Wyniki wyszukiwania - AGRO

1

Role of polyamines in cytokinin-regulated physiological processes

100%

Legocka J., Zarnowska A.

Polish Journal of Natural Sciences. Supplement

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2003

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tom 01

2

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The effect of cytokinins on flax seed germination at low temperature

75%

Buklaha S., Niedzwiedz-Siegien I.

Acta Societatis Botanicorum Poloniae

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2006

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tom 75

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nr 4

281-284

Germination of flax seeds (Linum usitatissimum L., cv. Szafir) at 5oC was enhanced by continuous white light, gibberellin A3 (GA3), kinetin and benzylaminopurine. GA3 and kinetin at physiological concentrations (10-8-10-6 M) improved significantly germination in darkness. Stimulatory effect of benzylaminopurine was visible only in the light. Almost no effect of zeatin and isopentenyladenine (2iP) on germination was observed. Possible causes of this differences were suggested.

3

Micropropagation of Harpagophytum procumbens [Burch.] DC. ex Meisn.: the effect of cytokinins on shoot multiplication

75%

Grabkowska R., Wysokinska H.

Herba Polonica

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2009

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tom 55

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nr 3

244-250

The procedure of in vitro propagation of Harpagophytum procumbens using shoot tips was developed. Shoot tips were cultured on Schenk and Hildebrandt (SH) agar medium supplemented with 0.57 µM indole-3-acetic acid (IAA) in combination with various cytokinins: 6-benzylaminopurine (BAP), thidiazurone (TDZ), kinetin or zeatin at four concentrations (2, 4, 6 or 8 µM). The best shoot multiplication rate (11.2 shoots/explant for 5 weeks) was achieved in the presence of 6 µM TDZ. The shoots were small and their elongation on SH medium supplemented with gibberellic acid (GA3 ) was necessary. Shoots of H. procumbens were rooted on full-strength or half-strength Murashige and Skoog (MS) agar medium either with or without auxin. Plantlets were transferred into pots and maintained in the greenhouse. After 1 month, the overall survival of plants was 83% but it decreased to 27% after 6 months.

4

The effects of methyl jasmonate and benzyladenine of epiphyllous bud formation in Bryophyllum daigremontianum

75%

Saniewski M.

Bulletin of the Polish Academy of Sciences. Biological Sciences

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1988

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tom 36

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nr 1-3

5

The content of free endogenous cytokinins in differently aged seeds of Vicia faba

75%

Murin G., Vozar I., Vizarova G.

Acta Physiologiae Plantarum

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1994

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tom 16

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nr 1

6

Antimitotic properties of plant hormone-derived inhibitors of cyclin-dependent kinases in plant and animal cells

75%

Strnad M., Hajduch M., Havlicek L., Binarova P., Bogre L.

Cellular and Molecular Biology Letters

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1998

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tom 03

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nr 3

7

Effect of cytokinins on in vitro morphogenesis and ploidy of pepper Capsicum annuum L.

75%

Tomaszewska-Sowa M., Drozdowska L., Szota M.

Electronic Journal of Polish Agricultural Universities. Series Agronomy

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2002

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tom 05

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nr 1

The study-compared effect of cytokinins on morphogenesis and ploidy of plants regenerated in vitro from explants of Stanola F1, ATZ and ATM pepper seeds. The aim of defining the morphogenetic potential of the studied genotypes, half-seed explants consisting the proximal part of the hypocotyl and radicle were put onto the MS medium containing BAP (5.0 mg.dm-3), 2iP (2.5 mg.dm-3), ZEA (2.5 mg.dm-3), TDZ (1.5 mg.dm-3), while MS medium without cytokinins constituted the control. After the initiation period, explants were transferred onto the medium without cytokinins. The effect of the growth regulators to the morphogenetic response of explants was estimated based on the number of explants on which adventitious buds and shoots were developing. The cytokinins applied did not show a significant effect on the development of adventitious buds on pepper explants.

8

Somatic embryogenesis of Cyclamen persicum Mill.in seedlings culture

75%

Bach A., Malik M.

Acta Biologica Cracoviensia. Series Botanica et Zoologia. Supplement

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1997

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tom 39

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nr 1

9

Effect of cytokinins on the changes of the polyamines level in the culture of protonema of Ceratodon purpureus

75%

Zarnowska A., Legocka J.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 2

10

Effect of cytokinins on flower differentiation in cultured plantlets of Pharbitis nil Chois

75%

Galoch E., Burkacka-Laukajtys E., Kopcewicz J.

Acta Physiologiae Plantarum

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1996

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tom 18

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nr 3

11

Levels of soluble carbohydrates, ABA and cytokinins in the initial material and the regeneration in vitro of Fritillaria imperials L.

75%

Witomska M.

Annals of Warsaw Agricultural University. Horticulture

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2001

|

tom 22

12

Effects of cytokinins and amino acids on multiplication of Pelargonium cultivars

75%

Wojtania A., Gabryszewska E.

Acta Societatis Botanicorum Poloniae

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2001

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tom 70

|

nr 3

13

Cell suspension cultures of Lemna minor L.

75%

Stefaniak B., Wozny A., Budna I.

Acta Biologica Cracoviensia. Series Botanica. Supplement

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1999

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tom 41

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nr 1

14

An improvement of cucumber cotyledon greening bioassay for cytokinins

75%

Yu X., Li G., Xu D., Dong X., Qi X., Deng Y.

