ORCID Profile
0000-0002-0151-1115
Current Organisations
Universidade de São Paulo Faculdade de Ciências Farmacêuticas de Ribeirão Preto
,
Centro Paula Souza de Tecnologia de Ribeirão Preto
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Publisher: FapUNIFESP (SciELO)
Date: 03-2011
DOI: 10.1590/S1984-70332011000100011
Abstract: A citrus scab disease, caused by Elsinoe fawcettii, is currently found in all citrus areas throughout Brazil. That being, given the importance of this casual agent, the behavior of tangerines and hybrids influenced by this pathogen was evaluated under natural infection conditions. This study was performed with plants around 15 years old without irrigation 100 fruits of three plants were collected during harvest season, using a grade scale varying from 0 (absence of symptoms) to 6 (severe symptoms) the level of disease severity was determined. Among the cultivars, citrus scab resistance was observed in Citrus deliciosa, C. tangerina, C. nobilis a mandarin hybrid (C. nobilis x C. deliciosa) and a satsuma hybrid (C. unshiu x C. sinensis ). Among the other genotypes, symptoms were observed with levels of severity ranging from 1 to 3, indicating moderate resistance.
Publisher: FapUNIFESP (SciELO)
Date: 2010
DOI: 10.1590/S0006-87052010000200008
Abstract: O objetivo da presente pesquisa foi estudar o efeito da interferência de caruru-de-mancha (Amaranthus viridis), picão-preto (Bidens pilosa), tiririca (Cyperus rotundus) e Maria-pretinha (Solanum americanum) sobre a altura de plantas, a área foliar, o teor de clorofila, o acúmulo de massa seca e macronutrientes na cultura e a massa fresca de frutos do tomateiro industrial. Os tratamentos foram (a) duas plantas de tomateiro + duas de A. viridis (b) duas plantas de tomateiro + duas de B. pilosa (c) duas plantas de tomateiro + duas de C. rotundus e (d) duas plantas de tomateiro + duas de S. americanum. Além disso, manteve-se uma testemunha com duas plantas de tomateiro sem associação com planta daninha. Dentro de cada espécie de planta daninha, o efeito sobre a cultura foi o mesmo para todas as características avaliadas, independentemente da distância utilizada. A. viridis e S. americanum foram plantas daninhas com maior capacidade competitiva que B. pilosa e C. rotundus. O teor de clorofila, a altura e a área foliar do tomateiro não foram afetados pela convivência com as plantas daninhas. B. pilosa e C. rotundus não influenciaram no acúmulo de macronutrientes do tomateiro, enquanto A. viridis e S. americanum afetaram de maneira diferenciada em função da distância utilizada, sendo A. viridis a espécie mais competitiva. A massa fresca de frutos do tomateiro não foi reduzida pela convivência com as quatro espécies de plantas daninhas.
Publisher: Elsevier BV
Date: 06-2018
Publisher: Springer Science and Business Media LLC
Date: 23-12-2019
DOI: 10.1007/S10886-019-01141-W
Abstract: The botanical source of Brazilian green propolis (BGP) is Baccharis dracunculifolia DC, which interacts not only with Apis mellifera, but also with galling insects. In the last decade, because of green propolis´ important biologic activities, the international demand for BGP overcame the production capacity, consequently, new approaches are required to increase this production. Hence, the understanding of the chemical ecology interactions of B. dracunculifolia with galls and bees in field conditions may provide insights to increase BGP's production. A "bee pasture" experiment aiming to better understand this plant-insect interaction was therefore performed. For that, 48 B. dracunculifolia in iduals, being 24 females and 24 males, were cultivated and investigated for the following parameters: (1) phenolic and volatile compounds in both B. dracunculifolia leaves and green propolis, (2) environmental variables, (3) visiting rate by bees, (4) time of resin collection, and (5) number of galls. Regression analyses by independent linear mixed-effect models were run to correlate phenolic and volatile compounds concentration with the environmental and field variables. Significant differences in chemical profile and field variables were observed between male and female plants. Male plants showed higher infestation by galling insects while female plants showed higher number of visiting bees, time of resin collection and terpenes concentration, contributing to the differences observed in the field. The obtained results suggest that increasing the percentage of female B. dracunculifolia plants in the field may attract more bees and therefore enhance propolis production.
