oalib
Search Results: 1 - 10 of 100 matches for " "
All listed articles are free for downloading (OA Articles)
Page 1 /100
Display every page Item
Auxin Control in the Formation of Adventitious Roots  [cached]
Tiberia I. POP,Doru PAMFIL,Catherine BELLINI
Notulae Botanicae Horti Agrobotanici Cluj-Napoca , 2011,
Abstract: Adventitious rooting is a complex process and a key step in the vegetative propagation of economically important woody, horticultural and agricultural species, playing an important role in the successful production of elite clones. The formation of adventitious roots is a quantitative genetic trait regulated by both environmental and endogenous factors. Among phytohormones, auxin plays an essential role in regulating roots development and it has been shown to be intimately involved in the process of adventitious rooting. Great progress has been made in elucidating the auxin-induced genes and auxin signaling pathway, especially in auxin response Aux/IAA and Auxin Response Factor gene families. Although some important aspects of adventitious and lateral rooting signaling have been revealed, the intricate signaling network remains poorly understood. This review summarizes some of the current knowledge on the physiological aspects of adventitious root formation and highlights the recent progress made in the identification of putative molecular players involved in the control of adventitious rooting. Despite much has been discovered regarding the effects and regulation of auxins on plant growth since the Darwin experiments, there is much that remains unknown.
Adventitious rooting of auxin-treated Lavandula dentata cuttings
Bona, Claudine Maria de;Biasi, Luiz Antonio;Lipski, Bernardo;Masetto, Magda Aparecida Maia;Deschamps, Cícero;
Ciência Rural , 2010, DOI: 10.1590/S0103-84782010005000081
Abstract: lavandula species may be propagated by seeds. however, plants will present expressive variation both in size and essential oil content. indole-3-butyric acid (iba) is a growth regulator which efficiently stimulates rooting and the objective of this research was to observe the influence of different iba concentrations on rooting of l. dentata cuttings. herbaceous cuttings with approximately 10cm in length and around 1/3 of leaf retention had their bases submerged into 0 (control), 500, 1.000, 2.000 or 3.000mg dm-3 of iba diluted in de-ionized water for 30 seconds and placed in polystyrene foam trays filled with commercial substrate and kept under intermittent mist system. averages of root number, length of the longest root, fresh and dry root weight, and percentage of rooted cuttings were evaluated after 60 days. there was no significant difference between treatments for the length of root, fresh and dry root weight. the percentage of rooted cuttings increased with iba concentrations. a quadratic regression was obtained to root number. the 2.000mg dm-3 dose increased the percentage of rooted cuttings and the mean root number per cutting. l. dentata cuttings are easy to root.
Proteomic Analysis through Adventitious Rooting of Pinus radiata Stem Cuttings with Different Rooting Capabilities  [PDF]
Carolina álvarez, Luis Valledor, Patricia Sáez, Manuel Sánchez-Olate, Darcy Ríos
American Journal of Plant Sciences (AJPS) , 2016, DOI: 10.4236/ajps.2016.714174
Abstract: In forest production systems, vegetative propagation of elite clones through adventitious rooting is a common practice. In Chile, adventitious rooting is the main methodology for vegetative reproduction of Pinus radiata. However, the capability of produce adventitious roots in gymnosperms decreases with aging. While it is true that some efforts have been made to identify markers or/and regulators of the aging process and adventitious rooting, molecular mechanisms that regulate both processes are scarcely known, especially at protein level. This research evaluated qualitative and quantitative changes in protein accumulation during the adventitious rooting process of P. radiata stem cuttings, with different rooting capabilities. Beside, an analysis of morpho-anatomical changes was performed in stem cuttings with high and low rooting capabilities, during the adventitious rooting process. It was observed that juvenile 1-year-old stem cuttings rooted in a 100%, while aged stem cuttings (3-year-old) presented only a 20% of rooting. According to the results of differential protein accumulation, univariate and multivariate analysis indicated that in total, 114 and 89 proteins were differentially accumulated in juvenile and aged cuttings, respectively. Also, identification of such proteins showed the presence of proteins related to cell wall organization and the presence of a protein related with proper distribution of auxin PIN transporter, both key in the new meristem formation process during adventitious rooting.
