Professor Peter F. Milovidov

K. Beneš

Biologia plantarum 17:241-242, 1975 | DOI: 10.1007/BF02921213

Über den Stoffwechsel der freien Zucker in mit Kartoffelvirus Y infizierten Tabakpflanzen

L. Šindelář

Biologia plantarum 17:243-250, 1975 | DOI: 10.1007/BF02921214

The results presented in this paper indicate an immediate relation between the increased activity of the pentosephosphate cycle and the biosynthesis of the virus. In the period of its maximal reproduction (4 to 8 days after inoculation) also pentosephosphate cycle activity is enhanced what enables an increased biosynthesis of both purine and pyrimidine nucleotides which are necessary for the formation of the viral RNA. As soon as the period of the maximal reproduction of the virus ends, the activity of the pentosephosphate cycle drops deeply under the value of the control. The lowered intensity of respiration at the period of intense reproduction of...

Respirationsveränderungen inN. tabacum-Blättern bei Lokal- und Systeminfektion durch den Virus der Kartoffelstrichelkrankheit

Olga Makovcová, L. Šindelář

Biologia plantarum 17:251-255, 1975 | DOI: 10.1007/BF02921215

In comparison with controls, the respiratory activity in locally infected leaves was lower until the 8th day after inoculation, whereas it was higher with the leaves in which systemic infection was expected. In the course of the remaining period of investigation, the respiratory activity was almost identical in both cases, showing a rising tendency. Ascorbic acid oxidase whose activity curves correspond to those of respiration, represents the main terminal oxidase. Its activity is probably coupled to the respiratory chain in which glutathione, reduced by NADPH, is capable of reducing reversely dehydroascorbic acid originating from the action of ascorbic...

The effect of gametocides on microsporogenesis of winter rye

Zdeňka Nátrová, M. Hlaváč

Biologia plantarum 17:256-262, 1975 | DOI: 10.1007/BF02921216

The effect of gametocides FW-450, maleic hydrazide and Dalapone on the course of microsporogenesis, gametogenesis and starch synthesis in pollen grains of winter rye ev. 'Esto' was investigated. Solutions containing various concentrations of tested substances were applied on leaves in amount of 2.5 ml and 5.0 ml per plant at the beginning, at the full and at the end of shooting. The effect of gametocides was detectable already in the phase of microspore formation when a decrease of anther weight, pollen grain size and starch content in grains and an increase of the number of microspores with nonfinished development were observed. The manner and the...

Transversale anatomische Gradienten in der Kartoffelknolle

J. Pazourek

Biologia plantarum 17:263-267, 1975 | DOI: 10.1007/BF02921217

Various quantitative anatomical characteristics were measured in the potato tuber by the using of integration methods. There were found the gradients showing the dependence of the changes on the distance from the surface of the tuber.

Jacob, H.: Untersuchungen zur Thermotherapie von Steinobstvirosen. (Investigations on Heat Therapy of Stone Fruit Virus Diseases). Acta phytomedica (Suppl. J. Phytopathol.) 2

J. Brčák

Biologia plantarum 17:267, 1975 | DOI: 10.1007/BF02921218

Investigation of the properties of alcohol dehydrogenase from bean, rape, wheat and broad bean

Sylva Leblová, Marie Stiborová

Biologia plantarum 17:268-275, 1975 | DOI: 10.1007/BF02921219

Preparations of alcohol dehydrogenase (ADH) were prepared from germinating seeds by a procedure including fractionation with ammonium sulphate, desalting on a column of Sephadex G-25 and chromatography on DEAE-cellulose, the specific activity of ADH was in the case ofPhaseolus 31 times,Brassica 43 times,Triticum 47 times, andVicia 212 times higher than that of crude extract. The enzymes were homogeneous when filtrated on Sephadex G-200. Molecular weight of all the four studied ADH was approximately 63 000. Some kinetic properties as K_m for ethanol as substrate, substrate specificity towards different alcohols,...

The possibility of obtaining seeds following placental pollination in vitro

Miluše Zůbková, Z. Sladký

Biologia plantarum 17:276-280, 1975 | DOI: 10.1007/BF02921220

The paper aims at verifying the possibility of obtaining seeds following placental pollination in more than 20 species of dicotyledons and monocotyledons. Excised placentae with ovules were cultivated in solid nutrient media in Petri dishes. Pollen was transferred from anthers onto placentae, its germinating capacity being enhanced by a drop of a 5 per cent sucrose in boric acid in certain cases. Fertilization of ovules resulting in the formation of viable seeds was obtained withNicotiana tabacum, Melandrium album andAgrostemma githago. Although withPaeonia officinalis, Viola tricolor, Antirrhinum majus, Galanthus nivalis, Narcissus...

