Dormancy studies in black gram (Phaseolus mnngo L.)

S. Padmaja Rao, R. K. Mukherjee

Biologia plantarum 1978, 20:81-85 | DOI: 10.1007/BF02923264

Mechanical scarification of seeds ofPhaseolus mungo L. resulted in 100 per cent gormination in comparison to 90 per cent dormant control. Seeds treated with concentrated sulphuric acid for 8 min led to 85 per cent germination. Heat treatment at 70 °C for 24 h exhibited 75 per cent gormination, while boiled water treatment for 7 min caused 65 per cent germination.

The direction of selection of genetically heterogeneous cell populations of Dioscorea deltoidea Wall

S. L. Karanova, Z. B. Shamina

Biologia plantarum 1978, 20:86-92 | DOI: 10.1007/BF02923266

The initial strain ofDioscorea cell culture is characterized by a double-peak curve of mitotic activity, by dominance in the population of meristematic cells, by a great variety in the number of chromosomes and also by polyploidization in the process of cultivation.
After treatment with different doses of N-nitroso-N-methylurea (NMU) physiological parameters of the cell populations were found to change (dynamics of mitotic activity, ratio between types of cells). On passaging, physiological differences between the strains are levelled up.
The studied strains are characterized by different directions of cell selections,i.e. the control...

The influence of 1-naphthaleneacetic acid and (2-chloroethyl)-trimethylammonium chloride on the carotenoid content of tobacco tissue in suspension culture

K. Z. Gamburg

Biologia plantarum 1978, 20:93-97 | DOI: 10.1007/BF02923268

Carotenoid content of tobacco tissue grown in suspension culture was significantly affected by 2 mg . 1-¹ I-naphthaleneacctic acid (NAA) and 500 mg . 1-¹ (2-chloroethyl)-trimethyl-ammonium chloride (CCC). CCC caused a 4-fold increase of carotenoid concentration in the tissue and a 2-fold increase of carotenoid accumulation per one cultural flask mainly due to the appearance of significant amounts of lycopene. In the absence of NAA the tissue contained a much smaller amount of carotenoids and CCC failed to induce lycopene accumulation.

In vitro Responses of Embryoids ofEschscholzia californica

A. K. Kavathekar, P. S. Ganapathy, B. M. Johri

Biologia plantarum 1978, 20:98-106 | DOI: 10.1007/BF02923269

Thein vitro embryoids ofEschscholzia californica do not form normal plantlets in cultures. However, 6-benzylaminopurine and gibberellic acid, when added to the medium, partially alleviate this inhibition. Experiments involving decotylization, and culture of embryoids at different stages, indicated the cardinal role of cotyledons in plumular growth.

Effect of growth regulators on proliferation, pcroxldase activity and isopcroxldases in cell suspension ofSilene alba

B. Legrand, J. Dubois

Biologia plantarum 1978, 20:107-113 | DOI: 10.1007/BF02923271

Growth ofSilene alba (MILLER) E. H. L. KRAUSE cells, as well as their peroxidase pattern and activity are studied. Cells were grown in the presence and absence either of IAA, or NAA or 2,4-D. The subculture is dependent upon the growth regulator used to sustain the growth of cells. For 14 days' passages, subculture is possible with 2,4-D (5 x 10^-7M) or NAA (10^-5M) but impossible with IAA or without any growth regulators. Cells grown using 2,4-D or NAA in the medium contain a smaller number of isoperoxidases and have lower activities than those grown using IAA or no growth regulator. The nature of growth substances does...

Function of the basal pore in the germination of sugar-beet seed balls

M. Coumans

Biologia plantarum 1978, 20:114-118 | DOI: 10.1007/BF02923272

Anatomical analysis of the sugar-beet seed ball indicates two possible ways for the entrance of water and oxygen during germination: cells from the operculum periphery and cells from the basal pore characterized by absence of lignin and a thin layer of cellulose. Impermeabilisation of these zones by vaseline considerably reduces the percentage of germination and stresses the major role played by the basal pore. This can also be confirmed by variation in the germination percentage when sowing the seed ball with the basal pore up or down to the substrate.

Proline biosynthesis in winter plants due to exposure to low temperatures

M. Štefl, I. Trčka, P. Vrátný

Biologia plantarum 1978, 20:119-128 | DOI: 10.1007/BF02923274

The content of bound proline sharply increased in proteins of different organs of young plants of winter rape and winter wheat exposed for 72 h to temperatures from 0 to 2 °C while it decreased only in root tips of wheat plants. Free proline which at 20 °C occurs in all plant organs only in trace amounts, accumulated considerably after 72 h exposure to low temperatures in the above-ground organs and only slightly in the roots. Free proline did not accumulate during the first 24 h at 0 to 2 °C in detached leaves of winter wheat but it was incorporated into newly synthetized proteins in which proline content increased after 6 h incubation to its maximum...

