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Samir Debnath*

The morphological development of lingonberry (Vaccinium vitis-idaea L.) plants propagated either by conventional softwood cuttings or by in vitro shoot proliferation from nodal explants or by shoot regeneration from excised leaves of micropropagated shoots, was studied in cultivars `Regal', `Splendor', and `Erntedank'. Significant differences were observed between the treatments. In vitro-derived plants produced more shoots branches and rhizomes in contrast to conventional cuttings which rarely produced rhizomes. Plants propagated from cuttings had a lower number but vigorous shoots and thicker rhizomes than in vitro-derived plants. Source propagule had significant effect on multiplication rate. Another experiment evaluated the effect of indole-3-butyric acid (IBA) application to softwood cuttings on subsequent rooting, shoot development, and rhizome production. Treating cuttings with IBA did not significantly improve rhizome formation and elongation. In vitro culture on nutrient medium apparently induces the juvenile branching characteristics that favored rhizome production. The advantage of rhizome production of in vitro-derived plants over stem cuttings varied among genotypes.

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Samir C. Debnath

The growth and development of lingonberry (Vaccinium vitis-idaea L.) plants propagated either by conventional softwood cuttings or by in vitro shoot proliferation from nodal explants and by shoot regeneration from excised leaves of micropropagated shoots, were studied in cultivars `Regal', `Splendor', and `Erntedank'. Significant differences were observed between the treatments. After 3 years of growth, the in vitro-derived plants produced more stems, leaves, and rhizomes than the conventional cuttings which rarely produced rhizomes. In vitro culture on nutrient medium apparently induces the juvenile branching characteristics that favor rhizome production. This increase in vegetative growth and rhizome yield of in vitro-derived plants over stem cuttings varied among genotypes.

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Marvin Pritts and Dorcas Isuta

Previous findings reveal that rooting and acclimatization of apple and blueberry plants is often difficult, inconsistent and inefficient. This experiment was set up in a fog chamber lo investigate the effects of CO2 enrichment (CDE) and irradiance on unrooted stage II microshoots. Two CO2 and 3 light levels tested were: 1350 +/- 150 (+ CDE), and 450 +/- 50 (- CDE) ppm; 30 +/- 5 (low), 55 + 10 (medium), and 100 + 20 (high) umolm-2s-1 respectively. Cultivars assessed were Berkeley and Northsky for blueberry. G65 and NY30 for apple. Blueberry microshoots acclimatized successfully and gave between 90 to 100% rooting and survival rate. Apple microshoots acclimatized and rooted slowly, exhibited great sensitivity to in vivo conditions and gave between 40 to 100% rooting and survival rate. High light induced photo-inhibition which disappeared after complete acclimatization. There was a significant difference between low light and the other two light levels. The effect of CDE was dependent on cultivar. In most cases, high light (-) CDE gave the most vigorous growth (highest plant dry weight and leaf area). There was a significant difference between (+) CDE and (-) CDE at low and medium light, but none at high light. Low light (-) CDE and medium light (+) CDE were superior over low light (+) CDE and medium light (-) CDE. respectively. Stalling out in apple microshoots was corrected by GA sprays.

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M.A. Norton and R.M. Skirvin

Chimeral `Thornless Evergreen' (CTE), (Rubus laciniatus Willd.) somaclones selected in 1983 and field planted in 1985 were reexamined in 1992 for various vegetative and reproductive characteristics. Two major types of thornless (prickle-free) plants, intermediate-sized (`UI 6-6' = `Everthornless') and dwarf (`UI 6-4'), originally selected from a chimeral thornless parent plant, were compared with thorny plants. The intermediate and dwarf somaclones have maintained their distinctive habits over 7 years' growth in the field, indicating that their growth habits are stable and not a transient effect of tissue culture. Although the thornless somaclones remained thornless, the degree and type of prickle-like structures varies considerably, indicating that the thornless gene (S te) does not entirely suppress the production of prickles, but apparently alters their development. Increasing suppression was directly related to increasing dwarfism, suggesting a link between thornlessness and internode length.

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Lawrence W. Zettler, Sarah B. Poulter, Kris I. McDonald, and Scott L. Stewart

of transplanted seedlings ex vitro ( Anderson, 1991 ; Ramsay and Dixon, 2003 ), and it is conceivable that the same could be true for epiphytes. Moreover, the act of releasing mycotrophic seedlings in situ could also result in the release of suitable

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Jin Cui, Juanxu Liu, Min Deng, Jianjun Chen, and Richard J. Henny

ex Fr.) has become the most common disease of arrowhead vine. This opportunistic airborne fungal pathogen particularly occurs during the ex vitro rooting of microcuttings after shoot culture because the cutting base is especially susceptible to this

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Dongliang Qiu, Xiangying Wei, Shufang Fan, Dawei Jian, and Jianjun Chen

shoot organogenesis. Microcuttings derived from adventitious shoots of a cultivar were evaluated for both in vitro and ex vitro rooting. Results suggest that the developed protocols could be used for micropropagation, genetic transformation or both of

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Seong Min Woo and Hazel Y. Wetzstein

acclimatized over 4 weeks. Two months after transplanting, plants were transferred to the greenhouse. Additional studies were conducted to evaluate ex vitro rooting. Shoots 2 to 4 cm long were harvested from cultures in shoot elongation medium. The base of 48

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Todd J. Rounsaville, Darren H. Touchell, Thomas G. Ranney, and Frank A. Blazich

Mahonia have been successfully achieved both in vitro and ex vitro using a variety of auxins. Mackay et al. (1996) achieved nearly 100% rooting of M. trifoliata in vitro using 1.0 μM naphthaleneacetic acid on cultures younger than 6 months. However

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Michael W. Bairu, Manoj G. Kulkarni, Renée A. Street, Rofhiwa B. Mulaudzi, and Johannes Van Staden

abnormal. Statistical analysis. Ex vitro results were analyzed using MINITAB® release 14 statistical package (Minitab Inc., State College, PA). One-way analysis of variance was conducted to test Fisher's significance level at 5%. Percentage germination data