsequent rehydration. Four-month-old young plants were acclimated in a greenhouse for 15 days and received daily irrigation, after this period they were separated into two treatment: well-watered (control plants, WW) and water deficit (drought-stressed plants, DS). After 58 days of water deficit, the net photosynthetic rate (P n ) of the plants in the DS treatment regime reached values close to zero, water use efficiency significantly increased, and midday leaf water potential (Ѱ leaf ) reached a mean value of −4.7 MPa. The recovery of P n and Ѱ leaf to control levels was re-established after 16 days of rehydration. The DS treatment regime led to lower level of biomass (37%) when compared to plants in the WW treatment regime. The DS treatment plants had higher leaf concentrations of total soluble sugars, whereas the starch content was higher in the WW treatment regime. Our results suggest that (i) B. excelsa has a high physiological plasticity with respect to drought stress and (ii) the recovery of physiological traits was followed by the recovery of the absolute growth rates of the DS plants in the short term. These ecophysiological responses demonstrate the strong potential of this species for establishment in forest plantations in the Amazon region and its resilience during drought events. © 2019 Elsevier GmbHen
dc.language.isoenpt_BR
dc.relation.ispartofVolume 252, Pags. 10-17pt_BR
dc.rightsRestrito*
dc.subjectAnatomyen
dc.subjectBiochemistryen
dc.subjectBiomassen
dc.subjectCarbohydrateen
dc.subjectDrought Stressen
dc.subjectEcophysiologyen
dc.subjectEl Nino-southern Oscillationen
dc.subjectEvergreen Treeen
dc.subjectGas Exchangeen
dc.subjectGrowthen
dc.subjectGrowth Rateen
dc.subjectLeafen
dc.subjectPhenotypic Plasticityen
dc.subjectPhysiological Responseen
dc.subjectRainfallen
dc.subjectYoung Populationen
dc.subjectAmazoniaen
dc.subjectBrasilen
dc.subjectBertholletia Excelsaen
dc.titlePhysiological responses of young Brazil nut (Bertholletia excelsa) plants to drought stress and subsequent rewateringen
dc.typeArtigopt_BR
dc.identifier.doi10.1016/j.flora.2019.02.001-
dc.publisher.journalFlora: Morphology, Distribution, Functional Ecology of Plantspt_BR
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