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Showing 1 to 20 of 31 for “"cytokinins"”.
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The Synthesis and Chemistry of Cytokinins
Made available in DSpace on 2014-12-10T23:01:35Z (GMT). No. of bitstreams: 1 7317523.pdf: 3710450 bytes, checksum: bc2b692b3bf2e41a3f58d487b5b6ee51 (MD5) Previous issue date: 1973
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The Synthesis of Cytokinins and Cytokinin Analogs
Made available in DSpace on 2014-12-10T23:01:33Z (GMT). No. of bitstreams: 1 7317363.pdf: 2816632 bytes, checksum: dee8c38eaf8f625452f0d796c0c9096d (MD5) Previous issue date: 1972
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Identification of soybean, Glycine max (L.) Merr., cytokinins
… did not yield conclusive identification of the cytokinins. Based on bioassay, the biological estimates of cytokinin-like substances present in the extracts were below the detection limit of the GC-MS. Obtaining sufficiently large samples of soybean fruits at the proper stage of physiological …
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Floral initiation in <i>Rudbeckia hirta</i>: limited inductive photoperiod, polyamines and cytokinins
… that reported for cytokinin behavior. Exogenous cytokinins have been used to stimulate floral initiation in several species but Rudbeckia hirta did not respond to benzyladenine (BA) applied at the onset of LD. Floral initiation has been found to begin after six to eight LD and, in most species, …
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Cytokinins tolerance and in vitro selection for dwarfism in apple (Malus x domestica Borkh.)
A reliable in vitro shoot regeneration system was developed for leaf segments of six apple (Malus Xdomestica Borkh) cultivars ('Wijcik', 'McIntosh', 'Macspur', 'Regal Gala' and 'M 26') grown in vitro using modified Murashige and Skoog (MS) medium supplemented with N-phenyl-N$\sp\prime$ …
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How the fas locus contributes to Rhodococcus fascians cytokinin production: an in-depth molecular and biochemical analysis
… plasmid of R. fascians D188, the role for cytokinins in the pathology had been anticipated for a long time. Subsequent studies identified and characterized the fas operon as a key genetic determinant of virulence and likely cytokinin biosynthesis. Nevertheless, many aspects concerning …
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Development of in vitro regeneration and gene transfer systems for conifer species
… induced. The influence of genotype and various cytokinins (BA, BPA, and TDZ) in combination with 2,4-D were investigated. Among the cytokinins tested, 20 $\mu$M BPA with 5 $\mu$M 2,4-D produced the highest frequency of shoot organogenesis from three genotypes while, 10 $\mu$M TDZ with 5 $\mu$M …
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Cytokinin interconversion by StCKP1 controls potato tuber dormancy
… Union due to their impact upon the environment. Cytokinins, a group of plant growth regulators, are known to play a central role in tuber bud sprouting and tuber initiation from stolon tips in Solanum tuberosum L. although it is unclear when and how cytokinins act to regulate dormancy. The …
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The Use of Plant Growth Regulators to Improve the Traffic Tolerance and Repair of Overseeded Bermudagrass
… Exogenous applications of synthetic cytokinins or cytokinin-enhancing plant growth regulators (PGRs), such as trinexapac-ethyl, may improve the traffic tolerance of "Patriot" and "Tifsport" hybrid berudagrasses (Cynodon dactylon var. dactylon x Cynodon transvaalensis). This study was …
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Mechanisms of cytokinin action
… Chinese cabbage leaf tissue. 3. The synthetic cytokinins kinetin and 6-benzylaminopurine bind reversibly to purifies Chinese cabbage leaf ribosomes. At 4°C, 0.8 molecules of kinetin and 1.08 molecules of 6BA are bound per ribosome. Adenine and adenine derivatives that are inactive as cytokinins …
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Physiological aspects associated with mixed-nitrogen-induced increases in growth and tillering of wheat
