scholarly journals Badania nad wpływem czynników chemicznych i fizycznych na zwiększenie współczynnika rozmnażania wegetatywnego bulw frezji. Cz. I. Pobudzanie do rozwoju pąków pachwinowych bulw [The effect of chemical and physical factors on increasing of the coefficient of vegetative propagation of freesia corms. Part I. Stimulation of the axillary buds of corms to development]

2015 ◽  
Vol 22 (2) ◽  
pp. 303-342
Author(s):  
K. Kukułczanka
Keyword(s):  
Vegetative Propagation ◽  
Axillary Buds ◽  
Physical Factors ◽  
Stimulation Of

scholarly journals Physical factors in the stimulation of calonic peristalsis

Gut ◽  
1970 ◽  
Vol 11 (1) ◽  
pp. 41-46 ◽  
Author(s):  
J. D. Hardcastle ◽  
C. V. Mann
Keyword(s):  
Physical Factors ◽  
Stimulation Of

Rapid micropropagation of Calabrian pine from primary and secondary buds on shoot explants

1986 ◽  
Vol 16 (3) ◽  
pp. 637-641 ◽  
Author(s):  
Anwar A. Abdullah ◽  
John Grace ◽  
Michael M. Yeoman
Keyword(s):  
Vegetative Propagation ◽  
Activated Charcoal ◽  
Axillary Buds ◽  
Surgical Removal ◽  
Axillary Shoot ◽  
Free Medium ◽  
Cytokinin Level ◽  
Apical Buds ◽  
Shoot Production ◽  
Calabrian Pine

Axillary shoot production was achieved in 6 weeks using excised shoot explants of Pinusbrutia Ten. on a modified Schenk and Hildebrandt medium containing cytokinin. Primary shoots arose from existing axillary buds and secondary buds arose from bases of the primary shoots. Their production could be increased by regulating the cytokinin level and by surgical removal of apical buds from the cultured explants. However, the best performance was achieved with a low level of 6-benzylaminopurine (3 × 10−6 M) or a mixture of 6-benzylaminopurine and kinetin (10−6 M of each). Subsequent transfer to a cytokinin-free medium resulted on average in the production of 43 shoots per cultured explant and up to 67 shoots per clone within 12 weeks. When the primary shoots, which had already produced one crop of secondary shoots, were maintained under conditions favourable for shoot production, a doubling in number was obtained within 4–6 weeks. To encourage further elongation, newly formed shoots were incubated for 2 weeks on a cytokinin-free medium to which 1% activated charcoal was added. The time taken with this method was much shorter than with other published methods and is, therefore, likely to be important for the vegetative propagation and multiplication of selected seedlings of this species.

CONTRIBUTIONS TO THE FLORA OF ISRAEL. VI. STIPAGROSTIS DRARII AND AMBROSIA CONFERTIFLORA AND TENUIFOLIA, NEW RECORDS FROM ISRAEL

1994 ◽  
Vol 42 (1) ◽  
pp. 59-61 ◽  
Author(s):  
Avinoam Danin
Keyword(s):  
Vegetative Propagation ◽  
New Records ◽  
Sandy Soils ◽  
Soil Surface ◽  
Axillary Buds ◽  
Noxious Weeds ◽  
Colonizing Species ◽  
Desert Areas ◽  
Typical Component ◽  
First Time

Stipagrostis drarii, found recently in sandy soils of the Arava Valley, is typical component of sandy soils in extreme desert areas. It is adapted to sand mobility by having the ability to overcome up to 50 cm of sand-cover by producing new shoots from the axillary buds of the leafy culm and adventive roots from nodes close to the new soil surface. Two species of Ambrosia which seem to be relatively new introductions to the flora of Israel are recorded here for the first time. It is not clear if these colonizing species will become established. However, judging from their way of dispersal by many small diaspores and efficient vegetative propagation they are potentially noxious weeds.

Inducing Orthotropic Shoots in Coffee with the Morphactin Chlorflurenolmethylester

1982 ◽  
Vol 18 (1) ◽  
pp. 29-35 ◽  
Author(s):  
W. P. C. Stemmer ◽  
J. C. J. Van Adrichem ◽  
F. A. Roorda
Keyword(s):  
Vegetative Propagation ◽  
Auxin Transport ◽  
Axillary Buds ◽  
Inexpensive Method ◽  
Resistant Cultivars ◽  
Disease Resistant ◽  
Coffee Plants

SUMMARYThe auxin-transport-inhibiting morphactin chlorflurenolmethylester (CFM; Methyl 2-chloro-9-hydroxyfluorene-9-carboxylate) breaks the dormancy of axillary buds in young coffee plants and produces orthotropic shoots. A concentration of CFM as low as 50 mg/litre induced an average of 24 orthotropic shoots per 6-month-old seedling. This approach could provide a fast and inexpensive method of vegetative propagation for raising disease-resistant cultivars if adult clones respond similarly to the seedlings used here and the treatment does not adversely affect the propagation of induced shoots.

scholarly journals GA3 Application Alters Flowering Phenology of `Hass' Avocado

1998 ◽  
Vol 123 (5) ◽  
pp. 791-797 ◽  
Author(s):  
Samuel Salazar-García ◽  
Carol J. Lovatt
Keyword(s):  
Vegetative Growth ◽  
Flowering Phenology ◽  
Persea Americana ◽  
Field Conditions ◽  
Axillary Buds ◽  
Vegetative Shoot ◽  
Full Bloom ◽  
Hass Avocado ◽  
Precocious Development ◽  
Stimulation Of