Publisher: FapUNIFESP (SciELO)
Date: 02-2014
Abstract: We developed linear equations to predict the leaf area (LA) of the species Styrax pohlii and Styrax ferrugineus using the width (W) and length (L) leaf dimensions. For both species the linear regression (Y=α+bX) using LA as a dependent variable vs. W × L as an independent variable was more efficient than linear regressions using L, W, L2 and W2 as independent variables. Therefore, the LA of S. pohlii can be estimated with the equation LA=0.582+0.683WL, while the LA of S. ferrugineus follows the equation LA=−0.666+0.704WL.
Publisher: EDUFU - Editora da Universidade Federal de Uberlandia
Date: 2015
Publisher: Springer Science and Business Media LLC
Date: 25-01-2016
Publisher: FapUNIFESP (SciELO)
Date: 03-2015
Abstract: Leaf area estimation is an important biometrical trait for evaluating leaf development and plant growth in field and pot experiments. We developed a non-destructive model to estimate the leaf area (LA) of Vernonia ferruginea using the length (L) and width (W) leaf dimensions. Different combinations of linear equations were obtained from L, L2, W, W2, LW and L2W2. The linear regressions using the product of LW dimensions were more efficient to estimate the LA of V. ferruginea than models based on a single dimension (L, W, L2 or W2). Therefore, the linear regression “LA=0.463+0.676WL” provided the most accurate estimate of V. ferruginea leaf area. Validation of the selected model showed that the correlation between real measured leaf area and estimated leaf area was very high.
Publisher: FapUNIFESP (SciELO)
Date: 09-2012
DOI: 10.1590/S0102-33062012000300022
Abstract: Vanilla planifolia é uma espécie com grande valor comercial, porém sua propagação é dificultada devido à baixa germinação de suas sementes. No presente estudo procurou-se avaliar a influência da escarificação destas sementes por meio da imersão em H2SO4 concentrado durante 60, 120 e 180 segundos, bem como de diferentes concentrações de nitrogênio sobre a germinação e o desenvolvimento das plântulas. Sessenta segundos de escarificação e 25% de nitrogênio no meio de cultura proporcionaram os melhores resultados sobre a germinação e desenvolvimento de V. planifolia, constituindo-se em um procedimento viável para a produção comercial dessa espécie.
Publisher: Springer Science and Business Media LLC
Date: 12-09-2015
Publisher: Springer Science and Business Media LLC
Date: 02-06-2015
Publisher: Wiley
Date: 30-08-2019
DOI: 10.1111/PLB.13036
Abstract: Most aluminium (Al)-accumulating species are found on soils with high Al saturation and low Ca availability (Ca poor). Callisthene fasciculata Mart. (Vochysiaceae), however, is an Al-accumulating tree restricted to Ca-rich soils with low Al saturation in the Brazilian Cerrado savanna. Here we tested its calcicole behaviour, and the possible role of organic acids in detoxification of Al during the early stages of plant development. We assessed growth, dry mass, nutrients, Al and organic acids in seedlings grown for 50 days on two contrasting Cerrado soils one with high Ca concentrations and low Al saturation and the other with low Ca availability and high Al saturation. Relative to plants on Ca-rich soil, plants on Ca-poor soil had necrotic spots and bronzing of leaves. Roots and shoots contained reduced concentrations of P and Cu, but higher concentrations of Fe, Al and citrate. Despite lower concentrations in the soil, Ca and Mg increased in shoots. Shoot concentrations of oxalate were also higher. We confirmed C. fasciculata as an Al-accumulating species with calcicole behaviour. The increased concentrations of organic acids in plants with higher Al accumulation suggest that high availability of soluble Al does not prevent occurrence of this species on soils with high Al saturation. Instead, the absence of C. fasciculata from Ca-poor soils is probably due to imbalances in tissue Fe, Cu and Zn imposed by this soil type.
