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3. Gas exchange and chlorophyll fluorescence response to simulated rainfall in Hedysarum fruticosum var. mongolicum

Creator:
Niu, S. L., Li, L. H., Jiang, G. M., Gao, L. M., Li, Y. G., Peng, Y., and Liu, M. Z.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
apparent carboxylation efficiency, gas exchange, leaf water potential, net photosynthetic rate, soil water content, and stomatal conductance
Language:
Multiple languages
Description:
The response of gas exchange and chlorophyll fluorescence along with changes in simulated rainfall were studied in water stressed plants Hedysarum fruticosum var. mongolicum (H.f.m.). Net photosynthetic rate (PN), stomatal conductance (gs), leaf water potential (Ψleaf), and apparent carboxylation efficiency (PN/Ci) were significantly increased with the increase of rainfall. However, they did not change synchronously. The complete recovery of both PN and PN/Ci appeared 3 d after watering while gs and Ψleaf were recovered 1 d after treatment. Gas exchange characters increased sharply from 5 to 15 mm rainfall and then maintained steady state with increasing rainfall. During the initial phase of water recovery, photosystem 2 (PS2) activity was not affected and its complete recovery occurred also 3 d after rainfall. Hence the recovery of PN was attributed to both opening of stomata and increase in carboxylation efficiency. Furthermore, PS2 activity was really impaired by water stress and could recover to the normal status when the water stress disappeared. and S. L. Niu ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

4. Interactions of chlorophyll and polypeptide mixture with bacterial reaction centres

Creator:
Enomoto, H., Takeda, S., Nakamura, C., Miyake , J., Ptak, A., Dudkowiak, A., and Frąckowiak, D.
Format:
bez média and svazek
Type:
model:article and TEXT
Subject:
absorption spectra, fluorescence spectra, photoacoustic spectra, Rhodobacter sphaeroides, and thermal deactivation
Language:
Multiple languages
Description:
In aqueous solutions of chlorophyll (Chl) a with synthesized polypeptides, at high ratios of Chl to polypeptides (about 75-150 µM to 500 µM) clusters of polypeptides and pigment molecules were formed. The main absorption maxima of more than one formed cluster were located at about 500 nm (Soret band) and in the region of 720-806 nm (red band). The formation of these clusters was fairly slow (some hours) at room temperature and even slower at 4 °C. The rate of cluster formation increased with the increase in Chl concentration. The addition of the even low amount of reaction centres (RCs), separated from the purple bacteria Rhodobacter sphaeroides, to the sample of Chl with polypeptides caused a very strong decrease in the efficiency of cluster formation, and a change in concentration ratios of various pigment-polypeptide aggregates. It was probably a competition between the interaction of Chl with polypeptides and with the RCs. The yield of thermal deactivation of the clusters was high, much higher than that for the RCs alone and it was different for various types of cluster. The clusters absorbing at 725-750 nm were fluorescent with maximum of emission at about 770 nm, whereas clusters absorbing at about 800 nm were nonfluorescent. and H. Enomoto ... [et al.].
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public

5. Zdeněk Šesták and Photosynthetica, a tribute

Creator:
Lichtenthaler, H. K.
Format:
print, bez média, and svazek
Type:
model:article and TEXT
Subject:
Šesták, Zdeněk, 1932-2008, odborné časopisy, fotosyntéza, professional journals, photosynthesis, 2, and 581
Language:
Multiple languages
Description:
On the occasion of the 50th anniversary of the international journal Photosynthetica in 2017 we briefly report on the establishment of this journal and on Dr. Zdeněk Šesták, the renowned researcher of photosynthesis processes who, in cooperation with the Czechoslovak Academy of Sciences, founded this essential science journal in Prague in 1967., H. K. Lichtenthaler., Obsahuje bibliografii, and Ozvláštněné číslování stránek článku 1-6. teprve na ně se napojuje pokračování stránkování navazující na 1. číslo časopisu
Rights:
http://creativecommons.org/licenses/by-nc-sa/4.0/ and policy:public