Wyniki wyszukiwania - Biblioteka Nauki

Nowa wersja platformy, zawierająca wyłącznie zasoby pełnotekstowe, jest już dostępna.
Przejdź na https://bibliotekanauki.pl

Ograniczanie wyników

Znaleziono wyników: 2

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: tuberous root

Sortuj według:

Ogranicz wyniki do:

The influence of growth regulators on dahlia propagation in tissue culture and acclimatization of plants in ex vitro conditions

100%

Marcinek B. , Parzymies M. , Poniewozik M. , Kozak D. , Durlak W.

nr 5

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.

Grzyby zasiedlajace system korzeniowy dalii [ Dahlia x Hybrida Hort.]

51%

Bartynska M.

tom 31

3-10

Na podstawie badań wstępnych oraz 3-letnich doświadczeń ścisłych wykazano, że główną przyczyną zgnilizn korzeni bulwiastych dalii w okresie ich przechowywania są grzyby, a wśród nich gatunki: Fusarium culmorum, F. oxyspurum, F. oxysporum var. orthoceras Skład gatunkowy i częstotliwość występowania zidentyfikowanych grzybów w materiale rozmnożeniowym zależy w dużej mierze od rodzaju zastosowanego fungicydu.

In this paper author presents the results of field and laboratory investigations on the mycoflora inhabiting the dahlia rootstock. It was found (hat several species of Fusarium (F. culmorum, F. oxysporum, F. oxysporum var. orthoceras) are the main cause of poor healthiness of dahlia rootstock. The mentioned species cause the dry root during winter storage. The drying up of rootstock is precipitated by facultative parasites: Acremonium, Alternaria, Botrytis, Cladosporium, Gliocladium, Stemphyllium. Trichoderma, The effective reduction of fungi diversity and frequency of their occurrence during winter storage can be achieved by means of systemic fungicides applied in two terms: after digging out in autumn and before planting in spring.