Silvana de Paula Quintão Scalon

UFGD - Universidade Federal da Grande Dourados, Dourados, Mato Grosso do Sul, Brazil

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Publications (120)33.41 Total impact

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    ABSTRACT: Research on the ecophysiology of seedling propagation of native species is essential to meet the growing need to remediate environmentally degraded areas. The objective of this study was to evaluate the effect of shade on the emergence, initial growth, and quality of seedlings of Physocalymma scaberrimum Pohl. Seeds were sown in cells kept in full sun and under conditions of 30 and 70 % shade. To evaluate the initial growth of seedlings at 80 days after emergence, the seedlings were transplanted to plastic bags containing a mixture of sifted distroferric red latosol, sand, and semidecomposed chicken manure (1:1:0.5) and kept under the same light conditions. Analysis was carried out after 30 days of acclimatization and every 30 days (30, 60, 90, and 120 days after transplantation when seedlings were 110, 140, 170, and 200 days old). The 30 and 70 % shade conditions resulted in greater seed germination and vigor in P. scaberrimum. However, seedlings exposed to full sun and 30 % shade showed greater growth, better quality, and more efficient carboxylation.
    No preview · Article · Dec 2015 · Brazilian Journal of Botany
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    DAIANE M. DRESCH · TATHIANA E. MASETTO · SILVANA P.Q. SCALON
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    ABSTRACT: The aim of this study was to evaluate the sensitivity of Campomanesia adamantium seeds to desiccation by drying in activated silica gel (fast) and under laboratory conditions (slow). To assess the sensitivity of the seeds to desiccation, we used drying with silica gel and drying under laboratory conditions (25 °C), in order to obtain seeds with moisture content of 45, 35, 30, 25, 20, 15, 10 and 5%. The physiological potential of the seeds after desiccation was evaluated by measuring primary root protrusion, percentage of normal seedlings, germination seed index, seedling length, total seedling dry mass, electrical conductivity and DNA and RNA integrities. The C. adamantium seeds were sensitive to desiccation and to a reduction in moisture content to 21.1% or less by desiccation using silica gel, and to 17.2% or less by desiccation under laboratory conditions; impairment of the physiological potential of the seeds was observed at these low moisture content levels. The integrity of the seed genomic DNA was not affected after drying seeds in the two methods. However, drying in silica gel to 4.5% moisture content and drying under laboratory conditions to 5.4% moisture content resulted in the loss of seed RNA integrity.
    Full-text · Article · Dec 2015 · Anais da Academia Brasileira de Ciências
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    D M Dresch · S P Q Scalon · R M Mussury · T E Masetto
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    ABSTRACT: The objective of study was to verify if desiccation and storage of the seeds affect the morphoanatomy and histochemistry of the seedlings of Campomanesia adamantium. The fruits were processed and seeds were subjected to desiccation to 30, 20, 15, 10 and 5% water contents in laboratory conditions and subsequently subjected to the following storage conditions: In the laboratory (LAB) (25 ± 2°C, 35% RH), cold and dry chamber (CC) (16 ± 2°C, 40% RH), refrigerator (REF) (8 ± 2°C, 35% RH), and freezer (FZ) (-18 ± 1°C, 42% RH) for 0 (newly processed), 30, 60, 90, 120, 150, and 180 days. The evaluation of the seedling survival rate was performed for 42 days, calculated as the survival percentages for seedling shoot and primary root. Anatomical observations and histochemical tests were performed using fixed and non-fixed samples of the median region of xylopodium in normal and abnormal seedlings. In the morphoanatomy of normal seedlings, we observed cotyledons, hypocotyl, xylopodium, and well defined primary root and in abnormal seedlings, cotyledons, hypocotyl and xylopodium (with 20 and 15% water content), and hypocotyl and primary root (with 10% water content). The desiccation and storage of seeds affected the formation of seedlings by preventing the normal development of roots and shoots. The xylopodium of normal and abnormal seedlings showed positive reaction to starch and lipophilic substances. The presence of phenolic compounds and fructans were observed in parenchyma cells of the xylopodium in abnormal seedlings and absent in normal ones. The deleterious effects of desiccation in association with storage induce the production of phenolic compounds and fructans in abnormal C. adamantium seedlings.