Carbon monoxide-induced adventitious rooting of hypo-cotyl cuttings from mung bean seedling
Carbon monoxide-induced adventitious rooting of hypocotyl cuttings from mung bean seedling

XU Ji,XUAN Wei,HUANG Benkai,ZHOU Yehua,LING Tengfang,XU Sheng,SHEN Wenbiao,
XU
,Ji,XUAN,Wei,HUANG,Benkai,ZHOU,Yehua,LING,Tengfang,XU,Sheng,SHEN,Wenbiao

科学通报(英文版) , 2006,
Abstract: In this paper, the regulatory role of ex-ogenous carbon monoxide (CO) during the genera-tion and development of adventitious roots in mung bean (Phaseolus radiatus L. cv. Mingguang) hypo-cotyl cuttings was surveyed. The results indicated that, like nitric oxide (NO), CO donor Hematin in-duced adventitious rooting in dose- and time-de- pendent manners. These responses were also prov- en by the addition of gaseous CO aqueous solution with different concentrations. Additionally, the above CO-mediated effect was differently reversed when CO scavenger hemoglobin (Hb), CO specific syn-thetic inhibitor ZnPPIX, the auxin transport inhibitor NPA and nitric oxide synthase (NOS) inhibitor L-NAME were added with Hematin, respectively. Furthermore, after being treated with CO for 36 h, NO fluorescence was significantly enhanced and mainly distributed in the zone of vascular bundles whereas the specific NO scavenger cPTIO significantly inhib-ited NO fluorescence induced by CO, indicating that CO induces adventitious rooting of hypocotyl cuttings from mung bean seedling probably mediated by NO/NOS pathway.
Carbon monoxide-induced adventitious rooting of hypocotyl cuttings from mung bean seedling
Ji Xu,Wei Xuan,Benkai Huang,Yehua Zhou,Tengfang Ling,Sheng Xu,Wenbiao Shen
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-0668-5
Abstract: In this paper, the regulatory role of exogenous carbon monoxide (CO) during the generation and development of adventitious roots in mung bean (Phaseolus radiatus L. cv. Mingguang) hypocotyl cuttings was surveyed. The results indicated that, like nitric oxide (NO), CO donor Hematin induced adventitious rooting in dose-and time-dependent manners. These responses were also proven by the addition of gaseous CO aqueous solution with different concentrations. Additionally, the above CO-mediated effect was differently reversed when CO scavenger hemoglobin (Hb), CO specific synthetic inhibitor ZnPPIX, the auxin transport inhibitor NPA and nitric oxide synthase (NOS) inhibitor L-NAME were added with Hematin, respectively. Furthermore, after being treated with CO for 36 h, NO fluorescence was significantly enhanced and mainly distributed in the zone of vascular bundles whereas the specific NO scavenger cPTIO significantly inhibited NO fluorescence induced by CO, indicating that CO induces adventitious rooting of hypocotyl cuttings from mung bean seedling probably mediated by NO/NOS pathway.
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.
Grewia optiva Fiber Reinforced Novel, Low Cost Polymer Composites  [cached]
A. S. Singha,Vijay Kumar Thakur
Journal of Chemistry , 2009, DOI: 10.1155/2009/642946
Abstract:
Role of the Arabidopsis PIN6 Auxin Transporter in Auxin Homeostasis and Auxin-Mediated Development  [PDF]
Christopher I. Cazzonelli, Marleen Vanstraelen, Sibu Simon, Kuide Yin, Ashley Carron-Arthur, Nazia Nisar, Gauri Tarle, Abby J. Cuttriss, Iain R. Searle, Eva Benkova, Ulrike Mathesius, Josette Masle, Ji?í Friml, Barry J. Pogson
PLOS ONE , 2013, DOI: 10.1371/journal.pone.0070069
Abstract: Plant-specific PIN-formed (PIN) efflux transporters for the plant hormone auxin are required for tissue-specific directional auxin transport and cellular auxin homeostasis. The Arabidopsis PIN protein family has been shown to play important roles in developmental processes such as embryogenesis, organogenesis, vascular tissue differentiation, root meristem patterning and tropic growth. Here we analyzed roles of the less characterised Arabidopsis PIN6 auxin transporter. PIN6 is auxin-inducible and is expressed during multiple auxin–regulated developmental processes. Loss of pin6 function interfered with primary root growth and lateral root development. Misexpression of PIN6 affected auxin transport and interfered with auxin homeostasis in other growth processes such as shoot apical dominance, lateral root primordia development, adventitious root formation, root hair outgrowth and root waving. These changes in auxin-regulated growth correlated with a reduction in total auxin transport as well as with an altered activity of DR5-GUS auxin response reporter. Overall, the data indicate that PIN6 regulates auxin homeostasis during plant development.
