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    Wyświetlanie 1-7 z 7
    Tytuł:
    Variable chlorophyll fluorescence and its use for assessing physiological condition of plant photosynthetic apparatus
    Autorzy:
    Horaczek, T.
    Goltsev, V. N.
    Kozel, H.
    Kalaji, H. M.
    Bąba, Wojciech
    Allakhverdiev, S. I.
    Paunov, M.
    Moyski, J.
    Opis:
    Analysis of plant behavior under diverse environmental conditions would be impossible without the methods for adequate assessment of the processes occurring in plants. The photosynthetic apparatus and its reaction to stress factors provide a reliable source of information on plant condition. One of the most informative methods based on monitoring the plant biophysical characteristics consists in detection and analysis of chlorophyll a f luorescence. Fluorescence is mainly emitted by chlorophyll a from the antenna complexes of photosystem II (PSII). However, f luorescence depends not only on the processes in the pigment matrix or PSII reaction centers but also on the redox reactions at the PSII donor and acceptor sides and even in the entire electron transport chain. Presently, a large variety of fluorometers from various manufacturers are available. Although application of such f luorometers does not require specialized training, the correct interpretation of the results would need sufficient knowledge for converting the instrumental data into the information on the condition of analyzed plants. This review is intended for a wide range of specialists employing fluorescence techniques for monitoring the physiological plant condition. It describes in a comprehensible way the theoretical basis of light emission by chlorophyll molecules, the origin of variable fluorescence, as well as relations between the f luorescence parameters, the redox state of electron carriers, and the light reactions of photosynthesis. Approaches to processing and analyzing the f luorescence induction curves are considered in detail on the basis of energy f lux theory in the photosynthetic apparatus developed by Prof. Reto J. Strasser and known as a "JIP-test." The physical meaning and relation of each calculated parameter to certain photosynthetic characteristics are presented, and examples of using these parameters for the assessment of plant physiological condition are outlined.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Detection of multi-nutrients deficiency in cereal plants by the use of chlorophyll fluorescence
    Autorzy:
    Jaszczuk, Zuzanna M.
    Bąba, Wojciech
    Tematy:
    abiotic stress
    JIP test
    photosynthesis
    Triticum aestivum
    Zea mays
    Pokaż więcej
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Powiązania:
    https://bibliotekanauki.pl/articles/28411656.pdf  Link otwiera się w nowym oknie
    Opis:
    Nutrient deficiency (ND) stands as a prominent environmental factor that significantly impacts global plant growth and productivity. While numerous methods have been employed for detecting nutrient deficiencies in plants, many of them are invasive, time-consuming, and costly. In contrast, chlorophyll fluorescence (ChlF) signals have emerged as a non-destructive tool for the identification of specific nutrient deficiencies, such as nitrogen (N), phosphorus (P), and potassium (K), across various plant species. In this pioneering study, ChlF measurements were employed for the first time to detect a combination of nutrient deficiencies, including deficiencies in nitrogen and phosphorus (-NP), nitrogen and potassium (-NK), potassium and phosphorus (-KP), and a complete NPK deficiency (-NPK). The experiment was conducted using wheat (Triticum aestivum) and maize (Zea mays) plants, which were grown under controlled laboratory conditions. An optimal hydroponic system was established to facilitate eight experimental conditions, namely: control, -N, -P, -K, -NP, -NK, -KP, and -NPK. Measurements were systematically collected at two-day intervals over a span of 24 days. Our findings demonstrate that chlorophyll fluorescence signals can enable the differentiation of various nutrient deficiencies even prior to the onset of observable symptoms. Furthermore, the examination of chlorophyll fluorescence parameters enables us not only to identify a singular macronutrient deficiency but also to detect multiple macronutrient deficiencies concurrently in a plant.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Early detection of phosphorus deficiency stress in cucumber at the cellular level using chlorophyll fluorescence signals
    Autorzy:
    Sieczko, Leszek
    Dąbrowski, Piotr
    Kowalczyk, Katarzyna
    Gajc-Wolska, Janina
    Borucki, Wojciech
    Janaszek-Mańkowska, Monika
    Kowalczyk, Waldemar
    Farci, Domenica
    Kalaji, Hazem M.
