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    Wyświetlanie 1-6 z 6
    Tytuł:
    Evaluation of canola chlorophyll index and leaf nitrogen under wide range of soil moisture
    Autorzy:
    Meskini-Vishkaee, F.
    Mohammadi, M.H.
    Neyshabouri, M.R.
    Shekari, F.
    Powiązania:
    https://bibliotekanauki.pl/articles/25557.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Instytut Agrofizyki PAN
    Tematy:
    canola
    chlorophyll level
    leaf
    nitrogen
    soil moisture
    plant stress
    environmental stress
    Opis:
    The paper presents a study on the effect of soil matric suction on the variation of leaf chlorophyll index and nitrogen concentration of canola. Results showed that chlorophyll index increases exponentially with soil matric suction, especially at the late season of canola growing time. At moderate matric suction (200 and 300 kPa soil suction heads), chlorophyll index remains nearly constant, but in drier soil (matric suction >300 kPa),chlorophyll index increases gradually with time. Despite the va-riation of the total leaf nitrogen with the soil matric suction, it is similar to the variation of the chlorophyll index, but the results showed that the chlorophyll index – nitrogen concentration curve has a de-marcated bi-modal shape. We suggest that 2.7% of nitrogen and 69.8 of the chlorophyll index value represent the upper limit of the chlorophyll meter reliability for estimation of canola nitrogen under a wide range of soil moisture levels. These results confirm that the chlorophyll meter can be used as an effective tool for rapid and non-destructive estimation of the relative chlorophyll and nitrogen content in canola leaves at a wide range of soil moisture content, except for nearly wilting coefficient or extremely high drought stress.
    Źródło:
    International Agrophysics; 2015, 29, 1
    0236-8722
    Pojawia się w:
    International Agrophysics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The GUN4 protein plays a regulatory role in tetrapyrrole biosynthesis pathway and is required for chloroplast-to-nucleus signalling in unicellular green algae Chlamydomonas reinhardtii
    Autorzy:
    Brzezowski, P.
    Grimm, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/81179.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    conference
    aerobic organism
    GUN4 protein
    tetrapyrrole biosynthesis
    chloroplast
    unicellular green alga
    Chlamydomonas reinhardtii
    5-aminolevulinic acid
    gene expression
    chlorophyll level
    light condition
    Źródło:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 3
    0860-7796
    Pojawia się w:
    BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The response of maize seedlings to salt stress under increasing levels of phosphorus
    Autorzy:
    Sacala, E.
    Demczuk, A.
    Grzys, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/1189785.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    plant response
    seedling
    maize
    salt stress
    phosphorus level
    salinity
    carbohydrate
    protein
    chlorophyll
    carotenoid
    Opis:
    This study was conducted to evaluate the combined effect of increasing doses of phosphate and moderate salinity on the growth and some biochemical parameters of maize seedlings. The experiments were carried out on the maize variety KB 1902 grown in hydroponic cultures under controlled conditions. Salt stress was induced by 50 mmol dm-3 NaCl at three levels of KH2PO4 (in mmol dm-3): 1.0 (standard dose in a nutrient solution), 0.25 (decreased dose), 2.0 (increased dose). After 7 days of cultivation, the plants were harvested, growth parameters were examined and assessments were made of the concentrations of photosynthetic pigments, total protein, soluble carbohydrates and free phosphate. Salt stress caused a significant reduction in the fresh and dry weight of plants, ranging from 33-45% in comparison to the plants grown without NaCl, irrespective of external phosphate concentrations. Concentrations of photosynthetic pigments and total proteins were unaffected by salinity, regardless of the external phosphorus levels. The two higher concentrations of Pi (1.0 and 2.0 mmol dm-3) in the saline nutrient medium resulted in a marked accumulation of phosphorus in the leaves of maize, whereas the lowest level of Pi (1/4 of the standard dose in the nutrient solution) had no effect on the phosphorus content. Both the increased (2 P) and decreased (1/4 P) phosphorus concentration in the external medium induced a significant increase in the content of soluble carbohydrates in the leaves of maize grown under salt stress. In brief, the response of the maize variety KB 1902 to NaCl stress at the initial stage of growth was not found to have been modified by the examined doses of phosphorus, and there was no relationship between NaCl and the increasing doses of phosphate.
    Źródło:
    Journal of Elementology; 2016, 21, 1; 185-194
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The response of maize seedlings to salt stress under increasing levels of phosphorus
    Autorzy:
    Sacala, E.
    Demczuk, A.
    Grzys, E.
    Powiązania:
    https://bibliotekanauki.pl/articles/15037.pdf
    Data publikacji:
    2016
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Tematy:
    plant response
    seedling
    maize
    salt stress
    phosphorus level
    salinity
    carbohydrate
    protein
    chlorophyll
    carotenoid
    Opis:
    This study was conducted to evaluate the combined effect of increasing doses of phosphate and moderate salinity on the growth and some biochemical parameters of maize seedlings. The experiments were carried out on the maize variety KB 1902 grown in hydroponic cultures under controlled conditions. Salt stress was induced by 50 mmol dm-3 NaCl at three levels of KH2PO4 (in mmol dm-3): 1.0 (standard dose in a nutrient solution), 0.25 (decreased dose), 2.0 (increased dose). After 7 days of cultivation, the plants were harvested, growth parameters were examined and assessments were made of the concentrations of photosynthetic pigments, total protein, soluble carbohydrates and free phosphate. Salt stress caused a significant reduction in the fresh and dry weight of plants, ranging from 33-45% in comparison to the plants grown without NaCl, irrespective of external phosphate concentrations. Concentrations of photosynthetic pigments and total proteins were unaffected by salinity, regardless of the external phosphorus levels. The two higher concentrations of Pi (1.0 and 2.0 mmol dm-3) in the saline nutrient medium resulted in a marked accumulation of phosphorus in the leaves of maize, whereas the lowest level of Pi (1/4 of the standard dose in the nutrient solution) had no effect on the phosphorus content. Both the increased (2 P) and decreased (1/4 P) phosphorus concentration in the external medium induced a significant increase in the content of soluble carbohydrates in the leaves of maize grown under salt stress. In brief, the response of the maize variety KB 1902 to NaCl stress at the initial stage of growth was not found to have been modified by the examined doses of phosphorus, and there was no relationship between NaCl and the increasing doses of phosphate.
