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Paulo Roberto de Camargo e Castro

Paulo Roberto de Camargo e Castro
Escola Superior de Agricultura "Luiz de Queiroz", Universidade de São Paulo · Departamento de Ciências Biológicas

PhD in Agronomy

About

177
Publications
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Introduction
I am agronomist (University of São Paulo - 1968), Msc in Agronomy (Soil Science and Plant Nutrition, University of São Paulo -1974) and PhD in Agronomy (University of São Paulo -1976). Currently, I am full professor at the University of São Paulo. I study Plant Physiology, with emphasis on plant development, plant growth regulators and crop productivity.
Additional affiliations
January 1972 - present
Escola Superior de Agricultura "Luiz de Queiroz"
Position
  • Professor (Full)

Publications

Publications (177)
Article
Full-text available
The existence of chlorophylls in seeds indicates the presence of the photosynthetic apparatus, which is frequently associated with photosynthesis. However, this paper gathered evidences suggesting the functioning of the photorespiratory metabolism in seed tissues. For instance, the presence of transcripts, occurrence of proteins and detection of ac...
Article
Tomato (Solanum lycopersicum L.) plants are able to adapt to restrictive environmental conditions mainly due to hormones such as brassinosteroids (BRs) that play important roles in determining stomata conductance and leaf transpiration. However, BRs effects on morphological traits like stomata and trichome position, size, and density, as well as on...
Article
Full-text available
Calcium (Ca2+) is a nutrient in tomato plants, of which deficiency usually causes several problems including a physiological disorder known as blossom-end rot (BER) in the fruit. The objective of this study was to evaluate and identify morphological and physiological characteristics related to the susceptibility of tomato varieties to BER. The vari...
Article
Full-text available
Some plants are able to maintain or improve their performance under cadmium (Cd) exposure, despite the high Cd concentrations in roots and shoots, indicating they have protective strategies to neutralize the side‐effects from Cd accumulation. The regulation of antioxidant machinery and the mitigation of Cd uptake and translocation have been the foc...
Article
Tolerance level to cadmium (Cd) toxicity is generally associated with reductions of the internal Cd accumulation in living organisms. In plants, Cd exposure frequently triggers negative effects on their growth and productivity. However, an increased number of studies has reported the improved performance of some plant species (or their accessions/...
Article
Full-text available
Blossom-end rot (BER) is a physiological disorder believed to be triggered by low Ca²⁺ content in the distal fruit tissue. However, many other factors can also determine fruit susceptibility to BER. It is possible that during fruit growth, Ca²⁺ imbalance can increase membrane leakiness, which may trigger the accumulation of reactive oxygen species,...
Book
A utilização de aminoácidos na agricultura tem sido praticada por várias décadas, no Brasil e no mundo, em diversas culturas. O número de empresas, ofertando no comércio uma ampla gama de produtos, à base de aminoácidos, vem aumentando consideravelmente. Muitos técnicos e produtores relatam benefícios na utilização destes produtos. Entretanto, exis...
Book
Full-text available
Blossom-end rot (BER) is a physiological disorder which affects tomato fruit. This book reviews many aspects of BER like plant nutrition, physiology and suggesting some controls.
Article
Full-text available
p> O tratamento de sementes com agroquímicos é uma prática que confere maior proteção à plântulas contra pragas e doenças, no entanto poucas pesquisas são conduzidas para avaliar o efeito fisiológico desses produtos sobre a cultura do milho. Nosso estudo objetivou determinar o efeito de doses crescentes: 0; 17,5; 35; 52,5 e 70 g ingrediente ativo...
Article
Cadmium (Cd) toxicity is frequently coupled to its accumulation in plants, but not always the highest Cd concentration triggers the worst damages, indicating that additional events influence the magnitude of Cd side-effects. We investigated the early mechanisms behind the differential Cd-induced impacts on plant development of four tomato accession...
Article
Full-text available
Calcium (Ca²⁺) is an essential macronutrient in plants, and low concentrations of this nutrient may result in development of a physiological disorder known as blossom-end rot (BER) in tomato. Hormones can regulate the accumulation of Ca²⁺ and, consequently, fruit susceptibilities to BER. The objective of this study was to evaluate the effect of gib...
Article
Full-text available
Water stress leads to large productivity losses in rice cultivation, and plant hormones play a key role in the plant strategies to prevent the harmful effects of water stress in crop development. The objective of this work was to investigate the effects of brassinosteroids (BRs) in rice development and yield under irrigation and under water deficit...
