Ograniczanie wyników

Czasopisma help
Autorzy help
Lata help
Preferencje help
Widoczny [Schowaj] Abstrakt
Liczba wyników

Znaleziono wyników: 24

Liczba wyników na stronie
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych:  grafting
help Sortuj według:

help Ogranicz wyniki do:
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
The aim of this study was to determine the graft performance and to follow the graft compatibility of Bornova Misketi, Trakya Ilkeren and Sultan 1 grape cultivars grafted on 5BB and 1103P rootstocks. Grafts were made by using omega technique. Following waxing, grafts were packed in plastic boxes filled up with fungicide humidified sawdust and chips (3:1) and were placed in callusing room (25°C, 85% relative humidity) for three weeks. Post callusing, grafts were evaluated for their callusing rate at graft union (0–4 scale), sprouting rate (%), rooting rate (%) and sapling yield (%). According to obtained data statistically significant differences were determined in all parameters except sprouting rate. Graft samples were taken each month for histological analysis during six months following callusing. No significant differences were observed among combinations in respect to histological development of graft unions. Callusing rate (3.73/5 BB–3.70/1103 P) and potted sapling yield (86.66/5 BB%–90.00/1103 P%) were the highest in Bornova Misketi among all combinations for two rootstocks.
Grafting plays an important role in rhododendron propagation. Successful graft union depends on selection of a suitable stock, grafting season, and method. In this study, three methods (whip, cleft, and side grafting) were compared in two seasons. The stocks were mainly cuttings of R. catawbiense-Hybridum, R. ‘Cunningham's White', but also R. pachytrichum and R. brachycarpum. Scions were taken from several cultivars deriving from R. catawbiense. To shorten the production period, scions were grafted on unrooted stocks, and the results are encouraging. The best stock was R. ‘Cunningham's White', especially when side grafting was applied in spring.
Testing the globally popular grapevine rootstocks for affinity with new grape cultivars or tolerance potential to stress factors like drought is essential for districts where supplemental irrigation is more frequently needed due to the pressures of a global climate change. In this study, a seasonal evaluation of leaf gas exchange, leaf temperature, leaf greenness (chlorophyll content prediction) and vegetative development of Vitis vinifera L. cv. ‘Prima’ grafted to different rootstock genotypes having great variability in drought tolerance, were investigated. The experiment was conducted in a controlled experimental glasshouse on two-year-old soilless grown ‘Prima’ vines grafted on nine rootstocks [44-53 M, 5 BB, 140 Ru, Ramsey (Syn. Salt Creek), 99 R, Saint George (Syn. Rupestris du Lot), 41 B, 1613 C and 420 A]. A long-term deficit irrigation (DI) was imposed before bud break by reducing water supply to 40% of field capacity derived from concurrent measurements of water content of growth medium and maintained until the end of vegetation period. The rootstocks significantly modulated the physiology and vegetative growth of the scion cultivar in varying degrees according to their genetic features. Among them, 140 Ru rootstock found to be more prominent in terms of mitigating the adverse effect of water deficit on physiology and growth of the scion genotype ‘Prima’ as there were no significant difference between deficit and full irrigation treatments for most of parameters investigated. In general, the ‘Prima’ scion performed better when the rootstocks coming from V. berlandieri × V. rupestris pedigree rather than the others including V. berlendieri × V. riparia.
There is inadequate information on the application of rootstocks in the propaga­tion of pomegranate. The aim of this research was to study propagation of pomegran­ate using the stenting method. The experiment was conducted on the basis of a com­pletely randomised design (CRD) with two factors: rootstock (Rj, R2 and R3) and the concentration of indole-3-butyric acid (IBA) (0 and 500 mg/l), in three replications. The rootstocks were 'Gorj-e-Dadashi' (R1), 'Gorj-e-Shahvar' (R2) and 'Gool Safid-e- Ashk-e-Zar' (R3), and the scions were of the cultivarMalas-e-Yazdi. The results indi­cated that rootstock type and IBA treatment influenced bud-take and root formation. The highest bud-take percentage was obtained with R1 in combination with 500 mg/l IBA.
In the years 2011–2013 growth and yielding of four cultivars of sweet cherry trees: Burlat’, ‘Regina’, ‘Summit’ and ‘Vanda’ were evaluated. All of them were grafted on new Mahaleb rootstocks obtained through softwood cuttings selected from a population of German seedlings of ‘Alpruma’ type in comparison with Mazzard seedling. Additionally an analysis of genetic variability of newly studied biotypes of Mahaleb was conducted. The biggest trunk cross-sectional area had trees on seedlings of Mazzard and Mahaleb No.1, No.4 and No.5, and the smallest on Mahaleb No. 2, No. 3 and No. 6. The biggest volume of the crown had trees growing on Mazzard and the smallest on Mahaleb No. 2 and No. 6. Bigger crowns were also created by the trees of ‘Burlat’ and ‘Summit’ cultivars, and smaller ‘Regina’ and ‘Vanda’. Trees budded on Mazzard had fruits