Wyniki wyszukiwania

1

Implication of stem structures for photosynthetic functions in select herbaceous plants

100%

Kocurek M., Pilarski

Polish Journal of Environmental Studies

|

2012

|

tom 21

|

nr 6

For our investigation two species of herbaceous plants were selected with different morphological and anatomical stem structures: Japanese knotweed and topinambur. The distribution of chlorophyll (chl) in photosynthetically active tissues, divided into younger and older parts of stems, was studied by the use of the chl autofluorescence phenomenon. The content of chl in the stems of the topinambur was lower than in leaves by ca. 40-50%. In the J. knotweed, the quantity of chl was lower by ca. 70% in the young fragments of stems than in leaves, whereas in the older parts it approached the levels found in leaves. The chl a/b ratio was generally higher in leaves compared with stems. It was also found that the maximal efficiency of PSII (Fv/Fm) did not differ greatly between leaves and stems in these two plant species. Despite this, the maximal net photosynthetic rates (PN) in the stems of both species were low and kept to level of 0-0.5 μmol·m⁻²·s⁻¹. Much higher levels of PN were noted in the leaves of J. knotweed at ca. 10 and ca. 14 μmol·m⁻²·s⁻¹ in the topinambur. The stems of herbaceous plants are characterized by high resistance of the epidermis, although they do not have a cork limiting light and transpiration. As a result, similar to lignified, the stems of herbaceus plants use mainly internal CO₂ from respiration in the process of photosynthesis.

2

Dystrybucja promieniowania w liściach i pędach roślin zdrewniałych i zielnych

100%

Kocurek M., Pilarski J.

Pamiętnik Puławski

|

2007

|

tom 144

3

Extreme conditions for proceeding photosynthesis in stem of herbaceous plants

100%

Kocurek M., Pilarski J.

Acta Physiologiae Plantarum

|

2007

|

tom 29

|

nr 1 Suppl.

4

The content of photosynthetic pigments and the light conditions in the fruits and leaves of sweet pepper

100%

Pilarski J., Kocurek M.

Acta Physiologiae Plantarum

|

2005

|

tom 27

|

nr 2

Investigations were carried out on the fruits of sweet pepper at its two development stages: on green fruits, on mature red and yellow fruits and on leaves. The content of the photosynthetic pigments and the optical properties were examined. In the green fruits when compared with leaves the content of the photosynthetic pigments is smaller by 40 to 50 % and the value of the ratio: chlorophyll a/b is lower. Chlorophyll is absent in mature fruits, while the content of carotenoids is a few times higher. The optical properties of green fruits and of the leaves in the PAR (photosynthetically active radiation) range are the same. In the range 700 - 1100 nm the green fruits show smaller reflectance and transmittance and a few times greater absorp- tance of irradiation which contributes to the warming up of the seed bag, while small absorptance of leaves in this range protects them against overheating. In mature fruits, in the PAR range, the reflectance and transmittance are higher, while the absorptance of irradiation in comparison with that of green fruits is smaller. In the range 700 - 1100 nm the changes are rather small and refer to the increase of reflectance and reduction of absorptance, while the transmittance of irradiation remains unchanged.

5

Corticular photosynthesis of the herbaceous plants: Japanese knotweed [Reynoutria japonica] and topinambur [Helianthus tuberosus]

100%

Kocurek M., Pilarski J.

Biological Letters

|

2005

|

tom 42

|

nr 2 Spec.Vol.

81%

Ciesla S., Kocurek M., Kulinski W.

Chrońmy Przyrodę Ojczystą

|

1997

|

tom 53

|

nr 2

100

13

Daily and seasonal changes of the gas composition within sweet peppers

81%

Kocurek M., Kolton A., Pilarski J., Rozek S.

Acta Societatis Botanicorum Poloniae

|

2010

|

tom 79

|

nr Suppl.1

14

Optical properties of the cork of stems and trunks of beech [Fagus sylvatica L.]

81%

Pilarski J., Tokarz K., Kocurek M.

Polish Journal of Environmental Studies

|

2008

|

tom 17

|

nr 5

773-779

The investigations were carried out on 1-3- and 10-year-old stems and on the trunks of beech. The optical properties measured were: reflectance, absorption and transmittance of irradiation. The reflectance was measured in the bark and the cork, while absorption and transmittance were measured on isolated cork. Reflectance was measured only on the bark of trunks and the range of the investigations was 400-1100 nm. The reflectance of irradiation in the stems increased with increasing wavelength and decreased with the age of stems. In the range 400-700 nm it ranged from 18% in 1-year-old stems to 10% in 10-year-old stems, and reflectance in the trunks was equal to 15%. In the range 700-1100 nm, it ranged from 51% in 1-year-old stems to 36% in 10-year-old stems and in the trunks. Absorption of the cork decreased with increasing wavelength from about 92% in the range 400 nm to about 15% in the range 700 nm, and to 15% in the range 1100 nm. Any distinct influence of stems age on cork absorption was not observed. Transmittance of irradiation increased with increasing wavelength and the age of the stems. In the range 400 nm it was >1% in all age groups of the stems. In the range 700 nm in 1- and 2-year-old stems, it was equal to approximately 45%, and in the 10-year-old ones it amounted to 60%. In the range 700-750 nm, transmittance decreased to about 38% in the bark of 1-3-year-old stems, to 50% in 10-year-old ones and it remained at this level up to 1100 nm.

