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Gladiolus development in response to bulb treatment with different concentrations of humic acids Desenvolvimento do gladíolo em resposta ao tratamento dos bulbos com diferentes concentra es de ácidos húmicos
Marihus Altoé Baldotto,Lílian Estrela Borges Baldotto
Revista Ceres , 2013,
Abstract: Gladiolus is an ornamental species produced for cut flowers and propagated by corms. The early flowering and increase in the number of flower buds, besides the production of commercial corms are constant challenges to be addressed in the crop improvement. Commercial production of ornamentals is technologically accelerated by means of growth regulators. Among them, the auxins stand out for their key role in the adventitious rooting and cell elongation. Alternatively, the humic substances present in the organic matter also have biostimulating effect, which is very similar to the auxinic effect. Therefore, this work aimed to study the growth and development of gladiolus in response to application of different concentrations of humic acids (HA) isolated from vermicompost. Corms were soaked for 24 hours in solutions containing 0, 10, 20, 30 and 40 mmol L-1 of C from HA. The corms were planted in 10-dm3 plastic bags filled with substrate and kept in a greenhouse. Growth of shoots and roots was evaluated. The results showed that the use of HA accelerates growth, and anticipates and increases flowering of Gladiolus. O gladíolo é uma planta ornamental para a produ o de flores, cuja propaga o é realizada por bulbos. A antecipa o do florescimento e o aumento do número de bot es florais, além da produ o de bulbos comerciais, s o problemas constantes a serem equacionados na cultura. A produ o comercial de plantas ornamentais é tecnologicamente acelerada por meio de reguladores de crescimento. Dentre eles, vêm-se destacando as auxinas, horm nios vegetais com a o no enraizamento adventício e no alongamento celular. Alternativamente, as substancias húmicas da matéria organica apresentam, também, efeito bioestimulante, muito semelhante ao efeito auxínico. Por essas raz es, este trabalho teve como objetivo estudar o crescimento e desenvolvimento do gladíolo, em resposta à aplica o de diferentes concentra es de ácidos húmicos (AH), isolados de vermicomposto. Os bulbos foram imersos, por 24 horas, em solu es contendo 0, 10, 20, 30 e 40 mmol L-1 de C de AH. Em seguida, foram plantados em sacolas plásticas de 10,0 dm3, contendo substrato e mantidos em casa de vegeta o. Foram avaliadas características de crescimento da parte aérea e do sistema radicular. Os resultados obtidos permitiram concluir que o uso de AH acelera o crescimento, antecipa e aumenta a flora o do gladíolo.
Root growth of Arabidopsis thaliana (L.) Heynh. treated with humic acids isolated from typical soils of Rio de Janeiro state, Brazil
Baldotto, Marihus Altoé;Muniz, Rafael Carvalho;Baldotto, Lílian Estrela Borges;Dobbss, Leonardo Barros;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000400015
Abstract: humic substances isolated from soil organic matter had been used as stimulators of plant metabolism. arabidopsis thaliana (l.) heynh. with only five chromosomes, short cycle and size, is an important model to evaluate the physiological effects of these substances, which are qualitatively and quantitatively influenced by morphogenesis, mineralogy and chemistry of soils. the objective of this study was to evaluate the ambience effects on bioactivity of humic acids. a and b horizons of four typical soils of the north fluminense were sampled. after isolation and purification, humic acids were applied to plants in increasing concentrations. the number and length of lateral roots and main root length were evaluated and, subsequently, the concentrations of maximum stimulation were determined by dose-response curves and regression equations. the results showed that more stable humic acids isolated from soil in less advanced stages of weathering, high activity clay and high base saturation resulted in better physiological stimulants for arabidopsis.
