Search Results

You are looking at 1 - 10 of 104 items for :

  • Corylus avellana x
Clear All
Free access

Salih Kafkas, Yıldız Doğan, Ali Sabır, Ali Turan and Hasbi Seker

( Rehder, 1947 ; Kasapligil, 1972 ; Mehlenbacher, 1991 ; Thompson et al., 1996 ). The commercially important European hazelnut ( Corylus avellana L.) is native to most of Europe, Turkey, and the Caucasus mountains, and wild populations can be found in

Free access

William M. Proebsting, Nahla V. Bassil and David A. Lightfoot

Propagation of Corylus avellana stem cuttings may be limited by either root initiation or bud abscission. We divided juvenile shoots of 3 varieties growing in layering beds in mid-July into 4 or 5 3-node cuttings with leaves at the upper two nodes, except that terminal cuttings had one expanded leaf. Cuttings were treated with 5 mM IBA in 50% EtOH, a mixture of A. rhizogenes strains A7 + 22 or left untreated. IBA and bacteria stimulated rooting of cuttings from all shoot positions. Rooting of the terminal cuttings (<50%) was less than that of the sub-terminal cuttings (>80%). Bud retention was <50% on terminal cuttings, nearly 100% on sub-terminal cuttings. Using juvenile stock plants of various varieties, sub-terminal cuttings treated with Agrobacterium or 5 mM IBA may yield 70-90% cuttings with both roots and buds, Agravitropic roots, characteristic of genetic transformation, were observed on Agrobacterium-treated cuttings. Dot blots probed for TL-DNA were negative, however.

Free access

William M. Proebsting, Nahla V. Bassil and David A. Lightfoot

Propagation of Corylus avellana stem cuttings may be limited by either root initiation or bud abscission. We divided juvenile shoots of 3 varieties growing in layering beds in mid-July into 4 or 5 3-node cuttings with leaves at the upper two nodes, except that terminal cuttings had one expanded leaf. Cuttings were treated with 5 mM IBA in 50% EtOH, a mixture of A. rhizogenes strains A7 + 22 or left untreated. IBA and bacteria stimulated rooting of cuttings from all shoot positions. Rooting of the terminal cuttings (<50%) was less than that of the sub-terminal cuttings (>80%). Bud retention was <50% on terminal cuttings, nearly 100% on sub-terminal cuttings. Using juvenile stock plants of various varieties, sub-terminal cuttings treated with Agrobacterium or 5 mM IBA may yield 70-90% cuttings with both roots and buds, Agravitropic roots, characteristic of genetic transformation, were observed on Agrobacterium-treated cuttings. Dot blots probed for TL-DNA were negative, however.

Free access

Paolo Boccacci, Roberto Botta and Mercè Rovira

The European hazelnut ( Corylus avellana L.) is one of the world's major nut crops. Its geographic distribution extends from the Mediterranean coast of North Africa northward to the British Isles and the Scandinavian Peninsula, and eastward to

Free access

Nahla V. Bassil, B.J. Rebhuhn, David W.S. Mok and Machteld C. Mok

Development of optimum protocols for micropropagation of C. avellana is particularly important due to the threat of Eastern Filbert Blight and the need for rapid increase of resistant varieties and advanced selections. Therefore, efforts were directed at in vitro establishment, multiplication and rooting, starting with buds from mature trees. The frequency of shoot formation from buds was highest in August but varied with the genotype. Medium containing high Ca levels was more effective in preventing bud necrosis than MS medium. Multiplication rates of 4-7 new shoots/propagule were obtained over a 6-week culture period. Rooting of some genotypes could be accomplished by inclusion of 1 or 3 μM β- indolebutyric acid (IBA) in the medium. Other genotypes responded better to a dip of shoot bases in 1-10 mM IBA for 10 sec., followed by a passage on auxin-free medium. Large numbers of healthy plantlets have been produced for transfer to soil.

Free access

Xiaoling Yu and Barbara M. Reed

Multiplication and elongation of shoot cultures established from mature trees of hazelnut cvs. Nonpareil and Tonda Gentile Romana were affected by changes in basal medium, carbon source and concentration, cytokinin and agar concentration. Explants on DKW medium produced significantly more shoots than those on Anderson medium or modified woody plant medium for chestnut. Explants on DKW medium with 3% glucose or fructose gave more and longer shoots than those with the other carbon sources. Cytokinins 6 benzylaminopurine (BA) and zeatin were more effective in producing shoots than kinetin and 2iP. On BA supplemented medium, the best multiplication rate was obtained with 1.5 - 2.0 mg/l. Explants grown on 0.4% agar produced more shoots than those on 0.6%, however, prolonged culture on 0.4% agar caused vitrification of lower parts of the plants. Shoot multiplication rates of these two cultivars were similar, but `Nonpareil' produced longer shoots than `Tonda Gentile Romana'.

Free access

Kahraman Gürcan and Shawn A. Mehlenbacher

, and L022), and 6 B . pendula primer pairs were from Truong et al. (2005) (L1.10, L2.5, L021, Bo.F394, Bo.F330, and Bo.G182). Primer pairs developed from enriched libraries of Corylus avellana ( Bassil et al., 2005a , 2005b ; Boccacci et al

Free access

Thomas J. Molnar and John M. Capik

Hazelnuts ( Corylus avellana ) are a major tree nut crop ranking fifth in world production behind cashews ( Anacardium occidentale ), almonds ( Prunus dulcis ), walnuts ( Juglans regia ), and chestnuts ( Castanea sp.). The top hazelnut

Free access

John M. Capik and Thomas J. Molnar

. In this study, a wide diversity of clonal Corylus accessions, including pure species and various interspecific hybrids of C. avellana , C. americana , C. heterophylla , C. colurna , and C. fargesii, were exposed to A. anomala in New Jersey