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  • 1
    Electronic Resource
    Electronic Resource
    Water Transport Across Membranes (1972)
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Plant Physiology 23 (1972), S. 157-172 
    Details
    ISSN: 0066-4294
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1146/annurev.pp.23.060172.001105
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  • 2
    Electronic Resource
    Electronic Resource
    Responses to internal nitrogen and phosphorus concentrations of two Taraxacum microspecies of contrasting mineral ecology: critical N and P concentrations of whole plants (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 77 (1989), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Of the two Taraxacum microspecies used. Taraxacum sellandii Dahlst. usually occurs in grasslands with a high nutrient level; Taraxacum nordstedtii Dahlst. is generally restricted to undisturbed and mineral-poor habitats. Growth response curves for internal N and P were established, based on relative yield of (whole) plant tissue water and (whole plant) internal mineral concentration on a tissue water basis. Critical nutrient concentrations of N and P were determined from the response curves derived. For both macroelements, T. nordstedtii showed lower critical nutrient concentrations. The difference in critical N concentrations coincided with differences in internal NO3-3 concentrations between the microspecies. Finally, we discuss the use of tissue water as a (whole) plant growth parameter and internal mineral concentration on tissue water basis as a parameter describing the mineral status.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1989.tb05391.x
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  • 3
    Electronic Resource
    Electronic Resource
    The effect of short-term H2S fumigation on water-soluble sulphydryl and glutathione levels in spinach (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Plant, cell & environment 8 (1985), S. 0 
    Details
    ISSN: 1365-3040
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Abstract. Short-term fumigation of Spinacia oleracea with 380 μg m−3 H2S (250 ppb) resulted in a rapid accumulation of water-soluble SH-compounds in the shoots. After 1 h exposure a substantial increase in the SH-content was already detectable and maximal accumulation, three- to four-fold that in control plants, was observed after 24 h of exposure. Irradiation during H2S exposure only slightly affected the rate and level of SH-accumulation. H2S fumigation did not affect the water-soluble SH-content of the roots. Glutathione was the sole water-soluble SH-compound accumulating upon exposure to H2S. It was calculated that during the first hour of exposure to 380 μg m−3 H2S 39% of the possible absorbed H2S was converted into glutathione. The SH-content of the water-soluble proteins of the shoots was not affected by H2S exposure. When fumigation was stopped, a rapid decrease in glutathione content was observed and after 48 h the content was comparable to that of the control plants. Contrary to H2S, SO2 fumigation did not result in a rapid accumulation of glutathione in spinach shoots. The possible role of glutathione accumulation during H2S fumigation is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/1365-3040.ep11604605
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  • 4
    Electronic Resource
    Electronic Resource
    Lipid composition of pine needle chloroplasts and apple bark tissue as affected by growth temperature and daylength changes. 2. Glycolipids, neutral lipids and chlorophyll (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 71 (1987), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Glycolipids, neutral lipids and chlorophyll of chloroplasts of pine needles (Pinus sylvestris L.) and apple bark tissue (Malus sylvestris Mill. cv Golden Delicious) were determined in a series of experiments in which growth temperature and daylength were changed. Trees were exposed to 0 and 20°C and to daylength conditions of 9 and 14 h. All 16 possible combinations were studied by transfer of the trees from the original condition to each of the other conditions. There was no direct relation between cold hardiness and glycolipid composition in apple bark and pine chloroplasts, when temperature and/or daylength were changed. Glycolipid and neutral lipid composition seemed to be strongly determined by the sequence of the imposed sets of daylength and temperature, and the effects of these factors on lipids strongly differed from that on cold hardiness. When the treatments were given in seasonal order, the corresponding changes in chloroplast glycolipids matched those reported in the literature for needles collected in the forest the year around. Glycolipid synthesis could well be under phytochrome control.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1987.tb02878.x
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  • 5
    Electronic Resource
    Electronic Resource
    Fatty Acid Levels in Apple Leaves of Different Age as Affected by Temperature (1979)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 46 (1979), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Relative electrical conductivity (RC) values and Tally acid levels were measured on apple leaves of different ages exposed to 0 and 20°C. RC values were measured at—3°C and high RC values indicate frost-sensitive tissue. A prolonged period at 0°C gave an increased RC value of the leaves, which indicates damage. At 20°C the RC values were lower in older leaves than in young leaves.The fatty acids level as well as the degree of saturation were different at different ages of the leaves. Young leaves showed a higher fatty acid level in plants held at 20°C than in plants at 0°C. The older leaves maintained the same level after 12 days at 20°C as after 3 days at 20°C. The fatty acid level decreased at 0°C. The linolenic acid level followed the same trend as total fatty acids, indicating that synthesis and degradation of linolenic acid can occur in the same plant depending on the age of the leaf and on the temperature. Cold resistance and linolenic acid levels were correlated in both old and young leaves at 20°C and in older leaves at 0°C. There was no correlation between cold resistance and levels of linotenic acid levels in young leaves at 0°C. Two hiosynthetic pathways for linolenic acid synthesis are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1979.tb06538.x
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  • 6
    Electronic Resource
    Electronic Resource
