Book review

Ingrid Tichá

Biologia plantarum 1980, 22:96 | DOI: 10.1007/BF02878245

Book review

V. Herout

Biologia plantarum 1980, 22:106 | DOI: 10.1007/BF02878247

Book reviews

P. Tichý

Biologia plantarum 1980, 22:134 | DOI: 10.1007/BF02878252

Book reviews

F. Pospíšil

Biologia plantarum 1980, 22:142 | DOI: 10.1007/BF02878254

Book reviews

J. Ullmann, Frideta Seidlová, I. Dvořák, J. Weiser, K. Beneš, Jana Pospíšilová

Biologia plantarum 1980, 22:157-160 | DOI: 10.1007/BF02878258

Pattern of growth regulating substances in the leaves of vernalized sugar-beet during flowering period

S. Khalil, F. Reda

Biologia plantarum 1980, 22:81-85 | DOI: 10.1007/BF02878242

The changes in the levels of growth regulating substances using the wheat coleoptile straight growth test were determined in the leaves of vernalized (flowering) and non-vernalized (non-flowering) plants of sugar-beet, cv. Poly-AG-Poland at two stages; the end of vernalization treatment (210 days from planting) and full-flowering stage. IAA was detected only in the extracts of the leaves of non-vernalized plants after210 days from planting. No inhibitory activity was detected, except in the case of the concentrated extract of the leaves of non-vernalized plants. This growth promoting zone was found at R_f 0.5-0.8 in the leaves of flowering...

Effect of indoleacetic acid on the metabolic activity oftaraxacum root segments

M. I. Khan

Biologia plantarum 1980, 22:86-90 | DOI: 10.1007/BF02878243

Inoubation of thin slioes ofTaraxacum root segments in 3-indoleaoetic acid solutions enhanced the level of total proteins, RNA, DNA and a number of enzymes reaching an optimum at 0.01 mg 1^-1. It has been shown that the auxin promotes the synthesis of DNA, again with an optimum promotion at 0.01 mg 1^-1 IAA.

The effect of growth regulators on sodium azide induced genetic damage in barley

C. Singh, J. Olejniczak, P. Hoppe, H. Patyna

Biologia plantarum 1980, 22:91 | DOI: 10.1007/BF02878244

The influence of growth regulators (GA and IAA) on the genetic effects of sodium azide was studied. Treatments with growth regulators were administered either prior to or after the mutagen. Post-treatments were found to be more effective against mutagen-induced plant growth injury and gave a slightly higher frequency of mutations. M₁ spike sterility however showed a rise following treatments with growth regulators.

Effect of decapitation on morphogenesis of stem and spike in various wheat species

J. Vagera

Biologia plantarum 1980, 22:97-106 | DOI: 10.1007/BF02878246

Decapitation induced an additional formation of secondary shoots and anomalous spikes in all the species. The moan numbers of nodes, spikelets per spike, seeds per spikelet and spike, and the mean length of the stem and spike were reduced on secondary shoots of decapitated plants, while the mean and peak numbers of flowers per spikelet and the peak number of seeds per spikelet increased. The increase in the number of flowers per spikelet was the most striking on spike base; the seeds regularly occurred even in spikelets with an expressively increased number of flowers. The post-decapitation changes of the spike could be well expressed quantitatively...

The role of some exogenous and endogenous factors in the isolation of protoplasts from potato cell cultures and their recovery in cell colonies

Z. Opatrný, Ursula Schumann, S. Rakouský, H. Koblitz

Biologia plantarum 1980, 22:107-116 | DOI: 10.1007/BF02878248

Protoplasts isolated from cell suspension cultures of potato were cultured as far as the level of regeneration of substrains. The influence of various factors (age of the cell culture, mode of precultivation, composition of the enzymatic mixture, incubation period) on the efficiency of isolation as well as the viability of protoplasts, has been studied. Various cultivation procedures have been screened and the effect of especially the hormonal composition of the medium on different phases of the regeneration of cell colonies (regeneration of the cell wall, growth and elongation, cell division) evaluated.

Adaptability ofMentha piperita l. to irradiance. Growth, specific leaf area and levels of chlorophyll, protein and mineral nutrients as affected by shading

A. Virzo De Santo, A. Alfani

Biologia plantarum 1980, 22:117-123 | DOI: 10.1007/BF02878249

Height growth ofMentha piperita L. is better at 44% than 100% daylight. At 14% daylight, growth is limited, probably by lack of photosynthate, and no flowering occurs. Specific leaf area and protein content increase significantly with the decrease of irradiance. Shade leaves contain more chlorophyll and potassium than sun leaves. Sun leaves show higher levels of calcium because of their more xeromorphic structure. Transfer experiments between light and shade indicate thatM. piperita responds very effectively to irradiance also in a late stage of the life cycle with changes of specific leaf area and chlorophyll content.