    Full-text · Article · Sep 2015 · African journal of agricultural research
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    Carla Regina Baptista Gordin · Silvana de Paula Quintão Scalon · Tathiana Elisa Masetto
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    ABSTRACT: Niger is a promising oilseed species for biodiesel production but there is no much information about the physiological potential of its seeds. Thus, the aim was to adapt the methodologies of accelerated aging test on six lots of niger seeds. The test was carried out by traditional and with saturated salt solution (20 and 40 g NaCl.100 mL-1) methods at 41 and 45 °C for 24, 48, 72 and 96 hours. After the decay period, the seeds were submitted to the germination test, proceeding to an evaluation on the seventh day after sowing, counting the normal seedlings percentage. A completely randomized design with four replications of 50 seeds was used and the means were compared by Tukey’s test. The accelerated aging test was correlated with seedling emergence and provided lots classification in at least two levels of vigor. For the accelerated aging test, the method with 20 g NaCl.100 mL-1 at 41 °C for 24 hours is recommend. The traditional method is not suitable because it provides water content variation between samples above what is tolerable. © 2015, Associacao Brasileira de Tecnologia de Sementes. All rights reserved.
    Preview · Article · Sep 2015
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    C.R.B. Gordin · S.P.Q. Scalon · T.E. Masetto
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    ABSTRACT: Niger is an oleaginous species whose cultivation has been spreading, but there is not much information on the adverse conditions during its seedling establishment. This study aimed at evaluating the effects of substrate water availability and seed water content on niger germination. Seeds were moistened using the humid atmosphere method for 0; 24; 48; and 72 hours, obtaining the water contents of 7.0%, 12.8%, 16.8% and 32.2%. Then, they were sown in substrate moistened with PEG 6000 solutions with different osmotic potentials: 0.0 MPa (control), -0.1 MPa, -0.2 MPa, -0.3 MPa and -0.4 MPa. A completely randomized design, in a 4 x 5 factorial scheme (water content x osmotic potential), with four replications of 50 seeds, was used. First count and germination percentage, germination speed index and mean time, shoot and root length and seedlings dry weight were evaluated. The reduction in the substrate osmotic potential decreases the niger seed germination and seedling growth, regardless of water content, but with a higher evidence in seed water contents below 32.2% and 12.8%, respectively. © 2015, Universidade Federal De Goias (UFG). All rights reserved.
    Preview · Article · Aug 2015 · Pesquisa Agropecuaria Tropical
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    D P Nunes · D M Dresch · S P Q Scalon · Z V Pereira
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    ABSTRACT: The aim of this study was to evaluate the level of sensitivity to desiccation of Campomanesia xanthocarpa seeds and reduce it by using polyethylene glycol (PEG) and abscisic acid (ABA) to maintain viability. In experiment I, the seeds were desiccated to 35, 30, 25, 20, 15, 10, and 5 ± 2% moisture content by using silica gel (fast drying) and by drying them at room conditions (slow drying; 25 ± 2°C and 35% relative humidity). In experiment II, the seeds were soaked for 0, 60, and 120 h in PEG (-1.48 MPa), with ABA at different concentrations (0, 10-3 , 10-4 and 10-5 µM). Subsequently, they were desiccated to 15% moisture content by fast drying. C. xanthocarpa seeds are sensitive to desiccation; however, we showed that slow drying them at 25°C room temperature for 12.5 h to 15% moisture level, and then fast drying by using silica gel for 7 h to 20% water content maintained long-term seed viability. Sowing must be performed immediately to avoid further moisture loss. Osmotic conditioning, irrespective of whether abscisic acid was used, did not reduce the sensitivity to desiccation of C. xanthocarpa seeds.