Initial performance of maize in response to NPK fertilization combined with Herbaspirillum seropedicae
Baldotto, Marihus Altoé;Baldotto, Lílian Estrela Borges;Santana, Rogério Batista;Marciano, Cláudio Roberto;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000600015
Abstract: the inoculation with plant growth-promoting bacteria can be a technological approach useful for increasing the production of maize. the objective of this study was to evaluate the initial performance of maize in response to application of doses of npk combined with the inoculation of the diazotrophic bacteria herbaspirillum seropedicae in an greenhouse experiment. the experiment consisted of six fertilizer levels: 0, 25, 50, 75, 100 and 200% of the recommended dose of npk applied to maize inoculated and non-inoculated with h. seropedicae. at 30 days after the treatment application, the growth characteristics and nutritional status of the plants were evaluated. plant development was influenced by fertilization, but it was enhanced by combination with the bacteria, which resulted in significant increases in the dry mass of shoots (7%) and leaf area (9%) when compared with non-inoculated plants. the results showed increases in the concentration of n (11%), p (30%) and k (17%) of maize plants in response to bacterial inoculation together with npk compared with plants that were applied fertilize only. the greater consistency and stability response of the host plant to bacterization in the presence of chemical fertilizer indicate a promissory biotechnological approach for improving the initial growth and adaptation of maize to the cultivation environment.
Initial performance of maize in response to NPK fertilization combined with Herbaspirillum seropedicae Desempenho inicial do milho, em resposta à aduba o NPK combinada com a inocula o de Herbaspirillum seropedicae
Marihus Altoé Baldotto,Lílian Estrela Borges Baldotto,Rogério Batista Santana,Cláudio Roberto Marciano
Revista Ceres , 2012,
Abstract: The inoculation with plant growth-promoting bacteria can be a technological approach useful for increasing the production of maize. The objective of this study was to evaluate the initial performance of maize in response to application of doses of NPK combined with the inoculation of the diazotrophic bacteria Herbaspirillum seropedicae in an greenhouse experiment. The experiment consisted of six fertilizer levels: 0, 25, 50, 75, 100 and 200% of the recommended dose of NPK applied to maize inoculated and non-inoculated with H. seropedicae. At 30 days after the treatment application, the growth characteristics and nutritional status of the plants were evaluated. Plant development was influenced by fertilization, but it was enhanced by combination with the bacteria, which resulted in significant increases in the dry mass of shoots (7%) and leaf area (9%) when compared with non-inoculated plants. The results showed increases in the concentration of N (11%), P (30%) and K (17%) of maize plants in response to bacterial inoculation together with NPK compared with plants that were applied fertilize only. The greater consistency and stability response of the host plant to bacterization in the presence of chemical fertilizer indicate a promissory biotechnological approach for improving the initial growth and adaptation of maize to the cultivation environment. A inocula o de bactérias promotoras de crescimento de plantas pode ser uma abordagem tecnológica útil para aumentar a produ o de milho. O objetivo deste trabalho foi avaliar o desempenho inicial de plantas de milho, em resposta à aplica o de doses de NPK combinadas com a inocula o da bactéria diazotrófica Herbaspirillum seropedicae, em experimento em casa de vegeta o. A matriz experimental consistiu em seis níveis de aduba o: 0, 25, 50, 75, 100 e 200 % da dose de NPK recomendada, aplicados em plantas de milho inoculadas e n o inoculadas com H. seropedicae. Aos 30 dias após a aplica o dos tratamentos, foram avaliadas as características de crescimento e nutricionais das plantas. O crescimento do milho foi influenciado pela aduba o, mas foi refor ado pela combina o com a bactéria, que resultou em aumentos significativos na matéria seca da parte aérea (7 %) e área foliar (9 %), quando comparado com as das plantas n o inoculadas. Os resultados indicaram incrementos no acúmulo de N (11 %), P (30 %) e K (17 %), em plantas de milho, em resposta à inocula o bacteriana em conjunto com NPK, quando comparado com os das plantas que apenas receberam aduba o. A estabilidade e maior consistência da resposta da pl
Sele??o de bactérias promotoras de crescimento no abacaxizeiro cultivar Vitória durante a aclimatiza??o
Baldotto, Lílian Estrela Borges;Baldotto, Marihus Altoé;Olivares, Fábio Lopes;Viana, Alexandre Pio;Bressan-Smith, Ricardo;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000200008
