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Base temperature for leaf appearance and phyllochron of selected strawberry cultivars in a subtropical environment Bragantia
Rosa,Hamilton Telles; Walter,Lidiane Cristine; Streck,Nereu Augusto; Andriolo,Jerônimo Luiz; Silva,Michel Rocha da; Langner,Josana Andréia.
Leaf development is characterized by the appearance of new leaves and is related to crop leaf area index, which affects the interception of solar radiation used for photosynthesis and biomass production and ultimately defines crop yield. The objectives of this paper were to estimate the base temperature for leaf appearance and to determine the phyllochron of two strawberry cultivars considering several planting dates. A two-year field experiment was conducted during 2008 and 2009 in Santa Maria (RS). The cultivars Arazá (early) and Yvapitá (late) were used at three planting dates in both years. Base temperature (Tb) was estimated using the Mean Square Error (MSE) approach of the regression between accumulated leaf number (LN) and accumulated thermal time...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fragaria x ananassa; Leaf development; Plant development; Temperature; Thermal time.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400029
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Containers of Attalea funifera fibers to produce eucalyptus seedlings PFB - Pesquisa Florestal Brasileira
Mendonça, Andrea Vita Reis; Ribeiro, Lucas Gonçalves; Assunção, José Roque Azevedo; Freitas, Teresa Aparecida Soares de; Souza, Josival Santos.
The aim of this study was to assess the technical feasibility of using biodegradable containers made of fiber waste of Attalea funifera Martius to produce seedling of Eucalyptus camaldulensis Dehnh. The work was carried out in three stages: manufacture of piassava fiber containers, seedling production and field simulation. The experiment of seedling production was in completely randomized design, with two treatments (polyethylene tube and biodegradable container) and 10 repetitions, with 64 seedlings per repetition. After 93 days, seedlings were evaluated based on quality variables. The simuation of initial growth of seedlings in the field consisted in planting seedlings in containers of 11L, in completely randomized design, with three treatments:...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant development; Piaçava da Bahia; Forest nursery Recursos Florestais; Silvicultura; Viveiros Desenvolvimento de planta Piaçava da Bahia Viveiro florestal.
Ano: 2016 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1186
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Effect of soybean ureases on seed germination and plant development Genet. Mol. Biol.
Rechenmacher,Ciliana; Wiebke-Strohm,Beatriz; Oliveira-Busatto,Luisa A. de; Polacco,Joseph C.; Carlini,Célia R.; Bodanese-Zanettini,Maria H..
Abstract Urease catalyzes the hydrolysis of urea to ammonia and carbon dioxide. The ammonia (nitrogen (N) product of urease activity) is incorporated into organic compounds. Thus, urease is involved in N remobilization, as well as in primary N assimilation. Two urease isoforms have been described for soybean: the embryo-specific, encoded by the Eu1 gene, and the ubiquitous urease, encoded by Eu4. A third urease-encoding gene was recently identified, designated Eu5, which encodes the putative protein product SBU-III. The present study aimed to evaluate the contribution of soybean ureases to seed germination and plant development. Analyses were performed using Eu1/Eu4/Eu5-co-suppressed transgenic plants and mutants of the Eu1 and Eu4 urease structural genes,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant development; Functional study; Transgenic plants; Mutants; Urease.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572017000200209
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Eficiencia de las rizobacterias promotoras del crecimiento vegetal (RPCV) en plántulas de caña de azúcar (Saccharum spp.). Colegio de Postgraduados
Morgado González, Antonio.
Las Rizobacterias Promotoras de Crecimiento Vegetal (RPCV) son una alternativa en la nutrición de plantas cultivadas, ya que estimulan su crecimiento y rendimiento, mejorando la absorción de nutrimentos, el aumento en su movilización, la producción de antibióticos y de reguladores de crecimiento. La caña de azúcar (Saccharum spp.) es un cultivo muy demandante de nutrimentos y de alto rendimiento en México, el uso de las RPCV es fundamental para mejorar su rentabilidad. En esta investigación, se evaluó la efectividad en producción de índoles totales por el método Salkowski, solubilización de fosfatos con medio Pikovskaya de 24 cepas bacterianas de siete especies, y su impacto en el desarrollo de vitroplantas de caña de azúcar de la variedad Mex 69-290 al...
Palavras-chave: Nutrición vegetal; Biofertilizantes; Desarrollo; Fosfatos solubles; Fitohormonas; Plant nutrition; Biofertilizers; Plant development; Soluble phosphates; Plant growth regulators; Fisiología Vegetal; Maestría.