… experiments focused on the roles of: (1) cytokinins; (2) N use; (3) photoassimilate production and partitioning; and, (4) the accumulation and partitioning of other mineral ions in the enhanced growth and tillering of spring wheat induced by mixed N nutrition. Another experiment sought to …
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Effects of commercial kelp extract and plant growth regulators on growth of Gracilaria gracilis in culture
… amounts of plant growth regulators (auxins and cytokinins). The aim of this study was therefore to investigate the effects of this commercial seaweed concentrate (Kelpak®) on the growth of Gracilaria gracilis (Stackhouse) Steentoft, Irvine et Farnham, with a view to the potential in mariculture, …
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The regulation of division of higher plant cells
… reliable and less time consuming. The endogenous cytokinins were studied during the first cell division. The individual levels were found to fluctuate with total cytokinin-like activity reaching a maxima -coincident with mitosis and/or cytokinesis. Z was the major cytokinin detected. This …
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The Role of lAA in the Regulation of Plant Cell Growth
… level must be achieved before mitosis occurs. Cytokinins are classically known as cell division factors. Investigations of cytokinin-like activity in asynchronous batch cultures revealed that activity increased prior to the first highly synchronous division. Furthermore, in cultures where …
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ΜΕΛΕΤΗ ΤΗΣ ΒΙΟΣΥΝΘΕΣΗΣ ΤΩΝ ΠΟΛΥΑΜΙΝΩΝ ΣΤΑ ΒΛΑΣΤΗΜΕΝΑ ΣΠΕΡΜΑΤΑ ΚΡΙΘΑΡΙΟΥ
… THEPRESENCE OF PLANT HORMONES (GIBBERELIC ACID, CYTOKININS) IN THE GROWTH MEDIUM,ODC FROM CHROMATIN OF GERMINATED BARLEY SEEDS HAS BEEN PURIFIED TO HOMOGENEITY. THE MOLECULAR WEIGHT OF CHROMATIN-BOUND ODC IS 55,000 WITH ISOELECTRIC POINT 5.2 AND KM TO L-ORNITHINE 0.36 MM. CYTOSOLIC ODC HAS BEEN …
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Activity Enhancement and the Mechanism of Glyphosate Action in Common Cocklebur
… leaves, leaves three and four. To determine if cytokinins increased transpiration thereby increasing the uptake and altering the movement of glyphosate, leaf diffusive resistance was measured. At 24, 36 and 48 h after cytokinin application, there were no diffusive resistance differences in any …
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REGULATING CYTOKININ METABOLISM DURING INFLORESCENCE MERISTEM DEVELOPMENT TO PROMOTE HIGHER RICE PRODUCTIVITY THROUGH CHANGES ON PLANT ARCHITECTURE
… plant growth and development. In plants, cytokinins are degraded by cytokinin oxidase/dehydrogenase (CKX) enzymes, which catalyze their irreversible oxidative degradation, thereby reducing their levels. In rice, a staple crop feeding billions of people worldwide, previous studies have …
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Callus Development and Organogenesis in Cultured Explants of Cowpea (Vigna unguiculata (L.) Walp
… Murashige and Skoog (MS) medium, auxins and cytokinins resulted in the formation of callus and rhizogenesis. Calli that were formed were separated into six classes based on color and texture. Yellowish friable callus, yellowish compact, soft yellowish callus and green and white were composed …
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ΠΑΡΑΓΟΝΤΕΣ ΠΟΥ ΕΠΗΡΕΑΖΟΥΝ ΤΗ ΒΛΑΣΤΟΓΕΝΕΣΗ ΚΑΙ ΡΙΖΟΓΕΝΕΣΗ IN VITRO ΤΟΥ ΥΠΟΚΕΙΜΕΝΟΥ ΡΟΔΑΚΙΝΙΑΣ GF-677 ΚΑΙ ΤΗΣ ΠΕΤΟΥΝΙΑΣ (PETUNIA HYBRIDA)
… A GREENHOUSE, DURING WINTER. FROM THE TESTED CYTOKININS BENZYLADENINE (BΑ) GAVE A GREATEST NUMBER OF PLANTLETS IN COMPARISON TO 2IP AT 1 MG/1. HOWEVER, 2IP GAVE LONGER PLANTLETS. THE PLANTLETS OF GF-677 START TO ROOT 12 DAYS AFTER TRANSFERING TO THE ROOTING MEDIUM CONTAINING IBA OR A-NAA. THE …
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Phytohormones and the Culture of Agaricus bisporus (Lange) Pilat
… of phytohormones (auxins, gibberellins and cytokinins). The fluctuation in levels of phytohormones in compost and casing soil were related to fluctuations in the population of bacteria and fungi. Phytohormones play a role in regulating the interaction between A. bisporus and other …
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