Abstract: pineapple (ananas comosus l. merrill) in vitro propagation results in the production of a large quantity of healthy and homogeneous plantlets. despite these advantages, the long time required for acclimatization makes this agricultural practice too costly. growth acceleration of plantlets by inoculation with endophytic and epiphytic diazotrophic bacteria may be useful to reduce this period. the objectives of this study were to evaluate the potential of 20 diazotrophic bacteria strains in synthesizing indole, solubilizing ca phosphate and zn oxide and acting against the fungus fusarium subglutinans f. sp. ananas, and subsequently, evaluate the performance of pineapple 'vitória' propagated by tissue culture in response to the application of these isolates during the acclimatization period in a greenhouse. shoot and root growth characteristics and leaf nutrient content of pineapple were evaluated. results showed differences in the ability of the bacteria strains to synthesize indole, solubilize ca phosphate and zn oxide and act against fusarium. differences in the growth-promoting capacity of the shoot and root system of bacteria and leaf accumulation of n, p, k, ca and mg in pineapple were also shown. inoculation with diazotrophic bacteria can promote the growth of plantlets during the acclimatization period, improving the adaptation of pineapple to the ex-vitro environment
Growth promotion of pineapple 'vitória' by humic acids and burkholderia spp. during acclimatization
Baldotto, Lílian Estrela Borges;Baldotto, Marihus Altoé;Canellas, Luciano Pasqualoto;Bressan-Smith, Ricardo;Olivares, Fábio Lopes;
Revista Brasileira de Ciência do Solo , 2010, DOI: 10.1590/S0100-06832010000500012
Abstract: in vitro propagation of pineapple produces uniform and disease-free plantlets, but requires a long period of acclimatization before transplanting to the field. quicker adaptation to the ex vitro environment and growth acceleration of pineapple plantlets are prerequisites for the production of a greater amount of vigorous, well-rooted planting material. the combination of humic acids and endophytic bacteria could be a useful technological approach to reduce the critical period of acclimatization. the aim of this study was to evaluate the initial performance of tissue-cultured pineapple variety vitória in response to application of humic acids isolated from vermicompost and plant growth-promoting bacteria (burkholderia spp.) during greenhouse acclimatization. the basal leaf axils were treated with humic acids while roots were immersed in bacterial medium. humic acids and bacteria application improved shoot growth (14 and 102 %, respectively), compared with the control; the effect of the combined treatment was most pronounced (147 %). likewise, humic acids increased root growth by 50 %, bacteria by 81 % and the combined treatment by 105 %. inoculation was found to significantly increase the accumulation of n (115 %), p (112 %) and k (69 %) in pineapple leaves. pineapple growth was influenced by inoculation with burkholderia spp., and further improved in combination with humic acids, resulting in higher shoot and root biomass as well as nutrient contents (n 132 %, p 131 %, k 80 %) than in uninoculated plantlets. the stability and increased consistency of the host plant response to bacterization in the presence of humic substances indicate a promising biotechnological tool to improve growth and adaptation of pineapple plantlets to the ex vitro environment.
Initial growth of maize in response to application of rock phosphate, vermicompost and endophytic bacteria
Baldotto, Lílian Estrela Borges;Silva, Luiz Gonzaga Jr. Santos;Canellas, Luciano Pasqualoto;Olivares, Fábio Lopes;Baldotto, Marihus Altoé;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000200016
Abstract: due to the high energy requirement and demand for non-renewable resources for the production of chemical fertilizers, added also to the environmental impact caused by the use of such products, it is important to intensify research on bio-based agricultural inputs. the use of nitrogen-fixing endophytic and phosphate solubilizing bacteria can provide these nutrients to the plants from the air and poorly soluble phosphorus sources, such as phosphate rock. the objective of this study was to evaluate the nutrition and initial growth of maize (zea mays l.) in response to the inoculation of nitrogen-fixing and rock phosphate solubilizing endophytic bacteria, in single or mixed formulation, applied with vermicompost. the treatments containing bacteria, both diazotrophic and phosphate solubilizing, when compared to controls, showed higher levels of leaf nitrogen and phosphorus in maize, as well as higher growth characteristics. the application of vermicompost showed synergistic effect when combined with endophytic bacteria. thus, the innovation of the combination of the studied factors may contribute to the early development of maize.
