Photosynthetica - Ahead of Print
Development and aging of photosynthetic apparatus of Vitis vinifera L. during growing season
K. SITKO, S. RUSINOWSKI, M. POGRZEBA, A. DASZKOWSKA-GOLEC, Ż. GIEROŃ, H.M. KALAJI, E. MAŁKOWSKI
Photosynthetica X:X | DOI: 10.32615/ps.2019.107
The aim of this study was to examine the development and aging of chosen grapevine leaves in situ during the growing season (130 d) using chlorophyll (Chl) a fluorescence measurements and determining the changes in pigment contents. During the course of photosystems development, the increase of Chl and decrease of anthocyanin contents in leaves was observed simultaneously. On 28th day, the maximum content of Chl and minimum content of anthocyanins was measured. However, the maximal photosynthetic performance was found one week later, when the content of Chl started to diminish. Our study proved that the achievement of maximal...
Plant biomass in salt-stressed young maize plants can be modelledwith photosynthetic performance
V. GALIĆ, M. MAZUR, D. ŠIMIĆ, Z. ZDUNIĆ, M. FRANIĆ
Photosynthetica X:X | DOI: 10.32615/ps.2019.131
Predicting responses to stressful conditions is very important. Chlorophyll a fluorescence (ChlF) can be used to assess effects of various stresses on photosynthetic performance. We tested the responses of five 10-d old maize hybrids to salinity stress by measuring ChlF parameters, fresh (FM) and dry mass (DM). ChlF data were incorporated into a penalized regression model to predict biomass traits. The values of FM and DM significantly decreased under salt stress by 42 and 25%, respectively. Strong responses in ChlF parameters assessing the absorption dissipation and trapping fluxes to NaCl treatment were detected. In penalized regression models,...
Structural and functional response of photosynthetic apparatus of radish plants to iron deficiency
I.A. SAMBORSKA-SKUTNIK, H.M. KALAJI, L. SIECZKO, W. BĄBA
Photosynthetica X:X | DOI: 10.32615/ps.2019.132
In this work, we tried to identify some specific chlorophyll a fluorescence (ChlF) parameters, that could enable detection of iron deficiency (Fedef) in radish plants (Raphanus sativus L.), before any visual symptoms appear. Changes in ChlF kinetics, JIP-test parameters, and chlorophyll content revealed that iron deficiency negatively affected PSII activity mainly via disruption of light absorption in light-harvesting complexes and by decreasing the activity of the primary quinone acceptor of PSII (QA). Iron deficiency was clearly reflected in the changes of some JIP-test parameters, such as time to reach...
Photosynthetic characteristics and chlorophyll a fluorescence induction parameters in elite clone (GS1) of Pinus sylvestris var. mongolica
P. MENG, G.C. YOU
Photosynthetica X:X | DOI: 10.32615/ps.2019.133
We selected the elite clone of Pinus sylvestris var. mongolica 'GS1' from 365 clones in a primary seed orchard in Liaoning Province, China. To understand the photosynthesis characteristics and mechanisms, 40-year-old 'GS1' trees were compared with a common clone 'H524' of the same age at the same seed orchard. Results showed that 'GS1' had higher net photosynthetic rate because of higher stomatal conductance (gs); the larger external and inner diameters of stomata were the structural factors enabling maintenance of higher gs. The higher light-saturated net photosynthetic rate of 'GS1' was mainly due...
Inhibition of photosynthesis in cucumber leaves by oxybenzone
X. ZHONG, Y.T. LI, Z.S. ZHANG, S.H. LI, Y.M. LI, B.B. LIU, Q.M. LI, H.Y. GAO
Photosynthetica X:X | DOI: 10.32615/ps.2019.135
Oxybenzone (OBZ), a popular additive in sunscreen, can protect human skin by blocking ultraviolet (UV) rays from the sun (Baker et al. 2015). In addition to being used in sunscreens, OBZ is also widely used in perfumes, shampoos, lip balms, and other pharmaceuticals and personal care products (PPCPs) (Aguirre et al. 1992, Emonet et al. 2001, Kasichayanula et al. 2007). OBZ can enter rivers, lakes, groundwater, sewage, and so on through human activities and was identified as an 'emerging environmental pollutant' by the Environmental Protection Agency of the USA (Rodil et al. 2012, Agüera et al. 2013). With...