Publisher: InTech
Date: 25-01-2012
DOI: 10.5772/31271
Publisher: FapUNIFESP (SciELO)
Date: 03-2011
DOI: 10.1590/S0100-83582011000100008
Abstract: A área foliar é uma das principais características para avaliar o crescimento vegetal. Objetivou-se neste trabalho determinar uma equação matemática para estimar a área foliar de Pistia stratiotes a partir de dimensões lineares dos limbos foliares. A pesquisa foi desenvolvida na Universidade Estadual Paulista, Jaboticabal-SP, Brasil. Cem folhas, coletadas no ambiente natural, foram eletronicamente medidas em comprimento (C), largura máxima (L) e área foliar (AF). Os dados de AF e C × L foram submetidos à análise de regressão linear, determinando-se uma equação matemática para estimar a área foliar da espécie. A análise de variância sobre a regressão linear e a análise de correlação entre os valores de área foliar e estimada foram significativas (p 0,01). A área foliar de P. stratiotes pode ser estimada pela equação: AF = 0,79499 (CL).
Publisher: FapUNIFESP (SciELO)
Date: 28-07-2015
DOI: 10.1590/0001-376520150381
Abstract: Despite limitations of low fertility and high acidity of the soils, the cerrado flora is the richest amongst savannas. Many cerrado woody species show sclerophyllous leaves, which might be related to the availability of water and nutrients in the soil. To better understand the function and structure of cerrado vegetation within its own variations, we compared two cerrado communities: one in its core region in central Brazil (Brasília, DF) and the other on its southern periphery (Itirapina, SP). We contrasted the length of the dry season, soil fertility rates, leaf concentrations of N, P, K, Ca and Mg and the specific leaf area (SLA) between these communities. The dry season was shorter on the periphery, where the soil was more fertile although more acidic. Plants from the periphery showed higher SLA and higher leaf concentrations of N, P, Ca and Mg. We propose that the higher SLA of plants from the periphery is related to the shorter dry season, which allows better conditions for nutrient uptake.
Publisher: Canadian Center of Science and Education
Date: 17-03-2013
DOI: 10.5539/JAS.V5N4P56
Publisher: Springer Science and Business Media LLC
Date: 26-07-2017
Publisher: Elsevier BV
Date: 12-2009
Publisher: Elsevier BV
Date: 04-2018
DOI: 10.1016/J.JINORGBIO.2017.09.010
Abstract: The mechanisms of extreme Al-resistance in Urochloa decumbens are not established. Full resistance expression requires a lag time of 72-96h and is preceded by a sensitive phase (24-48h) with Al-induced root growth inhibition. The aim here was to identify key processes of the activation phase of Al-resistance analysing both root exudates and comparative root proteome. S les were taken after 0, 24 and 96h exposure to 0 or 200μM Al. Al-induced stimulation of citrate and oxalate efflux was limited to the sensitive phase. Only 11 proteins revealed Al-induced abundance differences six were identified. After 24h, phenylalanine ammonium lyase (PAL), methionine synthase (MS), and deoxymugineic acid synthase (DMAS) decreased, while acid phosphatase (APase) abundance increased. Coincident with growth recovering, PAL and MS, but not DMAS, returned to initial levels. After 96h, γ‑carbonic anhydrase (γ‑CA) and adenylate kinase (AK) along with two unidentified proteins were more abundant. In conclusion, few protein changes characterize the initial response to Al in signalgrass. During the alarm phase, changes are related to P-mobilization, downregulation of Fe-acquisition, reduction of phenolic biosynthesis, and small stimulation of organic acid exudation. After recovering (resistant phase), biosynthesis of phenolics and methionine, but not Fe-mobilization are re-established. Full expression of Al-resistance is characterized by enhanced γ‑CA mediating mitochondrial complex I assembly and increased AK abundance indicating higher root respiration and better provision of ADP and Mg