Article
Full-text available
Abiotic stresses negatively affect crop development and yield. However, the use of seaweed extracts can alleviate production losses through improvement of the antioxidant system and synthesis of compatible osmolytes. The aim of this study was to assess the effects of Ascophyllum nodosum extract on antioxidant response and yield of common bean plant...
Article
Blossom-end rot (BER) is a physiological disorder that can affect 100% of the fruit crop depending on the genotype. Tomato varieties with elongated fruit usually have a greater susceptibility to BER than other varieties. To evaluate and identify the possible physiological and morphological characteristics related to the onset of BER development, fo...
Article
Full-text available
Sweet sorghum has gained attention in tropical and subtropical regions because of its potential as a bioenergy crop. The present research was carried out to evaluate the physiological, biochemical and nutritional characteristics of sweet sorghum submitted to six plant growth regulators (thiamethoxam, biostimulant mixture, gibberellic acid, chlormeq...
Article
The use of plant growth regulators is directly related to the success of in vitro propagation, which is an advantageous alternative to obtain seedlings on a commercial scale. This study aimed to evaluate the in vitro development of ‘IAC 95-5000’ sugarcane seedlings after the addition of different doses of ethephon (0, 25, 50, 100 and 200 mg L-1) or...
Article
Full-text available
The use of plant growth regulators is directly related to the success of in vitro propagation, which is an advantageous alternative to obtain seedlings on a commercial scale. This study aimed to evaluate the in vitro development of 'IAC 95-5000' sugarcane seedlings after the addition of different doses of ethephon (0, 25, 50, 100 and 200 mg L-1) or...
Article
Full-text available
ANÁLISE DE CRESCIMENTO DE MUDAS DE PIMENTÃO ‘IKEDA’TRATADAS COM FERTILIZANTES E BIORREGULADOR
Article
Full-text available
RESUMO A conservação de tangor 'Murcott' [Citrus reticulata Blanco x C. sinensis (L.) Osbeck], sob baixa temperatura per-mite prolongar seu período de maturação comercial. A utiliza-ção de biorreguladores possibilita aumentar a vida útil de fru-tos cítricos submetidos à refrigeração. O objetivo deste traba-lho foi verificar o efeito da aplicação de...
Book
Full-text available
A utilização de aminoácidos na agricultura tem sido praticada por várias décadas, no Brasil e no mundo, em diversas culturas. O número de empresas, ofertando no comércio uma ampla gama de produtos, à base de aminoácidos, vem aumentando consideravelmente. Muitos técnicos e produtores relatam benefícios na utilização destes produtos. Entretanto, exis...
Article
Full-text available
Agricultural crop performance can be improved with use of seaweed extracts. The aim of this study was to evaluate the effects of Ascophyllum nodosum extract on biometric, biochemical and yield parameters of the wheat. The experimental design was completely randomized with 3 treatments [control (water), seed treatment (0.1 mL of the A. nodosum extra...
Article
We investigated some physiological and biochemical effects promoted by the insecticide thiamethoxam on rice crops. Two experiments were carried under pest-free conditions, in the greenhouse, with thiamethoxam at doses of: 0, 17.5, 35.0, 70.0 and 105.0 g a.i. per 100 kg of seeds. In order we check the physiology, biochemistry and production. In the...
Article
Full-text available
The aim of this study was to evaluate the effect of isolated and combined applications of gibberellic acid (gibberellin), indolbutyric acid (auxin) and kinetin (cytokinin) on vegetative and reproductive development of tomato test plants (Solanum lycopersicum cv. Micro-Tom), to better elucidate the interactions among these hormonal classes. The foll...
Article
Full-text available
The use of stimulating pastes aims to increase the rate of resin flow and its time of duration. In the Forest Experiment Station of Itatinga, Sao Paulo state, 159 trees of Pinus elliottii var. elliottii were were submitted to the treatments with 5 stimulant pastes, (Red Alchem, Paste with Ethephon Planebras, Black Resin Brazil, Red Eldorado and Tes...
Article
Full-text available
This study investigated the effects of using increasing doses of thiamethoxam, a neonicotinoid insec-ticide, applied as seed treatment, on the physiological, biochemical and nutritional composition of Brachiaria brizanthacv. Piata˜. We conducted two experiments with B. brizanthain a greenhouse, in the absence of insects. Biometric parameters and nu...