    Full-text · Article · Aug 2015 · African journal of agricultural research

  • No preview · Article · Jul 2015 · SEMINA: CIENCIAS AGRARIAS
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    ABSTRACT: The conservation of seeds, as well as the amount of light, are important factors for good germination and seedling production quality. In the present study the effect of storage and different levels of light on the emergence and initial growth of seedlings of (Magonia pubescens St. Hil. was evaluated. Two experiments were conducted. In the first one, the storage was done in three packaging types (aluminum foil, paper and plastic bag low density polyethylene) and under two temperatures (10 and 25 °C) for three periods of storage (30, 60 and 90 days) or without storage. In the second experiment the initial growth of seedlings was studied in four shading levels (30, 50 and 70%) and full sun. The seeds of M. pubescens germinate best when they were not stored, with averages of 97% compared to 69% after 90 days of storage. If necessary, the storage must be carried in a plastic bag at 25 °C for 90 days. The seedlings had higher emergence and quality when sowing and growth were performed under 50% of shading. © 2015, Sociedade de Investigacoes Florestais. All rights reserved.
    Preview · Article · Jul 2015 · Revista Árvore
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    ABSTRACT: A salinidade é fator limitante para que ocorra germinação na maioria das espécies sendo necessários estudos que avaliem a interação entre plantas e o ambiente salino ao qual estão associadas. O presente estudo consistiu em avaliar a germinação e características de vigor em Salvia splendens submetidas à salinidade. As sementes foram expostas a diferentes potenciais osmóticos, simulando condições de estresse salino, provocado por NaCl, CaCl2 e KCl nos potenciais de 0; -0,4; -0,8; -1,2; -1,6 e -2,0 MPa. De modo geral, pode-se observar que o CaCl2 resultou em melhores resultados para todas as variáveis analisadas, provavelmente ligado ao efeito positivo do Ca2+ no metabolismo celular, permitindo germinação 60,81% no potencial osmótico de -1,35 MPa.
    Preview · Article · Apr 2015
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    ABSTRACT: Despite the economic importance of Crambe abyssinica, the present study is the first report on bees that occur with this species, and could aid in developing alternative methods for controlling insect pests without seriously impacting pollinators. The present study examined the following questions: (1) Which species are potential pollinators of C. abyssinica? (2) How do environmental conditions influence pollinator visitation fluctuations? Insects were sampled on a weekly basis between 08:00 and 16:00 during five weeks of flowering. When the results of analyses of variance were significant, the data was adjusted using regression equations at a 5% level of probability; the environmental variables were examined using Pearson's correlation coefficient. Apis mellifera, Geotrigona mombuca, Exomalopsis (Exomalopsis) fulvofasciata, Plebeia sp. and Dialictus sp. were observed visiting C. abyssinica flowers. A. mellifera and G. mombuca were observed to be potential pollinators, with the former demonstrating visitation peaks during flowering weeks II and IV at 12:00 and 08:00, respectively and the latter visiting during weeks III and IV at 12:00 and 10:00, respectively. Environmental factors such as temperature, relative humidity, and wind speed have different effect on the activity of bees.
