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João Manetti-Filho

Bio: João Manetti-Filho is an academic researcher. The author has contributed to research in topics: Somatic embryogenesis & Fructose. The author has an hindex of 1, co-authored 1 publications receiving 156 citations.

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TL;DR: At concentrations between 30–60 μM, AgNO3 improved embryo yield for the genotypes evaluated, while higher doses negatively affected the regenerative capacity, and the substitution of maltose, glucose or fructose for sucrose produced different responses depending on the genotype.
Abstract: The response of five Coffea canephora Pierre genotypes with regard to somatic embryogenesis was tested on media containing silver nitrate (AgNO3) and different carbohydrates (sucrose, fructose, maltose and glucose). The presence of AgNO3 caused only small modifications to the ionic equilibrium of the media. At concentrations between 30–60 μM, AgNO3 improved embryo yield for the genotypes evaluated, while higher doses negatively affected the regenerative capacity. The substitution of maltose, glucose or fructose for sucrose produced different responses depending on the genotype. Fructose significantly increased somatic embryo production in genotypes N91 and N128, while maltose was highly effective for N75. In addition, more synchronous embryo development was observed in genotype N91 when glucose was used instead of sucrose.

169 citations


Cited by
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Journal ArticleDOI
TL;DR: This review compiles published reports of silver nitrate-mediated in vitro and in vivo studies and focuses on fundamental and applied aspects of plant growth modulation under the influence ofsilver nitrate.

201 citations

Journal ArticleDOI
TL;DR: The present communication attempts to overview the progress in tissue culture, genetic transformation and biotechnological applications in the last decade and future implications.
Abstract: Trees are an integral part of human life, and a vital component of biodiversity. Forest trees in particular are renewable sources of food, fodder, fuel wood, timber and other valuable non-timber products. Due to the rapid growth of population and the human desire to progress, there has been a tremendous reduction in forest cover from the earth’s surface. To maintain and sustain forest vegetation, conventional approaches have been exploited in the past for propagation and improvement. However, such efforts are confronted with several inherent bottlenecks. Biotechnological interventions for in vitro regeneration, mass micropropagation and gene transfer methods in forest tree species have been practised with success, especially in the last decade. Against the background of the limitations of long juvenile phases and life span, development of plant regeneration protocols and genetic engineering of tree species are gaining importance. Genetic engineering assumes additional significance, because of the possibility of introducing a desired gene in a single step for precision breeding of forest trees. There are no comprehensive and detailed reviews available combining research developments with major emphases on tissue culture and basic genetic transformation in tree species. The present communication attempts to overview the progress in tissue culture, genetic transformation and biotechnological applications in the last decade and future implications.

178 citations

Journal ArticleDOI
TL;DR: The present article reviews the past and current findings on carbon sources and their sustainable utilization for in vitro plant tissue culture to achieve better growth rate and development.
Abstract: In vitro plant cells, tissues and organ cultures are not fully autotrophic establishing a need for carbohydrates in culture media to maintain the osmotic potential, as well as to serve as energy and carbon sources for developmental processes including shoot proliferation, root induction as well as emission, embryogenesis and organogenesis, which are highly energy demanding developmental processes in plant biology. A variety of carbon sources (both reducing and non-reducing) are used in culture media depending upon genotypes and specific stages of growth. However, sucrose is most widely used as a major transport-sugar in the phloem sap of many plants. In micropropagation systems, morphogenetic potential of plant tissues can greatly be manipulated by varying type and concentration of carbon sources. The present article reviews the past and current findings on carbon sources and their sustainable utilization for in vitro plant tissue culture to achieve better growth rate and development.

169 citations

Journal ArticleDOI
TL;DR: Molar concentrations should be used to carbohydrate concentrations reference because it isolates the osmotic variable influence that acts concomitantly with the nutritional variable.

116 citations

Journal ArticleDOI
TL;DR: A test of 68 new initiations tracked closely for 4 months demonstrated that at least 80% of the cultures lost did not grow after transfer to the multiplication media, suggesting that many new Initiations abort during the initiation process.
Abstract: Loblolly pine (Pinus taeda L.) culture initiation was improved by the addition of abscisic acid (ABA) (3.7 µM), silver nitrate (20 µM), and guanosine 3′,5′-cyclic monophosphate, 8-bromo-, sodium salt (10 µM) to the medium and by raising cytokinin levels in the presence of 50 mg/l activated carbon (AC). Basal medium contained modified 1/2-P6 salts, 50 mg/l AC, Cu and Zn added to compensate for adsorption by AC, 1.5% maltose, 2% myo-inositol, 500 mg/l casamino acids, 450 mg/l glutamine, 2 mg/l α-naphthaleneacetic acid (NAA), 0.55 mg/l 6-benzylaminopurine (BA), 0.53 mg/l kinetin, and 2 g/l Gelrite. Across 32 open-pollinated families initiation ranged from 0 to 53.4%, with an average of 17.9%. Further optimization of cytokinins to 0.63 mg/l BA and 0.61 mg/l kinetin along with the removal of ABA maintained initiation at 18.2% across 19 families. Survival of 2001 new initiations was tracked for 4–6 months. Survival averaged 28.8%. A test of 68 new initiations tracked closely for 4 months demonstrated that at least 80% of the cultures lost did not grow after transfer to the multiplication media, suggesting that many new initiations abort during the initiation process.

71 citations