Professor Vladimír Úlehla the 20th anniversary of his death

V. Rypáček

Biologia plantarum 1967, 9:245-248 | DOI: 10.1007/BF02929764

The action of 1-alkyl-1-nitrosoureas and 1-alkyl-3-nitro-1-nitrosoguanidines on the M₁ generation of barley andArabidopsis thaliana (L.) heynh.

Jiří Velemínský, Tomáš Giohner, Václav Pokorný

Biologia plantarum 1967, 9:249 | DOI: 10.1007/BF02929765

The activity of 1-methyl-1-nitrosourea (MNH), 1-ethyl-1-nitrosourea (ENH), 1-methyl-3-nitro-1-nitrosoguanidine (MNG) and 1-ethyl-3-nitro-1-nitrosoguanidine (ENG) was tested on seeds of barley andArabidopsis. The activity of nitrosoamides tested was expressed by the germination and M₁ seedling height reduction of barley and M₁ root length reduction ofArabidopsis.
1) After the action of both nitrosoureas (MNH and ENH) the germination of barley is at the same level as that of controls, even at concentrations, leading to a maximal reduction in the height of seedlings. After the action of both nitrosoguanidines (MNG...

Morphological differentiation of flower buds in Apple-Trees

B. Benko

Biologia plantarum 1967, 9:263 | DOI: 10.1007/BF02929766

The paper deals with the study of morphological differentiation of flower buds in 10 varieties of apple-trees in relation to the growth of summer shoots and the earliness of varieties. The data obtained indicate that in the warmer regions of Slovakia the critical season of transformation of flower buds from vegetative to generative forms takes place, on the average, between July 20 and 29, and, at the same time, the variety Yellow Transparent deviates from the average four week-earlier. According to the author we can speak neither of a positive relation between the onset of morphological differentiation and the active growth of summer shoots nor of...

The study of the effect of amitrol on the respiration and activity of some enzymes in poppy plants (Papaver somniferum L.)

J. Zemánek, Jana Ambrožová

Biologia plantarum 1967, 9:270 | DOI: 10.1007/BF02929767

Papaver somniferum plants grown in pots in the phase of forming the first pair of leaves were treated by 6-4 ml of 0-02% solution of 3-amino-l,2,4-triazol (amitrol) per single pot, which is equal to the dose of 2 mg of amitrol per 100 cm² soil area One, four, seven and ten days after the application the effect of the herbicide on some physiological processes in the overground organs of plants was investigated.
Amitrol decreased the activity of catalase by 60% compared with control plants 1 day after the application, even though no external symptoms of damage were evident. On further action, the activity of catalase was suppressed...

The effect of glycine, humus substances and sucrose on the growth of tomato rootsin vitro

Ivana Helanová, Z. Sladký

Biologia plantarum 1967, 9:276-284 | DOI: 10.1007/BF02929768

The effect of glycine on the growth of isolated tomato roots in White's nutrient solution was studied. It is obvious that the root tips grow better in the medium without glycine, because increasing rates of glycine produce inhibition. The growth of root explantates in nutrient media indicates a high synthetic ability of isolated roots. Optimal concentrations of humus acids in White's nutrient solution without glycine and with glycine stimulate the growth of root explantates. It cannot be decided which of the two substances affects the root directly and which acts as a chelating agent in the medium. The effect of glycine varied, depending on the origin...

Role of 2,4-dichlorophenoxyacetic acid and of myoinositol in the formation of the callus on excised roots ofSolanum laciniatum AIT

J. Řeřábek

Biologia plantarum 1967, 9:285 | DOI: 10.1007/BF02929769

Exeised roots ofSolanum laciniatum Ait. grown in vitro in a liquid medium will form the typical rich white callus with a high water content. Its formation is made possible by the presence of 2,4-dichlorophenoxyacetic acid and niyo-inositol in the nutrient medium. Choline, ascorbic acid, riboflavin, calcium pantothenate and biotin are inactive. A mixture of thiamine, pyridoxine and nicotinic acid will induce only slight proliferation.

Genetic variation and phenotypic plasticity of roots in two cultivated species of jute (Corchorus olitorus L. andC. capsularis L.)

S. L. Basak, B. B. Chaudhuki

Biologia plantarum 1967, 9:292-300 | DOI: 10.1007/BF02929770

1. A number of varieties of cultivated juteGorchorus oHtorius L. andG. capsularis L. were tested in artificially created drought, waterlogging and control conditions.
2. The number of lateral roots with secondary growth was reduced to the minimum inC. capsularis under waterlogged conditions, but the weight of the roots was increased to the maximum, due to the production of numerous spongy and fibrous roots.C. olitorius suffered in both the characters under similar environment and failed to produce fibrous and spongy root. This species gained in root weight and lateral root number in drought under whichC. capsularis...

Fertilization of Barley (Hordeutn distichutn L.)

Mária Luxová

Biologia plantarum 1967, 9:301-307 | DOI: 10.1007/BF02929771

Fertilization of barley has been studied and photographically recorded. The pollen grain germinates almost immediately after attaching itself to the stigma, pollen tube reaches the embryo sac after 20-30 minutes (temperature 26°C). One of the sperms permeates immediately to the oosphere, the other joins polar nuclei migrating from the oosphere to antipodal cells after the discharge of pollen tube content. Fertilization of the polar nucleus occurs in most cases at the antipodal cells which have pronounced haustorial character.
In triple fusion polar nuclei do not usually fuse prior to fertilization. However, some exceptions were noted: sometimes...

Peroxidases of different parts of the pumpkin plant (Cucurbita pepo L.)

M. Dvořák, Jana Černohobská

Biologia plantarum 1967, 9:308 | DOI: 10.1007/BF02929772

We compared the occurrence of peroxidase isozymes in protein extract from roots, hypocotyls and cotyledons of 10 dayCucurbita pepo plants and of adult leaves of older plants by means of starch gel and polyacryl amide gel electrophoresis. We reached maximum discrimination by means of starch gel electrophoresis: 11 zones were ascertained on the cathode side and about 2 on the anode side at pH 3.1. Two zones occurred regularly:A and (the latter having a more complicated structure). ZoneD is characteristic for roots, but is it suppressed and seldom found with leaves. On the other hand zonesC ₁ andC ₂...

Effect of (2-chloroethyl) trimethylammonium chloride (CCC) and gibberellic acid (GA₃) on the flowering ofChenopodium rubrum L.

Lola Teltscherová, Helena Havlíčková, J. Krekule

Biologia plantarum 1967, 9:317 | DOI: 10.1007/BF02929773