    Preview · Article · Mar 2015 · Anais da Academia Brasileira de Ciências
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    ABSTRACT: Resumen El objetivo de este trabajo consistió en evaluar el efecto de los pre-tratamientos con giberelinas, la humedad inicial del sustrato y la temperatura de incubación sobre la germinación de Psidium guineense Swartz. Las semillas se sometieron a cuatro tratamientos previos con giberelina (GA 3) (50 y 100 mg L -1) y agua destilada durante 24 horas y un control. La siembra se hizo en papel Germitest ® humedecido con agua destilada a niveles de humedad correspondientes a 1,5 y 2,5 veces el peso de papel seco. Luego las semillas se incubaron a temperaturas constantes (25 y 30 °C) y a temperaturas variables (20-30 °C). El procedimiento estadístico utilizado fue un diseño factorial 4 x 2 x 3 (pre-tratamiento x humedad inicial del sustrato x temperatura) completamente al azar con cuatro repeticiones de 25 semillas cada una. La germinación de las semillas y el crecimiento de las plántulas de P. guineense no se vieron afectados por los tratamientos pre-germinación. Para una germi-nación y crecimiento óptimos las semillas de P. guineense deberían sembrarse a temperaturas de 20-30 o 25 °C y a una humedad del sustrato de 1,5 o 2,5 veces la masa del papel seco. Summary Efecto de pre-tratamientos sobre la germinación de semillas y crecimiento de plántulas Psidium guineense Swartz
    Full-text · Article · Dec 2014
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    ABSTRACT: The aim of this research was to evaluate the quality and photosynthetic metabolism of "uvaia" seedlings (Eugenia pyriformis Cambess.) on different substrates and water regimes. The seeds were sown in tubes of 50 x 190 mm in the following substrates: Sand (S), Latosol + Sand (L + S) (1:1), Latosol + Sand + Semi Decomposed Poultry Litter (L + S1 + PL) ( 1:1:0.5), Latosol + Sand + Semi Decomposed Poultry Litter (L + S2 + PL) (1:2:0.5), Latosol + Bioplant® (L + B) (1:1), and the water levels assessed were 50, 75 and 100% of water retention capacity. At 60, 90, 120 and 150 days the seedlings were evaluated according to their chlorophyll index, leaf area (cm2) and Dickson Quality Index (DQI) and at 150 days their internal concentration of carbon (mol m-2 s-1), stomatal conductance (mol m-2 s-1), transpiration rate (mmol m-2 s-1), photosynthesis (µmol m-2 s-1) and efficiency of water use (µmol de CO2 / mmol de H2O). Until their 150th days, the seedlings had higher quality and photosynthetic metabolism when cultured with substrates containing latosol + sand + poultry litter on the two variations assessed and water retention capacity of 50%.
    Full-text · Article · Nov 2014 · Anais da Academia Brasileira de Ciências
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    Daiane M Dresch · Silvana P Q Scalon · Tathiana E Masetto
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    ABSTRACT: The aim of this study was to evaluate the effect of pre-treatments on overcoming dormancy of A. coriacea seeds. Seeds were processed and stored in polyethylene bags at temperatures of at -18°C (42% RH), 5°C (34% RH), 15°C (60% RH) and 25°C (34% RH), during 0, 30, 60, 90, 120 and 150 days. After storage, seeds were immersed in 350 mg.L-1 gibberellic acid for 144 hours. Sowing was carried out in plastic bags containing Red Latosol + Bioplant®. Moisture content, emergence percentage, emergence speed index, length and dry mass of seedlings, were evaluated. The experimental design was completely randomized in a factorial with four replications of 50 seeds each. The seed storage at 5°C and subsequent immersion in gibberellic acid was efficient to reach high percentage, emergence speed and plant growth. A. coriacea seeds showed non-deep simple morphophysiological dormancy wherein the physiological component can be overcome after the seeds are storage at 5°C for a maximum period of 53 days and subsequent immersed in exogenous GA (350 mg.L-1 for 144 hours).
    Preview · Article · Oct 2014 · Anais da Academia Brasileira de Ciências
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    Silvana de Paula Quintão Scalon · Tathiana Elisa Masetto · Daiany Sampaio Carnaúba de Matos · Leandro Motta
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    ABSTRACT: The technical difficulty to obtain seedlings due to seed dormancy is an obstacle in the production of native species in the recovery of Brazilian Savannah degraded areas programs. Thus, the objective of the present study was to evaluate the effect of physiological conditioning and shading on seed quality of two species of barbatimão (Stryphnodendron polyphyllum and Strypnhodendron adstringens). Seeds were soaked in seven conditions: 1) PEG -1.0 MPA; 2) PEG -1.0 MPA+ KNO3 -1.0 MPA; 3) PEG -0.5 MPA; 4) PEG -0.5 MPA + KNO3 -0.5 MPA; 5) KNO3 -1.0 MPA; 6) distillate water and 7) without soaking (control). During the treatments, the seeds remained incubated in BOD 20/30 ºC for 24 h, then they were sown in cell trays containing Plantmax®, and maintained under four shading levels (full sun, 30%, 50% and 70%) with four repetitions of 20 seeds. After the evaluation of the emergency percentage, the seedlings were transplanted and kept under the same shade levels. The physiological conditioning on water of both species seeds, followed by sowing under 50 to 70% shade, are effective for faster and high emergency, greater height and dry mass of seedlings. S. polyphyllum seeds can be conditioned with PEG -1.0 MPa and PEG – 0.5 MPa if sown under 30% shade. However, seeds from S. polyphyllum and S. adstringens species should not be sown at full sun.