Variability of some seed proteins of the speciesPhaseolus vulgaris and their relationship to phytohaemagglutinating activity

Eva Klozová, Věra Turková

Biologia plantarum 1978, 20:129-134 | DOI: 10.1007/BF02923276

The variability of some seed proteins ofPhaseolus vulgaris was followed in individual seeds of 26cultivars of this species. Polymorphism was established with two proteins showing completely different immunochemical specificities which have previously been classified as the protein I and the protein II of the specificity Veltruská Saxa and Krupnaya sakhamaya respectively. Various combinations of these proteins occur in several cultivars. It was further found that the protein II of the specificity Veltruská Saxa had phytohaemagglutinating activity.

Changes in phosphoenolpyruvate carboxylase and ribulosebisphosphate carboxylase activities in tobacco plants infected with tobacco mosaic virus

Olga Makovcová, L. Šindelář

Biologia plantarum 1978, 20:135-137 | DOI: 10.1007/BF02923278

Considerable changes in the activities of phosphoenolpyruvate carboxylase and ribulosebisphosphate carboxylase were found inNicotiana tabacum cv. Sarasun plants infected with TMV. Ribulosebisphosphate carboxylase is inhibited at the time of maximum TMV reproduction, but its decreased activity is at the same time partly compensated by phosphoenol-pyruvate carboxylase in the shoots of infected plants. The pattern of activity of this enzyme nearly exactly reflects the pattern of reproduction of the tobacco mosaic virus.

Cell Genetics in Higher Plants

Z. Opatrný

Biologia plantarum 1978, 20:85 | DOI: 10.1007/BF02923265

Induced Mutations Against Plant Diseases

T. Gichner

Biologia plantarum 1978, 20:92 | DOI: 10.1007/BF02923267

Geneties and Adaptation

Z. Opatrný

Biologia plantarum 1978, 20:106 | DOI: 10.1007/BF02923270

Biochemical Aspects of Plant-Parasite Relationships

Vlasta Čatská

Biologia plantarum 1978, 20:118 | DOI: 10.1007/BF02923273

Critical Evaluation of Systems Analysis in Ecosystem Research and Management

J. P. Ondok

Biologia plantarum 1978, 20:128 | DOI: 10.1007/BF02923275

Cytogenetics. Benchmark Papers In Genetics

T. Gichner

Biologia plantarum 1978, 20:134 | DOI: 10.1007/BF02923277

The Biology of Weeds

Z. Opatrný

Biologia plantarum 1978, 20:145 | DOI: 10.1007/BF02923281

The Physiology of the Garden Pea

Jarmila SolÁrovÁ

Biologia plantarum 1978, 20:148 | DOI: 10.1007/BF02923283

Incompatibility in Angiosperms

J. Tupý, I. Šetlík, Jarmila Solárová, T. Gichner, J. Brčák

Biologia plantarum 1978, 20:155-160 | DOI: 10.1007/BF02923285

Endogenous gibberellins and auxins in the stem ofbryophyllum crenatum in relationship to its polarity

J. Šebánek, F. Kopecký, K. Slabý

Biologia plantarum 1978, 20:138-141 | DOI: 10.1007/BF02923279

The analyses for the content of endogenous gibberollins and auxins in leaves and adjacent stem internodia of intactBryophyllum crenatum plants revealed that the level of gibberellins increases in tho direction from the apex to the stem base, whereas in the case of auxins the trend in the increase is tho reverse. This corresponds to the results of morphological experiments, according to which the apical stem part appears as affected by phytohormones of an inhibitory character, the basal part as affected by stimulatory ones.

The Effect of Gibberellic Acid on Photosynthesis, Respiration and Transpiration in Rye Leaves

W. Nowakowski

Biologia plantarum 1978, 20:142-145 | DOI: 10.1007/BF02923280

Gibberellic acid GA₃ (50 ppm) decreases the photosynthetic rate and increases respiration rate of rye leaves (Secale cereale L., cv. Dankowskie Zlote). The effect of GA₃ on transpiration rate is not distinctly marked.

A growth inhibitor fromCastanea sativa Mill. cuttings

Adelina Vazquez, M. D. V. Gesto, E. Vieitez

Biologia plantarum 1978, 20:146-148 | DOI: 10.1007/BF02923282

The effect on growth of an aliphatic acid isolated fromCastanea sativa cuttings was studied as well as its interaction with IAA. TheAvena coleoptile straight growth test was used. A growth inhibition was observed in a wide range of concentrations. The compound lowered or suppressed the IAA induced elongation of theAvena coleoptilo growth sections.

Difference between light- and wound-induced biosynthesis of α-solanine and α-chaconine in potato tubers

M. T. Wu, D. K. Salunkhe

Biologia plantarum 1978, 20:149-151 | DOI: 10.1007/BF02923284

Potato tuber tissues can incorporate mevalonic acid-2-14C into glycoalkaloids, namely α-chaconine and α-solanine. The percent incorporation of this labeled precursor into α-chaconine in light exposed tubers is more than that of mechanically injured tubers.