    Lipids from Bean, Barley and Sugar Beet in Relation to Salt Resistance (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 42 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A comparison was made between the lipid and fatty acid composition of the salt-sensitive bean (Phaseolus vulgaris L. cv. Saxa), the less salt-sensitive barley (Hordeum vulgaris L. cv. Wisa) and the salt-tolerant sugar beet (Beta vulgaris L. cv. Kawemono). Sugar beet roots showed a higher content of sterol components and sulfolipid as compared with bean and barley roots. The lipids of sugar beet roots contained more linoleic acid and less linolenic acid than those of bean and barley roots. For barley and sugar beet roots a higher amount of extra-long chain fatty acids was observed than for bean roots. It was concluded that differences in membrane structure are correlated with differences in membrane permeability to sodium and chloride and in salt-resistance of the studied species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb01551.x
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  • 7
    Electronic Resource
    Electronic Resource
    Cold Hardiness of Pine Needles and Apple Bark as Affected by Alteration of Day Length and Temperature (1978)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 44 (1978), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Cold hardiness of pine needles and apple bark was determined in a series of experiments. Plants were exposed to 0°C and 20°C and exposed to day length conditions of 9 and 14 h. All 16 possible combinations were investigated by transfer of the plants from the original condition to each of the other conditions. In order to interpret the results, it was necessary to distinguish between a single and a dual environmental factor change. In pine plants at 20°C, a change in two factors decreased cold hardiness contrary to a single change in temperature or day length. In plants at 0°C, the effects of a change in day length and temperature were additive. Differences in pine and apple are discussed in relation to natural conditions and to geographical distribution. It is suggested that for increased hardiness shortening of day length should precede a low temperature regime and that reversal of this order may upset the signal system, resulting in dehardening.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1978.tb01638.x
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  • 8
    Electronic Resource
    Electronic Resource
    Properties of (Sodium Potassium)-Stimulated ATPases in English Ryegrass Roots and Implications in Ion Transport (1975)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 35 (1975), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Maximum ATPase activities in the cell wall fraction of English ryegrass (Lolium perenne L.) roots were stimulated by foru discrete millimole ratios of (Na++ K+); 40:0, 35:5, 5:35, and 0:40. The optimal pH for stimlation was found to be 6.5. Contrary to data in the literature, Mg2+ inhibited all stimulatory ratios of (Na++ K+) when plants were cultured on an adequate nutrient solution. When grown on a dilute solution, Mg2+ enhanced (Na++ K+)-stimulated ATPase activity in this membrane preparation. The single optimal combined concentration of (Na++ K+) for all stimulatory ratios was 40 MM. The ratios of (Na++ K+) which stimulated ATPase activity in the cell wall fraction varied with position along the root axis such that all rarely existed simultaneously nor did any exist in the terminal millimetre of the root. Both cell wall and microsomal fractions showed stimulation by (Na++ K+) at all the above ratios indicating the possible presence of plasma membrane fragments in both fractions. Only the 35:5 ratio was stimulations were found in the supernatant. Implications of ion-stimulated ATPase involvement in ion transport were drawn from the appearance of ATPase activity at a 40:0 ratio of (Na++ K+) and the disappearance of stimulations at 35:5, 5:35, and 0:40 ratios when plants were moved from a strong (35 mM total concentration) to a dilute (0.75 mM) nutrient solution.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03904.x
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  • 9
    Electronic Resource
    Electronic Resource
    Permeability and Self-Induction as Factors in Water Transport through Bean Roots (1974)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 31 (1974), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Water uptake of root systems of Phaseolus vulgaris was measured in a Scholander pressure cylinder at a constant pressure. Water uptake rises gradually till a steady state is reached after 15 to 60 minutes. This time course can be described as a transport process with the property of a self-induction. The latter was not affected by temperature. It is concluded that the property of self-induction is located in the cytoplasm or at the interface between cytoplasm and plasmalemma of the endodermal cells. It is suggested that cytoplasmic streaming controls the time course of water transport.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1974.tb03683.x
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  • 10
    Electronic Resource
    Electronic Resource
    Temperature Response of Adenosine Triphosphatase of Bean Roots as Related to Growth Temperature and to Lipid Requirement of the Adenosine Triphosphatase (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 26 (1972), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The ATPase activity of the cell wall, mitochondrial and microsomal fractions of bean roots (Phaseolus vulgaris) shows non-linear curves when plotted logarithmically against temperature, producing high Q10-values in the low temperature range and low Q10-values in the high temperature range. The Q10-valuc of supernatant ATPase is constant and low as well as the Q10-value of soluble ATPase liberated from membranes. Cell wall ATPase from bean roots adapted to a low temperature has a much smaller temperature response. Such roots contain a larger quantity of membrane-bound ATPase and a smaller amount of soluble ATPase than roots adapted to a high temperature.Extraction of soluble ATPase with acetone reduces activity to practically zero, but activity could be partially restored by the addition of lipid. The temperature response of reconstituted phosphatidyl choline-ATPase is inconsiderable. That of reconstituted sulfolipid-ATPase is much larger.I am indebted to Bep Stuiver for skillful assistance with the experiments, to Ir. F. Kuiper and Mr. C. H. Vermeulen for help with the cultivation of the bean plants and to Prof. Dr. E. C. Wassink for reading the manuscript.Communication 292 of the Laboratory of Plant Physiological Research, Agricultural University, Wageningen, The Netherlands.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1972.tb03568.x
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