Article
Full-text available
Homogeneous stands can be obtained with the use of seaweed extracts on seeds, providing better establishment in the field and reducing losses in the production. The objective of this study was to evaluate the effects of Ascophyllum nodosum extract on the germination, vigor and early development of ‘Alvorada’ bean seeds. The seeds were immersed in a...
Article
Full-text available
The plant growth regulators can improve the crop performance, making the plant architecture more adapted and efficient in order to use environmental resources and inputs to support the high-yielding agronomic traits. The objective of this study was to evaluate the effects of three growth reducers on the sweet sorghum development. The experimental d...
Article
A fungicide composed of a triazole (cyproconazole), a strobilurin (azoxystrobin) and a mineral oil (nimbus) is used for disease control, Asian Rust mainly, currently considered one of the major soybean diseases in Brazil. With the purpose of studying the effect of the fungicide and its constituents on histological characteristics of soybean (Glycin...
Article
Full-text available
Thiamethoxam is a systemic insecticide from the neonicotinoid group, nitroguanidin family which affects the nicotinic receptor acetyl choline in the insect membrane, wounding the nervous system and causing the death of the insect. It was used with success in the control of initial pests of several crops. It was considered that thiamethoxam has a bi...
Article
Full-text available
Esse trabalho objetivou avaliar o crescimento inicial das raízes de trigo e arroz, submetidas a doses crescentes do tiametoxam. As doses do bioativador foram 0; 8,75; 17,5; 35 e 70 g i.a. por 100 kg de sementes para trigo e 0; 17,5; 35; 70 e 105 g i.a. por 100 kg de sementes para arroz, aplicadas via tratamento de sementes, com cultivo em mini-rizo...
Article
Full-text available
Mutant of dwarf rice (Oryza sativa L.) were treated with three different concentrations of gibberellic acid originated from two sources (Gibberellin and Pro-Gibb) and submitted to the determination of bigger height, in relation to the soil leveI. Mensurations were realized in each seven days at greenhouse conditions under mean temperature of 25°C....
Conference Paper
Full-text available
The research aimed to evaluated the bio-activator action of the molecule of thiamethoxam on the Brachiaria crops at doses: 0; 17,5; 35; 70 e 140 g a. i./100 kg-1 seeds, to sowing in long pots (3 dm-3) to perform the analysis of root growth and nitrate reductase activity, and large vessels (20 dm-3) for analysis of biometric variables and crude prot...
Article
Treating seeds with pesticides is a practice that confers seedlings protection against pests and diseases, however little research has been carried out on the physiological effects generated by these products during the life cycle of the plant. There is evidence that thiamethoxam promotes greater vigor to plants yielding greater crop production. Th...
Article
Full-text available
The purpose of this research was to evaluate the effects of MBTA (N,N-diethyl-2-(4-metylbenzyloxy) ethylamine hydrochloride) bioregulator applied on different times and concentrations on the yield and fruit quality of 'Pera' sweet orange. In two consecutive harvest seasons, the MBTA was sprayed in three different concentrations (8; 16 and 32 mg L-1...
Data
Full-text available
RESUMO O efeito do extrato aquoso de três plan¬ tas daninhas, Cynodon dactylon (L.)Pers., Cyperus rotundus L. e Sorghum halepense (L.) Pers. sobre a germinação e o cres-cimento de plântulas de arroz (Oryza sa¬ foi estudado, com a finalidade de investigar a sensibili-dade do arroz aos efeitos alelopáticos dessas plantas. Foram utilizados, na prepara...
Article
Full-text available
During the dry and rainy seasons, determinations of stomatal resistance and transpiration of five tropical crops were carried out: guarana (Paullinia cupana Kunth), coffee (Coffea arabica L.), cashew (Anacardium occidentale L), guava (Psidium guajava L.) and rubber (Hevea brasiliensis Muell. - Arg.) trees. Experimental design was done at randomized...
Article
Full-text available
Effects of tiametoxam and fludioxonil in the roots of potato plants. The insecticides and fungicides generally are evaluated for its efficiency in the pests and disease control. However, in some cases, it can promote physiological effects that modify the morphology and the physiology of the crops. These effects have not been properly evaluated. Som...
Article
Full-text available
Three month old Coleus blumei plants in pots were t reated with different NaCl concentrations: 0.00, 0. 25, 0.50 and 1.00%. To determine the water osmotic absorption, t he plants had their stems cut at 10 cm from the soi l surface. The remaining stems were linked to glass tubes by f lexible rubber tubes. Readings of the water column level in the gl...