15

Wpływ nadmiernego oświetlenia na zawartości CO2 i O2 w kanałach rdzeniowych rdestowca ostrokończystego (Reynoutria japonica HOUTT.)

81%

Kocurek M., Tokarz K., Pilarski J.

Zeszyty Problemowe Postępów Nauk Rolniczych

|

2010

|

tom 545

Do doświadczeń wybrano rdestowca ostrokończystego (Reynoutria japonica Houtt.) którego łodygi posiadają obszerne kanały rdzeniowe. Rośliny uprawiane były w warunkach naturalnych. W warunkach naturalnych łodygi rdestowca są ocienione przez liście i rzadko są narażone na bezpośrednie oświetlenie promieniowaniem słonecznym. Badania wykazały, że w kanałach rdzeniowych rdestowa w ciągu nocy stężenie CO2 może przekraczać 10%, a ciągu dnia następuje zmniejszanie tego stężenia nawet poniżej 1%. Zmianom stężenia zawartości CO2 towarzyszą podobne wielkością lecz przeciwnie skierowane zmiany zawartości O2: zmniejszanie się jego zawartości w nocy i zwiększanie w ciągu dnia. Wprowadzenie nadmiernego oświetlenia łodyg doprowadziło do zmian zawartości CO2 i O2. Ze wzrostem intensywności oświetlenia szybciej malała zawartość CO2 i szybciej wzrastała zawartość tlenu w kanałach rdzeniowych. Zmiana warunków świetlnych ułatwiała reasymilację CO2 zgromadzonego w godzinach nocnych przez łodygę. W ciemności uwalnianie tego gazu w kanałach rdzeniowych wynosi około 0,6 µmol CO2·m-2·s-1, a świetlny punkt kompensacyjny reasymilacji uzyskiwano w intensywności napromieniowania około 80 µmol·m-2·s-1. Natomiast świetlne wysycenie reasymilacji notowano przy napromieniowaniu około 850 µmol·m-2·s-1 z intensywnością reasymilacji wynoszącą około 0,9 µmol CO2·m-2·s-1. Badania wykazały że nienaturalnie wysokie dawki promieniowania nie są czynnikiem stresowym dla łodyg rdestowca a wręcz przyczyniają się do szybszego zużywania CO2 i nagromadzania O2.

16

Funkcjonowanie fotosyntezy w lodygach i jej znaczenie dla bilansu weglowego rosliny

81%

Kocurek M., Tokarz K., Pilarski J.

Wiadomości Botaniczne

|

2009

|

tom 53

|

nr 1-2

7-20

17

40 lat rezerwatu Lezczok

80%

Kocurek M.

Przyroda Górnego Śląska

|

1997

|

nr 09

18

Leaf optical properties during and after drought stress in triticale and maize genotypes differing in drought tolerance

71%

Grzesiak M. T., Filek W., Hura T., Kocurek M., Pilarski J.

Acta Physiologiae Plantarum

|

2010

|

tom 32

|

nr 3

The effect of a short (7 days) and prolonged (14 days) soil drought (D) on leaf optical properties (R reflectance, T transmittance and A absorbance) in PAR and NIR range of irradiation, and on changes in leaf water potential (ψ), leaf injury index (LI), leaf thickness (LT) and chlorophyll (a + b) content (Chl) was studied for maize and triticale genotypes differing in drought tolerance. Under control conditions (C) leaves of maize in comparison to triticale were better hydrated, were thicker and had higher content of chlorophyll (a + b). In non-stressed plants, small differences were observed in measurements of R, T and A. In the range from 500 to 600 nm, the differences between D-resistant and D-sensitive were observed only in transmittance (T) and in range from 700 to 1,100 nm in absorbance (A). In genotypes belonging to the group of D-sensitive T in PAR range and A in NIR range were two times higher than in D-resistant ones. However, in NIR range R for D-sensitive genotypes was lower than for D-resistant ones. The drought stress caused the decrease in ψ, Chl, LT and the increase in leaf injury index (LI). Soil drought applied within 14 days caused larger changes in these physiological characters in comparison to 7 days drought. The observed harmful influence of drought was more visible for maize than triticale. Moreover for genotypes belonging to D-sensitive ones, changes were larger than for D-resistant ones. Similar to changes in ψ, LT and LI drought stress caused changes in leaf optical properties parameters R, A and T. In the PAR range, the highest changes were observed in R, whereas changes in T and A, which were not considerable. Both in maize and triticale, increase in R was higher in plants subjected to 14 days drought than in plants exposed to drought for 7 days. In maize, increase in R was larger for D-sensitive genotype. For both species, changes in T and A of PAR range were small. In NIR range, an increase in R and A, and decrease in T were observed. After 7 days of recovery in plants subjected to shorter period of drought significant differences were still visible in most cases. The same was observed for ψ, LT, LI and Chl parameters. It shows that the period of 7 days rehydration is too short to remove the injuries caused by drought stress. This results indicate that measurements of R, T and A might be useful in practical application for the estimation of the drought tolerance level. Some limitations in the practical application for plant breeding may be caused by relatively high cost of necessary equipment.

