Book reviews

Jana Pospíšilová, J. Tupý

Biologia plantarum 22:273, 1980 | DOI: 10.1007/BF02892771

Book review

T. Gichner, Jarmila Solárová, Jana Pospíśilová, Věra Hadačová, V. Kůdela, J. Ullmann, B. A. Kvíčala, V. Škrdleta, V. Našinec

Biologia plantarum 22:313-318, 1980 | DOI: 10.1007/BF02892781

In memorium of Miloš Spurný

J. Úlehla

Biologia plantarum 22:319-320, 1980 | DOI: 10.1007/BF02892782

Antiviral activity of substituted 5-chlorodiphenylamine-2-carboxylic acid hydrazides and their N-benzylidene derivatives

S. Bahadur, S. P. Singh, H. N. Verma, L. P. Awasthi

Biologia plantarum 22:241, 1980 | DOI: 10.1007/BF02892764

The substituted 5-chlorodiphenylamine-2-carboxylic acid hydrazides and their N-benzylidene derivatives were tested for their antiviral activity against gomphrena mosaic virus in a hypersensitive hostin vitro as well asin vivo. Most of the compounds exhibited potential antiviral activity. These compounds may be useful in controlling viral infections in garden as well as in field crops.

Effects of actinomycin D, cycloheximide and kinetin on ribonuclease and beta-fructofuranosidase in water stressed tomato cotyledons

Ong Hean Tatt

Biologia plantarum 22:245, 1980 | DOI: 10.1007/BF02892765

Three days old excised tomato cotyledons were subjected to mannitol induced water stress in the presence of actinomycin D and cycloheximide. Within a few hours, in the presence of actinomycin D but not cycloheximide, water stress induced increase in ribonuclease activities and decrease in beta-fructofuranosidase activities. The water stress action in the presence of actinomycin D was reversible by addition of kinetin. It was postulated that water stress had some immediate fundamental action on the protein synthesis sites at the ribosomes.

Effects of mannitol induced water stress on the ribosomes of intact leaves of Azuki bean seedlings

Ong Hean Tatt

Biologia plantarum 22:249, 1980 | DOI: 10.1007/BF02892766

Sucrose gradient analyses were made on free ribosomes extracted from Azuki bean seedling leaves subjected to mannitol induced water stress. Comparisons were made of the effect of duration of stress and the effect of urea on the free ribosomes. The capacities of the ribosomal fractions to incorporate amino-acids were also studied. Water stress reduced total free ribosomes and proportion of polysomes in the ribosomes as well as the capacity of the ribosomes to incorporate amino-acids into proteins. Polysomes which were broken down by the water stress also appeared to be more susceptible to denaturation and synthesized different proteins than polysomes...

Chlorophyllase in citrus leaves. Kinetic aspects of the reaction

A. L. García, L. Galindo, S. Navarro

Biologia plantarum 22:255, 1980 | DOI: 10.1007/BF02892768

The reaction: Chlorophyll + Enzyme → Chlorophyllide + Phytol follows a first order kinetics with regard to the quantity of enzyme, when it is saturated by substrate. K_m and V_m were determined from the average reaction rates for the substrates: Chlorophylla andb, pheophytina andb, methylchlorophyllidea and methylpheophorbide a: The lowest K_m corresponded to chlorophylla and the highest V_m to methylpheophorbidea. For a substrate of chlorophyll (a + b), K_m and V_m were determined also using the initial reaction rates. "Enzyme efficiency"...

Screening of poplar trees for antibacterial, antifungal and antiviral activity

Lucia Van Hoof, D. A. Vanden Berghe, A. J. Vlietinck

Biologia plantarum 22:265-273, 1980 | DOI: 10.1007/BF02892770

The leaves of poplar trees (genusPopulus) contain antimiorobial agents. These antibiotic properties are markedly influenced by interspecific and intraspecific hybridizations. Fractionation of the weakly active crude extracts results in more active antibacterial fractions. There are indications that the substances which inhibit antimicrobial effects during the testing procedure remain in the methanol fractions. In addition the results show that the antibacterial agents differ from the antifungal compounds, which both are different from the antiviral substances.

Grain yield and ear development of spring barley as influenced by environmental conditions during early stages of plant development

R. Frank

Biologia plantarum 22:274-281, 1980 | DOI: 10.1007/BF02892772

Barley plants were grown until day 21 under conditions which were different in relation to photon flux density, carbon dioxide concentration and temperature. Dry weight and leaf area increase from day 7 until day 21, shoot apex development between day 15 and day 47, and yield of each treatment group were considered. Photon flux density was demonstrated to have a greater influence on net assimilation rate (NAR) of young plants than has carbon dioxide enrichment. High temperature treatment seems to influence NAR less than growth and developmental processes. Grain yield of high temperature treated plants was significantly lower than that of the other...

