Effects of some carbon sources on growth and nitrogen fixation in the cyanobacteriumNostoc linckia

D. K. Mishra, H. D. Kumar, M. Jha

Biologia plantarum 1985, 27:1 | DOI: 10.1007/BF02894623

Glucose, fructose, sucrose, maltose, and lactose stimulated photoheterotrophic growth ofNostoc linckia (Roth.)Born. as well as its heterocyst frequency, chlorophyll and protein contents, ammoniacal nitrogen uptake and nitrogenase activities. Glucose, fructose and sucrose also supported slow chemoheterotrophic growth. α-ketoglutarate, pyruvate, ribose, succinate, acetate, sorbose and formate were inhibitory.

Effect of hormone on chromosome behaviour in callus cultures ofAsparagus racemosus

D. K. Kar, S. Sen

Biologia plantarum 1985, 27:6-9 | DOI: 10.1007/BF02894624

Chromosomal variability in callus culture ofAsparagus racemosus was comparatively higher in the presence of 2,4-D than of NAA. The frequency of polyploid cells was enhanced with the increase in the concentration of 2,4-D or with the addition of coconut water. Gradual polyploidization with increasing age of the callus has been recorded.

In vitro induction of androgenesis inCapsicum annuum L. and its genetic aspects

J. Vagera, P. Havránek

Biologia plantarum 1985, 27:10 | DOI: 10.1007/BF02894626

A low frequency androgenesis was inducedin vitro in all experimental variants ofCapsicum anthers cultured in standard and minimalized media. The embryogenic frequency was stimulated by the presence of activated charcoal which also prolonged the vitality of the culture. The percentage of embryoids growing to complete plants increased, if the embryoids were removed from the anthers and cultured separately. The morphogenic initiation of globular embryoids was conditioned by the presence of FeEDTA in the culture medium. The stimulation of androgenesis initiation can be explained by the same change in the decisive factor caused by various...

Mutational events after recurrent or chronic exposures of mutagenic and promutagenic N-nitroso compounds to a heterozygous tobacco tester strain

J. Bříza, T. Gichner, J. Velemínský, Z. Opatrný

Biologia plantarum 1985, 27:22-27 | DOI: 10.1007/BF02894628

Recurrent exposures (17 administrations in 37 days) to the direct-acting mutagens N-methyl-N-nitrosourea and N-ethyl-N-nitrosourea and a chronic exposure (38 days) to the metabolism-requiring mutagen dimethylnitrosamine markedly increased the frequency of somatic mutations in a double heterozygous chlorophyll mutant ofNicotiana tabacum, whereas exposure to N-methyl-N'-nitro-N-nitrosoguanidine was ineffective.

Comparison of esterase isoenzymes and protein patterns inAllium montanum F. W. Schmidt from various localities

Věra Hadačová, Věra Turková, Eva Klozová, Květa Pitterová

Biologia plantarum 1985, 27:28 | DOI: 10.1007/BF02894629

Populations ofAllium montanum from 6 localities in Czechoslovakia show a certain variability, but no correlation between their mutual affinity and geological substrate, climate or altitude above sea level.

The effect of some salts and osmotic shock on phosphate uptake in maize roots

Ivana Macháčková, Z. Zmrhal

Biologia plantarum 1985, 27:34 | DOI: 10.1007/BF02894631

Chlorides, nitrates, and sulfates of alkali metals, ammonium, calcium, and magnesium inhibit P_i uptake into maize root cortex segments. The concentration 100 mM brought about 50-100% inhibition, whereas 10 mM concentration (with the exception of salts of NH₄+, Ca²⁺, Mg²⁺) about 15-55%. Also potassium benzenesulfonate (100 mM) dramatically decreases P_i uptake.
Osmotic shock also inhibits P_i uptake. Marked decrease of P_i uptake ability proceeds in concentration range 0.12-0.13 M NaCl. Concomitantly, proteins are released into rehydration medium and their amount is proportional...

Seasonal changes in the photosynthetic response ofMercurialis perennis plants from different light regime conditions

Elena Masarovičova, P. Eliáš

Biologia plantarum 1985, 27:41-50 | DOI: 10.1007/BF02894633

Curves relating net photosynthetic rate to irradiance [P(I) curve relation] were estimated and analysed inMercurialis perennis L. plants stemming from three forest (spruce, beech and ash) stands with different tree leaf canopy development and different light regime.
The saturating irradiance (I_s) reached the highest values in plants of all three stands in spring (spruce forest: 438 W m^-2, beech forest: 440 W m^-2 and ash forest: 367 W m^-2), it declined sharply in the middle of the growing season (283, 285 and 297 W m^-2, respectively) and this I_s level persisted until autumn....