Publisher: FapUNIFESP (SciELO)
Date: 09-06-2015
DOI: 10.1590/0001-3765201520140222
Abstract: The cerrado's flora comprises aluminum-(Al) accumulating and non-accumulating plants, which coexist on acidic and Al-rich soils with low fertility. Despite their existence, the ecological importance or biological strategies of these functional groups have been little explored. We evaluated the leaf flushing patterns of both groups throughout a year leaf concentrations of N, P, K, Ca, Mg, S, Al, total flavonoids and polyphenols as well as the specific leaf area (SLA) on young and mature leaves within and between the groups. In Al-accumulating plants, leaf flushed throughout the year, mainly in May and September for non-accumulating plants, leaf flushing peaked at the dry-wet seasons transition. However, these behaviors could not be associated with strategies for building up concentrations of defense compounds in leaves of any functional groups. Al-accumulating plants showed low leaf nutrient concentrations, while non-accumulating plants accumulated more macronutrients and produced leaves with high SLA since the juvenile leaf phase. This demonstrates that the increase in SLA is slower in Al-accumulating plants that are likely to achieve SLA values comparable to the rest of the plant community only in the wet season, when sunlight capture is important for the growth of new branches.
Publisher: FapUNIFESP (SciELO)
Date: 04-2011
Publisher: FapUNIFESP (SciELO)
Date: 03-2009
DOI: 10.1590/S0100-83582009000100005
Abstract: Bidens pilosa é uma das mais importantes plantas daninhas que ocorrem em lavouras anuais e perenes da região Centro-Sul do Brasil. A grande capacidade de produção de aquênios é uma das suas principais estratégias de sobrevivência, e o conhecimento das condições fundamentais para germinação e emergência das plântulas é essencial para predição do crescimento populacional e para a elaboração de plano de manejo de suas infestações e de seus biótipos resistentes aos herbicidas. Foram conduzidos ensaios em condições de casa de vegetação, onde foi avaliada a emergência de aquênios de B. pilosa em diferentes profundidades (0, 1, 2, 3, 4 e 5 cm). Os experimentos foram conduzidos nos meses de maio, agosto e novembro de 2006 e em março de 2007. Os resultados mostraram que a emergência de plântulas de picão-preto foi bastante afetada pela localização do aquênio no perfil do solo, ocorrendo expressiva redução a partir de 2 cm de profundidade. Essa característica da biologia reprodutiva do picão-preto é importante para a formação de densos bancos de sementes em solos submetidos ao preparo convencional, onde grande parte da chuva de sementes é nele incorporada.
Publisher: FapUNIFESP (SciELO)
Date: 09-2010
Publisher: Elsevier BV
Date: 09-2018
DOI: 10.1016/J.PHYTOCHEM.2018.05.020
Abstract: Mechanisms to detoxify aluminium (Al) is a hot topic for cultivated plants. However, little information is known about the mechanisms used by native plants to deal with Al-toxicity. In Cerrado, some generalist mistletoe species, such as Passovia ovata (Pohl ex DC.) Kuijt and Struthanthus polyanthus Mart. can parasitize Al-accumulating and Al-excluding plant species without any clear symptoms of toxicity and mineral deficiency, while Psittacanthus robustus (Mart.) Marloth, a more specialist mistletoe, seems to be an Al-dependent species, parasitizing only Al-accumulating hosts. Here we (i) characterized the forms and compartmentalization of Al in leaves of P. robustus (ii) compared Ca and Al leaf concentration, and leaf concentration of organic acids and polyphenols between facultative Al-accumulating (P. ovata and S. polyanthus) and Al-dependent (P. robustus) mistletoe species infecting Miconia albicans (Sw.) Steud. (Al-accumulating species). P. robustus chelated Al
Publisher: Elsevier BV
Date: 06-2018
Location: Brazil
No related grants have been discovered for Marcelo Claro de Souza.