    Tematy:
    abiotic stress
    chlorophyll fluorescence
    cucumber
    JIP test
    multidimensional statistical analysis
    photosynthesis
    Pokaż więcej
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Powiązania:
    https://bibliotekanauki.pl/articles/2203572.pdf  Link otwiera się w nowym oknie
    Opis:
    Abiotic stressors contribute to growth restriction and developmental disorders in plants. Early detection of the first signs of changes in plant functioning is very important. The objective of this study was to identify chlorophyll fluorescence parameters that change under phosphorus deficiency stress in cucumber. In this work, a trail to study the early changes caused by phosphorus deficiency in cucumber plants by analysing their photosynthetic performance is presented. Chlorophyll-a fluorescence (ChF) parameters were measured every 7 days for a period of 28 days. Measurements were made separately on young and old leaves and on cucumber fruit. Parameters that decreased during the stress were: p2G, PI abs, PI total, REo/CSo, and TRo/CSo. P deficiency decreased total electron carriers per RC (ECo/RC), yields (TRo/ABS (Fv/Fm), ETo/TRo, REo/ETo, ETo/ABS and REo/ABS), fluxes (REo/RC and REo/CSo) and fractional reduction of PSI end electron acceptors, and damaged all photochemical and non-photochemical redox reactions. Principal component analysis revealed a group of ChF parameters that may indicate early phosphorus deficiency in cucumber plants. Our results are used in the discovery of sensitive bioindicators of phosphorus deficiency in cucumber plants. Most JIP test parameters are linked to mathematical equations, so we recommend using of advanced statistical tools, such as principal component analysis, which should be considered very useful for stress identification. It has also been shown to be more effective in multivariate methods compared to univariate statistical methods was demonstrated.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of photochemical parameters and several indices based on phenotypical traits to assess intraspecific variation of oat (Avena sativa L.) tolerance to drought
    Autorzy:
    Grzesiak, Stanisław
    Warchoł, Marzena
    Grzesiak, Maciej T.
    Czyczyło-Mysza, Ilona
    Skrzypek, Edyta
    Marcińska, Izabela
    Popielarska-Konieczna, Marzena
    Opis:
    Functionality of the photosynthetic system under water stress is of major importance in drought tolerance. Oat (Avena sativa L.) doubled haploid (DH) lines obtained by pollination of F_{1} oat crosses with maize were used to assess the differences in plant genotypic response to soil drought. The investigations were based on the measurements of gas exchange and chlorophyll a fluorescence kinetics. Drought was applied to 17-day-old seedlings by withholding water for 14 days and subsequent plant recovery. Non-stressed optimally watered plants served as controls. Yield components were determined when plants reached full maturity. It was shown differences among the oat lines with respect to drought stress susceptibility (SI) and stress tolerance index mean productivity and drought susceptibility index. Sensitivity to drought of individual DH lines was significantly different, as demonstrated by the correlation between drought susceptibility index and yield components, such as dry weight (GW) or grain number (GN) of the harvested plants. GW and GN were lower in drought-sensitive genotypes exposed to drought stress compared to those resistant to drought. The principal component analysis allow to separate three groups of lines differing in their sensitivity to drought stress and indicated that tolerance to drought in oat has a common genetic background.
    Dostawca treści:
    Repozytorium Uniwersytetu Jagiellońskiego
    Artykuł
    Tytuł:
    Influence of induced drought on photosynthetic performance in Dactylis glomerata varieties during the early growth stage
    Autorzy:
    Borawska-Jarmułowicz, Barbara
    Mastalerczuk, Grażyna
    Dąbrowski, Piotr
    Tuchowska, Żaneta
    Kalaji, Hazem
    Tematy:
    chlorophyll a fluorescence transient
    Dactylis glomerata
    JIP test
    tillering phase
    water deficit
    Pokaż więcej
    Wydawca:
    Instytut Technologiczno-Przyrodniczy
    Powiązania:
    https://bibliotekanauki.pl/articles/58906923.pdf  Link otwiera się w nowym oknie
    Opis:
    Drought significantly impacts the growth and yield of forage grasses, particularly its effect on Dactylis glomerata photosynthetic apparatus during the initial phase of development remains largely unknown. This study investigated the effects of drought on physiological parameters of various D. glomerata varieties. The seedlings obtained after seed germination under optimal and simulated drought conditions by PEG 6000 (three variants) were planted in small pots filled with garden substrate. Over a span of 42 days, the plants were initially kept well-watered (70% capillary water capacity, CWC), after which half of the seedlings from each variant were subjected to drought. This drought stress was applied during the tillering phase for 12 days. Subsequently, the plants were rehydrated (at 70% CWC) and allowed to recover for 14 days. Throughout both drought and recovery periods, measurements were taken. Leaf chlorophyll fluorescence parameters were assessed, and the JIP-test analysis was utilised to provide detailed insights into the functionality of D. glomerata photosynthetic apparatus under drought stress and post-recovery conditions. Several parameters were identified as indicative of the plants’ sensitivity to drought, such as performance indices PIABS and PItot, along with quantum yield parameters ΨEo, φEo, and φPo. The results highlighted that var. Minora and Tukan exhibited greater tolerance to water deficit when compared to the other varieties studied. They showed a large increases in PIABS and PItot values after drought stress as well as after the re-watering (recovery period) compared to control plants. This suggests their potential for better adaptation to drought conditions.
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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