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  1. 3 Ciereszko I.

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Czy można usprawnić pobieranie fosforanów przez rośliny?

100%
Ciereszko I.
Kosmos
|
2005
|
vol. 54
|
issue 4
391-400
EN
Phosphorus is an important nutrient but usually it is at low availability in the soil - thus, it can limit plant growth and agricultural production. Plants have evolved various responses to adapt to low phosphorus nutrition - which is shortly summarized in this review. for example, roots secrete organic acids and different enzymes to rhizosphere, or can induce the transport system to improve the release (from the soil) and uptake of inorganic phosphate (Pi). Plants might control Pi nutrition by induction of mycorrhizae or by developing specific root structures - proteoid roots. attempts to generate plants which may more efficiently acquire Pi from the soil have recently been made by several scientific groups. the usefulness of such transgenic plants, with improved Pi uptake and enhanced Pi mobilization, and possible application of these plants in agriculture are discussed.
2
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Kontrola metabolizmu sacharozy u roślin w odpowiedzi na zmienne warunki środowiska

100%
Ciereszko I.
Kosmos
|
2006
|
vol. 55
|
issue 2-3
229-241
EN
Sucrose is a final product of photosynthesis; it is transported to the sink organs of a plant where it is used as substrate, metabolized to other organic compounds or stored. Besides, sucrose has a nonnutritive role — controlling plant growth, development and regulation of cell metabolism. This review summarizes information on the key enzymes of sucrose synthesis and breakdown, and regulations of their activity (transcriptional, translational control or posttranslational modifications) under unfavourable conditions. Changes of carbohydrate concentration in tissues have been frequently shown to be involved in plant responses to different stresses. Changes in sugar content influence the expression of various genes via a variety of signal transduction pathways. The regulatory role of sucrose, e.g. control of its own metabolism, and possible interactions of sugarresponse pathways with other signalling events are discussed.
3
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Fluorescencja chlorofilu a - historia odkrycia i zastosowanie w badaniach roślin

63%
Sulkiewicz M., Ciereszko I.
Kosmos
|
2016
|
vol. 65
|
issue 1
103-115
PL
Fluorescencja chlorofilu a jest czułą, nieinwazyjną i szybką metodą pomiaru wydajności fotosystemu II (PSII). Artykuł przedstawia wprowadzenie teoretyczne, historię odkrycia fenomenu, opis najczęściej używanych technik oraz praktyczne zastosowanie pomiarów fluorescencji chlorofilu a w badaniach. Scharakteryzowano trzy główne metody pomiaru fluorescencji chlorofilu a tj. szybką, modulowaną oraz jej obrazowanie. Analiza parametrów fotoluminescencji chlorofilu a dostarcza wielu informacji o funkcjonowaniu PSII roślin rosnących w warunkach stresu abiotycznego i biotycznego, jest powszechnie wykorzystywana przez fizjologów roślin oraz ekofizjologów. Przedstawiono najnowsze wyniki badań wpływu wybranych niekorzystnych warunków środowiska (promieniowanie świetlne, wysoka temperatura, przechłodzenie, susza, zalanie, uszkodzenie mechaniczne) na zmiany parametrów fluorescencji chlorofilu a. Artykuł jest wprowadzeniem do tematyki pomiarów fluorescencji chlorofilu a i jest przeznaczony dla osób zainteresowanych wykorzystaniem jej w swoich badaniach.
EN
Chlorophyll a fluorescence is a sensitive, non-invasive fast tool for measuring photosynthetic efficiency mainly of photosystem II (PSII). We present description of basic photoluminescence mechanism, history of chlorophyll fluorescence discovery and review of main chlorophyll fluorescence measurement techniques with practical issue. In this article, we focus on methods of a fast chlorophyll fluorescence, pulse-amplitude modulated chlorophyll fluorescence and chlorophyll fluorescence imaging technique. Described techniques are powerful and widely use tools, available for plant physiologists and ecophysiologists. Analysis of the chlorophyll fluorescence parameters, which are good indicators or biomarkers of plant tolerance, provides many information about efficiency of PSII during abiotic and biotic stress. We describe how environmental stress conditions (irradiance, heat, cold, drought, flood and mechanical wounding) influence to most popular chlorophyll a fluorescence parameters and how to interpret them. The aim of this review is to provide a simple, practical guide to chlorophyll fluorescence for beginners.
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