Initial performance of pineapple and utilization of rock phosphate applied in combination with organic compounds to leaf axils
Baldotto, Marihus Altoé;Giro, Validoro Bazoni;Baldotto, Lílian Estrela Borges;Canellas, Luciano Pasqualoto;Velloso, Ary Carlos Xavier;
Revista Ceres , 2011, DOI: 10.1590/S0034-737X2011000300021
Abstract: rock phosphates have low solubility in water, but good solubility in acid. the use of organic compounds together with these phosphorus sources applied to the basal leaf axils of pineapple can increase the solubility of this phosfate source and increase the p availability to the crop. a greenhouse experiment was conducted using araxá rock phosphate (10 g) in combination or not with solutions containing increasing concentrations of humic acids (0 to 40 mmol l-1 of carbon), with or without citric acid (0.005 mmol l-1), applied to basal leaf axils of pineapple cv. pérola. growth and nutritional characteristics of aerial plant parts were assessed. growth rates of aerial parts and n, p, k, ca and mg contents increased curvilinearly with increasing concentration of carbon in the form of humic acids. maximum values were found for the concentration of 9.3 mmol l-1 of carbon combined with 0.005 mmol l-1 of citric acid and natural phosphate.
Adventitious rooting in cuttings of croton and hibiscus in response to indolbutyric acid and humic acid
Baldotto, Lílian Estrela Borges;Baldotto, Marihus Altoé;Soares, Raíssa Rezende;Martinez, Herminia Emilia Prieto;Venegas, Vitor Hugo Alvarez;
Revista Ceres , 2012, DOI: 10.1590/S0034-737X2012000400007
Abstract: adventitious rooting of ornamental plants can be accelerated by the application of growth regulators, such as auxin. humic acids, organic matter in soil and organic compounds also have a biostimulant effect. this work evaluated the rooting in cuttings of croton (codianeum variegatum l. rumph) and hibiscus (hibiscus rosa-sinensis l) in response to the application of different concentrations of indolbutyric acid (iba) and humic acid (ha). the experiment was carried out in a greenhouse. apical stem cuttings were treated with solutions at concentrations of: 0, 250, 500, 1000, 2000 mg l-1 iba and 0, 10, 20, 30, 40 mmol l-1 ha carbon isolated from vermicomposting. forty-five days after the applications, the cuttings were removed from the pots containing carbonized rice hull and the following variables were measured: rooting number, length and width of leaves, fresh and dry matter of root and aerial part and root area. the results were subjected to analysis of variance and the qualitative and quantitative effects of the treatments were compared by contrast and regression, respectively. regression equations were used to determine the maximum efficiency level of root dry matter according to iba and ha. higher accumulation of root dry matter was recorded for the treatments with the doses 579 mg l-1 iba and 14 mmol l-1 ha and 970 mg l-1 iba and 50 mmol l-1 ha for root cuttings of croton and hibiscus, respectively. it was found that the application of eiher iba or ha at the indicated doses accelerates rooting in cuttings of croton and hibiscus and contributes to the formation of vigorous plants.
Desempenho do abacaxizeiro 'Vitória' em resposta à aplica??o de ácidos húmicos durante a aclimata??o
Baldotto, Lílian Estrela Borges;Baldotto, Marihus Altoé;Giro, Validoro Bazoni;Canellas, Luciano Pasqualoto;Olivares, Fábio Lopes;Bressan-Smith, Ricardo;
Revista Brasileira de Ciência do Solo , 2009, DOI: 10.1590/S0100-06832009000400022
Abstract: the acclimatization of pineapple plantlets propagated by plant tissue culture is slow. the intensification of root growth by the use of humic acids may be useful during this process. the aim of this study was to evaluate the greenhouse acclimatization of 'vitória' pineapple propagated by plant tissue culture in response to different doses of humic acids isolated from vermicompost and filter cake. leaf anatomy, photosynthetic pigment content, shoot and root growth, and leaf nutrients were evaluated. an increase in growth and development of shoots and root system with the application of humic acids as well as a significant accumulation of n, p, k, ca, and mg and increase in the chlorophyll a / chlorophyll b ratio were found. growth promotion by the application of humic acids to plantlets during the period of acclimatization can improve their adaptation to the ex vitro environmental conditions.
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