Menge und Verhältnis der Pigmente

Egle, K.

doi:10.1007/978-3-642-94798-8_19

Cited by 16 publications

(6 citation statements)

References 199 publications

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“…The increase in chlorophyll b caused a signifi cant decline in the chlorophyll alb ratio in leaves growing under the 92% shade treatment. Decreasing chlorophyll alb ratios in response to shade have been previously docu mented (2,3,12). The increase in the relative proportion of chlorophyll b may be an adaptation of the photosynthetic apparatus to shade.…”

Section: Shade (%)mentioning

confidence: 81%

Effects of Shade on Silverleaf Nightshade (Solanum elaeagnifolium)

Boyd¹

1982

Weed sci.

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Plants started with seed, 'seedlings', and established plants of silverleaf nightshade (Solanum elaeagnifoliumCav.) were grown in the field under shade levels of 0, 47, 63, and 92% of full sunlight to determine vegetative, reproductive, and physiological responses to shade. Dry-matter production of both 'seedling’ and established plants declined markedly with increasing shade levels. Established plants did not bear fruit under 92% shade, and 63% shade prevented fruit production by 'seedlings'. Taproots of plants grown in full sunlight contained 16% more total non-structural carbohydrate (TNC) per gram dry weight than taproots of plants grown under 92% shade. Leaves of established plants grown under moderate shade had significantly more chlorophyll per unit leaf fresh weight than plants grown in full sunlight; however, plants under heavy (92%) shade had 35% less chlorophyll per unit leaf area than unshaded plants. The chlorophylla/bratio of the 92%-shaded plants was significantly less than with other treatments. Leaf area increased, with increasing shade; however, leaf weight per unit area decreased because of thinner leaves. Photosynthetic rates of recently expanded leaves were 10.4, 4.6, 3.3, and 0.9 mg CO2· dm−2· h−1for the 0, 47, 63, and 92% shade treatments, respectively.

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Section: Shade (%)mentioning

confidence: 81%

Effects of Shade on Silverleaf Nightshade (Solanum elaeagnifolium)

Boyd¹

1982

Weed sci.

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“…Reduction of pigment in strong light is a general phenomenon in higher plants (Egle, 1960;BjSrkman, 1973), as well as in phytoplankton (Harris, 1978), and a recent demonstration of this effect in various seaweeds has been achieved in field experiments by Ramus et al (1976a, b). According to Harris (1978), in algae the greatest changes in the cellular content of chlorophyll occur in the range 50-100 ~E m-2s -I (equivalent to about 2500-5000 lux in daylight or white fluorescent light).…”

Section: Discussionmentioning

confidence: 99%

Growth rates of North Sea macroalgae in relation to temperature, irradiance and photoperiod

Fortes

Lüning

1980

Helgolander Meeresunters

206

123

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Three eulittoral algae (Ulva lactuca, Porphyra umbilicalis, Chondrus crispus) and one sublittoral alga (Laminaria saccharina) from Helgoland (North Sea) were cultivated in a flowthrough system at different temperatures, irradiances and daylengths. In regard to temperature there was a broad optimum at 10-15 °C, except in P. umbilicalis, which grew fastest at 10 °C. A growth peak at this temperature was also found in four of 17 other North Sea macroalgae, for which the growth/temperature response was studied, whereas 13 of these species exhibited a growth optimum at 15 °C, or a broad optimum at 10-15 °C. Growth was light-saturated in U. lactuca, L. saccharina and C. crispus at photon flux densities above 70 #E m2s 1, but in P. umbilicalis above 30 pE m2s -1. Growth rate did not decrease notably in the eulittoral species after one week in relatively strong light (250 pE m-2s~), but by about 50 % in the case of the sublittoral L. saccharina, as compared with growth under weak light conditions (30 #E m2sl). In contrast, chlorophyll content decreased in the sublittoral as well as in the eulittoral species, and the greatest change in pigment content occurred in the range 30-70/zE m2s -1. Growth rate increased continuously up to photoperiods of 24 h light per day in L. saccharina and C. crispus, whereas daylength saturation occurred at photoperiods of more than 16 h light per day in U. lactuca and P. umbilicalis.

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“…The aid of Dr. Donald L. Keister, Dr. Berger C. Mayne and Elwood Shaw with the use of equipment and for valuable advice is gratefully acknowledged. light environment (Rabinowitch, 1945;Egle , 1960;Bjorkman and Holmgren, 1963). These shifts in pigment composition suggest a remodeling of photosynthetic unit size dependent upon the radiant environment of the plant leaf.…”

mentioning

confidence: 99%

Seasonal Alteration of Photosynthetic Unit Sizes in Three Herb Layer Components of a Deciduous Forest Community

Harvey

1980

American J of Botany

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The pigment content and photosynthetic unit size of three herbs on the floor of a mature yellow oak (Quercus meuhlenbergii) forest were measured during most of the growing season. Two species, dutchman's breeches (Dicentra cucullaria) and Virginia bluebell (Mertensia virginica) are spring ephemerals, while Hepatica acutiloba has a semi‐evergreen habit. Although pigment composition changed in Dicentra, photosynthetic unit size only varied slightly. Mertensia was nearly invariant in pigment composition, but unit size was modified as the growing season progressed. The semi‐evergreen herb, Hepatica, underwent a remarkable alteration in pigment content, photosynthetic unit size, and number following overstory leaf expansion. The results indicate that an alteration of photosynthetic unit size is possible in fully expanded leaves of two forest floor herbs.

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Menge und Verhältnis der Pigmente

Cited by 16 publications

References 199 publications

Effects of Shade on Silverleaf Nightshade (Solanum elaeagnifolium)

Effects of Shade on Silverleaf Nightshade (Solanum elaeagnifolium)

Growth rates of North Sea macroalgae in relation to temperature, irradiance and photoperiod

Seasonal Alteration of Photosynthetic Unit Sizes in Three Herb Layer Components of a Deciduous Forest Community

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