Ano: 2013 URL: http://hdl.handle.net/10521/2078
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Germinação de duas espécies da caatinga sob déficit hídrico e salinidade PFB - Pesquisa Florestal Brasileira
Santos, Cibele Alves dos; Silva, Natália Vaz da; Walter, Letícia Siqueira; Silva, Elaine Cristina Alves da; Nogueira, Rejane Jurema Mansur Custódio.
A germinação é uma das etapas de desenvolvimento do vegetal e para que a mesma ocorra, a presença da água é de fundamental importância. Porém, plantas que precisam se desenvolver em solos de regiões áridas e semiáridas se deparam com solos salinizados ou com pouca água disponível. Portanto, a presente pesquisa objetivou avaliar a germinação de sementes de catingueira e angico submetidas a condições de estresse salino e hídrico. Foram utilizadas sementes de Poincianella pyramidalis e Anadenanthera colubrina submetidas à salinidade, induzida pelos cloretos de cálcio e de sódio e à deficiência hídrica, induzida pelo PEG 6000, tendo o rolo de papel como substrato. Os tratamentos foram: controle (água destilada), -0,4MPa (NaCl, CaCl2 e PEG), -0,8MPa (NaCl,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recursos Florestais; Botânica; Fisiologia Vegetal Poincianella pyramidalis; Anadenanthera colubrina; Polietilenoglicol; Cloreto de sódio; Cloreto de cálcio Poincianella pyramidalis; Anadenanthera colubrine; Plant development.
Ano: 2016 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1017
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Growth Analysis of Chloris elata Planta Daninha
CORREIA,N.M.; RESENDE,I..
ABSTRACT: In Brazil, in agricultural areas where there is no establishment of cover crops in the off season, as well as in citrus orchards in the state of São Paulo, an increase in the infestation of Chloris elata has been observed. This is a perennial species, propagated by seeds and short rhizomes, erect and slightly caespitose. With the objective of evaluating the growth and development of plants from two accessions of C. elata, a greenhouse experiment was conducted. The experimental design was completely randomized, in a 2 (accessions of C. elata) x 15 (evaluation periods) factorial arrangement, with four replications. Fifteen destructive evaluations were performed 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91, 98, 112 and 126 days after sowing (DAS)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Biotype; Tall windmill grass; Plant development.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582018000100328
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Growth and productive responses of tropical grass Panicum maximum to nitrate and ammonium supply R. Bras. Zootec.
Santos,Jorge Henrique da Silva; Bona,Fabiano Daniel De; Monteiro,Francisco Antonio.
This study was conducted to investigate growth response parameters and forage yield of Panicum maximum Jacq. plants supplied with nitrate (NO3-) and ammonium (NH4+) as N source in a nutrient solution. Six NO3- and NH4+ combinations were tested at the following proportions: 100-0, 85-15, 70-30, 55-45, 40-60 and 25-75%. Grass shoot (number of tillers and leaves and leaf surface area) and root (length and surface area) growth parameters and dry matter production exhibited highest values in P. maximum plants growing in the nutrient solution supplied with NO3-:NH4+ at the proportions ranging between approximately 70-30 and 55-45%. The use of NO3-:NH4+ mixture at the ratio of 55-45% instead of the NO3- solely as N source in the nutrient solution enhanced the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Forage production; Nitrogen nutrition; Nitrogen-use efficiency; Plant development; Tillering.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900003
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Identification and characterization of homeobox genes in Eucalyptus Genet. Mol. Biol.
Rocha,Graça Celeste Gomes; Corrêa,Régis Lopes; Borges,Anna Cristina Neves; Sá,Claudio Bustamante Pereira de; Alves-Ferreira,Márcio.
Homeobox genes encode transcriptional factors, usually involved in molecular control of plant developmental patterns. They can be divided into several classes according to conserved sequences within the homeobox region and the presence of specific additional sequences. Based on these conserved sequences, we developed a search procedure to identify possible homeobox genes in the Eucalyptus Genome Sequencing Project Consortium (FORESTs) database. We were able to identify 50 Eucalyptus sequences (EST-contigs) containing the homeodomain sequence. Phylogenetic analysis was applied to this ESTs-contigs and 44 of them were found to have similarities with one of three well-known homeobox classes: Bell, Knox and HD-Zip, and their sub-classes. However, no EST-contig...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant development; Abiotic stress; Eucalyptus; FORESTs; Phylogenetic analysis.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572005000400005
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Interspecific Competition Between Sweet Sorghum and Weeds Planta Daninha
GIANCOTTI,P.R.F.; NEPOMUCENO,M.P.; OLIVEIRA,T.S.; COSTA,C.; ALVES,P.L.C.A..
