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Grzyby zagrazajace Acidanthera bicolor Hochst.

100%
In the years 2000–2002 a mycological analysis was made of the corms of Acidanthera bicolor Hochst. meant for setting up experiments, and the roots, corms and leaves of plants at anthesis. The mycological analysis of corms before planting showed that they were infected by Al-ternaria alternata, Botrytis cinerea, Fusarium spp. and Penicilliumspp. In the period of vegetation the roots and corms were mainly infected by F. oxysporum, F. culmorum, F. solani and B. cinerea. On the other hand, the leaves of the studied plant were mostly infected by A. alternata and B. cinerea.
The aim of the work was to evaluate the influence of cytokinins on in vitro propagated dahlia and their consequent effect on acclimatization. Plant material consisted of shoot tips and nodes. Among the three cytokinins, benzyladenine, kinetin and 2-isopentenyl-adenine, only BA effectively stimulated the shoot multiplication from axiliary buds. The highest multiplication rate was obtained from nodes in the presence of 0.25– 0.5 mg·dm–3 BA. Higher concentrations shortened the internodes and decreased the leaf blades and growth of callus. 1 mg·dm–3 of KIN and 2iP positively influenced the shoot growth and size of leaves. Gibberellic acid (GA3) used with BA increased the number of auxillary shoots. The best quality shoots and the highest multiplication rate were obtained when 2 mg·dm–3 BA was used with 5 mg·dm–3 GA3. Cytokinins affected the rooting and acclimatization ex vitro. Dahlia shoots multiplicated in the presence of 1 mg·dm–3 KIN or 2iP rooted faster in the soil and 100% survived in field, while those from 1 mg·dm–3 BA media rooted slowly, had shorter shoots and only 60% of them survived. Plants bloomed after 11–12 weeks in the field. Dahlia plants that had been multiplicated in the presence of KIN had larger diameter and fresh weight in the field. BA and 2iP positively influenced the flower diameter, length of flower stalk and a number of the first-order shoots.
The investigations were based on the results on field experiment carried out in the years 2003-2005 in Podkarpackie Region. The experiment was performed by the method of randomized blocks in 3 replications on three sweet potato cultivars: Carmen Rubin, Goldstar and White Triump, obtained by the in vitro micropropagation. Organic and mineral fertilization was maintained on the constant level (25 t FYM, N - 100 kg, P - 43.6 kg, K - 124.5 kg·ha⁻¹). Reproduction material comprised rooted seedlings of Ipomoea batatas obtained from in vitro micropropagation. The biological value of tubers was high. The level of dry matter content, the sum of sugars and reducing sugars excided the values obtained in tuber crops, so far cultivated in Poland such as potato. The differences in the tuber chemical composition were conditioned by phenotypical variability.
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