The objectives of the present research were to quantify 1) the contribution that vegetative shoots produced in the summer vs. fall and indeterminate vs. determinate inflorescences make to yield and 2) the effects of GA3 on flowering expression and inflorescence phenology of summer and fall shoots of `Hass' avocado (Persea americana Mill.) under field conditions. Anthesis started earlier on fall than summer shoots of 10-year-old `Hass' avocado trees; however, no difference in the date of full bloom was observed. Indeterminate inflorescences that underwent early anthesis set more fruit than those with delayed anthesis, conversely, determinate inflorescences with delayed anthesis set more fruit. Indeterminate inflorescences comprised 90% of total inflorescences and contributed 73% of total fruit yield, but individual determinate inflorescences were at least three times more productive than the indeterminate ones. Summer and fall shoots were sprayed with 0, 50, 100, or 1000 mg·L-1 GA3 in November, December or January. GA3 stimulated apical growth of all shoots. If secondary axes of an inflorescence bud were differentiated at the time of GA3 application, the inflorescence developed in advance of inflorescences on branches not treated with GA3. In addition, GA3 caused precocious development of the vegetative shoot of indeterminate inflorescences relative to the flowers in the same inflorescence and relative to the vegetative shoot of indeterminate inflorescences from untreated branches. Stimulation of vegetative growth at the inflorescence apex by GA3 inhibited growth of axillary buds. GA3 at 50 mg·L-1 had no effect on the number of determinate or indeterminate inflorescences produced by either summer or fall shoots. Higher concentrations of GA3 increased the number of vegetative shoots and inactive buds produced by both shoot types.

The origin and anatomy of rhizophores in Vernonia herbacea and V. platensis (Asteraceae) from the Brazilian Cerrado

2005 ◽  
Vol 53 (3) ◽  
pp. 273 ◽  
Author(s):  
Adriana Hissae Hayashi ◽  
Beatriz Appezzato-da-Glória
Keyword(s):  
Root System ◽  
Vegetative Propagation ◽  
Primary Root ◽  
Cotyledonary Node ◽  
Axillary Buds ◽  
Brazilian Cerrado ◽  
Natural Conditions ◽  
Environmental Disturbances

The aim of this work is to study the origin and anatomy of rhizophores in two Asteraceae species from the Brazilian Cerrado: Vernonia herbacea (Vell.) Rusby and V. platensis (Spreng.) Less. In both species, axillary buds from the cotyledonary node give rise to the first rhizophores. As rhizophores develop, these organs branch to form new rhizophores from their axillary buds that constitute a sympodial system of underground branches. Nodes, internodes and axillary buds, protected by cataphylls, are evident in these underground organs. The primary root degenerates and all the root system arises adventitiously from the rhizophores. Under natural conditions, the axillary buds give rise to new rhizophores, but when exposed to the light, these buds develop into aerial stems. When rhizophores are fragmented, each of these structures, which accumulate fructans, are important organs for vegetative propagation mainly in areas subjected to environmental disturbances, such as the Cerrado, where fire and drought frequently occur.

Effects of 5-5'-Diphenyl-2-thiohydantoin (DPTH) and Thyroxine on the Ultrastructure and Chemical Composition of Rat Liver

1971 ◽  
Vol 29 ◽  
pp. 570-571
Author(s):  
E. A. Elfont ◽  
R. B. Tobin ◽  
D. G. Colton ◽  
M. A. Mehlman
Keyword(s):  
Chemical Composition ◽  
Rat Liver ◽  
Future Study ◽  
Mode Of Action ◽  
Liver Mitochondria ◽  
Rat Liver Mitochondria ◽  
Effective Inhibitor ◽  
Biochemical Effects ◽  
Glycerophosphate Dehydrogenase ◽  
Stimulation Of

Summary5,-5'-diphenyl-2-thiohydantoin (DPTH) is an effective inhibitor of thyroxine (T4) stimulation of α-glycerophosphate dehydrogenase in rat liver mitochondria. Because this finding indicated a possible tool for future study of the mode of action of thyroxine, the ultrastructural and biochemical effects of DPTH and/or thyroxine on rat liver mere investigated.Rats were fed either standard or DPTH (0.06%) diet for 30 days before T4 (250 ug/kg/day) was injected. Injection of T4 occurred daily for 10 days prior to sacrifice. After removal of the liver and kidneys, part of the tissue was frozen at -50°C for later biocheailcal analyses, while the rest was prefixed in buffered 3.5X glutaraldehyde (390 mOs) and post-fixed in buffered 1Z OsO4 (376 mOs). Tissues were embedded in Araldlte 502 and the sections examined in a Zeiss EM 9S.Hepatocytes from hyperthyroid rats (Fig. 2) demonstrated enlarged and more numerous mitochondria than those of controls (Fig. 1). Glycogen was almost totally absent from the cytoplasm of the T4-treated rats.

Gap junctions in the prothoracic glands of the tobacco hornworm, Manduca sexta

1992 ◽  
Vol 50 (1) ◽  
pp. 706-707
Author(s):  
Ji-da Dai ◽  
M. Joseph Costello ◽  
Lawrence I. Gilbert
Keyword(s):  
Gap Junctions ◽  
Small Molecules ◽  
Manduca Sexta ◽  
Freeze Fracture ◽  
Cell Communication ◽  
Cellular Level ◽  
Thin Sections ◽  
Prothoracic Glands ◽  
Polyhydroxylated Steroids ◽  
Stimulation Of

Insect molting and metamorphosis are elicited by a class of polyhydroxylated steroids, ecdysteroids, that originate in the prothoracic glands (PGs). Prothoracicotropic hormone stimulation of steroidogenesis by the PGs at the cellular level involves both calcium and cAMP. Cell-to-cell communication mediated by gap junctions may play a key role in regulating signal transduction by controlling the transmission of small molecules and ions between adjacent cells. This is the first report of gap junctions in the PGs, the evidence obtained by means of SEM, thin sections and freeze-fracture replicas.

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