Effects that nutritional and saline gradients have on the growth of Passiflora mucronata Lam. and Canavalia rosea (Sw.) DC. found in the restinga of Brazil

Lourenço, Jehová; Zambom, Oberdan; Rossi, Magda Santos; Cuzzuol, Geraldo Rogério Faustini

doi:10.1590/s0102-33062013000200008

Cited by 7 publications

(3 citation statements)

References 34 publications

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“…Studies related to the effect of salt on different stages of development in some Passiflora species indicated that they can be considered as moderately tolerant to salinity stress (e.g. Loureiro Soares et al, 2002;Casierra-Posada et al, 2011;Lourenço Junior et al, 2013;Marler, 2013;Montaña et al, 2014). Nevertheless, only few of them addressed the response to salinity during seed germination and early seedling growth, with little or no knowledge of the relevance of the antioxidant metabolism in this process.…”

Section: Introductionmentioning

confidence: 99%

Germinability and antioxidant metabolism in Passiflora caerulea L. seeds exposed to salt stress

Chaín,

Causin

2108

MACN

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P. caerulea is the Passiflora species with the widest distribution in Argentina. Despite the need to cultivate it to decrease the extraction impact on its natural populations, the information on how environmental factors affect seed germinability is scarce. In order to evaluate the greminative response and the role of the antioxidant metabolism against saline stress, freshly collected seeds were germinated at 26° C in the presence of 0 (control), 30, 60 or 90 mM NaCl. The percentage of germination, the content of soluble and carbonylated proteins, the activity of antioxidant enzymes and the generation of reactive oxygen species both in the pre-germination phase and during germination were evaluated. The removal of the aryl and the micropylar integument after 3 h imbibition proved to induce a rapid germination and activation of the enzymes catalase, glutathione S-transferase and peroxidases, together with an increase and a decrease in the generation of O 2 and H 2 O 2 , respectively, at the root apex. Even though the germination and activity of some of the studied enzymes decreased with the increase in external NaCl levels, when comparing populations of the control and 90 mM NaCl treatments having similar germination percentages, a marked induction of peroxidase activity was observed in the latter group. The proportion of carbonylated proteins did not differ among treatments, which suggests that, despite this species cannot be considered as halo-tolerant, the fact that the antioxidant metabolism efficiently contributed to prevent oxidative damage to the proteome may constitute an important mechanism to facilitate its establishment in environments with moderate salinity.Resumen: Germinabilidad y metabolismo antioxidante en semillas de Passiflora caerulea L. expuestas a estrés salino. P. caerulea es la especie Passiflora con más amplia distribución en Argentina. Si bien es necesario implementar prácticas de cultivo para disminuir el impacto debido a su extracción indiscriminada, la información sobre cómo los factores ambientales afectan la germinabilidad de sus semillas es escasa. A fin de evaluar la germinabilidad y el rol del metabolismo antioxidante frente al estrés salino, semillas frescas se germinaron en presencia de 0 (control), 30, 60 o 90 mM NaCl. Se evaluó el porcentaje de germinación, el contenido de proteínas solubles y carboniladas, la actividad de enzimas antioxidantes y la generación de especies reactivas de oxígeno tanto en la fase pre-germinativa como durante la germinación. La remoción del arilo y del tegumento micropilar después de 3 h de imbibición, indujo una rápida germinación y activación de las enzimas catalasa, glutatión S-transferasa y peroxidasas, junto con un aumento y una disminución en la generación de O 2 y H 2 O 2 , respectivamente, en el ápice radical. Si bien la germinabilidad y la actividad de algunas de las enzimas estudiadas disminuyeron con el incremento de NaCl, al comparar poblaciones con porcentajes de germinación similares de los tratamientos control y 90 mM NaCl, se observó...

