The Identification of Hybrid Plants in Segregating Populations

Goodman, M. M.

doi:10.1111/j.1558-5646.1967.tb00161.x

Cited by 17 publications

(10 citation statements)

References 9 publications

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“…typical Q. robur plants (qr), products of introgression between Q. robur and primary hybrids (ir), F, and F 2-phenotypes (hy), products ofintrogression between Q. petraea and primary hybrids (ip) and typical Q. petraea plants (qp), (Goodman 1966). We also calculated the place of the exact intermediates (ii).…”

Section: Weighting Ofanalysis Methodsmentioning

confidence: 99%

A multivariate analysis of introgression betweenQuercus roburandQ. petraeain The Netherlands

Ietswaart

Feij

1989

Acta Botanica Neerlandica

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Hybridization and introgression between Quercus robur and Q. petraea was investigated in 12 Dutch populations, using multivariate analysis. Compared with the reference groups, the differences between the two taxa are slight, but distinct. The Q. petraea types differ more from their reference group than the Q. robur types, possibly due to greater selection pressure. In most populations a range of specimens occurs between pure Q. robur and pure Q. petraea. The latter category is poorly represented, and actual F,-and F 2-hybrids are most uncommon. Products ofintrogression between primary hybrids and Q. robur as well as Q. petraea constitute an important part of the populations. Hybridization and introgression is partly due to planting of Q. robur by man. In the natural population of the Meinweg a gradient is established between Q. robur in the lower, moist levels and Q. petraea in the higher, relatively dry levels.

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Section: Weighting Ofanalysis Methodsmentioning

confidence: 99%

A multivariate analysis of introgression betweenQuercus roburandQ. petraeain The Netherlands

Ietswaart

Feij

1989

Acta Botanica Neerlandica

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“…Hybrid indices are potentially useful in showing backcrossing, and, when a population is sampled at random, hybrid index histograms can be used to show the structure of a hybrid swarm. Hatheway (1962) and Goodman (1967) discuss character weighting for the hybrid index. Gay (1960) provides an elaboration on hybrid index analysis for comparing populations differing in the amount of hybridization.…”

Section: Hybrid Index Analysismentioning

confidence: 99%

On inferring hybridity from morphological intermediacy

Wilson

1992

TAXON

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“…An intermediate nearly equal to one putative parent for some measurements and nearly equal to the other putative parent for others may be an ancestor that is intermediate between its descendants, and not a hybrid intermediate. Goodman (1967) presented an excellent review of classical, statistical approaches. These approaches are based on assumptions that the specimens of each parental species sample a multivariate distribution that is not necessarily the same for each species.…”

Section: Introductionmentioning

confidence: 99%

“…If the species have been correctly delimited, if all the species represented by specimens in the sample have been recognized in advance, if the specimens used to estimate the parameters of the parental species multivariate distribution have been correctly identified, and if the character variation is normally distributed, then classical discriminant function methods should work well to correctly identify specimens that "fall between" the designated parental species. Goodman (1967) presented an example of parental varieties of Gossypium barbadense and G. hirsutum. with their F 1 and F 2 hybrids and backcrosses, and used this example to compare the accuracy and efficiency of several discriminant functions.…”

Section: Introductionmentioning

confidence: 99%

Hypothesizing hybrids and parents using character intermediacy, parental distance, and equality

Estabrook

Gil-ad

Reznicek

1996

TAXON

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Summary Estabrook, G. F., Gil‐ad, N. L. & Reznicek, A. A.: Hypothesizing hybrids and parents using character intermediacy, parental distance, and equality. – Taxon 45: 647‐682. 1996. – ISSN 0040‐0262. A simple method for objectively screening morphological variation in study sets suspected of containing hybrids is presented. The method applies to a collection of specimens in which two or more species along with some or all of their hybrids are suspected to be represented. The purpose of the method is to hypothesize which specimens might be of hybrid origin, and for each of these specimens to indicate which other two specimens resemble those that might have been its parents. The method is employed in the computer program HYWIN by using two kinds of computationally intense techniques: evaluation of a hybrid optimality score for each triplet generated from three quantitatively defined criteria: hybrid intermediacy (IN), parental distance (PD), and equality (EQ); and simulation of a probability hypothesis to generate measures of the level of statistical certainty. The method can be applied in direct studies of hybrids and their parents, taxonomic treatments, pinpointing of specimens that merit study with other techniques, and screening of data sets for putative hybrids and hybrid species prior to phylogenetic reconstruction.

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The Identification of Hybrid Plants in Segregating Populations

Cited by 17 publications

References 9 publications

A multivariate analysis of introgression betweenQuercus roburandQ. petraeain The Netherlands

A multivariate analysis of introgression betweenQuercus roburandQ. petraeain The Netherlands

On inferring hybridity from morphological intermediacy

Hypothesizing hybrids and parents using character intermediacy, parental distance, and equality

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