Acta Physiologiae Plantarum

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2006

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tom 28

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nr 1

The cucumber cotyledon greening bioassay for cytokinins was modified by using 95 % acetone -ethanol in stead of 80 % acetone as ex traction solvent. The cotyledons were ex tracted directly with a 2:1 (v/v) ac e tone-ethanol solution in dark for 24 hours, omitting the homogenization and centrifugation operations of the previous bioassay. The modified bioassay is more convenient and especially use ful in screening cytokinin-active substance from a large number of samples.

15

Effect of cytokinins and growth retardants on regeneration of adventitious shoots on tulip stem explants in vitro

75%

Podwyszynska M., Skrzypczak C., Fatel K., Gabryszewska E., Marasek A.

Acta Physiologiae Plantarum

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1997

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tom 19

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nr 2

16

Application of environment friendly branch promoting substances to advance sweet cherry tree canopy development in the orchard

75%

Jacyna T., Puchala A.

Journal of Fruit and Ornamental Plant Research

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2004

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tom 12

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nr Spec.ed.

17

A comparative study of different cytokinins on the formation of Rhododendron forrestii Balf.f.ex Diels. axillary shoots in vitro

75%

Kamenicka A., Valka J., Vizarova G.

Acta Physiologiae Plantarum

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1998

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tom 20

|

nr 2

The effect of different concentrations and activities of cytokinins on the morphogenesis of regenerated Rhododendron forrestii Balf. f. ex Diels. shoots taken from nodal segments were tested. We evaluated zeatin, zeatin riboside, izopentyladenine, izopentyladenine riboside, kinetin, kinetin riboside, benzylaminopurine, benzylaminopurine riboside. The experimental results were evaluated by mathematical methods and regression analysis describing the effect of isoprenic and aromatic type of cytokinins. On the basis of this modelling, maximum axillary shoot production was attained with medium supplemented with 2.0 mg·l⁻¹ izopentyladenine riboside, 2.0 mg·l⁻¹ benzylaminopurine and 20 g·l⁻¹ sucrose. Minimal axillary shoots were produced with kinetin and kinetin riboside.

18

Optimization of carbon-nitrogen ratio for production of gibberellic acid by Pseudomonas sp.

75%

Basiacik K. S., Aksoz N.

Polish Journal of Microbiology

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2004

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tom 53

|

nr 2

In this study, favorable carbon-nitrogen ratio for high yields of gibberellic acid (GA₃) production from Pseudomonas sp. was investigated. First of all, optimum carbon (glucose, maltose, sucrose, fructose, lactose) and nitrogen (KNO₃, NH₄C1, NaNO₃, urea, glycine) sources among the others were chosen. The highest yield of GA₃ productivity was found in growth medium supplemented with fructose (168.5 mg/L). NaNO₃ was found as a suitable nitrogen source (141 mg/L). Then, in order to determine the optimum carbon-nitrogen ratio, different concentrations of carbon (from 50 mM to 150 mM) and nitrogen (from 17 mM to 47 mM) sources were added in culture media. As a result, optimum carbon-nitrogen ratio for GA₃ production from Pseudomonas sp. was found to be 100:17 mM.

19

In vitro regeneration induced in leaf explants of Citrus limon L. Burm cv. ‘Primofiore’

63%

Kasprzyk-Pawelec A., Pietrusiewicz J., Szczuka E.

Acta Scientiarum Polonorum. Hortorum Cultus

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2015

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tom 14

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nr 4

In vitro organogenesis was studied using Citrus limon L. Burm cv. ‘Primofiore’ leaf explants. The purpose of the present study was to optimize conditions for callogenesis and organogenesis of C. limon. Explants of C. limon were cultured on 16 different media supplemented with various combinations of plant growth regulators, both auxins and cytokinins, such as 6-benzylaminopurine (BAP), naphthalene acetic acid (NAA), 2,4-dichlorophenoxyacetic acid (2,4-D), and kinetin. The best shoot induction was obtained when the leaf explants were cultured on Murashige & Tucker media supplemented with 3.5 mg·L-1 BAP. Histological investigation revealed most likely the initial phase of development of leaf explants during in vitro regeneration of C. limon. t

20

Dormancy release and germination in recalcitrant Aesculus hippocastanum seeds

63%

Obroucheva N. V., Lityagina S. V.

Dendrobiology

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2007

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tom 57

27-33

The investigation of dormancy release in Aesculus hippocastanum seeds was aimed at estimating the proportion of coat-imposed to embryo dormancy, and studying the growth initiation providing embryo dormancy release. During winter, horse chestnut seeds exhibited 16–17 week-lasting deep dormancy, which predominantly was determined by coat-imposed dormancy. Embryo dormancy lasted for 11–12 weeks of wet cold stratification. Embryo dormancy was weak, even the embryo axes excised from deeply dormant seeds were capable of extending to the size exceeding the axis length in intact seeds at radicle protrusion. Embryo dormancy release manifested itself in gradually increasing growth capacity of both embryo axes and cotyledonary petioles. The growth initiation in horse chestnut seeds occurs only by cell elongation. During growth initiation, a more rapid fresh weight gain was observed in comparison with length increment, thus indicating that accumulation of osmotically active substances and active water uptake by embryo axis cells were ahead of their increasing longitudinal cell wall extensibility. Cell wall loosening appeared to be directly related to embryo dormancy release. The hormonal regulation of embryo dormancy release in horse chestnut seeds is discussed.

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