Article
Full-text available
RESUMO - Objetivando avaliar os efeitos de diferentes combinações de NPK, com e sem calagem, sobre as carac- terísticas físicas e químicas do látex e as condições de ex- plotação da seringue ira (Hevea sp.), clone RRIM 600, foi conduzido um experimento em blocos casualizados com parcelas subdivididas contendo oito tratamentos: sem adu- bação e sem...
Article
Full-text available
The objective of this study was to evaluated physiological latex characteristics and the tapping systems of the clone RRIM 600 of rubber tree (Hevea sp.) an experiment was conducted with continuous supply NPK fertilizers with or without lime. The experiment was conducted in a randomized split-plot design with eight treatments: without fertilizer an...
Article
Full-text available
Procurou-se estudar o efeito da utilização de embalagem de polietileno durante o armazenamento refrigerado de frutos de caquizeiro (Diospyros kaki L.), cultivar Giombo. Os frutos foram acondicionados em sacos de PEBD (0,06mm) e mantidos a 1 ± 0,5ºC e 95-98% UR durante 30; 60 ou 90 dias. As características químicas e físicas dos frutos foram avaliad...
Article
CAMILO LÁZARO MEDINA 2 e EDUARDO CARUSO MACHADO 4 RESUMO Avaliou-se o efeito dos biorreguladores Fenotiol 10 mg L -1 ; Fengib 1 mL L -1 ; Brassinolide 0,015 mg L -1 ; GA 3 20 mg L -1 ; 2,4-D 8 mg L -1 e GA 3 20 mg L -1 + 2,4-D 8 mg L -1 na fixa-ção dos frutos da lima ácida 'Tahiti' [Citrus latifolia (Yu. Tanaka) Tanaka]. Os tratamentos foram aplica...
Article
Full-text available
The objective of this work was evaluated the effects of NPK application on soil fertility and dry matter rubber production of clone RRIM 600. The experiment was conducted in a design randomized split-plot with eight treatments: without fertilizer and without lime (T1), without fertilizer+lime (T2), N1P1K0+lime (T3), N2P2K0+lime (T4), N1P1K1+lime (T...
Article
Full-text available
O mamão (Carica papaya L.) é uma fruta altamente perecível devido ao rápido amadurecimento após a colheita. A busca de técnicas que ampliem o período de conservação e reduzam as perdas pós-colheita é desejável. Mamões 'Sunrise Solo' foram colhidos em dois estádios de maturação (verde e maduro) e tratados com o antagonista competitivo do etileno 1-m...
Article
Full-text available
O objetivo deste trabalho foi avaliar o efeito de diferentes temperaturas durante o período de exposição ao vapor de álcool etílico sobre a qualidade dos frutos de caquizeiro cultivar Giombo. Os frutos foram expostos ao vapor de álcool etílico durante 42 horas, sob temperaturas de 10, 20 ou 30°C e 95% de umidade relativa. As características química...
Article
Full-text available
A floração nos citros, assim como em outras fruteiras, é um dos fatores determinantes para a produção. A possibilidade de inibição ou redução da florada normal e alteração da época de produção para a lima 'Tahiti' é fator primordial para determinar sua rentabilidade econômica. O presente trabalho teve como objetivo avaliar o efeito do ácido giberél...
Article
Full-text available
Para caracterizar evidências indiretas do envolvimento dos glicosídeos cianogênicos da seringueira, cujo principal componente é a linamarina, no desenvolvimento dos sintomas de incompatibilidade de enxertia por translocação apresentados pelo clone de painel IPA 1 (Hevea brasiliensis) em enxertos de copa com vários clones de outras espécies de Hevea...
Article
Full-text available
Verificou-se a influência da utilização de embalagem de polietileno, durante o armazenamento refrigerado, sobre o processo de remoção da adstringência de frutos de caquizeiro (Diospyros kaki L.), bem como sobre a qualidade dos frutos. Caquis 'Giombo' foram mantidos em câmara refrigerada a 1°C e 95-98% UR, embalados ou não em polietileno de baixa de...
Article
RESUMO O uso de biorreguladores é uma prática agrícola que vem ganhando grande espaço na citricultura brasileira. Na lima ácida 'Tahiti' (Citrus latifolia Tanaka) essas substân-cias visam obter a produção de mudas por estacas, inibição e indução do florescimento, aumento da frutificação e do tamanho do desbaste, prolongamento da vida útil dos fru-t...
Article
Full-text available
Este trabalho teve como objetivos comparar o crescimento de raízes de cana colhida crua, mecanizada e de cana após a queima, colhida manualmente; avaliar a influência do clima sobre as duas condições de crescimento e analisar o comportamento do crescimento de raízes de cana crua e cana queimada nos 1º e 2º anos de rebrota, através de curvas adaptad...
