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105. A bibliometric analysis of research papers published on photosynthesis: 1992-2009

Creator:
Yu, J. J., Wang, M. H., Xu, M., and Ho, Y. S.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
bibliometrie, bibliometrics, author keyword, research trend, scientometrics, science citation index expanded, 12, and 00
Language:
Multiple languages
Description:
We present here a bibliometric analysis of publications on photosynthesis research from 1992 to 2009 in the Science Citation Index Expanded (SCI-Expanded) Web of Science. This has allowed us to examine the growing trends and the key topics on this subject. We have assessed the document type, language of the publications, publication output, subject category, journal distribution, countries and territories of these publications, institutions involved, hot topics and highly cited papers. The top 30 countries/territories were ranked according to their total number of articles (TA), single country articles (SCA), internationally collaborative articles (ICA), first author articles (FAA) and corresponding author articles (CAA). Research directions on the subject of photosynthesis were also investigated and evaluated by statistically analyzing the distribution of author keywords in the database. Our analysis indicates that “water”, “stress”, “carbon dioxide”, “nitrogen” and “climate change” are hot topics of research on photosynthesis during this period., J. J. Yu ... [et al.]., and Obsahuje bibliografii
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

106. A cheap chlorophyll a fluorescence imaging system

Creator:
Lootens, P. and Vandecasteele, P.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
diuron and Zea mays
Language:
Multiple languages
Description:
A cheap chlorophyll (Chl) a fluorescence imaging system was developed for measuring leaf areas of 30×45 cm. Uniform saturating irradiances were created using CuSO4 filtered radiation from stroboscopes. The system was tested using maize leaves treated with diuron. Comparison was made with a small-area-measuring pulse amplified modulation Chl fluorometer. and P. Lootens, P. Vandecasteele.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

107. A chlorophyll fluorescence analysis of the allocation of radiant energy absorbed in photosystem 2 antennae of cotton leaves during exposure to chilling

Creator:
Kornyeyev, D., Logan, B. A., and Holaday, A. S.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
energy dissipation, Gossypium hirsutum, low temperature, and photoinhibition
Language:
Multiple languages
Description:
When dark-acclimated cotton (Gossypium hirsutum L. cv. Coker 312) leaves, pre-treated with lincomycin to inhibit chloroplast protein repair processes, were exposed to 10 °C and a PPFD of 500 μmol m-2 s-1, the proportion of excitation energy entering photochemistry (P) increased, but only to 5 % of the total energy absorbed at steady state levels of P, which were reached at 40 min of irradiation. Thermal dissipation (D) of absorbed energy increased throughout the 360 min irradiation period and accounted for the greatest portion of absorbed energy at 10 °C. When D was partitioned into constitutive (DCON), regulated (DREG), and photoinhibitory (DPI) components, it was primarily composed of DREG, the readily reversible portion of D. However, the induction of D was slow at 10 °C. Sixty minutes were required for D to reach 70 % of the energy absorbed. Considerable absorption of energy in excess of that utilized in photochemistry or dissipated thermally (designated as E) occurred, especially during induction of P and D. Over the irradiation period, the time-dependent averaged E exhibited an inverse, linear relationship with the ratio of variable (Fv) to maximum (Fm) fluorescence (PS2 efficiency) and a linear relationship with DPI. We propose that time-dependent averaged E may be useful for estimating the potential for damage to PS2 under stressful environmental conditions. and D. Kornyeyev, B. A. Logan, A. S. Holaday.
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

108. A comparative analysis of photosynthetic characteristics of hulless barley at two altitudes on the Tibetan Plateau

Creator:
Fan, Y. Z., Zhong, Z. M., and Zhang, X. Z.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
botanika, botany, altitude, apparent quantum efficiency, maximum net photosynthesis, and Tibetan Plateau
Language:
Multiple languages
Description:
To determine the photosynthetic characteristics of C3 plants and their sensitivity to CO2 at different altitudes on the Tibetan Plateau, hulless barley (Hordeum vulgare L. ssp. vulgare) was grown at altitudes of 4,333 m and 3,688 m. Using gas-exchange measurements, photosynthetic parameters were simulated, including the maximum net photosynthesis (Pmax) and the apparent quantum efficiency (α). Plants growing at higher altitude had higher net photosynthetic rates (PN), photosynthesis parameters (Pmax and α) and sensitivities to CO2 enhancement than plants growing at lower altitude on the Tibetan Plateau. The enhancements of PN, Pmax, and α for plants growing at higher altitude, corresponding with 10 μmol(CO2) mol-1 increments, were approximately 0.20∼0.45%, 0.05∼0.20% and 0.12∼0.36% greater, respectively, than for plants growing at lower altitude, respectively, where CO2 levels rose from 10 to 170 μmol(CO2) mol-1. Therefore, on the Tibetan Plateau, the changes in the photosynthetic capacities and the photosynthetic sensitivities to CO2 observed in the C3 plants grown above 3,688 m are likely to increase with altitude despite the decreasing CO2 partial pressure. and Y. Z. Fan ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

