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Felicitas Svejda : Scientist and rosarian
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Publications of Felicitas Svejda

Book cover of The Canadian Explorer Roses Felicitas Svejda is the author or a co-author of 39 articles published in scientific or specialized periodicals, as well as information factsheets and a book.

This is a partial bibliographic listing:


Bibliographic itemGfeller, F. & Felicitas Svejda, 1960.  Inheritance of post-harvest seed dormancy and kernel colour in spring wheat lines.

Canadian Journal of Plant Science, Vol. 40 (1, 1960): pp. 1-6.

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Bibliographic ItemSvejda, Felicitas, 1961.  Increased yield in advanced generations after X-irradiation of Pisum.

Journal canadien de génétique et de cytologie, Vol. 3 (2, 1961): pp. 195-203.

Yield tests carried out during three years at Ottawa showed that the average yield of the X, and X, derived from X-irradiation of presoaked seed from the pea variety 'Chancellor' was significantly higher than that of the control. Two bulked salmples of the X, were tested in 1958 at 10 locations across Canada. The average yield of these bulks was about 10 per cent higher than the yield of the original variety. It has been shown that the increase of the average yield was the result of a large number of higher yielding types in the population from X-irradiated seed. No direct relationship was found between yield and dose levels of X- irradiation with 2500r, 5000r and 10000r. The average yield of the X, originating from seed treated with l0000r was lower than from seed treated with 2500r, but higher than froin seed treated with 5000r. No explanation is offered for the exceptional frequency of higher yielders or for the relationship between yield and X-ray dose.

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Bibliographic ItemSvejda, Felicitas, 1966.  Investigations on the relationship between winterhardiness in roses and the electric impedance measured during the growing period.

Canadian Journal of Plant Science, 46(4, 1966) : pp. 441-448.

Differences were found in the electric impedance of rose cultivars and seedlings, measured periodically under greenhouse and field cultures. Generally, plants with the highest ranking means were also hardy, but the magnitude of the impedance was not strictly indicative of hardiness since hardy plants were found with relatively low impedances. Fluctuations in the weekly impedance measurements corresponded to the rise and fall of the air temperature. The impedance was negatively correlated to the temperature. Different impedance temperature regression coefficients were found for different cultivars and seedlings. It is not known how these temperature gradients should be interpreted biologically, but it is assumed that they are significant for the adaptation of plants.

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Bibliographic ItemSvejda, Felicitas, 1966.  William Baffin rose.

HortScience, vol. 18 (6, 1966)


Bibliographic ItemSvejda, Felicitas, 1968.  Effect of temperature and seed coat treatment on the germination of rose seeds.

HortScience, Vol. 3 (1968): pp. 184-185.


Bibliographic ItemSvejda, Felicitas, 1969.  Hybrid rugosa rose ‘Martin Frobisher’.

Canadian Journal of Plant Science, Vol. 49(1) : p. 100.

Martin Frobisher is a hardy shrub rose that blooms continuously from June until frost.

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Bibliographic ItemSvejda, Felicitas, 1970.  Further observations on the relationship between winterhardiness in roses and the electric impedance of uninjured tissues.

Canadian Journal of Plant Science, 50(4, 1970): pp. 493-497.

The magnitude of the electric impedance of woody plant tissue was not found to be indicative of winterhardiness, when measured on uninjured tissues during the growing period. This was shown by comparing the impedances between (a) hardy Rosa rugosa cultivars and tender R. chinensis cultivars, (b) R. rugosa cultivars of different hardiness levels of different parentage, and (c) seedlings of different hardiness levels but with a common maternal parent. The disagreement of these results with results of other workers is discussed. Earlier findings which indicated that the magnitude of the electric impedance characterizes certain plant genotypes were confirmed.

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Bibliographic ItemSvejda, Felicitas, 1972.  Water uptake of rose achenes.

Canadian Journal of Plant Science, 52(6, 1972): pp. 1043-1047.

Rose (Rosa rugosa Thunberg) achenes are water permeable. This was shown by the weight increases after immersion into a phosphate buffer. The imbibition curves were typical but, contrary to most imbibing seeds that swell, rose achenes do not increase in size. The water uptake of seeds of intact achenes is impeded. A comparison of intact achenes with achenes that were cut in half showed that the weight increase of cut achenes after immersion in the buffer was significantly higher (P < 0.01) and also that the penetration of stain into the embryos of cut achenes was significantly increased (P < 0.01) after immersion into a 1% eosin solution. The restricted water penetration into seeds of intact achenes is believed to be due to a reduction of the imbibition pressure, caused by an increased wall pressure.

