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  • Blackwell Publishing Ltd  (16)
  • Wiley-Blackwell  (9)
  • 1980-1984  (23)
  • 1910-1914  (1)
  • 1850-1859  (1)
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  • 1
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: On the mechanical properties of mechanically perturbed bean plants (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 62 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The mechanical properties of control and mechanically perturbed (MP) bean stems (Phaseolus vulgaris L., ev. Cherokee wax) were compared. The rubbed plants were greatly hardened against mechanical rupture by previous MP. This hardening was due to a dramatic increase in the flexibility of the stems, but not in their stiffness. The MP-plants were able lo bend more than 90° without breaking, whereas the control plants broke after just slight bending. A comparison with other work reveals that different species utilize different tactics for achieving similar resistance to rupture due to mechanical stress.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb05925.x
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  • 2
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: membrane lipid and protein changes in bean plants as affected by mechanical perturbation and Ethrel (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 58 (1983), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When bean plants (Phaseolus vulgaris L. cv. Red Cherokee Bush) are mechanically perturbed by rubbing, their stem elongation is inhibited and the stem thickness increases. The decrease in cell elongation and the increase in lateral cell divisions, which are partially responsible for this syndrome, were correlated with a decrease in the tree fatty acids and in the phospholipids of the membranes of microsomal fractions of first and second internodes of mechanically stimulated plants. This was true even though only the first internode was mechanically stimulated.Of the microsomal free fatty acids, mechanical perturbation induced an increase in myristic acid and large decreases in stearic, oleic, linoleic and linolenic acids. It also reduced the unsaturated:saturated ratio of the fatty acids. It induced a decrease in phosphatidyl choline but an increase in phosphatidyl ethanolamine. When the fatty acids were cleaved from the microsomal phospholipids, mechanical perturbation caused only a slight decrease in the unsaturated:saturated ratio and no significant changes in the double bond index.Mechanical perturbation induced an increase in the total microsomal protein and of membrane-associated latent IDPase. However, the activity of membrane-associated KCN-insensitive NADPH cytochrome-c reductase was decreased by mechanical perturbation.Treatment of the first internode with exogenous Ethrel produced results that were very similar in all respects to those obtained by mechanical perturbation. The factors inducing hardening against frost and drought, as achieved by mechanical perturbation and Ethrel treatment, are not only related to sterols or the polar head-groups of phospholipids but may also be related to the protein components, and all may have an effect on the fluidity of a bilayer membrane model. These data support the hypothesis that ethylene mediates thigmomorphogenesis and that mechanical perturbation of the first internode results in the acropetal transport of a translocatable thigmomorphogenetic factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1983.tb04169.x
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  • 3
    Electronic Resource
    Electronic Resource
    Physiological studies on pea tendrils. XII. Effects of temperature on contact coiling and uncoiling (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When excised tendrils of pea (Pisum sativum L. cv. Alaska 2B) are mechanically perturbed and allowed to coil at different constant temperatures, the greatest amount of coiling occurs between 27°C and 33°C. Coiling of tendrils continues for about 2 h after mechanical perturbation at which time uncoiling usually begins. The temperature at which the rate of uncoiling is greatest appears to be influenced, at least in part, by the temperature at which the tendrils coiled. For example, when tendrils coil at 20°C their rate of uncoiling at 20°C is less than if they had coiled at 23°C. Estimated activation energies for the uncoiling process are greater than for coiling, with 35 J/mol × s and 97 J/mol × s for uncoiling in the temperature ranges 18°C to 23°C and 10°C to 18°C, respectively. The estimated activation energy for coiling is 5.4 J/mol × s. It is suggested that the process of tendril uncoiling, as well as tendril coiling, might be an active, energy requiring process.When mechanically perturbed tendrils are placed in the cold (5°C) they do not coil. But this interruption of the coiling process with a cold (5°C) treatment, either immediately after mechanical perturbation or after coiling has begun, does not prevent coiling from continuing after tendrils are again given a more suitable temperature. It is concluded that the cessation of coiling during the cold period may be due to a slowdown in metabolism. It is suggested that there may be a factor which is responsible for the motor response and which is retained during the cold treatment.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb02285.x
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  • 4
    Electronic Resource
    Electronic Resource
    The Theory and Evidence on Real Estate Financial Decisions: A Review of the Issues (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Real estate economics 12 (1984), S. 0 
    Details
    ISSN: 1540-6229
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Economics
    Notes: There has developed a growing body of literature, both theoretically and empirically based, on real estate financial decisions. Despite these advances, there are a number of important issues that remain unanswered. The purpose of this paper is to provide a review and analysis of where research on real estate financial decisions has been, where it stands today, and where it is likely to be headed in the future. Some of the unresolved issues in real estate investment analysis are also discussed. The hope is that this review will provide the stimulus for solving some of these complex issues.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1540-6229.00328
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  • 5
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: The relationship of mechanical perturbation to elicitor-like activity and ethylene production (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 61 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: An extracellular solution obtained from bean (Phaseolus vulgaris L. cv. Resistant Cherokee Wax) stems induced phytoalexin-like substance and ethylene production in a soybean [Glycine max (L.) Merr. cv. Wayne] cotyledon bioassay. The elicitor-like activity for phytoalexin formation and ethylene production was increased by mechanical perturbation of bean stems. Moreover, the application of extracted or known elicitors to bean plants mimicked the effect of mechanical perturbation (i.e., inhibition of stem elongation and enhancement of radial growth). The effects of extract when applied exogenously, on elicitor-like activity in the bioassay as well as stem thickening were decreased by aminoethoxyvinylglycine, an inhibitor of ethylene biosynthesis. These results suggest that elicitor-like substances which are formed in response to mechanical perturbation contribute to the thigmomorphogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb06347.x