109. A comparison between yellow-green and green cultivars of four vegetable species in pigments, ascorbate, photosynthesis, energy dissipation, and photoinhibition

Creator:
Weng, J.-H., Chien, L.-F., Jiang, C.-Y., Shih, F.-C., and Chen, H.-Y.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
botanika, botany, Amaranthus tricolor, ascorbate-deficient, Brassica oleracea var. alboglabra, Brassica rapa, chlorophyll-deficient, energy dissipation, Ipomoea batatas, photoinhibition, and photosynthesis
Language:
Multiple languages
Description:
Yellow-green foliage cultivars of four vegetables grown outdoors, i.e., Chinese mustard (Brassica rapa), Chinese kale (Brassica oleracea var. alboglabra), sweet potato (Ipomoea batatas) and Chinese amaranth (Amaranthus tricolor), had lower chlorophyll (Chl) (a+b) (29-36% of green cultivars of the same species), total carotenoids (46-62%) and ascorbate (72-90%) contents per leaf area. Furthermore, yellow-green cultivars had smaller photosystem II (PSII) antenna size (65-70%) and lower photosynthetic capacity (52-63%), but higher Chl a/b (107-156%) and from low (60%) to high (129%) ratios of de-epoxidized xanthophyll cycle pigments per Chl a content. Potential quantum efficiency of PSII (Fv/Fm) of all overnight dark-adapted leaves was ca. 0.8, with no significant difference between yellow-green and green cultivars of the same species. However, yellow-green cultivars displayed a higher degree of photoinhibition (lower Fv/Fm after illumination) when they were exposed to high irradiance. Although vegetables used in this study are of either temperate or tropical origin and include both C3 and C4 plants, data from all cultivars combined revealed that Fv/Fm after illumination still showed a significant positive linear regression with xanthophyll cycledependent energy quenching (qE) and a negative linear regression with photoinhibitory quenching (qI). Fv/Fm was, however, not correlated with nonphotochemical quenching (NPQ). Yet, a higher degree of photoinhibition in yellow-green cultivars could recover during the night darkness period, suggesting that the repair of PSII in yellow-green cultivars would allow them to grow normally in the field. and J.-H. Weng ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

110. A comparison of chlorophyll fluorescence transient measurements, using Handy PEA and FluorPen fluorometers

Creator:
Padhi, B., Chauhan, G., Kandoi, D., Stirbet, A., Tripathy, Baishnab C., and Govindjee, G.
Format:
počítač and online zdroj
Type:
model:article and TEXT
Subject:
huseníček rolní, Arabidopsis thaliana, blue and red excitation light, fluorescence imaging, OJIP transient, 2, and 581
Language:
Multiple languages
Description:
We provide here a general introduction on chlorophyll (Chl) a fluorescence, then we present our measurements on fast (< 1 s) induction curves (the so-called OJIP transients) on dark-adapted intact leaves of Arabidopsis thaliana, under five different light intensities [in the range of ~ 500 to ~ 3,000 µmol(photons) m‒2 s‒1] using two different instruments: Handy PEA (Hansatech Instruments, UK; excitation light, 650 nm) and FluorPen (model FP-110; Photon Systems Instruments, The Czech Republic; excitation light, 470 nm). We then discuss the observed differences in the OJIP curves, as well as in Fo (F20μs, F50μs, or the extrapolated Ft→0), FP (the peak), and the ratios FP/Fo, and Fv (= FP ‒ Fo)/FP in terms of differences in excitation light intensity and absorptance (or absorbance) of the excitation light by the leaves, and other factors, as well as the data available in the literature. We suggest that such measurements be accompanied, in the future, by parallel measurements on Chl a fluorescence imaging, an area pioneered by Hartmut K. Lichtenthaler., B. Padhi, G. Chauhan, D. Kandoi, A. Stirbet, B. C. Tripathy, G. Govindjee., and Obsahuje bibliografické odkazy
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

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