@Article{CamargosAntunesRźMeOmJaPo:2016:SpTuTr,
author = "Camargos Antunes, Werner and R{\^e}go Mendes, Keila and Melo
Chaves, Agnaldo Rodrigues de and Ometto, Jean Pierre Henry Balbaud
and Jarma-Orozco, Alfredo and Pompelli, Marcelo Francisco",
affiliation = "{Universidade Estadual de Maring{\'a} (UEM)} and {Universidade
Federal de Pernambuco (UFPE)} and {Empresa Brasileira de Pesquisa
Agropecu{\'a}ria (EMBRAPA)} and {Instituto Nacional de Pesquisas
Espaciais (INPE)} and {University of C{\'o}rdoba} and
{Universidade Federal de Pernambuco (UFPE)}",
title = "Spondias tuberosa trees grown in tropical, wet environments are
more susceptible to drought than those grown in arid
environments",
journal = "Revista Colombiana de Ciencias Horticolas",
year = "2016",
volume = "10",
number = "1",
pages = "9--27",
month = "ene.-jun.",
keywords = "Caatinga, composici{\'o}n isot{\'o}pica del carbono, cambio
clim{\'a}tico, limitaciones no estom{\'a}ticas, umbuzeiro,
estr{\'e}s h{\'{\i}}drico.",
abstract = "In this study, we investigated the different responses of Spondias
tuberosa (umbu) trees, which grow in two different ecological life
zones in northeast Brazil: tropical wet and tropical arid
ecosystems. We evaluated the responses of plants grown under humid
and dry conditions by measuring the photosynthesis, water status,
fluorescence parameters, carbon isotopes and antioxidant system
activity. The higher net photosynthesis values were recorded
contemporaneously with the lower VPD values. The highest
internal-to-ambient CO2 concentration and the absence of typical
changes in the fluorescence parameters suggested an onset of a
nonstomatal limitation in the photosynthesis. Our results showed
that umbu plants can adjust their antioxidant activity during the
dry season as a defensive strategy against the deleterious effects
of water stress. This evidence is supported by the observed
modifications in the pigment concentrations, increased
accumulation of hydrogen peroxide and malondialdehyde, high levels
of electrolyte leakage, increased antioxidant activity, and
decreased carbon isotope discrimination in the umbu trees during
the dry season. Supported by multivariate analysis of variance,
significantly effect of interaction between categorical months of
collect and location predicts a strong dry season effect on our
dataset. Taken together, our data show that umbu trees grown in a
wet tropical environment are more susceptible to drought, as
compared with their tropical arid counterparts. RESUMEN: En este
trabajo se investigaron las respuestas de {\'a}rboles de Spondias
tuberosa (umbu), que crecen en dos zonas ecol{\'o}gicas del
nordeste de Brasil: h{\'u}meda tropical y {\'a}rida tropical. Se
evaluaron las respuestas de las plantas con base en
fotos{\'{\i}}ntesis, estado h{\'{\i}}drico, par{\'a}metros de
fluorescencia, isotopos de carbono y actividad del sistema
antioxidante. Los altos valores de las tasas de
fotos{\'{\i}}ntesis fueron correlacionados con bajos valores del
DPV; los altos niveles de concentraci{\'o}n interna de CO2 y la
ausencia de cambios t{\'{\i}}picos en los par{\'a}metros de
fluorescencia, sugieren la aparici{\'o}n de una limitaci{\'o}n
no estom{\'a}tica de la fotos{\'{\i}}ntesis. Los resultados
indicaron que las plantas de umbu pueden ajustar su actividad
antioxidante durante la estaci{\'o}n seca como una estrategia de
defensa ante los efectos perjudiciales de un estr{\'e}s por
sequ{\'{\i}}a. Esta afirmaci{\'o}n est{\'a} soportada por las
modificaciones observadas en la concentraci{\'o}n de pigmentos,
incrementos en la acumulaci{\'o}n de per{\'o}xido de
hidr{\'o}geno y malondialdehido, altos niveles de electrolitos
libres, incremento de la actividad antioxidante y decrecimientos
en la discriminaci{\'o}n isot{\'o}pica del carbono en la
localidad {\'a}rida. El an{\'a}lisis de varianza multivariado
mostr{\'o} efectos significativos para la interacci{\'o}n mes de
colecta y localidad, lo cual fue fuertemente predecible en la
localidad. El an{\'a}lisis integral de los datos demostr{\'o}
que los {\'a}rboles de umbu que crecieron en un ambiente
h{\'u}medo tropical, son m{\'a}s susceptibles a la
sequ{\'{\i}}a, comparados con su contraparte de ambientes
{\'a}ridos tropicales.",
doi = "10.17584/rcch.2016v10i1.4456",
url = "http://dx.doi.org/10.17584/rcch.2016v10i1.4456",
issn = "2011-2173",
label = "lattes: 1325667605623244 4
CamargosAntunesR{\^e}RoOmJaPo:2016:\&lTuTr",
language = "pt",
targetfile = "camargos_spondias.pdf",
urlaccessdate = "27 abr. 2024"
}