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  • 1
    Electronic Resource
    Electronic Resource
    Adaptability of tomato and pepper leaves to changes in photoperiod: Effects on the composition and function of the thylakoid membrane (1995)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 94 (1995), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The adaptability of the thylakoid membrane to extended photoperiod (from natural to 24 h) was studied using a photoperiod-sensitive species (Lycopersicon esculentum Mill. cv. Trend) and a non-photoperiod-sensitive species (Capsicum annuum L. cv. Delphin). Our results have shown that thylakoid membranes of both species adapt to an extended photoperiod by increasing their photosystem II to photosystem I ratio (PSII/PSI) in order to provide a more balanced energy distribution between both photosystems to improve quantum yield. In tomato plants, these results correspond with a lower chlorophyll (Chl) a/b ratio, a decrease in Chl associated with PSI light-harvesting chlorophyll a/b protein complexes and with an increase in Chl associated with PSII light-harvesting chlorophyll a/b protein complexes. In spite of these changes, the electron transport capacity through PSII and PSI per unit of Chl and the light saturation point of PSII remained unchanged. The inability of tomato plants to use supplemental light for an extended photoperiod is not the result of photoinhibitory conditions. In pepper plants a significant increase in electron transport capacity and in the light saturation point of PSII was found. There was a significant increase in CO2 assimilation when the light period was increased from 12 to 24 h. In contrast to tomato, pepper plants adapt to a 24-h photoperiod by increasing their carboxylation capacity which is accompanied by an increase in electron transport capacity and the light saturation point.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1995.tb00986.x
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  • 2
    Electronic Resource
    Electronic Resource
    Stomatal limitation of photosynthesis in winter production of greenhouse tomato plants (2000)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 110 (2000), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In May, greenhouse tomato (Lycopersicon esculentum Mill.) plants near the end of their winter production cycle were shown to exhibit a diurnal photosynthetic decrease. In order to identify the physiological causes of this decline, we compared in May the photosynthetic characteristics of the fifth youngest leaves from tomato plants of different ages corresponding to a winter production (11-month-old plants) and to a spring production (5-month-old plants). Although the leaves were developed simultaneously under the same environmental conditions, only the ones from the winter production showed a diurnal decline of the in situ CO2 assimilation rate (ACO2). This was accompanied by a decline of internal CO2 and stomatal conductance and by large accumulations of hexoses. When stomatal closure was relieved under saturated CO2 concentration (5%) using a leaf-disc electrode system, the fifth leaves of both tomato cultures had similar maximum quantum efficiency of O2 evolution (Φmax), light-saturated rate of O2 evolution (Pmax) and quantum efficiency of photosystem II (PSII) photochemistry (ΔF/F′m, qP and qN). We concluded that the diurnal decline of ACO2 observed in winter tomato production during May originates from a stomatal limitation that is not dependent on environmental conditions but rather related to the developmental stage of the plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2000.1100420.x
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  • 3
    Electronic Resource
    Electronic Resource
    Influence of root-zone temperature on growth, development and yield of cucumber plants cv. Toska (1985)
    Springer
    Plant and soil 85 (1985), S. 327-336 
    Details
    ISSN: 1573-5036
    Keywords: Cucumis sativa L. ; Cucumber ; Root-zone ; Warming ; Night air temperature ; Split night temperature
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary In a first experiment, cucumber transplants (cucumis sativa L. cv. Toska) were grwon at five root-zone temperatures (RZT) ranging from 12° to 36°C. Maximum shoot growth and total leaf area were obtained at 24° and 30°C (RZT). In a second experiment, cucumber transplants were submitted to five RZT (12, 18, 24, 30 and 36°C) and five night air temperatures (NAT) that were maintained either constant at 9°, 13° and 17°C or splitted (in two halfs) at midnight (17°/12°C, 17°/9°C). Root-zone warming to 24° or 30°C increased cucumber plant growth and leaf development, but did not compensate completely the loss of productivity induced by low NAT. Split-night temperature had greater effects under the lowest NAT (17°/9°C) and at high RZT (24° or 30°C). In a third experiment, soil warming caused large increase in yields when cucumber plants were grown in the spring, but had very little effects in the fall.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02220188
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