Segregation of serological characters in the crossPhaseolus coccineus L. xPh. vulgaris L.

J. Smartt, J. Kloz, Eva Klozova

Biologia plantarum 15:369-373, 1973 | DOI: 10.1007/BF02922755

The segregation of a protein (designated as protein I) was studied in interspecific hybrids ofPhaseolus coccineus x Phaseolus vulgaris. A single locus difference is suggested similarly as in intraspecific hybrids.

The effect of different sowing densities and nutrient levels on leaf area index, production and distribution of dry matter in maize (zea mays l.)

J. Vidovič, V. Pokorný

Biologia plantarum 15:374-382, 1973 | DOI: 10.1007/BF02922756

The course of biological curves of accumulation of total (Y_biol), vegetative (Y_veg) and grain dry matter (Y_gr) in maize(Zea mays L.)was investigated in a field experiment. The different population densities from 27 777 to 121 418 plants per ha were tested in interaction with increasing fertilizer rates (NPK) ranging from zero to 780 kg of pure nutrients per ha. The grain yield (F_gr) plotted against the population density shows a parabolic trend with a maximum at densities from 64 000 to 79 000 plants per ha. An asymptotic trend was obtained for the curve of biological yield (F_biol) in relation...

Comparative effects of colchicine, caffeine

Satyesh Chandra Roy

Biologia plantarum 15:383-390, 1973 | DOI: 10.1007/BF02922757

The effect of colchicine, caffeine and hydroquinone on nodal meristems ofCallisia fragrans has been studied. The polyploidy have been induced following 4 and 8 hours of treatment in 0.5% colchicine. The persistence of polyploidy in emerging roots even after 60 d. of recovery in the soil indicates that the colchicine affected not only the nodal roots but also the nodal tissue of the plant. The occurence of both diploid and polyploid roots in the same node has been attributed to the differential penetration of the compound to the different zones of tissue. The increase in the division frequency following certain period of recovery was also observed....

Genetic and physiological analysis of induced late mutants ofarabidopsis thaliana (l.) heynh

Marta Větřilová

Biologia plantarum 15:391-397, 1973 | DOI: 10.1007/BF02922758

Using four independent late mutants, obtained by treatment of the early cultivar Dijon-G with N-methyl-N-nitrosourea, it was found that their delayed flowering has a monogenic genetic basis, the mutant alleles appearing to be incompletely dominant. All these mutants display a positive reaction to the graded vernalisation; the vernalisation requirement of the individual mutants is, however, both quantitatively and qualitatively different and hence specific for each of the mutant genotypes. lodoacetic acid is found to inhibit the vernalisation of the mutants to some extent only when the duration of the vernalisation is relatively short (20 days). A hypothesis...

Initiation of active metabolism in the early imbibitional phase of mungbean (phaseolus aureus) seeds

A. K. Paul, S. Mukherji

Biologia plantarum 15:398-404, 1973 | DOI: 10.1007/BF02922759

Metabolism of dry mungbean seeds(Phaseolus aureus) was compared with that of 3 h imbibed ones. Respiration rates sharply increased upon imbibition which was accompanied by large water uptake. Storage protein was degraded resulting in the rise in soluble nitrogen. RNA and water soluble protein content increased but DNA declined. It is suggested that some of the soluble nitrogen pools are diverted to RNA formation which in turn produce enzyme protein. In mungbean seeds imbibition of water thus triggers a series of metabolic changes within 3 h with the respiratory energy as the driving force.

Isolation of alcohol dehydrogenases from germinating seeds of pea, broad-bean, lentil and kidney-bean

Sylva Leblová, P. Mançal, Dana Sofrová, Jana Barthová

Biologia plantarum 15:405-411, 1973 | DOI: 10.1007/BF02922760

The maximum of alcohol dehydrogenase (ADH) activity of germinating pea and broad-bean seeds sediments from 40 to 60% ammonium sulfate saturation, from lentil and kidney-bean seeds between 40 and 50%. This operation increased the specific activity of ADH preparations roughly tenfold. Chromatography on DEAE-eellulose and gel filtration increased the activity of the resulting preparation when compared with the initial preparation 178 times with pea, 334 times with broad-bean, 122 times with lentil and 77 times with kidney-bean. The ADHs resemble each other in coenzyme specificity: the reaction rate with NAD is one hundred times greater than with NADP....

Rooting response of etiolated stem segments ofPopulus nigra to antimetabolites in relation to indole-3-acetic acid and glucose

K. K. Nanda, M. K. Jain, N. C. Bhattacharya

Biologia plantarum 15:412-418, 1973 | DOI: 10.1007/BF02922761

2.5 cm long etiolated stem segments ofPopulus nigra did not root at all in water or in IAA alone, but rooted in glucose + IAA. 5-Fluorodeoxyuridine (FUDR), 5-Fluorouracil (FU). actinomycin-D and cycloheximide all inhibited rooting, the inhibitory effect of each increasing with concentration and being more marked in glucose than in glucose + IAA. The inhibitory effect also decreased with the delay in the application of cycloheximide. The DNA, RNA and protein contents of segments grown in IAA + glucose where rooting occurred were higher than in water or in IAA + glucose + cycloheximide/or + aetinomycin-D where rooting did not occur. Auxin in the...

Nucleic acid synthesis inChenopodium rubrum L. during photoperiodic induction and its relation to endogenous rhythmicity

Lola Teltscherová, Dagmar Pleskotová

Biologia plantarum 15:419-426, 1973 | DOI: 10.1007/BF02922762

Beginning with the second inductive cycle the rate of nucleic acid (NA) synthesis in cotyledons and apical buds ofChenopodium rubrum is higher at the end of the dark period or 4h following transfer of the plants to light in induced plants than in non-induced ones. This is due to an increase in all NA fractions. The greatest difference between NA synthesis in induced and non-induced plants was observed at the end of the second (or sometimes third) inductivecycle. In the subsequent cycles the difference decreased or disappeared eventually. During photoperiodic induction NA synthesis shows a diurnal rhythm with a peak at the end of the dark and...

Book reviews

Jana Opatrná, J. Krekule, Ingrid Tichá

Biologia plantarum 15:426, 1973 | DOI: 10.1007/BF02922763

Book reviews

Ingrid Ticha, Ingrid Tichá

Biologia plantarum 15:432, 1973 | DOI: 10.1007/BF02922766

Kinetin and naphtaleneacetic acid controlled starch formation in isolated roots ofPisunt sativum

Věea Hadačová, J. Luštinec, M. Kamínek

Biologia plantarum 15:427-429, 1973 | DOI: 10.1007/BF02922764

The formation of starch in excised 3-days-old pea roots was enhanced up to three fold after cultivation for five days in liquid media containing 3% glucose, microelements, and 10^-6 M kinetin or 10^-7 M naphtaleneacetic acid (NAA). A synergistic effect of kinetin and NAA on starch formation was observed when both hormones were applied simultaneously over a wide range of concentrations.

A model method for testing cosmic radiation

M. Sosna

Biologia plantarum 15:430-432, 1973 | DOI: 10.1007/BF02922765

The experiments showed that after gamma irradiation as well as after irradiation by secondary cosmic rays (hard component)Equisetum arvense spores produce in the first developmental phases prothalia at a changed rate,i.e. in favour of the females. This effect being specific for radiation cannot be produced by heat, pressure or changes of electric and magnetic field (i.e. factors appearing in higher sea levels with a stronger intensity of cosmic rays). It will be possible to apply the sensitivity of the mentioned method for investigating the problems of testing cosmic ray variations. The possibility of its application in spontaneous...