which were slightly lighter in comparison to Mahaleb rootstocks. Regina and Summit outstood other cultivars in terms of weight of fruits. The biggest sum of crops was obtained from trees budded on Mahaleb No. 6 and No. 2, and the smallest on Mazzard and Mahaleb No. 1 and No. 4. The most productive were ‘Vanda’ and ‘Summit’. The biggest productivity index was obtained for rootstocks of Mahaleb No. 6, No. 2, No. 3 and No. 5. For Mazzard and and Mahaleb No. 1 the value of this index was the smallest. Of all examined cultivars the best results was Vanda, then Summit. The analysis of electrophoretic profiles conducted with PCR-RAPD method showed a big genetic similarity between Mahaleb No. 2 and No. 6 and a big variability of the remaining biotypes of Mahaleb among each other. Out of six examined biotypes, Mahaleb No. 2 and No. 6 turned out to be the most productively valuable. Trees of sweet cherry on these rootstocks had the weakest growth, had relatively many flowers and fruits and were characterized with the biggest productivity index.
Studies were conducted at the Felin Experimental Station of the Agricultural University in Lublin in the years 2001–2003 and their aim was to estimate the effect of preparations Arbolin 036SL and Promalin 3,6 SL in the form of lanolin paste on the quality of two-year-old trees ‘Šampion’ and ‘Jonica’ cvs. grafted on rootstock M.26. It was shown that the greatest influence on the number of lateral shoots, sum of shoot length and their mean length was exerted by the cultivar and atmospheric conditions in a given year. It was observed that in the majority of trees more lateral shoots were formed by the trees after the application of growth regulators as compared to the control. A singular use of preparations stimulating the branching in the form of lanolin paste in the years with unfavourable weather conditions (2003) was not sufficient to obtain satisfactory effect. The genetic features of a cultivar and the weather conditions in the period of young shoots’ growth had a significant effect on the growth of the studied trees. Preparations Arbolin and Promalin in the form of lanolin paste had no significant effect on the diameter of the rootstock trunks.
The complete protocol for regeneration and long-term micropropagation of several Polish cultivars of pea (Pisum sativum L.) has been elaborated. The shoots were the most likely regenerated via de novo organogenesis. The adventitious buds formed in callus derived from cotyledons tissue adjacent to the axillary meristems of immature embryos. All cultivars' calli regenerated several shoots per explant on the MS medium supplemented with B5 vitamins and 4.5 mgl-1 of BAP, however some differences in regeneration capacity among cultivars were observed. The plantlets were subsequently micropropagated with slightly higher efficiency and preserving a good viability over the long-term culture on a medium containing 2.0 mgl-1 than one with 4.5 mgl-1 of BAP. The additional step of the pre-conditioning culture of multiplicated shoots on a medium with very low BAP concentration i.e. 0.02 mgl-1 was applied and appeared to be beneficial before rooting in vitro or grafting. The modified MS-derived medium with the half-strength of MS macroelements but with the full original dose of calcium and supplemented with B5 vitamins and 1.0 mgl-1 of NAA was developed for effective rooting. The shoots were also sufficiently transferred into ex vitro conditions using grafting. The majority of the regenerated plants had adapted to in vivo conditions in a greenhouse and subsequently has set seeds. The presented protocol provides relatively efficient rate of de novo pea regeneration and would be useful for Agrobacterium-mediated transformation purposes.
So far, experience in the existing clonal seed orchards of Douglas-fir indicates that grafts of this species are short-lived. According to research carried out in North America, incompatibility between the grafted scions and the rootstocks happens during the whole period of growth and development in clonal seed orchards of Douglas-fir. A similar phenomenon occurs in the clonal seed orchards of Douglas-fir in Poland. The extent of die-back of grafts was examined in three existing oldest units in the Forest District of Gniewkowo (founded in 1992-1993; 2.80 ha), the Forest District of Leżajsk (founded in 1995, 4.22 ha) and the Forest District of Łopuchówko (founded in 1993, 7.43 ha). In all these areas, losses due to die-back ranged from a dozen to a few dozen per cent. Die-backs in the clonal seed orchards in the Forest District of Gniewkowo and in the Forest District of Łopuchówko are now reduced to as much as about fourty per cent of grafts. Analyses of die-back in all these areas reveal great variation between individual clones, indicating its genetic basis. Research carried out so far has not demonstrated the presence of any pathogens responsible for causing the die-back in the grafts. Some hope to solve the problem mentioned above arises from attempts at autovegetative propagation of Douglas-fir.
Pierwsza strona wyników Pięć stron wyników wstecz Poprzednia strona wyników Strona / 2 Następna strona wyników Pięć stron wyników wprzód Ostatnia strona wyników
JavaScript jest wyłączony w Twojej przeglądarce internetowej. Włącz go, a następnie odśwież stronę, aby móc w pełni z niej korzystać.