Biologia plantarum, 1969 (vol. 11), issue 3
Article
Integrant characteristics in the deflexion of biserial buds in pea seedlings
R. Dostál
Biologia plantarum 11:193, 1969 | DOI: 10.1007/BF02920797
The main epicotyledonary axis inPisum sativum exhibits a very fluctuating either left- or right-handed deflexion of its first-order laterals, but the biserial buds on the laterals of various further order reveal in this respect certain regularities according to their position on the seedling, their deflexion being very often adaxial in the vicinity of cotyledons, however, in more distant and therefore later produced laterals, as a rule, abaxial. The integrant characteristics of these relationships may become clear from their experimental shift with the aid of exogenous auxin increasing inhibitions as well as of triiodobenzoic acid blocking the...
Determination of relationships between water potential and water saturation deficit in leaf tissue
Jana Pospíšilová
Biologia plantarum 11:202, 1969 | DOI: 10.1007/BF02920798
The mutual relationship between the water potential and water saturation deficit (w.s.d.) was studied on samples of leaf tissue of fodder cabage. Definite values of water potential were obtained by long-term exposure of plant material to an atmosphere with definite constant pressure of water vapour. The resulting w.s.d. values were determined gravimetrically.Water saturation deficit varies indirectly with the water potential. This dependence was linear for values of water potential from -4.4 to -43.9 atm.Since the stabilization of equilibrum of water potential between the leaf tissue and surrounding atmosphere was very slow the relationship...
Role of growth regulators in differentiation processes of maize (Zea mays L.) organs
Z. Sladký
Biologia plantarum 11:208, 1969 | DOI: 10.1007/BF02920799
The following paper deals with the character of endogenous auxins and gibberellinlike substances in the maize tassel and ear primordia during differentiation. Using bioassay the character of substances extracted from tassel primordia, internodes below the tassel, ear primordia and stem base was determined and correlated with the course of morphogenesis and differentiation. A low level of auxins and a high content of gibberellin-like substances accompanies the differentiation of terminal tassel. The differentiation of an ear is associated with an increment in auxin content while the level of gibberellin-like substances decreases. The character of growth...
Influence of exogenous DNA on Ypenyl-treated chromosomes ofVicia faba L.
Jana Šlotová, Z. Karpfel
Biologia plantarum 11:216-225, 1969 | DOI: 10.1007/BF02920800
This paper is a study of the effect of exogenous DNA of different genetic origins on the repair of meristematic cells of primary roots ofVicia faba, damaged by 24 hour treatment with 0.01mm solution of Ypenyl. Both kinds of DNA,i.e. isologous and heterologous, stimulated cell proliferation which was decreased by the action of the radiomimetic and influenced both dynamics of production of chromosome aberrations and the interchromosomal distribution of induced damage. While heterologous DNA increased the frequency of aberrations after all recovery periods studied, isologous DNA significantly decreased the number of chromosomal aberrations....
Study of the effect of volatile substances from cereal roots
F. Plhák, Věra Urbánková
Biologia plantarum 11:226, 1969 | DOI: 10.1007/BF02920801
We traced the liberation and biological effect of volatile substances released from the roots of cereals,i. e. barley, wheat, rye and oats, on seedlings of the same and other plant species. Experiments were carried out in a closed glass apparatus with a static or circulating atmosphere in which the CO2 and O2 were permanently absorbed and supplemented, respectively. In some experiments the air was bubbled through water or through solutions of boric acid, barium hydroxide and potassium permanganate.The roots of all four cereals tested released volatile substances with a biological activity which appeared to be non-specific...
Trunk contraction ofHevea brasiliensis due to tapping
J. Luštinec, J. Simmer, W. L. Resing
Biologia plantarum 11:236, 1969 | DOI: 10.1007/BF02920802
Determination of bark contraction due to tapping made simultaneously at different positions on the trunk ofHevea trees (young PR 107, S/2 ↓) provided information about the flow area and the speed of contration spreading.The relation between truck contraction at the given distance from the cut and the amount of latex tapped was experessed in mathematical terms. A quantitative relation was also established between the yields of latex and the linear dimension of flow areas in longitudinal direction below the middle of tapping cut.From the contraction curves it is deduced that the lateral flow of latex becomes relatively more important...
Intracellular inclusions in epidermal cells of tobacco infected by tobacco rattle virus
Biljana Plavšić-Banjac, Z. Polák
Biologia plantarum 11:245, 1969 | DOI: 10.1007/BF02920803
Internal symptoms in epidermal cells of tobacco rattle virus infected tobacco were investigated. Ring-, elipsoid- and spindle-shaped inclusions were found in the period between the fourth and thirtieth day after inoculation of Samsun seedlings.
Epidermal structure and development of stomata in vegetative and floral organs ofHybanthus enneaspermus (Linn.)F. Muell
J. A. Inamdar
Biologia plantarum 11:248, 1969 | DOI: 10.1007/BF02920804
The present paper deals with the epidermal structure and ontogeny of stomata in vegetative and floral organs ofHybanthus enneaspermus. The epidermal cells are either polygonal or elongated with straight, sinuous or arched thick anticlinal walls. The surface of the cuticle shows parallel striations radiating from the guard cells or hair bases. Unicellular and uniseriate bicellular trichomes with verrucose margins have been observed on all organs. The mature stomata are anisocytic, paracytic, anomocytic and transitional between anisocytic and paracytic. The ontogeny of anisocytic and paracytic stomata is syndetocheilic or mesogenous, anomocytic...