19

Green light induces shade avoidance syndrome in tomato plants grown under light emitting diodes (LEDs)

61%

Trojak M., Skowron E., Sobala T., Kocurek M., Palyga J., Podlaski R.

Acta Physiologiae Plantarum

|

2018

|

tom 40

|

nr 11-11th International Conference Plant Functioning under Environmental Stress...

20

Artykuł dostępny w postaci pełnego tekstu - kliknij by otworzyć plik

Response of Polish cultivars of soybean (Glycine max (L.) Merr.) to brassinosteroid application

61%

Janeczko A., Biesaga-Koscielniak J., Dziurka M., Oklestkova J., Kocurek M., Szarek-Lukaszewska G., Janeczko Z.

Acta Scientiarum Polonorum. Agricultura

|

2011

|

tom 10

|

nr 2

In the present study, we evaluated the effects of exogenously applied 24- -epibrassinolide – one of the brassinosteroids – on the seed yield, seed chemical composition (content of soluble proteins, phytoestrogens, carbohydrates, minerals) and resistance to drought of soybean cultivated in Poland (cv. Aldana and Augusta). Quantitative and qualitative analysis of brassinosteroid content was made in seeds of plants treated with 24-epibrassinolide. Experiments were performed in the field and in greenhouse. Brassinosteroid was applied via presowing seed soaking (0,25 mg·dm-3) and spraying of plants (1 mg·dm-3). 24-epibrassinolide affected the increase of the weight of seeds per one plant (27-73%) depending on the cultivar as well as growth conditions (occurrence or lack of drought factor at the stage of seed setting). In the seeds, 24- -epibrassinolide did not change content of proteins or soluble carbohydrates, but increased phytoestrogen genistein content in cultivar Aldana and decreased level of potassium in cultivar Augusta and calcium level in cultivar Aldana. In soybean seeds, the presence of brassinolide and castasterone was found. 24-epibrassinolide applied exogenously to plants was not accumulated in newly formed seeds. In drought-stressed soybean brassinosteroid showed protective effect on net photosynthesis and photosystem II efficiency.

Ograniczanie wyników

Implication of stem structures for photosynthetic functions in select herbaceous plants

Dystrybucja promieniowania w liściach i pędach roślin zdrewniałych i zielnych

Extreme conditions for proceeding photosynthesis in stem of herbaceous plants

The content of photosynthetic pigments and the light conditions in the fruits and leaves of sweet pepper

Corticular photosynthesis of the herbaceous plants: Japanese knotweed [Reynoutria japonica] and topinambur [Helianthus tuberosus]

The content of photosynthetic pigments and the light condition in the fruit and leaves of sweet pepper

Influence of the outer extermal layer on the photosynthetic apparatus location and activity

Photosynthetic pigments in the stems and leaves of the herbaceous plnts Reynoutria japonica and Hellanthus tuberosus

Comparison of photosynthetic pigment contents in stems and leaves of fruit trees: cherry, sweet cherry, common plum, and walnut tree

Distribution of photosynthetic pigments in the stems of the herbaceous and the lignified plants

Daily changes of CO2 and O2 concentrations in the pith cavity of the Japanese knotweed

Nietypowe miejsce koczowania bielika Haliaeetus albicilla

Daily and seasonal changes of the gas composition within sweet peppers

Optical properties of the cork of stems and trunks of beech [Fagus sylvatica L.]

Wpływ nadmiernego oświetlenia na zawartości CO2 i O2 w kanałach rdzeniowych rdestowca ostrokończystego (Reynoutria japonica HOUTT.)

Funkcjonowanie fotosyntezy w lodygach i jej znaczenie dla bilansu weglowego rosliny

40 lat rezerwatu Lezczok

Leaf optical properties during and after drought stress in triticale and maize genotypes differing in drought tolerance

Green light induces shade avoidance syndrome in tomato plants grown under light emitting diodes (LEDs)

Response of Polish cultivars of soybean (Glycine max (L.) Merr.) to brassinosteroid application