N<scp>arrow hybrid zone between two subspecies of big sagebrush</scp>,<i>A<scp>rtemisia tridentata</scp></i>(A<scp>steraceae</scp>). III. D<scp>evelopmental instability</scp>

Freeman, D. Carl; Graham, John H.; Byrd, D. W.; McArthur, E. Durant; Turner, William

doi:10.1002/j.1537-2197.1995.tb11586.x

Cited by 38 publications

(17 citation statements)

References 58 publications

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“…Despite significant differences among lines in the level of FA of several traits, no coherent changes in FA with inter-population hybridization were observed across traits, and hybrid progenies were not consistently more, or less, asymmetric than parental lines. These results are consistent with previous studies in which hybrids were either equally or less asymmetric than parental lines (Ferguson et al, 1988;Alibert et al, 1994;Freeman et al, 1995;Gharrett et al, 1999;Debat et al, 2000;Andersen et al, 2002;Rao et al, 2002;see Alibert & Auffray, 2003 for review). However, in several of these studies, signs of heterosis were found in the F1 (e.g.…”

Section: Inter-population Hybrids Fa and Outbreeding Depressionsupporting

confidence: 92%

Consequences of inter-population crosses on developmental stability and canalization of floral traits inDalechampia scandens(Euphorbiaceae)

Pélabon

Carlson

Hansen

et al. 2004

Journal of Evolutionary Biology

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Congruence between changes in phenotypic variance and developmental noise in inter‐population hybrids was analysed to test whether environmental canalization and developmental stability were controlled by common genetic mechanisms. Developmental stability assessed by the level of fluctuating asymmetry (FA), and canalization by the within‐ and among‐individual variance, were measured on several floral traits of Dalechampia scandens (Euphorbiaceae). Hybridization affected canalization. Both within‐ and among‐individual phenotypic variance decreased in hybrids from populations of intermediate genetic distance, and strongly increased in hybrids from genetically distant populations. Mean‐trait FA differed among cross‐types, but hybrids were not consistently more or less asymmetric than parental lines across traits. We found no congruence between changes in FA and changes in phenotypic variance. These results suggest that developmental stability (measured by FA) and canalization are independently controlled. This study also confirms the weak relationship between FA and the breakdown of coadapted gene complexes following inter‐population hybridization.

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Section: Inter-population Hybrids Fa and Outbreeding Depressionsupporting

confidence: 92%

Consequences of inter-population crosses on developmental stability and canalization of floral traits inDalechampia scandens(Euphorbiaceae)

Pélabon

Carlson

Hansen

et al. 2004

Journal of Evolutionary Biology

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“…Manly and Ledig 1979;Graham and Felley 1985;Leary et al 1985). However, other studies have reported no differences between hybrids and parental species (e.g., Felley 1980;Freeman et al 1995). The genotypes of atemoya, the hybrid between A. cherimoya and A. squamosa, did not show an increased level of FA for any of the traits studied in comparison with A. cherimola.…”

Section: Fluctuating Asymmetry In Hybridsmentioning

confidence: 58%

Analysis of Genotypic Differences in Developmental Stability in Annona cherimola

Perfectti¹,

Camacho²

1999

Evolution

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The genetic basis of developmental stability, measured as asymmetry (fluctuating asymmetry in leaves), was analyzed in leaves and flowers of cherimoya (Annona cherimola Mill) and atemoya (A. cherimola X A. squamosa). The individuals analyzed belonged to a controlled collection of cultivars (clones) that had previously been characterized by means of isozymes. We used a nested design to analyze the differences in asymmetry at several sampling levels: individual leaves and flowers, individual trees, and genotypes. The clonal repeatability of developmental stability was not significantly different from zero, thus suggesting the absence of heritability of the asymmetry for leaves and flowers under these environmental conditions. No relationship between asymmetry and individual heterozygosity was found, but leaf fluctuating asymmetry was significantly related to particular isozymic genes. Petal and leaf size showed a phenotypically plastic response to the exposure zone of the tree (mainly due to light). Leaf fluctuating asymmetry also showed such a plastic response. No significant correlation was found between asymmetry and any pomological characters (some of these being fitness related). Finally, the hybrid species (atemoya) did not show larger developmental instability than did the parental species (cherimoya). All these data show that cherimoya asymmetry reveals the random nature of developmental noise, with developmental stability for leaves being possibly related to specific chromosome regions, but with weak evidence for genotypic differences in developmental stability.

