Biologia plantarum, 1967 (vol. 9), issue 3

Article

Golgi Apparatus and Golgi Zone

I. HrŠel

Biologia plantarum 9:157-167, 1967 | DOI: 10.1007/BF02929733

The author of this paper has attempted to clarify some problems concerning the nomenclature of Golgi apparatus and Golgi zone. The actual aim of this paper is to summarize - while using the more safe nomenclature-the existing knowledge about the functional relations between nucleus and cytoplasm arising from the study of the juxtanuclear zone by electron microscopy. Some observations lead to the assumption that the juxtanuclear zone is the place where cell components are formed or transformed. Considering its temporary character in proliferating cells and taking into account the connections with endoplasmic reticulum and the presence of pores, the...

Summary method for determining the water consumption for the transpiration of woody plant seedlings

M. Penka

Biologia plantarum 9:168-172, 1967 | DOI: 10.1007/BF02929734

A method of calculation for determining the total transpiration (consumption of water for transpiration) of a single woody plant seedling or of their growth during periods of different length (from one day up to the whole vegetative season) is described and critically evaluated; the calculation is performed according to single transpiration intensity measuring results, by the cut-shoot method and weighing at 8, 11, 14 and 17 hours (or more often during the day).

The influence of light, darkness and changes in co₂ and o₂ concentration in die atmosphere on growth and gas exchange in pea (Pisum sativum)

Jana Barthová, Sylva Leblová, J. Koštíř

Biologia plantarum 9:173, 1967 | DOI: 10.1007/BF02929735

When compared with the control plants, the increase in dry weight in the growing parts of germinating plants ofPisum sativum L., cultivated in a closed atmosphere in darkness or light is heavily inhibited. The concentration of carbon dioxide in the closed atmosphere increased in 60 mg CO₂/per 1 g of the final dry weight of plants after 10 days. Similar results were obtained with older plants under similar conditions. The Knop solution caused a slight increase of dry weight in the growing parts of plants, but did not change considerably the relations in gas exchange. The results show that even plants which are able to photosynthetize,...

Role of auxin and gibberellin in the synthesis of Ascorbic Acid and growth of tissue explants

J. J. Chinoy, C. K. Shah, Hemlata T. Patel, H. K. Suthar

Biologia plantarum 9:182, 1967 | DOI: 10.1007/BF02929736

Coleoptile and root tips ofTriticum aestivum cv. Arnej 624 and those ofAvena sativa cv. Victory (Svalöf) as well as dry excised embryos ofTriticum aestivum cv. Rival (Svalöf) and those ofArachis hypogaea cv. 34 3A. H. were cultivated in media containing various concentrations of sucrose and growth regulators, like ascorbic acid, indole-3-acetic acid and gibberellin. Growth, differentiation and water uptake of the various explants were determined at regular time intervals. Further, the concentration of the endogenous ascorbic acid in mg./g. fresh weight, as well as the amount of this growth regulator utilized as per cent...

Changes in the formation of the lignified cell wall within a twenty-four hour period

M. Bobák, V. Nečesaný

Biologia plantarum 9:195-201, 1967 | DOI: 10.1007/BF02929737

The purpose of this paper is to determine the sequence of the formation of the lignified cell wall and to confirm the hypothesis expressed previously on the alternate deposition of cellulose and lignin in a 24-hour period. In this connection, the inner surface of the cell wall of the fibre cells from the youngest wood ofPopulus nigra L. 'Italica' taken during a typical summer day in two-hours' intervals was investigated electron microscopically.
The fine structure of the inner surface of the growing secondary cell walls was found to change regularly within 24 hours and to be determined by the structure of the components just being deposited....

Redox potential gradients in the flower

J. Benada

Biologia plantarum 9:202-204, 1967 | DOI: 10.1007/BF02929738

Distinct redox gradients were found in flowers and stalks of some plants. The ovary was found to be the most negative part in the whole pistil and more negative than the coloured perigon or corona leaves. These redox differences are in accordance with biopotential differences obtained in flowers by other authors.

B chromosome frequency in yugoslav rye populations

L. Zečević, Dobrila Paunović

Biologia plantarum 9:205-211, 1967 | DOI: 10.1007/BF02929739

The cytological analysis of 25 Yugoslav rye populations, collected from Slovenia Serbia and Macedonia, showed the presence of B chromosomes in the all populations analysed (100%). The number of B chromosomes present was small, from 1 to 3, while the average number per plant ranged from 0-13 to 0.97. The frequency of rye plants with B chromosomes for Yugoslavia had an average of 27.10%. The frequency of plants with B chromosomes and the average number of that chromosome category per plant were appreciably greater in the arid region of Macedonia than in the humid region of Slovenia, the differences being significant and real biometrically.
Comparing...

Kinetin reversal of the synergistic inhibitory effect of 2,4-dichlorobenzyl-tributylphosphonium chloride and coumarin on the germination of brassica oleracea L. var.acephala Seeds

J. S. Knypl

Biologia plantarum 9:212, 1967 | DOI: 10.1007/BF02929740

Kinetin (10^-4 m) is initially more effective than GA (10^-4M) in reversal of the inhibitory effect of Phosfon D (10^-3m) on the germination of kale seed (Fig. 2 and Fig. 3). Kinetin is about 2.5 times more effective than GA in reversal of the synergistic inhibitory effect of coumatin (100 p.p.m.) plus Phosfon D on germination of kale (Fig. 2 and Fig. 4); initially most effective in this respect is a supraoptimal concentration of kinetin, 5 x 10^-4M, which markedly inhibits germination in the control.
It seems that kinetin, Phosphon D and coumarin act specifically on the process of germination. It is suggested...

Water Uptake during Rapid Changes of Transpiration Induced by the Presence of High Concentration of Growth Substances in Root Medium

V. Kozinka

Biologia plantarum 9:222, 1967 | DOI: 10.1007/BF02929741

Immediate response of water uptake by intact plants ofPisum sativum L. to the introduction of high concentrations of α-naphtaleneacetic acid (NAA), β-indoleacetic acid (IAA), 2,4-dichlorophenoxyacetic acid (2,4-D), 2-methyl-4-chlorophenoxyacetic acid (MCPA), coumarin was determined by a series of potometric measurements. Growth substances were present in the root medium in two concentrations: 10^-3 m and 10^-2 m; the concentration of coumarin was 5. 10^-4 m and that of EDTA was 10^-3 m.
The response of water uptake to the application of the growth substances and coumarin was always negative....

Effect of some pyrimidine analogues on flowering of long-day and short-day plants

Lola TeltscherovÁ, Frideta SeidlovÁ, J. Krekule

Biologia plantarum 9:234, 1967 | DOI: 10.1007/BF02929742

6-azauracil (AU) and 2-thiouracil (TU) were applied to the short-day plants Pharbitis Nil and Chenopodium rubrum and to the long-day plants Hyoscyamus niger, Lolium temulentum and Triticum aestivum cv. Chlumecká 12 at different times before, during or at the end of floral induction. In wheat the effect of 5-bromouracil, 5-iodouracil and 2-thio-6-azauracil was also tested.With the exception of bromouracil, which slightly stimulated flowering in wheat, all analogues either strongly inhibited or completely blocked flowering when applied in appropriate concentrations a short time prior to induction or at its beginning. Treatments given a longer time before...