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1

Local and systemic protection of poinsettia [Euphorbia pulcherrima Willd.] against Botrytis cinerea Pers. induced by benzothiadiazole

100%
Kulek B., Floryszak-Wieczorek J.
Acta Physiologiae Plantarum
|
2002
|
tom 24
|
nr 3
2

Effect of different soil water potential on leaf transpiration and on stomatal conductance in poinsettia

84%
Nowak J. S.
Acta Agrobotanica
|
2002
|
tom 55
|
nr 2
Euphorbia pulcherrima Wild. 'Lilo' was grown in containers in 60% peat, 30% perlite and 10% clay (v/v) mixture, with different irrigation treatments based on soil water potential. Plants were watered at two levels of drought stress: -50 kPa or wilting. The treatments were applied at different stages of plant development for a month or soil was brought to the moisture stress only twice. Additionally, some plants were watered at -50 kPa during the entire cultivation period while the control plants were watered at -5 kPa. Plants were also kept at maximum possible moisture level (watering at -0.5 kPa) or c10se to it (-1.0 kPa) through the entire growing period. Soil water potential was measured with tensiometer. Drought stress applied during entire cultivation period or during the flushing stage caused significant reduction in transpiration and conductance of leaves. Stress applied during bract coloration stage had not as great effect on the stomatal conductance and transpiration of leaves as the similar stress applied during the flushing stage. High soil moisture increased stomatal conductance and transpiration rate, respective11y by 130% and 52% (flushing stage), and 72% and 150% (bract coloration stage) at maximum, compared to the control.
3

Beta-D-glucosidase activity in pelargonium and poinsettia leaves infected by Botrytis cinerea Pers. ex Fr.

84%
Kulek B., Floryszak-Wieczorek J., Jackowiak H.
Acta Physiologiae Plantarum
|
2004
|
tom 26
|
nr 1
4

Fuzaryjna zgnilizna - nowa choroba poinsecji w Polsce

59%
Orlikowski L. B., Skrzypczak C., Valiuskaite A., Sroczynski M.
Progress in Plant Protection
|
2007
|
tom 47
|
nr 2
212-215
5
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Rozwoj Botrytis cinerea Pers. ex Fr. na lisciach wilczomlecza pieknego [Euphorbia pulcherrima Willd.]

51%
Kulek B., Floryszak-Wieczorek J.
Acta Agrobotanica
|
2005
|
tom 58
|
nr 2
225-236
The development of Botrytis cinerea was assessed on six cultivars of common poinsettia, differing in the colour of bracts, and being in great demand among buyers of these ornamental plants. Resistance to this pathogen differed in the investigated poinsettias. Cultivar ‘Malibu Red’ (red bracts) turned out to be most susceptible, while cv. ‘Marblestar’ (cream-pink) and cv. ‘Coco White’ (white) - relatively resistant to this fungus. After application of various inoculation methods (leaf discs, cut off leaves, whole plants) the differences in resistance to B. cinerea were confirmed for two extreme cultivars - susceptible (‘Malibu Red’) and resistant (‘Coco White’), which indicated genetic background of this polymorphism. The rate of disease development on poinsettia leaves was affected by the amount of spores used for inoculation (optimum density of 3.5·10⁵ B. cinerea conidia / ml suspension) and the addition of stimulants (0.1 M glucose with 0.05 M KH₂ PO₄), which facilitated germination and infection of the host tissue. The inoculated poinsettia leaves showed high stability of plasma membranes. In the susceptible cultivar, in spite of the development of necrotic spots, a significant increase in the membrane damage index (by 13%) was found only on day 7 of the disease development.
6

Powstawanie wolnych rodnikow w rozwoju szarej plesni na lisciach poinsecji

51%
Kulek B., Floryszak-Wieczorek J., Gorski Z.
Acta Agrobotanica
|
2002
|
tom 55
|
nr 1
157-171
Participation of superoxide anion and hydroxyl radical as well as lipoxygenase (LOX) activity and chemiluminescence in the development of grey mould on ,poinsettia leaves of the cvs.: Coco White - moderately resistant and Malibu Red sceptible to Botryotinia fuckeliana (B. cinerea) were investigated. In both poinsettia cultivars, the level of superoxide anion radical increased with the disease, development. On later dates following inoculation, the content of O₂‧₋ in the diseasedd leaf areas of the susceptible cultivar was 2 - fold larger than in grey mould symptom areas of the moderately resistant cultivar. The postinfection generation of a strongly reactive hydroxyl radical was found in the cultivar susceptible to the pathogen. The level of ‧₋ OH in the last hours after inoculation 10 fold higher in grey mould spots than in healthy senescing leaves of that cultivar. The activity of LOX exhibited opposite tendencies of changes in the both genotypes examined after the infection. In the first hours after inoculation, the e activity was Low, whereas after 3nd day it significantly increased in diseased areas and in their surroundings. However, in the moderately resistant cultivar activity of lipoxygenase thoughout the first 3 days of the disease activity was relatively high and then decreased. Poinsettia leaves infected with B. cinerea d chemiluminescence. Kinetics and the intensity of ultraweak chemiluminescence depended on the cultivars of poinsettia and on the degree of the disease development.The postinfection increase of chemiluminescence was particularly visible in the zone surrounding diseased areas in the susceptible cultivar.
7

Kwiaty w domu

51%
Jaroszenko-Skrunda A.
Agrochemia
|
1998
|
nr 12
8

Wplyw syntetycznych induktorow odpornosci nabytej na hamowanie rozwoju szarej plesni u pelargonii i poinsecji

51%
Floryszak-Wieczorek J., Kulek B.
Acta Agrobotanica
|
2002
|
tom 55
|
nr 1
69-78
Several chemical activators of resistance were tested to evaluate their efficiency in restricting development caused by Botryotinia fuckeliana (Botrytis cinerea) on geranium and poinsettia leaves. The used signal pathway inducers of salicylic acid, such as DL-a-aminobutyric aeid (BABA), g-aminobutyric acid (GABA) and benzothiadiazole (BTH), at the applied rates markedly inhibited the development of grey mould in the both plant species. The mentioned inducers showed no toxic or restricting effect on the fungus growth and development under in vitro conditions. Only methyl jasmonate (Me-JA), a potential activator of independent signal transduction pathway, at the applied quantities (0.1-1.0 mg‧ml-1), noticeably enhanced the disease spot development probably through stimulation of ethylene synthesis in plant Me-JA added to medium with B. cinerea showed a strong antifungal action, whereas ethylene significantly stimulated mycelium growth in the in vitro cultures.
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