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“…For example, most leaves have the same number of leaf‐margin teeth on each side of the blade: 0 or 1 pair in the case of Q. laurina , 2 or 3 pairs in the case of Q. affinis . The presence of asymmetrical leaves with unequal numbers of teeth on each side, particularly in the hybrid zone, could be an indication of developmental instability resulting from the disruption of parental gene complexes (Freeman et al ., 1995).…”

Section: Discussionmentioning

confidence: 99%

Leaf morphometric variation in Quercus affinis and Q. laurina (Fagaceae), two hybridizing Mexican red oaks

González‐Rodríguez¹,

Oyama²

2005

Botanical Journal of the Linnean Society

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Leaf variation was examined in two hybridizing Mexican red oaks, Quercus affinis and Q. laurina . Data of nine traits were obtained for ten randomly chosen leaves in each of 512 individuals from 16 populations sampled along a geographical gradient, including the distribution area of both species and a putative area of secondary contact and hybridization. A cluster analysis recognized two main groups of populations, which were congruent with the taxonomic assignment of the predominant morphological type within the populations and were thus labelled ' Q. affinislike' and ' Q. laurina -like' population groups. A nested analysis of variance revealed that the largest proportion of the total variation was contained within populations, as among-tree variation (28-54%, depending on the trait), and as intra-individual variation (17-56%). However, differences between the two groups of populations (3-27%) and among populations within groups (5-21%) were also significant for the nine traits. A distinct pattern of change across populations was observed for each trait. Variation was particularly pronounced along the geographical gradient for petiole length and leaf-margin teeth number, possibly implying selection on these two traits. Results suggest that phenotypic plasticity, gene flow, hybridization and natural selection have shaped foliar variation in this oak complex. Barton NH, Hewitt GM. 1989. Adaptation, speciation and hybrid zones. Nature 341: 497-503. Blue MP, Jensen RJ. 1988. Positional and seasonal variation in oak (Quercus: Fagaceae) leaf morphology. American Journal of Botany 75: 939-947. Bonnet E, Van de Peer Y. 2001. Zt: a software tool for simple and partial mantel tests Flanders, Belgium: Interuniversity Institute for Biotechnology, Ghent University. Bruschi P, Grossoni P, Bussotti F. 2003. Within-and among tree variation in leaf morphology of Quercus petraea (Matt.) Liebl. natural populations. Trees 17: 164-172. Bruschi P, Vendramin GG, Bussotti F, Grossoni P. 2000. Morphological and molecular differentiation between Quercus petraea (Matt.) Liebl. and Quercus pubescens Willd. (Fagaceae) in Northern and Central Italy. Annals of Botany 85: 325-333. Domínguez CA, Eguiarte LE, Núñez-Farfán J, Dirzo R. 1998. Flower morphometry of Rhizophora mangle (Rhizophoraceae): geographical variation in Mexican populations.

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Narrow hybrid zone between two subspecies of big sagebrush,Artemisia tridentata(Asteraceae). III. Developmental instability

Cited by 38 publications

References 58 publications

Consequences of inter-population crosses on developmental stability and canalization of floral traits inDalechampia scandens(Euphorbiaceae)

Consequences of inter-population crosses on developmental stability and canalization of floral traits inDalechampia scandens(Euphorbiaceae)

Analysis of Genotypic Differences in Developmental Stability in Annona cherimola

Leaf morphometric variation in Quercus affinis and Q. laurina (Fagaceae), two hybridizing Mexican red oaks

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