Article
Full-text available
O objetivo deste trabalho foi avaliar o efeito do período de exposição ao vapor de álcool etílico na remoção da adstringência de frutos de caquizeiro (Diospyros kaki L.) cultivar Giombo. Os frutos foram expostos ao vapor de álcool durante 24, 36 e 48 horas, sob temperatura de 20°C e 95% de umidade relativa. As características químicas e físicas dos...
Article
Full-text available
The purpose of this research was to study the effect of exposure period to ethyl alcohol vapor on astringency removal of persimmon fruits (Diospyros kaki L.) cv. Giombo. Fruits were exposed to alcohol vapor for 24, 36 and 48 hours at 20°C and 95% RH. Chemical and physical characteristics of fruits were measured for ten days, at two day intervals. S...
Article
Full-text available
Two experiments were carried out in a greenhouse to evaluate the variability in macronutrient contents in relation to growth regulator sprays on ‘Thompson Seedless’ and ‘Italia’ grapevines. The treatments were: chlormequat - 1,500mg L-1; daminozide - 3,000mg L-1; uniconazole - 30mg L-1; mepiquat chloride - 300mg .L-1 and control. The cuttings were...
Article
Two experiments were carried out in a greenhouse to evaluate the variability in macronutrient contents in relation to growth regulator sprays on ?Thompson Seedless? and ?Italia? grapevines. The treatments were: chlormequat - 1,500mg L-1; daminozide - 3,000mg L-1; uniconazole - 30mg L-1; mepiquat chloride - 300mg .L-1 and control. The cuttings were...
Article
Full-text available
O presente trabalho teve como finalidade analisar os efeitos da aplicação de giberelina (GA) e do ethephon (CEPA) na anatomia de plantas de cana-de-açúcar. Para o estudo da anatomia de caules e folhas foi realizada pulverização de plantas jovens a partir de sementes. Após 216 dias da semeadura, realizaram-se cortes das folhas +4, da região do nó +1...
Article
This research was carried out to study the effects of gibberellin (GA 50 mg L-1) and ethephon (CEPA 1,200 mg L-1) on the anatomy of sugar cane. Seed derived seedlings were sprayed with the growth regulators. Various plant parts (+4 leaves, +10 node, and +10 internode) were harvested at 216 days after sowing, sectioned and mounted on permanent slide...
Article
O objetivo do presente trabalho foi verificar os efeitos dos reguladores vegetais GA3 50 mg.l-1, NAA 100 mg.l-1, CCC 1500 mg.l-1 e SADH 3000 mg.l-1 em folhas de tomate, Lycopersicon esculentum Mill. cv. 'Ângela Gigante'. Os promotores de crescimento aumentaram o número de estômatos por milímetro quadrado na epiderme adaxial e diminuíram o número de...
Article
Full-text available
Este trabalho teve como objetivos: 1. comparar o crescimento de cana colhida crua, mecanizada e de cana após a queima, colhida manualmente; 2. avaliar a influência do clima sobre as duas condições de crescimento e 3. analisar o comportamento do crescimento de cana crua e cana queimada nos 1º e 2º anos de rebrota, através de curvas adaptadas. A pesq...
Article
Full-text available
The effects of plant growth regulators GA3 50 mg. L-1, NAA 100 mg. L-1, CCC 1500 mg.L-1 and SADH 3000 mg.L-1 on stem anatomy of Lycopersicon esculentum Mill cv. Ângela Gigante were studied. Two sets of experiments were carried out in greenhouse during two separte periods. Anatomical studies , revealed that growth promotors induced increased xylem t...
Article
Full-text available
O experimento, realizado no Horto Experimental do Departamento de Botânica da Escola Superior de Agricultura "Luiz de Queiroz", teve por finalidade promover o desenvolvimento precoce de porta-enxertos de Macadamia integrifolia visando abreviar a produção de mudas. As plantas de nogueira-macadâmia com 4 meses de idade (120 D.A.S.) foram pulverizadas...
Article
Full-text available
This study investigates the effects of growth substances on the growth of macadamia-nut rootstocks and the possibility of shortening the period of time plant formation on nursery. Four-month-old rootstocks were sprayed with gibberellic acid 50, 100, 250 and 500 ppm, naphtalenacetic acid 50, 100, 250 and 500 ppm, gibberellic acid 100 ppm plus naphta...