    Preview · Article · Feb 2014 · Revista Árvore

  • No preview · Article · Jan 2014 · Revista Brasileira de Plantas Medicinais

  • No preview · Article · Jan 2014 · American Journal of Plant Sciences
  • Daiane Mugnol Dresch · Silvana de Paula Quintão Scalon · Tathiana Elisa Masetto · Rosilda Mara Mussury

    No preview · Article · Jan 2014 · American Journal of Plant Sciences
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    ABSTRACT: Niger (Guizotia abyssinica Cass.) is an oilplant with biodiesel potential production. However, there is little information about the seeds physiological quality production. This work aimed to evaluate niger germination and seedlings growth submitted to different temperature and substrate water availability. The first experiment was carried out in a germination chamber as B.O.D. with constants temperatures (5, 10, 15, 20 e 25 °C) and an alternated temperature (20-30 °C). For the second experiment seeds were sowed on paper substrate Polyethylene Glicol 6000 different osmotic potentials moisture solutions (0.0; -0.2; -0.4; -0.8 e -1.2 MPa) and it were kept in the germination chamber as B.O.D. at 25°C. Evaluated the germination percentage, germination speed index, germination medium time, aerial part and root length and fresh and dry seedlings mass. Results showed the 20-30, 25 e 20 °C temperatures favored the niger seeds germination percentage and speed index. Niger seeds are sensitive to temperatures below 15 °C and the substrate water availability decrease from -0.2 MPa prejudice seeds germination and seedlings growth.
    No preview · Article · Jan 2014
  • D.P. Nunes · S.P.Q. Scalon · T. Bonamigo · R.M. Mussury
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    ABSTRACT: The target of this study was to evaluate seed ecophysiology germination of Alibertia edulis (Rich) A. Rich. ex DC. (quince) at different environmental condition. Two experiments were done at the Laboratory of Nutrition and Metabolism of Plant from UFGD (Universidade Federal da Grande Dourados). Experiment I evaluated 4 temperatures (15, 20, 25 e 30°C) and two light conditions (absence and presence of light); experiment II evaluated the salt effect of KC1, NaCl and CaCl2 at osmotic potencial of 0,0 (control); -0,4; -0,8; -1,2; -1,6; -2,0 MPa seed germination. The seeds are photoblastism neutral and do not germinate at 15 ° C. The 25 ° C showed a higher rate of speed and percentageof germination and shoot length of seedlings. The seeds are sensitive to salinity caused by NaCl, KCl and CaCl2, which negatively affect seed germination and seedling growth. © 2014, Universidade Federal de Uberlandia. All Rights Reserved.
    No preview · Article · Jan 2014
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    Tathiana Elisa Masetto · Silvana de Paula Quintão Scalon
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    ABSTRACT: Hancornia speciosa is a native tree species of the Brazilian Cerrado whose seeds are desiccation sensitive. In this study, we aimed to evaluate drying and osmotic conditioning in H. speciosa seeds. We used fresh seeds with 48% moisture content, which were slowly dried until they attained contents of 20%, 15%, 10% and 5%. To evaluate osmotic conditioning, the seeds were imbibed in 12 mL osmotic solutions at 0.0; -0.2; -0.4 and -0.6 MPa for two days. After that, they were dehydrated until their original moisture content. The experiments were carried out in a completely randomized design with four repetitions with 50 seeds each. Reduction in moisture content from 20% to 5% decreased the physiological potential of seeds. H. speciosa seeds do not require osmotic priming with PEG solutions, because imbibition of seeds in osmotic solutions of up to -0.6 MPa results in reduction of germination rate and seedling length.
    Preview · Article · Jan 2014 · Floresta e Ambiente