Biologia plantarum, 1962 (vol. 4), issue 4

Article

Anlage und Entwicklung mixoploider Seitenwurzeln

Bohumil Nèmec

Biologia plantarum 1962, 4:261 | DOI: 10.1007/BF02933175

Wenn wir eine Keimwurzel der Puffbohne (Vicia faba L.) mehreremale nacheinander chloralisieren, entsteht in der Aussenschicht des Pleroms und in der Innenschicht des Periblems eine grosse Anzahl polyploider Zellen, die ein unregelmässiges Mosaik bilden, aus welchem ein transversales Meristem mixoploider Seitenwurzeln entsteht. An der Entstehung einer jeden von ihnen beteiligen sich durchschnittlich ungefähr dreissig Zellen und als Folge ihrer Tätigkeit durch-laufen die Wurzel neben diploiden noch einige polyploide Stränge oder Sektoren. Die Initialen der Seitenwurzeln können zweiseitig wie ein Kambium wirksam sein oder einseitig Zellen nur für die...

Changes in the amino acids content of almond buds during their hibernation and development

V. O. Kazaryan, K. A. Karapetyan

Biologia plantarum 1962, 4:269 | DOI: 10.1007/BF02933176

The authors submit the results of a chromatographic determination of free amino acids and protein fractions, soluble in ethanol and alkali, and insoluble, in the flower and vegetative buds of two almond varieties showing a different frost-resistance i.e. Non-plus-ultra and Vochtchaberdi. The buds were removed at different times between autumn (20.9.59) and spring (31.3.60). The Chromatographie determination of amino acids in buds showed the following:
1. During the autumn-winter season there is a clearly perceptible difference in the content and pattern of amino acids of almost all fractions in flower and vegetative buds. The sharpest difference...

Free amino acids and amides in the buds, and amino acids in hydrolyzates of the buds of biennial fruit-bearing apple trees

Josef Sahulka

Biologia plantarum 1962, 4:278 | DOI: 10.1007/BF02933177

The buds remowed from the fruit-bearing cluster bases of trees with fruit had a higher concentration of free asparagine and of some free amino-acids than the buds taken from trees without fruit. The quantitative relationship between amino acids in the hydrolyzates of the buds from the trees with and without fruit was very similar.

The influence of pruning on the diurnal variation in the concentration of plastic substances in the leaves ofRhus aromatica L.

V. O. Kazaryan

Biologia plantarum 1962, 4:283-290 | DOI: 10.1007/BF02933178

The present investigations were designed to explain the physiological causes of the increase in metabolism and growth in the shrubRhus aromatica L. after pruning. The determination of the concentration of the different forms of nitrogen compounds, of sugars, organic acids, phosphorus and also of the dry weight of the leaves from the pruned and from the control plants at different times during 24 hours, showed that the positive influence of the pruning on plants is due to the increase of the amplitude and of the synthesis and transport of organic substances from the leaves as well as of the transport of the minerals and water into the leaves.

The content of nitrogen and free amino acids in the spurs of annually and biennial bearing apple trees and the problem of their relation to flower-bud initiation

Josef Sahulka

Biologia plantarum 1962, 4:291-305 | DOI: 10.1007/BF02933179

The cluster bases (bourses) in each case had a higher content of total nitrogen and both absolute and relative soluble organic nitrogen than the new secondary growth of cluster bases on trees both with fruit and without fruit than new spurs on trees with fruit. This higher content of total and soluble nitrogen is primarily a feature of the organ and has no connection with the initiation of flower buds. The secondary growth of cluster bases on the trees with fruit never had a significantly higher content of soluble nitrogen than the new secondary growth of cluster bases and new growth of spurs on trees without fruit. In all apple varieties observed...

Water saturation deficit in the wilting plant. The preference of young leaves and the translocation of water from old into young leaves

Jiří Čatský

Biologia plantarum 1962, 4:306-314 | DOI: 10.1007/BF02933180

1. The differences in the dynamics of the origin and further development of the water saturation deficit (WSD) in leaves of different age from 100- to 120-day-old plants of fodder cabbage and rape were investigated.
2. WSD in leaves of different age detached from plants and wilting without water supply develops most quickly in young and most slowly in old leaves. This is in basic agreement with differences in transpiration rate.
3. When entire plants are cut off, leaves of different age wilt at the same rate. In the later phases of wilting, (i.e. at a WSD value of over 20 to 30%) slightly higher WSD values were found in old leaves.
4. During...

Study of the metabolism of exogenous tryptophane in the apple-tree and the estimation of bound tryptophane in apple and pear seeds

L. Chvojka, L. Trávníček, J. Chaloupka, L. Říhová

Biologia plantarum 1962, 4:315-318 | DOI: 10.1007/BF02933181

Seeds of apple and pear trees were found to contain 0-5-0-7% tryptophane expressed per dry weight. The hydrolyzate of the seeds contained tryptophane demonstrable microbiologically. Exogenous tryptophane applied to apple-tree shoots toward the end of the vegetation season gives rise to a new compound. Its R_F in isopropanol : ammonia : water (10 : 1 : 1) was found to be 0.08, in butanol : acetic acid : water (4:1:5) 0.25.