Book review

M. Ondrej

Biologia plantarum 32:88, 1990 | DOI: 10.1007/BF02897544  

Book review

Ivana Macháĉková

Biologia plantarum 32:96, 1990 | DOI: 10.1007/BF02897546  

Book review

T. Gichner

Biologia plantarum 32:112, 1990 | DOI: 10.1007/BF02897549  

Book review

Ivana Macháĉková

Biologia plantarum 32:127, 1990 | DOI: 10.1007/BF02897553  

Book review

J. Krekule

Biologia plantarum 32:137, 1990 | DOI: 10.1007/BF02897555  

Oxidized and reduced glutathione, ascorbate and glutathione reductase inmatricaria recutita L. Callus cultures

D. Podhradský, Eva Ĉellárová, R. HonĈariv

Biologia plantarum 32:81, 1990 | DOI: 10.1007/BF02897543  

In the long-term cultivated callus cultures ofMatricaria recutita L. the identical concentration changes in the biosynthesis of glutathione, glutamate, aspartate, total thiols and proteins were detected within the subculture. The level of oxidized glutathione during the growth of callus culture was low with the highest value 10.66 nmol g^-1 on the 13th day of subculture. The ratio GSH/GSSG which significantly influences the redox processes in a cell, and the activity of glutathione reductase increased from the 8th day. Ascorbate formation was detected on the 17th day, although no relation between the ascorbate synthesis and the concentration...

The effect of cytokinins on nitrate reductase activity

Alena GaudinovÁ

Biologia plantarum 32:89, 1990 | DOI: 10.1007/BF02897545  

Cytokinins in addition to nitrate induce nitrate reductase activity (NRA) in some plants. Effects of cytokinins onNRA was investigated in stem pith parenchyma of kale, intact wheat and barley seedlings and isolated cucumber cotyledons.The most profound effect onNRA was found in barley and wheat seedlings.NRA in seedlings sprayed with 100 μM 6-benzylaminopurine (BAP) for three subsequent days was increased in leaves and decreased in roots. These changes were further enhanced in seedlings grown in nutrient solution lacking nitrate:NRA in wheat and barley leaves was increased by 57% and 202%, respectively, in plants...

Acidification stress of root environment as related to endogenous cytokinins and gibberellins in oak seedlings

Radmila Èí¾ková

Biologia plantarum 32:97-103, 1990 | DOI: 10.1007/BF02897547  

Activity of endogenous cytokinins and gibberellins was determined in the shoots and roots of oak seedlings following the submersion of roots in water acidified with sulphuric add to pH 3.0, 2.5, 2.0, 1.7 and 5.6 (control) for 6 and 72 h. After 6 h the cytokinins increased in the shoots and in roots at pH 2.5 and 2.0, respectively. None of the tested pH values decreased the cytokinin activity. The acidification of solutions exhibited no remarkable influence on gibberellin activity. Only slight stimulation of the gibberellin activity was exhibited at pH 2.0. After 72 h a slight decrease in the activity of cytokinins was observed in the shoots at pH 2.5,...

The effect of proline application on the physiology ofraphanus sativus plants grown under salinity stress

M. A. Shaddad

Biologia plantarum 32:104-112, 1990 | DOI: 10.1007/BF02897548  

Transpiration rate, stomatal frequency, growth, contents of pigments, saccharides, total nitrogen, proteins and some nutritive elements (K, Ca, Mg, P) of radish plants were significantly lowere dwith the rise in salinization levels using NaCl. Spraying radish shoots with proline solution (200 g m-³) counteracted the above adverse effects, especially at low and moderate salinity.

Vicia faba chromosome damage induced by low doses of gamma radiation

P. Kuglík, Jana ©lotová, Renata Dobøická, Z. Karpfel

Biologia plantarum 32:113-118, 1990 | DOI: 10.1007/BF02897551  

The rate of radiation damage to chromosomes by low doses of gamma rays (0.01-0.30 Gy) was studied in the root tips ofVicia faba. As criteria of the effect of ionizing radiation, the frequency of sister chromatid exchanges (SCEs), incidence of chromosomal aberrations and the number of micronuclei were evaluated and compared in irradiated cells. The results obtained confirmed that the analysis of SCEs did not represent an efficient indicator of radiation damage to chromosomes. On the contrary, the formation of chromosomal aberrations and micronuclei was effectively stimulated by low radiation doses, there being linear dose-effect relationships...