ABSTRACT: While evidence is mounting that sweet sorghum [Sorghum bicolor (L.) Moench], an ethanol crop, may provide an alternative to sugarcane (Saccharum officinarum L.) on sugarcane lands under rehabilitation, little is known of its under production limiting factors (e.g., interspecific competition with weeds). Accordingly, the aim of the present study was to identify the initial mutual interspecific competition between sweet sorghum hybrids and weeds in high infestation situations. The experiment was carried out in pots, using a 5 × 6 factorial design: (i) a sorghum-free control and four sweet sorghum hybrids (CVSW 81198, CVSW 80007, CVSW 80147 and XBSW 82158), besides a control without sweet-sorghum, and (ii) five species of weeds [Cyperus rotundus L.,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Plant interference; Sorghum bicolor; Mucuna aterrima; Plant development.
Ano: 2019 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-83582019000100291
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Morfologia do fruto, das sementes e dos estádios iniciais de desenvolvimento de Helicostylis tomentosa PFB - Pesquisa Florestal Brasileira
Arruda, Yêda Maria Boaventura Corrêa; Ferraz, Isolde Dorothea Kossmann; Mendes, Angela Maria da Silva.
Os objetivos deste estudo foram analisar as características morfológicas complexas dos frutos e diásporos de inharé, e fornecer subsídios para o reconhecimento da planta na fase inicial do desenvolvimento. As infrutescências apresentam, em média, 2,2 cm x 2,9 cm x 2,6 cm, com 4-10 frutos inseridos ao perianto carnoso. Os frutos, drupas monospérmicas, apresentam um pericarpo fino-gelatinoso, que contem um pirênio globoso, levemente achatado, marrom opaco e liso medindo 0,9 cm x 0,8 cm x 0,6 cm. A semente exalbuminosa possui tegumento membranoso; o embrião é axial total e as reservas encontram-se nos cotilédones crassos e isófilos. A germinação é tipo hipógea criptocotiledonar; com a retirada do endocarpo, a protrusão da raiz primária ocorre após 10 dias da...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Recursos floretais; Botânica Plântulas; Germinação; Desenvolvimento da planta Seedlings; Germination; Plant development.
Ano: 2017 URL: http://pfb.cnpf.embrapa.br/pfb/index.php/pfb/article/view/1439
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Nutrient contents in camu-camu plants (Myrciaria dubia (Kunth) McVaugh) fertirrigateds with different doses of nitrogen Acta Agron. (Palmira)
Abanto-Rodríguez,Carlos; Chagas,Edvan Alves; da Silva Siqueira,Raphael Henrique; Araújo,Wellington Farias; Zborowski,Luiz Guilherme Carvalho; Souza,Caio César Pinho; Sakasaki,Roberto Tadashi; Lopes Monteiro Neto,João Luiz; Sánchez-Choy,José.
Abstract Camu-camu (Myrciaria dubia (Kunth) McVaugh) is a native fruit tree, which is in domestication process, therefore, knowledge of nutritional needs is essential to improve the fertilization efficiency throughout plant development. The aim of this research was to determine the nutrient content of camu-camu plants as a function of nitrogen fertilization via fertirrigation in the first year of cultivation. An experiment was carried out in a randomized complete block design, with 5 treatments as follows: 0; 40; 80; 120 and 160 kg.ha-1 of N, eight replicates and seven plants per experimental unit. The evaluated variables were as follows: total dry matter and nutrient contents in camu-camu leaves. The results show total dry matter of camu-camu plants,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Dry matter; Micronutrients; Nutrient balance (plants); Plant development; Plant nutrition.
Ano: 2018 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0120-28122018000100079
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Performance of Flooded Rice Grown in Succession to Winter Cover Crops Rev. Bras. Ciênc. Solo
Luz,Silmara da Correia; Silva,Paulo Regis Ferreira da; Boeni,Madalena; Bredemeier,Christian; Anghinoni,Ibanor; Menegati,Guilherme Batista; Maass,Matheus Barreto; Miozzo,Laís Correa.
ABSTRACT: Mean grain yield of flooded rice in southern Brazil has increased in recent years due to the use of high-yield cultivars and improvement of crop management practices. Nevertheless, stagnation in grain yields has been observed in some rice-producing regions. Adoption of conservation tillage systems based on cover crops may be a strategy to increase rice grain yield potential. The objective of the present study was to evaluate the effect of winter cover crops on initial establishment, development, and grain yield of flooded rice (Oryza sativa L.) grown under different fertilization levels and no-tillage. A field experiment was carried out for three consecutive years (2010/11, 2011/12, and 2012/13) in Cachoeirinha, Rio Grande do Sul, South Brazil....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Grain yield; Plant development; Fertilizer rate; Fertilization response.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100509
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Phyllochron and leaf appearance rate in oat Bragantia
Chaves,Gabriela Görgen; Cargnelutti Filho,Alberto; Alves,Bruna Mendonça; Lavezo,André; Wartha,Cleiton Antonio; Uliana,Daniela Barbieri; Pezzini,Rafael Vieira; Kleinpaul,Jéssica Andiara; Neu,Ismael Mario Márcio.