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Bibliographic ItemSvejda, Felicitas & P. A. Poapst , 1972.  Effects of different after-ripening treatments on germination and endogenous growth inhibitors in Rosa rugosa.

Canadian Journal of Plant Science, Vol. 52 (1972) : pp. 1049-1058.

The concentration of growth and germination inhibitors in achenes from seedlings of R. rugosa Thunberg is reduced through leaching. Leaching of achenes for 24 hr before stratification increased the germination but the effect of leaching was not always significant. The presence of inhibitors was indicated between Rf 0.3–0.4 and Rf 0.7–0.9 by the retarding effect on radicle elongation of cress seeds (Lepidium sativum L. cult Moss Curled) when extracts of achenes were developed on ascending paper chromatograms (isopropanol:ammonia:water, 10:1:1, v/v). Changed concentrations of the inhibitor between Rf 0.7 and 0.9 from different after-ripening treatments did affect the germination of the achenes but the changed concentrations of the inhibitor between Rf 0.3 and 0.4 did not. Presumably, the inhibitor between Rf 0.7 and 0.9 was abscisic acid. Warm–cold treatments promoted germination more effectively than cold treatments. The most effective treatment was 4 weeks at 20 C and 8 weeks at 4 C. Both cold and warm–cold after-ripening seemed to promote germination through a reduction of growth inhibitors. Inhibitors do not control the germination of rose achenes exclusively because: (a) leaching reduced the concentration of inhibitors but it did not induce germination without after-ripening treatments; (b) partial after-ripening for 4 weeks at 20 C also reduced the concentration of inhibitors but it did not induce germination unless it was followed by an after-ripening period of 4 C; (c) after-ripened achenes germinated in spite of inhibitors.

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Bibliographic ItemSvejda, Felicitas, 1974.  Reproductive capacity of F1 hybrids from Rosa rugosa and Chinensis cultivars.

Euphytica, Vol. 23(3, November 1974) : pp. 665-669.

Reciprocal crosses were carried out for 6 combinations of 4 R. rugosa with 3 R. chinensis cultivars. The parental combinations were evaluated for successful pollinations, seed germination and flowering and seed setting seedlings in populations of 3 year old plants. Seeds and viable seedlings were obtained from each of the 12 seedling populations. Only 3 populations produced female fertile offsprings. The average of seed setting seedlings was 1.5%. The percentage of flowering seedlings was significantly reduced in the offspring from certain parents. The success of cross pollination, seed germination and the ability to initiate flowers were influenced by cytoplasmic factors.

The differences in fertility between the present hybrids and the only other rugosa x chinensis hybrid described, R. calocarpa (André) Willmott, are discussed.


Bibliographic ItemSvejda, Felicitas, 1975.  Hybrid rugosa rose cv. Jens Munk.

Canadian Journal of Plant Science, 55(1, 1975 ):pp. 335-336.

Jens Munk is a very hardy rose and flowers abundantly in June-July and again in August.

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Bibliographic ItemSvejda, Felicitas , 1975.  New approaches in rose breeding.

Horticultural Science, 10 (6, 1975): pp. 564–567.

Breeding programmes were devised with diploid and tetraploid cvs and spp. to obtain winter-hardy, repeat-flowering roses with resistance to blackspot (Diplocarpon rosae) and powdery mildew (Sphaerotheca pannosa). For the programme at the diploid level, cvs of R. rugosa were used as the source of hardiness and disease resistance, and cvs of R. chinensis as the source of everblooming habit and flower quality. (...)


Bibliographic ItemSvejda, Felicitas, 1976.  Breeding winter hardy and everblooming roses.

American Rose Annual, 61(1976) : pp. 16-22.

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Bibliographic ItemSvejda, Felicitas, 1977.  Breeding for improvement of flowering attributes of winterhardy Rosa kordesii Wulff hybrids.

Euphytica, Vol. 26 (3, December 1977) : pp. 703-708

The results from tetraploid hybrids of R. kordesii showed that flowering attributes can be improved by a suitable combination of modifying factors as was shown previously by investigations with diploid hybrids from R. rugosa. A longer flowering period than 7 weeks indicated always the ability for recurrent bloom in these investigations but a shorter flowering period did not always indicate non-recurrent bloom.