The effect of certain pre-sowing seed treatments and early phosphorus supplement on cell sap concentration and water fractions in leaves of maize (Zea mays L.) plants grown under soil moisture stress conditions

M. T. El-Saidi, A. I. Gabr, M. El-Kadi, H. A. El-Zeiny

Biologia plantarum 17:281-291, 1975 | DOI: 10.1007/BF02921221

The exposure of maize plants to drought led in most cases to a decrease in both the total and free water percentages, but to an increase in cell sap concentration, bound water percentage and bound water/free water ratio, comparing with the case of normal water supply. The employment of any of the studied treatments at either the normal or low soil moisture levels led throughout the period of time preceding the milky stage to a decrease in the free water percentage in maize leaves, but to the reverse effect with respect to both the bound water percentage and the bound water/free water ratio. The determinations of water fractions in leaves (free, bound...

Action of growth regulators on the cotyledonary stomata ofCucumis sativus L.: Structure and ontogeny

M. Gangadhara, J. A. Inamdar

Biologia plantarum 17:292-303, 1975 | DOI: 10.1007/BF02921223

Anomocytic stomata and stomata with single subsidiary cells are commonly observed Sometimes a stoma appears anisocytic. Double cytoplasmic connections between nearby stomata and division of guard cells with persistent or degenerating nuclei are seen in GA. One or more divisions of guard cells, displaced guard cells and single guard cells with or without pore are noticed in SUC. Formation of single guard cells is a common feature in TIBA. Paracytic stomata, one and a half stomata and persistent stomatal initials are seen in SUL. COUM seems to be not inhibitory inCucumis sativus. In COL stomata with unequal guard cells, unequal stomatal cells...

The occurrence of beet mild yellowing virus in Czechoslovakia

J. Polák, J. Chod

Biologia plantarum 17:304-308, 1975 | DOI: 10.1007/BF02921225

The occurrence of beet mild yellowing virus (BMYV) on feeding- and sugar-beet in Czechoslovakia has been proved. The virus was transmitted by aphidMyzus persicae (Sulz.) on indicator plantsSinapis alba L.,Capsella bursa-pastorisMedik, andClaytonia perfoliataDonn and from these plants back to sugar-beet cv. 'Dobrovická A.' A weed plantRaphanus raphanistrum L. was identified as a new natural host plant of BMYV. The virus was identified in ten of twelve biologically examined samples of beet with BMYV-like symptoms, which were collected at various places in Czechoslovakia

Book reviews

Z. Šesták

Biologia plantarum 17:320, 1975 | DOI: 10.1007/BF02921231

Comparison between wheat embryos isolated mechanically and by floating off from organic solvents

H. Kern

Biologia plantarum 17:309-313, 1975 | DOI: 10.1007/BF02921226

Wheat embryos floated off from organic solvents have been compared with mechanically isolated embryos. The results of comparative investigations, including germination,in vivo formation of polysomes and efficiency of cell free preparations forin vitro protein synthesis, favour the use of floated embryos for studies of biochemical processes during germination.

Specific leaf weight and photosynthetic rate in sugar beet leaves of different age

Danuše Hodáňová

Biologia plantarum 17:314-317, 1975 | DOI: 10.1007/BF02921228

No proportional changes in the photosynthetic rate,P, (measured as the dry weight increments in leaf discs) as related to the specific leaf weight,SLW (i.e. leaf dry weight per unit leaf area) were found because of different variation inP andSLW, respectively, with the age and insertion level of individual sugar beet leaves as well as with the age of the whole plant.

Phenolic compounds present in rice husk

K. Jayachandran-Nair, R. Sridhar

Biologia plantarum 17:318-319, 1975 | DOI: 10.1007/BF02921230

In a study on the phenolic distribution of rice husk (lemma, palea, rachilla and sterile lemmas), seven phenolic acids were detected in the alkali and alcoholie extracts. The total quantity of phenolic compounds in the husk differed with cultivars; however, no qualitative difference was noticed.

Wood, R. K. S.: Disease in higher plants.-Oxford biology readers 57

J. Brčák

Biologia plantarum 17:291, 1975 | DOI: 10.1007/BF02921222

Whittingham, C. P.: The mechanism of photosynthesis

J. Čatský

Biologia plantarum 17:303, 1975 | DOI: 10.1007/BF02921224

Semikhatova, O. A.: Energetika Dykhaniya Rasteniï pri Povyshennoï Temperature. [Energetik der Pflanzenatmung bei erhöhter Temperatur]

Ingrid Tichá

Biologia plantarum 17:313, 1975 | DOI: 10.1007/BF02921227

Brown, R. W., Van Heveren, B. P. (eds.): Psychrometry in water relations research

B. Slavík

Biologia plantarum 17:317, 1975 | DOI: 10.1007/BF02921229