    Źródło:
    Journal of Elementology; 2016, 21, 1
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of alpha-aminooxyacetic acid on the level of polyamines, anthocyanins and photosynthetic pigments in seedlings of common buckwheat (Fagopyrum esculentum Moench)
    Autorzy:
    Horbowicz, M.
    Kosson, R.
    Koczkodaj, D.
    Lahuta, L.
    Powiązania:
    https://bibliotekanauki.pl/articles/57385.pdf
    Data publikacji:
    2011
    Wydawca:
    Polskie Towarzystwo Botaniczne
    Tematy:
    aminooxyacetic acid
    Fagopyrum esculentum
    alpha-aminooxyacetic acid
    anthocyanin
    photosynthetic pigment
    polyamine level
    seedling
    chlorophyll
    buckwheat
    putrescine
    spermidine
    Opis:
    The present paper discusses the effects of α-aminooxyacetic acid (AOA) on contents of polyamines, anthocyanins, photosynthetic pigments and phenylalanine ammonia-lyase activity in seedlings of common buckwheat (Fagopyrum esculentum Moench). AOA clearly decreased light-induced formation of anthocyanins and inhibited PAL activity in buckwheat hypocotyls, although a slight stimulatory effect on anthocyanins content in buckwheat cotyledons was observed. AOA declined the contents of chlorophylls a and b, and total carotenoids in buckwheat cotyledons. The results show that AOA inhibits phenylpropanoids biosynthesis in buckwheat hypocotyls, and suppress photosynthesis in cotyledons. Moreover, the experiments show that AOA enhances the level of free putrescine in hypocotyls and the level of spermidine in buckwheat cotyledons. AOA also diminished the content of putrescine in cotyledons, but did not affect its level in buckwheat hypocotyls. AOA also substantially declined the level of cadaverine in buckwheat cotyledons, and did not affect its content in hypocotyls. Differences in effect of AOA on anthocyanins and polyamines accumulation indicate various physiological roles of the compounds in buckwheat hypocotyls and cotyledons.
    Źródło:
    Acta Societatis Botanicorum Poloniae; 2011, 80, 2
    0001-6977
    2083-9480
    Pojawia się w:
    Acta Societatis Botanicorum Poloniae
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Microplankton size structure induced by a warm-core eddy in the Western Bay of Bengal: Role of Trichodesmium abundance
    Autorzy:
    Chinnadurai, K.
    Retnamma, J.
    Nagarathinam, A.
    Subramanian, P.R.
    Singaram, P.
    Shoba, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/2078908.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Instytut Oceanologii PAN
    Tematy:
    microplankton
    size structure
    biomass
    Trichodesmium
    sea surface temperature
    wind
    sea level
    geostrophic current circulation
    chlorophyll a
    Bengal Bay
    Opis:
    Mesoscale warm-core eddies are common in the Bay of Bengal (BoB), and this study in the western BoB during Pre-Southwest Monsoon (April 2015) presents how a prolonged warmcore core eddy could modify the microplankton biomass and size structure. To investigate this, field sampling and laboratory analyses were augmented with satellite data sets of sea surface temperature (SST), winds, mean sea level anomaly (MSLA), geostrophic currents and chlorophyll-a. High SST with positive MSLA (≥ 20 cm) and a clockwise circulation, represented the occurrence of a large warm-core eddy in the western BoB. Time series data evidenced that it was originated in the mid of March and persistent there till early June, which in turn caused a decrease in the surface nutrients and chlorophyll-a. The abundance and biomass of microplankton were negligible in the warm-core eddy region. FlowCAM data showed a significant decrease in the autotrophic microplankton parameters in the warm-core eddy (av. 13 ± 9 ind. L−1 and 0.1 ± 0.04 μgC L−1, respectively) as compared to the surrounding locations (av. 227 ± 143 ind. L−1 and 0.8 ± 0.5 μgC L−1, respectively). Low nutrients level in the warm core eddy region favoured high abundance of needle-shaped phytoplankton cells dominated by Trichodesmium cells. As a result, the size of micro-autotrophs in the warm-core eddy was larger (av. 91,760 ± 12,902 μm3 ind.−1) than its outside (av. 50,115 ± 21,578 μm3 ind.−1). This is a deviation from our belief that the oligotrophy decreases the phytoplankton size. We showed here that the above understanding might not be infallible in warm-core eddies in the northern Indian Ocean due to its inducing effect on the Trichodesmium abundance.
    Źródło:
    Oceanologia; 2021, 63, 3; 283-300
    0078-3234
    Pojawia się w:
    Oceanologia
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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