Changes in ribonuclease and glucose-6-phosphate dehydrogenase activities during PVY-RNA biosynthesis in potato leaf discs

L. ©indeláø, Milada ©indeláøová, Noemi Èeøovská, Miloslava Hanu¹ová

Biologia plantarum 32:119-127, 1990 | DOI: 10.1007/BF02897552  

Changes in fresh matter content, protein content, chlorophyl content, ribonuclease activity, and glucose-6-phosphate dehydrogenase activity, associated with potato Y-virus multiplication (common strain, PVY ordinary) were studied in discs cut from potato leaves. The results obtained showed that marked decreases in disc fresh matter, in protein content, and in chlorophyll content occurred during a 5-day-long cultivation period. The activity of glucose-6-phosphate dehydrogenase, that is of the rate limiting enzyme of the pentose phosphate pathway, and the activity of ribonucleases which characterize the rate and intensity of host RNA degradation were...

Influence de i'acide abscissique sur le transport d'ions inorganiques chez la pomme de terre (solanum tuberosum cv. Bintje). etude comparée avec quelques autres phytohormones

Sausan Suleiman, Annick Hourmant, Michel Penot

Biologia plantarum 32:128, 1990 | DOI: 10.1007/BF02897554  

Using detached leaves of potato plants (Solanum tuberosum cv. Bintje) it was shown that abscisic acid (ABA) induced an oriented transport of ions (⁸⁶Rb,³²P and^3SS) towards the hormone-treated leaflet. In order to understand the hormone effect on cell permeability, pretreatment of discs with hormonal solution was conducted. The pretreatment with ABA stimulated the uptake of K⁺ simultaneously with the decrease of efflux.The effect of ABA on ion uptake is compared with the action of other hormones, benzylaminopurine (BAP), gibberellic acid (GA₃) known to act over a long distance transport,...

Influx and efflux of inorganic phosphate in sweet potato slices. effects of abscisic acid on bi-phasic kinetics

G. F. Israelstam, P. C. T. Chan

Biologia plantarum 32:138, 1990 | DOI: 10.1007/BF02897556  

Influx and efflux of inorganic phosphate was determined in freshly cut and "aged" slices of sweet potato tubers, in the presence or absence of abscisic acid. Slices aged in the phytohormone took up considerably less phosphate than did the control slices. No difference in the rates of uptake of phosphate by the fresh tissue was observed. Kinetics of uptake of the aged untreated slices, proved to be bi-phasic. This was not the case for the treated slices. Neither the treated nor the untreated uptake curves for the fresh slices were bi-phasic. Efflux of phosphate from the slices aged in abscisic acid was greater than from the untreated slices. The results...

Changes in macromolecule syntheses under special consideration of UNA and the energy providing system in imbibing embryos of different agedagrostemma githago L. Seeds

R. Kosanke, D. Bernhardt, K. H. KÖhler, Birgit Voigt

Biologia plantarum 32:145, 1990 | DOI: 10.1007/BF02897557  

Changes in macromolecule syntheses, especially RNA synthesis, and the energy providing system were investigated in seeds ofAgrostemma githago aged for different periods. In embryos of aged seeds all macromolecule syntheses start later and reach a lower level than young ones. It was found that the synthesis of rRNA in embryos of aged seeds is reduced whereas the synthesis of poly (A⁺) RNA in relation to the total RNA synthesis is highly increased as well as the amount of this RNA species with long poly (A) chains. The results are discussed in connection with the decreased protein synthesis and the reduced ATP content and ATP formation...

Effect of water stress upon cell division in root tips oferagrostis carvula (SCHRAD.) NEES

G. V. Echenique, N. R. Curvetto

Biologia plantarum 32:153-160, 1990 | DOI: 10.1007/BF02897558  

This study was carried out to investigate the effects of water stress on cell division, relative frequency of different phases of mitosis and mitotic index in root tips of two cultivars of Eragrostis curvula (Schrad. Nees) (weeping lovegrass). The water stress treatment affected both cultivars by increasing mitotic index as a result of changes in the relative frequency of cells in interphase and prophase with marked increases in the prophase index. These increases were more evident in the less resistant cultivar. Changes in the relative frequency of other phases were also observed. The presence of cells with persistent nucleoli was detected, and the...

Medical and arometic plants Abstracts publication and information Directorate, CSIR, Hillside Road, New Delhi 110012 India

Biologia plantarum 32:112, 1990 | DOI: 10.1007/BF02897550