INTERSPECIFIC HYBRIDIZATION IN LOBELIA L. SECTION LOBELIA

1961 ◽  
Vol 39 (7) ◽  
pp. 1679-1693 ◽  
Author(s):  
Wray M. Bowden
Keyword(s):  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
Natural Hybrid ◽  
Negative Results

The results of about 1400 pollinations that involved the 21 species of Lobelia L. sect. Lobelia are reported. The bispecific combinations that gave positive or negative results are recorded. Thirty-three different species combinations are represented in the artificial interspecific hybrid populations. Two of these hybrids have been reported by previous authors.Lobelia × rogersii hybr. nov. (L. brevifolia × L. puberula) is described. Numerous natural hybrid specimens were examined and the parentage was confirmed experimentally. Some plants of L. × rogersii were pollen-sterile; other plants were partly self-fertile.

Natural interspecific hybridization between sexual and apogamous species of the beech fern genus Phegopteris Fée

1972 ◽  
Vol 50 (6) ◽  
pp. 1295-1300 ◽  
Author(s):  
Gerald A. Mulligan ◽  
Lionel Cinq-Mars ◽  
William J. Cody
Keyword(s):  
North America ◽  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
Genetic Material ◽  
Female Gamete ◽  
Eastern North America ◽  
Natural Hybrid ◽  
Sexual Species

A clone of beech fern found growing on a mountain near Rougemont in Rouville County of Quebec is shown to be a natural hybrid between two species of Phegopteris that grow together at that location, the circumboreal species P. polypodioides Fée and a species endemic to eastern North America, P. hexagonoptera (Michx.) Fée. Phegopteris polypodioides is shown to be an apogamous triploid (2n = 90), P. hexagonoptera a sexual diploid (2n = 60), and the interspecific hybrid between these two species an apogamous tetraploid (2n = 120). It was concluded that the natural hybrid was produced by the union of a motile gamete, containing 90 chromosomes, from an antheridium on a prothallus of apogamous P. polypodioides with a female gamete, containing 30 chromosomes, on a prothallus of sexual P. hexagonoptera. This is the second report of interspecific hybridization between sexual and apogamous species of ferns. The morphology of both parents and the hybrid supports the conclusion that the apogamous species contributed more genetic material to the hybrid than did the sexual species. It is suggested that this hybrid probably occurs at other locations where the ranges of P. polypodioides and P. hexagonoptera overlap.

scholarly journals Interspecific Hybridization between Eggplant and Wild Relatives from Different Genepools

2016 ◽  
Vol 141 (1) ◽  
pp. 34-44 ◽  
Author(s):  
Mariola Plazas ◽  
Santiago Vilanova ◽  
Pietro Gramazio ◽  
Adrián Rodríguez-Burruezo ◽  
Ana Fita ◽  
...  
Keyword(s):  
Interspecific Hybridization ◽  
Wild Species ◽  
Interspecific Hybrid ◽  
Fruit Set ◽  
Solanum Melongena ◽  
Wild Relatives ◽  
Solanum Torvum ◽  
Introgression Breeding ◽  
Starting Point ◽  
Solanum Elaeagnifolium

Wild relatives represent a source of variation for many traits of interest for eggplant (Solanum melongena) breeding, as well as for broadening the genetic base of this crop. However, interspecific hybridization with wild relatives has been barely used in eggplant breeding programs. As initiation of an introgression breeding program we performed 1424 interspecific hybridizations between six accessions of eggplant from the Occidental and Oriental groups and 19 accessions of 12 wild species from the primary (Solanum incanum and Solanum insanum), secondary (Solanum anguivi, Solanum dasyphyllum, Solanum lichtensteinii, Solanum linnaeanum, Solanum pyracanthos, Solanum tomentosum, and Solanum violaceum), and tertiary (Solanum elaeagnifolium, Solanum sisymbriifolium, and Solanum torvum) genepools. Fruit set, hybrid seed, and seed germination were obtained between Solanum melongena and all wild species of the primary and secondary genepools. The highest fruit set percentage and quantity of seeds per fruit were obtained with the two primary genepool species S. incanum and S. insanum as well as with some secondary genepool species, like S. anguivi, S. dasyphyllum, or S. lichtensteinii, although some differences among species were observed depending on the direction of the hybridization. For small-fruited wild species, the number of seeds per fruit was lower when using them as maternal parent. Regarding tertiary genepool species, fruit set was obtained only in interspecific hybridizations of eggplant with S. sisymbriifolium and S. torvum, although the fruit of the former were parthenocarpic. However, it was possible to rescue viable interspecific hybrids with S. torvum. In total we obtained 58 interspecific hybrid combinations (excluding reciprocals) between eggplant and wild relatives. Some differences were observed among S. melongena accessions in the degree of success of interspecific hybridization, so that the number of hybrid combinations obtained for each accession ranged between 7 (MEL2) and 16 (MEL1). Hybridity of putative interspecific hybrid plantlets was confirmed with a morphological trait (leaf prickliness) and 12 single nucleotide polymorphism markers. The results show that eggplant is amenable to interspecific hybridization with a large number of wild species, including tertiary genepool materials. These hybrid materials are the starting point for introgression breeding in eggplant and in some cases might also be useful as rootstocks for eggplant grafting.

