Taxonomic valué of hairiness in &lt;i&gt;Centranthus calcitrapae&lt;/i&gt; (L.) Dufresne fruits (&lt;i&gt;Valerianaceae&lt;/i&gt;)

Silvestre, Santiago

doi:10.3989/ajbm.2000.v58.i2.155

Cited by 3 publications

(5 citation statements)

References 4 publications

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“…It remains to be seen whether variation in hairiness of H. nummularium is the phenotypic expression of adaptive differentiation, with little or no implication for taxonomy (cf. Silvestre 2000). Greater knowledge of the genetic bases of pubescence may change focus from taxonomic significance to functional and adaptive significance of variation in hairs (e.g.…”

Section: Discussionmentioning

confidence: 98%

“…obscurum from Italy did not deviate from the expected 3:1 ratio, suggesting that the monogenic inheritance of a dense cover of stellate hairs on the abaxial surface of the leaves applies to the whole species complex and not just to the Scandinavian part. Studies of the genetic background of hairiness in plants have found that glabrousness (Westerberg 1992;Silvestre 2000;Kärkkäinen and Å gren 2002;Yol and Uzun 2011) and trichome morphology (van Dam et al 1999) are controlled by one autosomal recessive gene. Besides the Mendelian inheritance of presence and absence of hairs, studies have revealed the inheritance of length and density of hairs to be more complex (Sharma and Waines 1994;Kärkkäinen and Å gren 2002).…”

Section: Inheritance Of Stellate Hairsmentioning

confidence: 97%

“…An increasing number of studies of crop plants, as well as plants in natural populations, have shown that hairs on different parts of the plant are controlled by a Mendelian gene with two alleles, usually one dominant and one recessive (e.g. Westerberg 1992;Silvestre 2000;Kärkkäi-nen and Å gren 2002;Kivmäki et al 2007;Yol and Uzun 2011).…”

Section: Introductionmentioning

confidence: 99%

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Genetic basis of a key character in Helianthemum nummularium

Widén

2015

Plant Syst Evol

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Two subspecies of Helianthemum nummularium (L.) Mill. occur in southern Scandinavia. The key character distinguishing the two subspecies is a dense cover of stellate hairs on the abaxial surface of the leaves in subsp. nummularium that are not found in subsp. obscurum. Stellate hairs on the abaxial surface of the leaves are not a discrete character, but occur in a more or less continuous range from zero stellate hairs to a thick carpet of white intertwisted stellate hairs. A template involving seven classes (scores) was used to describe the variation in stellate hairs. Forty-one natural populations were studied in the field, and their offsprings raised in a common garden were also studied. Distribution of hair scores showed little overlap or few intermediates between the two taxa. In crosses between individuals assumed to be homozygous for the key character of subsp. obscurum and subsp. nummularium, respectively, all progeny in F1 showed hair scores in the range of that found in subsp. obscurum. Consequently, heterozygous individuals could not be distinguished from homozygous individuals of subsp. obscurum. Segregation in F2 did not deviate from the expected 3:1 ratio (obscurum:nummularium), indicating one major gene with a dominant allele for the key character of subsp. obscurum and a recessive allele for the key character of subsp. nummularium. Besides the Mendelian inheritance of the presence/absence of a whitish felt of stellate hairs, the density of hairs appeared to be further modified by minor (quantitative) genes and environment. The frequency of the recessive allele for the subsp. nummularium phenotype in mixed populations showed a strong correlation between field-sampled plants and their offspring in a common garden, supporting the conclusion that the key character was controlled by Mendelian inheritance.

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Section: Discussionmentioning

confidence: 98%

Section: Inheritance Of Stellate Hairsmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

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Genetic basis of a key character in Helianthemum nummularium

Widén

2015

Plant Syst Evol

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“…nummularium from subsp. obscurum has a simple genetic background suggests that the taxonomic significance of indumentum has been overestimated in the H. nummularium complex (Silvestre, ). As an alternative to the hypothesis of introgression between taxa, we suggest that the poor correspondence between plastid haplotype distribution and subspecies circumscription is a result of morphological convergence [i.e.…”

Section: Discussionmentioning

confidence: 99%

Phylogeography of the European rock roseHelianthemum nummularium(Cistaceae): incongruent patterns of differentiation in plastid DNA and morphology

2014

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Helianthemum nummularium is a morphologically variable species that has been subdivided into several subspecies based on indumentum characters. We investigated four of these subspecies for variation in plastid DNA and leaf and petal shape in Europe. Three size-variable mononucleotide repeat regions were amplified by means of species-specific primers and 18 combined haplotypes were identified. The highest haplotype diversity was found in the Alps and the surrounding lowland areas, whereas marginal areas such as northern Europe and the south-eastern Balkans had a lower diversity. Most of the common haplotypes were shared between subspecies and showed a geographical structuring across the range of the species, whereas geographically restricted haplotypes were found elsewhere (e.g. in the Baltic area). Leaf and petal shape descriptors could not differentiate between subspecies. The role of hybridization and introgression between post-glacial migration lineages is discussed. As an alternative hypothesis to introgression between ancient taxa, we suggest that the poor correspondence between plastid haplotype distribution and subspecies circumscription could be a result of multiple origins of similar morphs (grouped into taxonomic subspecies) in different parts of the distribution range of the complex.

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“…Hair density is often under some genetic control, revealed by crosses between species within a genus or between morphs within species (Ågren and Schemske 1992;Paliniswamy and Bodnaryk 1994). The spacing and number of hairs can have a complicated genetic background (Larkin et al 1996), but an increasing number of studies have shown that hairiness on different parts of the plant is governed by simple Mendelian genes (Westerberg 1992;Silvestre 2000;Kärkkäinen and Ågren 2002;Kivmäki et al 2007;Yol and Uzun 2011;Widén 2015).…”

Section: Introductionmentioning

confidence: 99%

Inheritance of a hair character in Helianthemum oelandicum var. canescens and allele frequencies in natural populations

Widén

2017

Plant Syst Evol

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Taxonomic valué of hairiness in <i>Centranthus calcitrapae</i> (L.) Dufresne fruits (<i>Valerianaceae</i>)

Cited by 3 publications

References 4 publications

Genetic basis of a key character in Helianthemum nummularium

Genetic basis of a key character in Helianthemum nummularium

Phylogeography of the European rock roseHelianthemum nummularium(Cistaceae): incongruent patterns of differentiation in plastid DNA and morphology

Inheritance of a hair character in Helianthemum oelandicum var. canescens and allele frequencies in natural populations

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