The Role of Mineral Nutrition on Adventitious Rooting in Woody Plant Species Papel da Nutri o Mineral na Forma o de Raízes Adventícias em Plantas Lenhosas  [cached]
Ana Catarina M. C. Mori da Cunha,Haroldo Nogueira de Paiva,Aloisio Xavier,Wagner Campos Otoni
Pesquisa Florestal Brasileira , 2010, DOI: 10.4336/2012.pfb.58.35
Abstract: In vegetative propagation by means of root cuttings, the nutritional status determines the amount of carbohydrates, endogenous auxin levels, among other metabolites, fundamental for the root initiation and to the speed that rhizogenic events progress. An especial attention should be given to the nutritional status of the donor-plants, in order to better assist the nutritional demands by the adventitious rooting process. Although mineral nutrition and adventitious rooting are intimately related, the subject is rather difficult to study, since the later involves multiple steps and few studies have aimed to elucidate the relationship between the mineral nutrition and rooting phases. In this review, the phases of the rhizogenesis are highlighted and the role minerals and nutritional requirements are discussed. It is noticed a lack of information regarding several processes involved on adventitious rooting. doi: 10.4336/2009.pfb.58.35 Na propaga o vegetativa por estaquia, o estado nutricional determinará a quantidade de carboidratos, auxinas, entre outros compostos metabólicos, fundamentais à inicia o radicial e à velocidade com que esta ocorre. Sendo assim, especial aten o deve ser dada às plantas matrizes, visando atender às exigências nutricionais requeridas no processo de rizogênese adventícia. Embora a nutri o mineral e o enraizamento adventício estejam intimamente relacionados, o assunto é complexo visto que a forma o de raízes em estacas inclui múltiplas fases e poucos estudos têm distinguido a rela o entre a nutri o mineral e as fases da rizogênese. Nesta revis o, as fases da rizogênese foram abordadas e os papéis e requerimentos nutricionais foram discutidos. Percebe-se que existe carência de informa es sobre vários processos envolvidos na forma o de raízes adventícias. doi: 10.4336/2009.pfb.58.35
Effects of Media Composition and Auxins on Adventitious Rooting of Bienertia sinuspersici Cuttings  [PDF]
Jennifer Anne Northmore, Marie Leung, Simon Dich Xung Chuong
Advances in Bioscience and Biotechnology (ABB) , 2015, DOI: 10.4236/abb.2015.610066
Abstract: An efficient in vitro method for rapid vegetative propagation of Bienertia sinuspersici, one of four terrestrial species of family Chenopodiaceae capable of performing C4 photosynthesis within a single cell, was developed. Cuttings of B. sinuspersici were used to examine the effects of Murashige and Skoog (MS) media strength and auxins on adventitious root formation. Half-strength MS medium was determined to be ideal for adventitious root formation in Bienertia cuttings. Although cuttings cultured in medium containing 5.0 mg/L α-naphthalene acetic acid (NAA) promoted the highest number of adventitious roots, cuttings cultured in medium supplemented with 1.0 mg/L indole-3-butyric acid (IBA) produced the longest adventitious roots and had the highest survival rate upon transplanting to soil. Histological analysis revealed variations in the root anatomy generated by the various auxins which may affect adventitious root formation and subsequent establishment of cuttings in soil. Overall, the established procedure provides a simple and cost-effective means for the rapid propagation of the single-cell C4 species B. sinuspersici.
Page 1 /100
Display every page Item


Home
Copyright © 2008-2017 Open Access Library. All rights reserved.