Abstract Phyllochron and leaf appearance rate are both important parameters in the production efficiency of agricultural crops. The objectives of this study were to determine the phyllochron and leaf appearance rate in 4 oat cultivars (Avena sativa L.) in 3 sowing dates and verify the variability of phyllochron and leaf appearance rate among cultivars and sowing dates. The experimental design was the completely randomized with 12 treatments and 20 repetitions. Treatments were formed by the combination of 4 cultivars (URS Charrua, URS Taura, URS Estampa, and URS Corona) and 3 sowing dates in 2014 (April 28, May 28, and July 14). In each plant (repetition) of each treatment, the number of expanded leaves (NEL) was counted 3 times per week from the first leaf...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Avena sativa L.; Plant development; Thermal time; Leaf emission.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052017000100073
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Plastochron index of 'Cabernet Sauvignon' and 'Chardonnay' grapevines in Fronteira Oeste, in the state of Rio Grande do Sul, Brazil PAB
Zeist,André Ricardo; Tomazetti,Tiago Camponogara; Rossarolla,Márcia Denise; Alberto,Cleber Maus; Giacobbo,Clevison Luiz; Welter,Leocir José.
Abstract: The objective of this work was to estimate the plastochron index of the 'Cabernet Sauvignon' and 'Chardonnay' grapevine varieties in Fronteira Oeste, in the state of Rio Grande do Sul, Brazil. The experiment was conducted in 2010, in a completely randomized design, using 'Cabernet Sauvignon' and 'Chardonnay' grapevines grown in the municipalities of Itaqui, São Borja, and Maçambará, which were referred to as sites 1, 2, and 3, respectively. Phenological monitoring of the varieties was done from the beginning of sprouting until the pruning of canes (green trimming). The daily thermal sum (dTS, oC day) was calculated using the cardinal temperatures for node appearance in grapevines (10, 25, and 35ºC), whereas the accumulated thermal sum (aTS, oC...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vitis vinifera; Degree-days; Plant development; Temperature; Thermal sum; Viticulture..
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000400244
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Simulating the vernalization response of the "Snow Queen" lily (Lilium longiflorum Thunb.) Scientia Agricola
Streck,Nereu Augusto; Schuh,Mariângela.
Vernalization is a process required by certain plant species, including lilies (Lilium spp.), to enter the reproductive phase, through an exposure to low, non-freezing temperatures. The objective of this study was to evaluate a nonlinear vernalization response function for the "Snow Queen" lily. An experiment was carried out in Santa Maria, RS, Brazil, to provide an independent data set to evaluate the performance of the model. Lily bulbs were vernalized at -0.5, 4.0, and 10ºC during two, four, six, and eight weeks. The daily vernalization rate (fvn) for each treatment was calculated with a beta function, and the effective vernalization days (VD) were calculated by accumulating fvn. The thermal time from plant emergence to visible buds at different VD...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Low temperature; Flowering; Bulb; Model; Plant development.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162005000200004
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Thidiazuron effects on shoot growth, return bloom, fruit set and nutrition of apples PAB
Amarante,Cassandro Vidal Talamini do; Ernani,Paulo Roberto; Blum,Luiz Eduardo Bassay; Megguer,Clarice Aparecida.
Apple (Malus domestica Borkh.) trees, cultivars Gala and Fuji, were sprayed at full bloom with thidiazuron (TDZ) at doses of 0, 5, 10, or 20 g ha-1 of a.i. in order to evaluate its effects on plant growth and development, return bloom, fruit set, nutrition, and fruit yield. Fruit set increased with TDZ dose in 'Gala' but not in 'Fuji'. TDZ did not affect fruit yield in any cultivar. In 'Gala', the return bloom was reduced in about 50% at TDZ doses of 10 or 20 g ha-1. TDZ increased shoot growth in both cultivars. In leaves, TDZ decreased the concentration of Ca and Mg in 'Gala' and of Mg in 'Fuji', but did not affect the chlorophyll content, leaf area, length, width, and dry mass per cm² regardless of cultivar. In fruits, the effect of TDZ varied according...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Malus domestica; Cytokinin; Phenylurea; Calcium; Fruit yield; Pollination; Plant development.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2002001000003
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