scholarly journals TRANSMISSION PATTERNS OF SELECTED MORPHOLOGICAL TRAITS IN INTERSPECIFIC EXACUM HYBRIDS

HortScience ◽  
1992 ◽  
Vol 27 (6) ◽  
pp. 680b-680
Author(s):  
Andrew Riseman ◽  
Richard Craig
Keyword(s):  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
Morphological Traits ◽  
Parental Species ◽  
Horticultural Traits ◽  
Petal Shape ◽  
Flower Form ◽  
Stem Shape

The morphology of interspecific Exacum hybrids was investigated in order to determine transmission patterns of several horticultural traits and to confirm interspecific hybrid status of plants. The evaluations utilized 557 accessions from interspecific hybridization of the following species: Exacum. macranthum, E. pallidum, E. pedunculatum, E. trinervium ssp. ritigalensis, and E. trinervium ssp. trinervium. Transmission patterns are proposed for stem shape (three phenotypes- clylindrical, winged-cylindrical and qudrangular; no dominance), petal shape (two phenotypes-rounded and acuminate; rounded dominant to acuminate) and flower form (two phenotypes- imbricate and separate; imbricate dominant to separate) Examination of the progenies confirm interspecific hybridization by the appearance of combinations of traits from the parental species and/or the observation of unique forms not previously observed.

Notes on Malesherbia (Passifloraceae) in Peru: a new species from southern Peru, a new record and a first report on interspecific hybridization in Malesherbia

Phytotaxa ◽  
2015 ◽  
Vol 202 (4) ◽  
pp. 250
Author(s):  
Maximilian Weigend ◽  
Thomas Jossberger ◽  
Hamilton Beltrán
Keyword(s):  
New Species ◽  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
New Record ◽  
Glandular Trichomes ◽  
Habitat Modification ◽  
Putative Hybrid ◽  
Geographical Separation ◽  
First Time ◽  
A New Species

Malesherbia fatimae is described as a new species from the Province Condesuyos, Department of Arequipa, Peru. The new species is clearly differentiated from all know species of the genus by forming a strictly erect, laxly branched shrub with densely tomentose indument and from the perennial Peruvian members by an absence of the glandular trichomes. No clear affinities to know species present themselves, but the new species evidently belongs to Malesherbia sect. Malesherbia. At the type locality a putative hybrid with the morphologically highly divergent Malesherbia tenuifolia was observed, showing morphologically intermediate characters between M. fatimae and M. tenuifolia. Malesherbia tenuifolia is here for the first time reported from Peru, bringing the species total for the county to 12. A second putative interspecific hybrid, Malesherbia ardens × M. arequipensis, is reported from Department Moquegua. This indicates that species of Malesherbia may hybridize when eco-geographical separation breaks down due to habitat modification. The new species and the two novel hybrids are described and illustrated.