High altitude acclimatization in plants: Stomatal frequency and anatomical changes in leaves ofArtemisia species

S. Nautiyal, A. N. Purohit

Biologia plantarum 22:282-286, 1980 | DOI: 10.1007/BF02892773

During high altitude acclimatization both the number of stomata and their pore width decreased. The number of open stomata per unit leaf area in the morning and evening hours was higher as compared to that in plants grown at a lower altitude. Thickness of leaves also decreased at high altitudes but the effect on the size of epidermal, mesophyll and spongy parenchymatous cells varied from species to species. Adaptational significance of these changes are discussed.

Deoxyribonucleic acid synthesis and deoxyribonucleic acid-polymerase activity during early germination of wheat embryos at high and low viability

A. Dell'Aquila, Lucia Lioi, I. Scarascia

Biologia plantarum 22:287, 1980 | DOI: 10.1007/BF02892774

³H-thymidine incorporation and DNA-polymerase activity during early hours of wheat embryo germination at two viability levels have been studied. The patterns of two biosynthetic activities, as well as the dependence of DNA synthesis on protein synthesis, indicated the presence of a delay in the early phase of imbibition of the aged embryos with respect to viable germs.

Effect of some mineral ions on pollen tube growth and release of proteins in culture

Věra Čapková-Balatková, Eva Hrabětová, J. Tupý

Biologia plantarum 22:294, 1980 | DOI: 10.1007/BF02892776

In the absence of cations, the release of proteins from pollen tubes ofNicotiana tabacum in culture is greatly dependent on boron concentration and inversely related to growth stimulation. The minimum of proteins in the medium occurs at 100 mg 1^- of boric acid, which is the optimum concentration for growth. The shift of boron level to this optimum further increases the proportion of proteins bound to the insoluble pollen tube fraction; on the other hand the amount of soluble proteins is not affected inside pollen tubes, but greatly decreased in the medium.The loss of proteins into the medium is considerably reduced by oalcium...

Chromosomal instabilities in callus tissue from haploid barley (Hordeum vulgare L.)

F. J. Novák

Biologia plantarum 22:303, 1980 | DOI: 10.1007/BF02892778

Callus culture was derived from haploid barley embryos after crossing withHordeum bulbosum. The callus tissue is cytologically heterogeneous, containing haploid, diploid and polyploid cells. Aneuploidy and karyokinetic irregularities were also observed. Some problems of chromosomal instabilities in plant tissue cultures are discussed.

Concentration-Dependent inhibition and enhancement of glutamine synthetase, glutamate dehydrogenase and nitrate reductase activities in pea roots by some respiratory inhibitors and uncouplers

J. Sahulka, Ludmila Lisá

Biologia plantarum 22:306, 1980 | DOI: 10.1007/BF02892779

The effect of 2,4-dinitrophenol (2,4-DNP), NaN₃, and iodoacetic acid (IDA) on glutamine synthetase (GS) and the effect of arsenate on GS, glutamate dehydrogenase (GDH) and nitrate reductase (NR) was studied in isolated pea roots. In sucrose supplied roots, GS level is depressed by higher concentrations of all the inhibitors tested and increased by lower (2 × and 3 × 10^- M) concentrations of 2,4-DNP; the decrease in GS level caused by sugar starvation is enhanced by all but IDA. GDH is enhanced by arsenate in a wider range of concentrations in sucrose-supplied roots than in roots cultivated without sucrose. NR is affected by arsenate...

Some pea cultivars as local lesion hosts for potato virus X

P. Dědič

Biologia plantarum 22:310-313, 1980 | DOI: 10.1007/BF02892780

SixteenPisum sativum cultivars were mechanically inoculated with two isolates of PVX. Distinct necrotic local lesions on the inoculated leaves were found in six cultivars 5 to 6 days after inoculation. The best results were obtained with the Meteor and Raman cultivars, 17 to 23 days old.

Electron microscopy and cyctochemistry of plant cells

K. Beneš

Biologia plantarum 22:254, 1980 | DOI: 10.1007/BF02892767

Molekular- und zellbiologie

T. Gichner

Biologia plantarum 22:264, 1980 | DOI: 10.1007/BF02892769

The biology ann taxonomy of theSolanaceae

Jarmila Solárová

Biologia plantarum 22:293, 1980 | DOI: 10.1007/BF02892775

Beiträge zur Gehölzkunde 1979

Ingrid Tichá

Biologia plantarum 22:302, 1980 | DOI: 10.1007/BF02892777