The offspring from the cross of the recurrent R. kordesii with the non-recurrent seedling G12 segregated into non-recurrent and recurrent types in a ratio of 3:1 for a tetrasomic inheritance, assuming a duplex segregation and complete dominance.

The flowering attributes could be improved without loss of a high level of winterhardiness.


Bibliographic ItemSvejda, Felicitas, 1979.  Inheritance of winterhardiness in roses.

Euphytica, Vol. 28 (2, June 1979): pp. 309-314

Heritability in the broad sense and the distribution of levels of winterkill were analyzed in the offspring from hardy diploid and from hardy, semi-hardy and tender tetraploid roses. The heritabilities for different parental combinations ranged from 51 to 92%.

The offspring from crosses of hardy parents were also hardy and showed little variation in hardiness levels.

The offspring from crosses of hardy roses with the semi-hardy R. kordesii and the tender 'Queen Elizabeth' survived the winters without coverage but showed a wider variation in hardiness levels. The desirable level of hardiness, an average winterkill of less than 10%, could be achieved through selection in the first or second generation of breeding, depending on the hardiness levels of the parents. The hypothesis is advanced that winterhardiness in roses is controlled by very few or closely linked genetic factors.


Bibliographic ItemBolton, A. T. & Felicitas Svejda, 1979.  A new race of Diplocarpon rosae capable of causing severe black spot on Rosa rugosa hybrids’.

Canadian Plant Disease Survey, Vol. 59 (2, 1979) : pp. 38-41.

In 1977, severe black spot symptoms appeared at Ottawa on the highly resistant Rosa rugosa hybrid cultivar Martin Frobisher, and on an unidentified Rosa species collected at Bar Harbor, Maine. The Diplocarpon rosae Wolf isolated from Martin Frobisher was unable to infect the very susceptible cultivars Samantha and Arthur Bell. The isolate of D. rosae from the unidentified Rosa sp. was capable of producing severe symptoms on Martin Frobisher and the two susceptible cultivars. It was concluded that the isolate from Martin Frobisher constituted a new pathogenic race of the fungus. The possibility of the highly virulent isolate from the unidentified Rosa sp. constituting a pathogenic race is considered.

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Bibliographic ItemSvejda, Felicitas & A. T. Bolton, 1980.  Resistance of rose hybrids to three races of Diplocarpon rosae.

Canadian Journal of Plant Pathology, Vol. 2 (1, 1980) : pp. 23-25


Bibliographic ItemSvejda, Felicitas, 1982.  Minuet weigela.

Canadian Journal of Plant Science, Vol.62 (1): pp. 249-250.

Minuet is a hardy, attractive, dwarf, freely flowering, Weigela florida cultivar.

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Bibliographic ItemSvejda, Felicitas, 1984.  'Rugosa Ottawa', a source for insect and disease resistance in roses.

HortScience, Vol. 19 (6, 1984) : pp. 896-897.

The strain of Rosa rugosa from which Rugosa Ottawa was derived originated from seeds collected at Abashiri, Hokkaido, Japan. Rugosa Ottawa combines high levels of mite, insect and disease resistance, including resistance to Tetranychus urticae, Chaetosiphon fragaefolii, Diplocarpon rosae and Sphaerotheca pannosa.


Bibliographic ItemSvejda, Felicitas, 1984.  Nouveaux cultivars de rosiers résistants au froid et autres arbustes à fleurs = New winter-hardy roses and other flowering shrubs. 2e éd. / 2nd ed.

Ottawa : Agriculture Canada. 1 brochure n. p. (Publication 1726)

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Bibliographic ItemSvejda, Felicitas, 1984.  Canadian Explorer roses.

American Rose Annual, 69 (1984) : pp. 70-82.

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Bibliographic ItemSvejda, Felicitas, 1988.  John Davis and J. P. Connell roses.

HortScience, Vol. 23 (4, 1988) : pp. 783-784.


Bibliographic ItemSvejda, Felicitas, 1988.  Rose germplasm L83.

HortScience, vol. 23 (2, 1988) : pp. 415-416.


Bibliographic ItemSvejda, Felicitas, 2008.  The Canadian Explorer roses.

London, ON : National Roses Canada. 58 p.



These documents are available for consultation in their original printed version
at the Montréal Botanical Garden Library.

Exposition Svejda [Jardin botanique de Montréal]

CREDITS


Last update : 2016-10-01
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