Morphometric and flow cytometric evaluations of a putative natural hybrid of Centaurium (Gentianaceae) from Turkey

Phytotaxa ◽  
2015 ◽  
Vol 204 (1) ◽  
pp. 22 ◽  
Author(s):  
Mehmet Çiçek ◽  
AHMET EMRE YAPRAK ◽  
ALİ RAMAZAN ALAN
Keyword(s):  
Morphometric Analysis ◽  
Ploidy Level ◽  
Interspecific Hybrid ◽  
Nuclear Dna ◽  
Putative Hybrid ◽  
Natural Hybrid ◽  
Dna Amount ◽  
Flow Cytometric ◽  
Sw Turkey ◽  
Dna Amounts

A putative natural hybrid of Centaurium was discovered in a population composed of C. serpentinicola and C. tenuiflorum subsp. tenuiflorum in the vicinity of Köyceğiz (Muğla province, SW Turkey). Morphometric analysis performed using 14 diagnostic characters supported that the putative natural hybrid as an interspecific hybrid between C. serpentinicola and C. tenuiflorum subsp. tenuiflorum. Flow cytometric measurements revealed that C. serpentinicola and C. tenuiflorum subsp. tenuiflorum have similar nuclear DNA amounts (2.61 and 2.53 pg DNA/2C), whereas the putative hybrid have a significantly higher nuclear DNA amount (2.77 pg DNA/2C), and they have the same ploidy level.

scholarly journals IMPROVEMENT OF NEW GUINEA IMPATIENS BY INTERSPECIFIC HYBRIDIZATION

HortScience ◽  
1990 ◽  
Vol 25 (9) ◽  
pp. 1177a-1177
Author(s):  
Loren C. Stephens ◽  
Robin L. Fruth
Keyword(s):  
Interspecific Hybridization ◽  
Interspecific Hybrid ◽  
Interspecific Hybrids ◽  
New Guinea ◽  
Persistent Problem ◽  
Unreduced Pollen ◽  
Hybrid Approaches ◽  
Heat Tolerant ◽  
New Guinea Impatiens

New Guinea Impatiens cultivars, I. hawkeri Bull., are susceptible to hot, windy conditions throughout much of the Midwest and Western U.S. Certain Indonesian Impatiens from Java (I. platypetala Lindl.) and Celebes (I. aurantiaca Teysm.) are much more heat-tolerant. Interspecific hybrids involving Java and Celebes Impatiens with the New Guinea species have been produced, but lack of fertility has been a persistent problem, unless amphidiploids are produced. Because selection is difficult in amphidiploid populations, other methods of recovering fertility have been investigated. Some interspecific hybrid fertility has been obtained from crossing Impatiens `Tangeglow' with a Java × New Guinea hybrid. Evidence will be presented on the role of the Celebes genome in female fertility, and the role of unreduced pollen in the Java × New Guinea hybrid. Approaches to understanding and overcoming sterility in Impatiens interspecific hybrids will be discussed.

Impairment Questions and Answers

1999 ◽  
Vol 4 (4) ◽  
pp. 4-4
Keyword(s):  
Symptom Validity ◽  
Validity Testing ◽  
Symptom Validity Testing ◽  
Negative Results ◽  
Tunnel Vision ◽  
Questions And Answers ◽  
Blurry Vision ◽  
Fatigue Evaluation ◽  
Choice Testing ◽  
Rule Out

Abstract Symptom validity testing, also known as forced-choice testing, is a way to assess the validity of sensory and memory deficits, including tactile anesthesias, paresthesias, blindness, color blindness, tunnel vision, blurry vision, and deafness—the common feature of which is a claimed inability to perceive or remember a sensory signal. Symptom validity testing comprises two elements: A specific ability is assessed by presenting a large number of items in a multiple-choice format, and then the examinee's performance is compared with the statistical likelihood of success based on chance alone. Scoring below a norm can be explained in many different ways (eg, fatigue, evaluation anxiety, limited intelligence, and so on), but scoring below the probabilities of chance alone most likely indicates deliberate deception. The positive predictive value of the symptom validity technique likely is quite high because there is no alternative explanation to deliberate distortion when performance is below the probability of chance. The sensitivity of this technique is not likely to be good because, as with a thermometer, positive findings indicate that a problem is present, but negative results do not rule out a problem. Although a compelling conclusion is that the examinee who scores below probabilities is deliberately motivated to perform poorly, malingering must be concluded from the total clinical context.

Needed: A publication of negative results: Comment.

1959 ◽  
Vol 14 (9) ◽  
pp. 598-598 ◽  
Author(s):  
Leroy Wolins
Keyword(s):  
Negative Results
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