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  • 6
    Electronic Resource
    Electronic Resource
    Physiological studies on pea tendrils. XIII. Respiration is necessary for contact coiling (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 55 (1982), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When 9 day old light grown pea (Pisum sativum L. cv. Alaska 2B) plants are irrigated for 4–6 days with 50 μM 4-chloro-5-(dimethylamino)-2-(α, α, α-trifluoro-m-totyl)-3(2H)-pyridazinone, designated San-6706, the new leaves and tendrils grow morphologically normal, but with neither chlorophyll nor the ability to carry out photosynthesis. Excised tendrils from these plants coil in response to rubbing as well as those from water irrigated controls. Tendrils from San-6706 irrigated plants, which have been dark adapted for 2 or 3 days, proceed to coil when illuminated, just as do those from water irrigated plants. Rubbing of dark adapted tendrils results in an increased respiration rate over the first hour or two, when most of the coiling response occurs. Inhibitor studies indicate that blockage of oxidative phosphorylation, but not of the alternative, cyanide-insensitive, path of respiration, results in a failure of tendrils to coil in response to mechanical perturbation. It is concluded that the normal path of respiration, perhaps via ATP production, may be necessary for thigmosensory perception leading to contact coiling in pea tendrils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1982.tb02286.x
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  • 7
    Electronic Resource
    Electronic Resource
    Physiological studies on pea tendrils (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 50 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: When tendrils which have been dark adapted for 3 days are mechanically stimulated, they will only coil appreciably if they are irradiated with light. A spectral response curve suggests that this is a blue light effect. Red or far red light do not modulate this response, but a high intensity flash of blue white light given before the actinic blue light blocks coiling for 30 min. The dark-adapted tendril, which has not been previously rubbed, has the ability to store the tactile sensory information for about 60 min, but loses it if it is not irradiated within 120 min after mechanical perturbation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb02688.x
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  • 8
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: Ethylene evolution and its role in the changes observed in mechanically perturbed bean plants (1984)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 62 (1984), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Mechanical perturbations, in the form of either rubbing or wounding, cause ethylene evolution from bean internodes (Phaseolus vulgaris L. cv. Cherokee Wax). This evolution begins 45 to 60 min after perturbation or wounding and peaks about 2 h later. Maximal thigmomorphogenesis occurs if internodes are perturbed when they are 10 mm or less in length. Maximal ethylene evolution, however, occurs in longer internodes. When one internode is perturbed, ethylene evolution is not observed from other internodes even though they respond thigmomorphogenetically by exhibiting decreased elongation. Ethylene evolution is apparently a result of increased 1-amino-cyclopropane-1-carboxylic acid (ACC) production after perturbation. Inhibitors of ACC and ethylene synthesis block increased radial growth but not reduced elongation. Ethylene may therefore be only one of several factors causing thigmomorphogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1984.tb04575.x
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  • 9
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: Evidence for a translocatable thigmomorphogenetic factor induced by mechanical perturbation of beans (Phaseolus vulgaris) (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 50 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Mechanical perturbation of bean (Phaseolus vulgaris L.) internodes results in reduced elongation and increased diameter of the internodes (thigmomorphogenesis). Perturbation of a single lower internode results in thigmorphogenesis in that internode and all of those internodes above it, the degree of which depends on the age (size) of the internodes and the frequency of perturbation. Application of ethephon to the internodes mimics mechanical perturbation. Early removal of the shoot tip or the cotyledons does not effect thigmomorphogenesis, indicating that those organs do not exert control over the response. Mechanical perturbation of one plant of a pair grafted together at the first internodes results in thigmomorphogenesis in both plants. This indicates the transport of some factor from the mechanically perturbed donor to the non-treated receiver. Evidence is presented to support the contention that ethylene is not this transportable factor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb02677.x
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  • 10
    Electronic Resource
    Electronic Resource
    Thigmomorphogenesis: Calibration of the parameters of the sensory function in beans (1980)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 49 (1980), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract An instrument has been built which reproducibly exerts measured amounts of force in an up and down rubbing motion to bean plant stems (Phaseolus vulgaris L. cv. Cherokee Wax). The thigmostimulator has, for the first time, permitted an accurate determination of the relationship between the amount of mechanical stimulus or stress (MS) and the resulting elongation of the plant (E). Over the stress range used, the analyzed relationship is best expressed by the equation: E = m In MS + b, where m is the slope of the line and b is the E-intercept. The sensory function is saturated at very low forces (e.g. 2 rubs at 3.59 N). Reciprocity between force and the number of stimuli holds only at low forces and numbers of stimuli (e.g. 12 rubs at 0.97 N to four rubs at 2.92 N). Analysis using linear regression and differential calculus reveals that for five 1-cm rubs, the sensory system is saturated at 6 N and that there is a threshold of 0.3 N below which no response occurs. Using the thigmostimulator for calibration, two 1-cm rubs given by hand are equivalent to a force of 4.41 ± 0.60 N. The thigmostimulator also allows equivalent calibration of other types of mechanical perturbations.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1980.tb03326.x
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