Histoenzymological compartmentation of β-glucuronidase in the germinating pollen grains ofPortulaca grandiflora

P. P. Sood

Biologia plantarum 1980, 22:124-127 | DOI: 10.1007/BF02878250

The contribution deals with the distribution of β-glucuronidase in the germinating pollen grains ofPortulaca grandiflora. In non-germinating pollen grains the enzyme is localized in the pollen wall; the cytoplasmic activity is subdued. With the initiation of germination, the activity of enzyme increases and the positive granules are richly packed in the pollen grains and pollen tubes. The stigma hairs also have such an activity. The functions of the enzyme in the metabolism of germinating pollen grains are discussed.

The influence of light on the cytokinin content ofAmaranthus seedlings

K. H. Köhler, Marianne Dörfler, H. Göring

Biologia plantarum 1980, 22:128-134 | DOI: 10.1007/BF02878251

The influence of light, particularly blue and red light, on the cytokinin content of seedlings ofAmaranthus caudatus was studied. Cytokinin content was determined by two different bio-assays (amaranthin accumulation byAmaranthus seedlings and mtrate-reductase activity ofAgrostemma embryos). In both bio-assays similar results were obtained. Oytokinin content is increased, especially by blue light. It is suggested that especially blue light promotes amaranthin accumulation inAmaranthus seedlingsvia the increase of cytokinin content of tissues. The results support our hypothesis on cytokinin action.

Stabilized Dormancy in Sugarbeet Fruits: Mechanical Removal of the Cap under Imbibition Pressure

M. Coumans, E. Ceulemans, Th. Gaspar

Biologia plantarum 1980, 22:135-142 | DOI: 10.1007/BF02878253

Among different populations of monogerm sugarbeet fruits, those characterized by the lowest percentages of germination exhibited the lowest percentages of mechanical deoperculation (removal of the fruit cap under the sole imbitition pressure). X-ray radiography of dry fruits allowed a classification based on the space occupied by seeds inside the fruit cavity and further established a correlation between the fruit type (filled, semi-filled, empty), passive deoperculation and germination. The degree of correlation depended on the amount of bedding water which further conditioned the fruit surrounding water film.

Nucleases in chloroplast of barley

Jiřina Švachulová, J. Velemínský, J. Šatava

Biologia plantarum 1980, 22:143-151 | DOI: 10.1007/BF02878255

Two barley chloroplast nuclease fractions were separated by the affinity chromatography and gel electrophoresis. Both were about 2 times more active to RNA than to native DNA and about half as active to denaturated DNA as to native DNA. Both fractions were as active to UV-irradiated (270 J m^-2) native DNA as to intact DNA but their action was inhibited by apurinic sites. The enzyme activities were inhibited by high concentrations of EDTA, NaCl, Mn²⁺, Ca²⁺, Zn²⁺ ions and by N-ethylmaleimide. They do not require Mg²⁺ ions but are stimulated or at higher concentration inhibited by their presence....

Induction of sieve-tube elements in the ray system ofMorus alba L

H. K. Sharma, D. D. Sharma, G. S. Paliwal

Biologia plantarum 1980, 22:152-153 | DOI: 10.1007/BF02878256

The effect of exogenous supply of a morphactin - chlorflurenol (IT-3456) CME 74050 p at three concentrations of 100, 500, and 1000 ppm (all applied as dispersions in lanolin paste after scraping the epidermis during December, 1976) was studied on two-year-oldMorus alba plants. Almost three months after the treatment of the regulator, along with the normal sievetube elements of the axial system, these elements were recorded in the ray system as well, arranged either vertically or horizontally. In the latter state, they appear to act as a by-pass between the normally formed sieve elements located on either side of the ray. We have termed them...

Differences in stomatal density, dimension and conductances to water vapour diffusion in sevenHevea species

Z. Samsuddin

Biologia plantarum 1980, 22:154-156 | DOI: 10.1007/BF02878257

The stomatal density, dimension and conductances to water vapour diffusion of sevenHevea species were studied. It was found that these parameters were significantly different between the species. However, no distinct relationship between stomatal density or dimension and stomatal conductances could be discerned.