Some aspects of sucrose transport and utilization in latex producing bark ofHevea brasiliensis Muel. Arg

J. Tupý

Biologia plantarum 1985, 27:51 | DOI: 10.1007/BF02894634

The radiotracer technique is described for transport and metabolic studies in latex producing bark. This technique provided further evidence that carbohydrates are supplied to latex vessels as sucrose and that sucrose is readily used for rubber synthesis. Bark treatment with ethylene resulting in latex flow stimulation is shown to activate within a few hours sucrose and water transport into the latex vessels. The available knowledge suggests an implication of an energy-dependent process of proton excretion which could explain the earlier observed ethylene induced alkalization of latex cytosol enhancing invertase and sucrose utilization.
An increase...

Book review

Jarmila Solárová, Dagmar Dykyjová

Biologia plantarum 1985, 27:77-78 | DOI: 10.1007/BF02894640

Genetic control of environmental pollutants

T. Gichner

Biologia plantarum 1985, 27:9 | DOI: 10.1007/BF02894625

Dryland agriculture

Jarmila Solárová

Biologia plantarum 1985, 27:21 | DOI: 10.1007/BF02894627

IARC Monographs on the Evaluation of the Carcinogenic Risk of Chemicals to Humans. Volume 32. Polynuclear Aromatic Compounds, Part 1, Chemical, Environmental and Experimental Data

T. Gichner

Biologia plantarum 1985, 27:33 | DOI: 10.1007/BF02894630

Gaseous Air Pollutants and Plant Metabolism

Jarmila Solárová

Biologia plantarum 1985, 27:40 | DOI: 10.1007/BF02894632

Einführung in die Limnologie

Z. Šesták

Biologia plantarum 1985, 27:69 | DOI: 10.1007/BF02894636

Plant Tissue Culture: Theory and Practice

V. Žárský

Biologia plantarum 1985, 27:73 | DOI: 10.1007/BF02894638

Effect of NaCl and PEG 6000 on germination and seedling growth of rice (ryza sativa L.)

R. Bal, N. C. Chattopadhyay

Biologia plantarum 1985, 27:65 | DOI: 10.1007/BF02894635

Germination and seedling growth of rice was studied in NaCl and PEG 6000 solutions having osmotic potentials -0.2, -0.4, -0.6 and -0.8 MPa.
At isoosmotic concentrations, the NaCl proved more harmful to germination, seedling growth, per cent moisture content of seedling organs as well as mobilization of food matter from seed to the growing seedlings. This fact suggested that in rice, at least in the early stage, a specific ion effect rather than osmotic effect is the prime cause of salt injury. Compared to susceptible cultivar, the tolerant one was less inhibited by salinity.

Comparison of seed proteins in some representatives of the genusVigna

Věra Turková, Eva Klozová

Biologia plantarum 1985, 27:70 | DOI: 10.1007/BF02894637

Seed protein patterns were compared in 10 species of the genusVigna, and in the generaMacroptilium, Strophostyles, Macrotyloma, Psophocarpus andPhaseolus. ThreeVigna groups could be clearly separated using immunochemical methods:Vigna hosei andVigna luteola;Vigna mungo, Vigna angularis, Vigna umbellata, Vigna trilobata andVigna radiata;Vigna sinensis,Vigna unquiculata andVigna aconitifolia.
Among the other investigated generaPsophocarpus appears to be very distant, the others showing partial similarity in seed protein patterns.

Sucrose synthesis in callus cultures

S. Hisajima, Y. Arai, T. A. Thorpe

Biologia plantarum 1985, 27:74-77 | DOI: 10.1007/BF02894639

Occurrence and operation of sucrose synthetic system in randomly selected callus cultures such as persimmon, soybean and poplar cultures were examined by¹⁴C-tracer analysis and determining enzyme activities involved in sucrose metabolism. All the enzymes examined were present and¹⁴C-glueose was transformed into¹⁴C-sucrose in every callus. Sucrose synthetic capacity appears to be widely distributed in cultured plant tissues.

In memoriam of Professor Pierre Chouard

J. Krekule

Biologia plantarum 1985, 27:80 | DOI: 10.1007/BF02894642

International symposium on nuclear techniques and in-vitro culture for plant improvement Vienna, Austria 19-23 August 1985

Biologia plantarum 1985, 27:79 | DOI: 10.1007/BF02894641