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Section: Introductionmentioning

confidence: 99%

Germinability and antioxidant metabolism in Passiflora caerulea L. seeds exposed to salt stress

Chaín,

Causin

2108

MACN

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“…Restinga is characterized by high variation in soil properties and water availability over short geographic distances. In Brazil’s Atlantic Forest, the dramatic shift in restinga physiognomy has been attributed to several environmental variables (Marques et al 2015), among which are soil fertility (Lourenço Junior and Cuzzuol 2009), salinity (Lourenço et al 2013), organic matter, aluminum saturation (Rodrigues et al 2013), soil texture, and water table depth (Cooper et al 2017). It has been suggested that water table depth and microtopography (fine‐scale variation in soil relief, creating valley regions with wet soils and higher sites with dry soils) may be the most important variable driving restinga forest structure and plant functional traits (here defined as “any trait which impacts fitness indirectly via its effects on growth, reproduction and survival”; Violle et al 2007).…”

Section: Introductionmentioning

confidence: 99%

Soil‐associated drivers of plant traits and functional composition in Atlantic Forest coastal tree communities

Lourenço

Newman

Ventura³

et al. 2021

Ecosphere

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The severe deforestation of Brazil's Atlantic Forest and the increasing effects of climate change underscore the need to understand how tree species respond to climate and edaphic factors. To identify the most important environmental drivers of coastal Atlantic Forest diversity and functional composition, we studied 42 plots of coastal Atlantic Forest (restinga), which has a high diversity of plant communities and spans strong environmental gradients. We examined how forest physiognomy and functional composition respond to changes in the environment, hydraulic, and soil properties. We tested different hypotheses relating the roles of nutrients and soil water availability in driving shifts in tropical forest diversity and functioning. We collected wood samples and leaves from~85% of the plant species identified in the forest inventory and estimated the community-weighted tree height, aboveground biomass, basal area of individual plants, specific leaf area, wood density, and the total tree biomass per community by the sum of all trees' aboveground biomass per plot. We measured water table depth and 24 physicochemical soil parameters. Hypotheses relating to these factors were formalized via both generalized additive models and piecewise structural equation models and null models of community assembly. Increasing drought, as reflected by increasing water table depth, coarse sand, and soil concentration of aluminum (>6 cmol/kg), was found to be a primary driver of shifts in all measured functional traits. Water table depth was found to be the main environmental driver of restinga species diversity, but shifts in species richness were largely decoupled from functional richness and functional dispersion. Our results suggest that decreases in soil water availability are a central driver of local phenotype-environment matching and that increasing water limitation increases the role of environmental filtering on multiple traits. Our results show that drought leads to a strong convergence (standardized effect size < À1.95) in forest function and leads to shifts to smaller statured forest in particular. These findings reveal important differences in the drivers of forest structure and functioning, suggesting that changes in local spatial variation in soil and moisture variables will be a central issue in restinga management and conservation.

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“…The cultivated area in Colombia for these species covers about 10,000 ha (Agronet, 2019). Water is essential for passion fruit plants because it promotes good growth and increases productivity, allowing continuous and regular production with good fruit quality (Jehová et al, 2013).…”

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confidence: 99%

Promissory Passiflora species (Passifloraceae) for its tolerance to water-salt stress

Salazar¹,

Silva²,

Ceballos-Aguirre³

et al. 2020

Rev. Colomb. Cienc. Hortic.

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The aim of this study was to determine the tolerance of water and salt stress in four cultivated species of Passiflora L. Eleven accessions of four species of Passiflora of commercial interest from different plantations were evaluated. The experimental design was in sub-split plots, where the plot was the percentage of water saturation in relation to the requirement of the crop (33% and 100%). The subplot was established by the saturation levels of salt (sodium chloride reactive level - 99.9% purity) (EC: 1.5 and 5.5 dS m-1) with the 11 accessions in a completely randomized array with five replications, where the experimental unit was one plant. Results showed that accessions m11, m13 (P. edulis f. flavicarpa) and m15 (P. tarminiana) were determined as tolerant to salinity and drought; accesses m2 (P. edulis f. edulis), m12 and m14 (P. edulis f. flavicarpa) were moderately tolerant. These observations are the basis for future studies of drought tolerance in Passiflora, which must be followed by field evaluations.

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Effects that nutritional and saline gradients have on the growth of Passiflora mucronata Lam. and Canavalia rosea (Sw.) DC. found in the restinga of Brazil

Cited by 7 publications

References 34 publications

Germinability and antioxidant metabolism in Passiflora caerulea L. seeds exposed to salt stress

Germinability and antioxidant metabolism in Passiflora caerulea L. seeds exposed to salt stress

Soil‐associated drivers of plant traits and functional composition in Atlantic Forest coastal tree communities

Promissory Passiflora species (Passifloraceae) for its tolerance to water-salt stress

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