Consulta: subjectFacets:"Plant hormones"
Registros recuperados: 7
Data/hora: 04/06/2024 12:44:10

Ethylene and fruit ripening: from illumination gas to the control of gene expression, more than a century of discoveries
Provedor de dados: 74
Autores: Chaves,Ana Lúcia Soares; Mello-Farias,Paulo Celso de.
The effects of ethylene on plants have been recognized since the Nineteenth Century and it is widely known as the phytohormone responsible for fruit ripening and for its involvement in a number of plant growth and development processes. Elucidating the mechanisms involved in the ripening of climacteric fruit and the role that ethylene plays in this process have been central to fruit production and the improvement of fruit quality. The biochemistry, genetics and physiology of ripening has been extensively studied in economically important fruit crops and a considerable amount of information is available which ranges from the ethylene biosynthesis pathway to the mechanisms of perception, signaling and control of gene expression. However, there is still much...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Climacteric fruits; Plant hormones; Ethylene biosynthesis; Ripening; Signal transduction.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572006000300020

Reproductive biology in monoecious and gynoecious cucumber cultivars as a result of IBA application
Provedor de dados: 75
Autores: Diola,Valdir; Orth,Afonso I; Guerra,Miguel P.
The understanding of both the reproductive biology and the regulation of the sexual expression of cucumber flowers (Cucumis sativus) makes crop management easier and can improve fruit yield and quality. The objective of this study was to evaluate the physiological answer of cucumber floral verticils to the application of IBA. The experiment was carried out in a greenhouse, in completely randomized blocks, with four replications of 4-plant plots, and treatments applied to a 5 x 2 factorial (0, 50, 100, 200, and 500 µmol of IBA, and two cultivars: Wisconsin MR28, gynoecious, and Caipira, monoecious). Cultivar Wisconsin MR28 produced in average 7,636 pollen grains (PG) per flower, with a positive linear response to the increase in IBA concentration. Instead,...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cucumis sativus; Fecundation; Flowering; Viability pollen; Plant hormones.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-05362008000100006

Abscisic acid as a potential chemical thinner for peach
Provedor de dados: 86
Autores: Giovanaz,Marcos Antônio; Spagnol,Daniel; Bartz,Josiane; Pasa,Mateus da Silveira; Chaves,Fabio Clasen; Fachinello,José Carlos.
Abstract:The objective of this work was to evaluate the effect of abscisic acid, applied at different rates and different fruit developmental stages, on the thinning of 'Chiripá' peach. Abscisic acid (ABA) at 500 mg L-1 was applied at three stages of fruit development based on lignin deposition: stage 1, at 24 days after full bloom (DAFB); stage 2, at 40 DAFB; and stage 3, at 52 DAFB. Only ABA application at stage 2 - 40 DAFB - reduced fruit set and the number of fruit per plant. Three ABA concentrations (350, 500, and 750 mg L-1) were then applied at 40 DAFB. All rates increased fruit ethylene production and fruit abscission.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Abscission; Pit hardening; Plant growth regulators; Plant hormones; Stone fruit.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2015001000989

Dry matter partitioning differences between shoots and roots in two contrasting genotypes of orchids and their relationship with endogenous levels of auxins, cytokinins and abscisic acid
Provedor de dados: 93
Autores: PERES,LÁZARO E. P.; MAJEROWICZ,NIDIA; KERBAUY,GILBERTO B.
Epiphytic orchids have been considered an interesting model for plant development and may have unusual features related to the hormonal control of shoot and root growth. In the present experiment we have studied two genotypes of Catasetum fimbriatum Lindl. (Orchidaceae) with an inverse pattern of shoot and root dry matter accumulation. Whereas the CFC1 genotype directs 60% of dry matter towards the shoot system, this same amount is directed towards the root system in the CFC4 genotype. Differences in the endogenous content of cytokinins, IAA and ABA, as well as differences in IAA conjugation and oxidation in shoots and roots were observed in the two genotypes. These differences were correlated with their dry matter partitioning patterns. Thus, the genotype...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Epiphytes; Development; In vitro culture; Orchids; Plant hormones.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-31312001000200007

Nitric oxide in plants: a brief discussion on this multifunctional molecule
Provedor de dados: 63
Autores: Ferreira,Leonardo Cesar; Cataneo,Ana Catarina.
Several studies were carried out in order to improve the knowledge about the occurrence and activity of nitric oxide (NO) in plants. Thus, this review discusses some aspects related to NO in plants such as chemical properties, synthesis pathways, physiological effects, antioxidant action, signal transduction, interaction with plant hormones and gene expression. In the last years, many advances have been obtained regarding NO synthesis and its physiological effects in plants. However, the molecular mechanisms underlying its effects remain poorly understood. It is signalized that tight interplays among NO, Ca2+, cyclic ADP ribose (cADPR), and protein kinases need to be investigated in details. In addition, it has not yet been possible to identify a plant...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Pathogenesis; Plant hormones; Plant signal transduction; Reactive oxygen species.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162010000200017

Molecular battles between plant and pathogenic bacteria in the phyllosphere
Provedor de dados: 56
Autores: Baker,C.M.; Chitrakar,R.; Obulareddy,N.; Panchal,S.; Williams,P.; Melotto,M.
The phyllosphere, i.e., the aerial parts of the plant, provides one of the most important niches for microbial colonization. This niche supports the survival and, often, proliferation of microbes such as fungi and bacteria with diverse lifestyles including epiphytes, saprophytes, and pathogens. Although most microbes may complete the life cycle on the leaf surface, pathogens must enter the leaf and multiply aggressively in the leaf interior. Natural surface openings, such as stomata, are important entry sites for bacteria. Stomata are known for their vital role in water transpiration and gas exchange between the plant and the environment that is essential for plant growth. Recent studies have shown that stomata can also play an active role in limiting...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Guard cell; Plant innate immunity; Plant hormones; Bacterial pathogenesis; Food safety.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2010000800001

Effects of light and ethylene on endogenous hormones and development of Catasetum fimbriatum (Orchidaceae)
Provedor de dados: 61
Autores: Suzuki,Rogério M.; Kerbauy,Gilberto B.
This study attempted to clarify the effects of dark, light and ethylene on plant growth and endogenous levels of indole-3-acetic acid (IAA), cytokinins and abscisic acid in Catasetum fimbriatum. Dark-incubation fully inhibited root and pseudobulb formation as well as leaf growth, but favored shoot elongation. The results of continuous and active growth in dark-incubated shoots (stolons) were induced by strong apical meristem sink activity and by the significantly increased levels of cytokinins in shoots. In fact, shoot length, cytokinin and IAA levels in dark-incubated shoots were about twice as great as for those grown under light conditions. Moreover, the total cytokinin level in shoots of C. fimbriatum under light conditions without ethylene was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Auxin; Cytokinins; Etiolation; Plant growth; Plant hormones.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202006000300002