Szerző szerinti böngészés "Balla, I."

Megjelenítve 1 - 3 (Összesen 3)
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    Nutrition of the micropropagated fruit trees in vitro and ex vitro
    (2003-06-24) Balla, I.; Vértesy, J.; Végváry, Gy.; Szűcs, E.; Kállay, T.; Vörös, I.; Bíró, B.
    Some experience or details are introduced in connection with the nutrient uptake of micropropagated fruit trees in the different phase of the in vitro or ex vitro development. It can be stated, that the plants during the micropropagation procedure are overfed. Special careful nutrient supply is necessary during the acclimatization.
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    The role of rejuvenated and adult forms of English oak (Quercus robur) in in vitro cultures
    (1999-05-24) Végvári, Gy.; Balla, I.; Kothencz, Z.
    In vitro plant material of clones (Q. robur) NL 100 A (adult) and NL 100 R (rejuvenated) received from Germany (A. Meier-Dinkel, 1995) were used in these experiments. WPM medium was used for the multiplication phase. Plantlets were subcultured monthly. Differences in quality and colour of the adult and rejuvenated cultures induced us to follow and compare the changes of mineral- and chlorophyll content and dry weight during the propagation phase. Mineral and chlorophyll content as well as dry weight were measured weekly on three samples during the subculture period. In the case of propagation rates we stated, they were similar around the year, but both clones had a high peak in April. Examining the cation-content, we detected that, the plantlets had a highest quantity of several elements during the 2nd and 3rd week of subculture. The iron content was the highest in the 1st week and after that it decreased continuously. It is supposed, that the content of iron is not enough in the media. The chlorophyll content of the rejuvenated clone was higher than that of the adult one. In the rooting experiments it was stated that, after one-week cold treatment the rooting ability was the best.  
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    Testing the virulence of some Hungarian Erwinia amylovora strains on in vitro cultured apple rootstocks
    (2000-08-23) Hevesi, M.; Papp, J.; Jámbor-Benczúr, E.; Kaszáné Csizmár, K.; Pozsgai, I.; Gazdag, Gy.; Balla, I.
    A useful method was improved to test and to evaluate the susceptibility of plants to fire blight and the virulence of E. amylovora strains. Six Hungarian strains from different host plants were tested on in vitro cultured apple rootstocks. Disease rating was used for the characterization of the process of disease development. The different strains had different capacity to cause disease, mainly in the first period of incubation. There were significant differences between the virulence of the strains.