Taxonomic and functional implications of stigma morphology in species ofCassia, Chamaecrista, andSenna (Leguminosae:Caesalpinioideae)

Owens, S. J.; Lewis, Gwilym P.

doi:10.1007/bf00936157

Cited by 33 publications

(41 citation statements)

References 6 publications

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“…(Lewis et al 2005). This classification has been supported by taxonomical studies of these three genera based on different information, such as seed proteins (Guareeb et al 1999), morphological, vegetative, and reproductive characters Barneby 1981, 1982;Gottsberger and Silberbauer-Gottsberger 1988;Owens and Lewis 1989;Dulberger et al 1994;Boonkerd et al 2005), ontogenetic characteristics (Tucker 1996), molecular systematics (Doyle et al 2000;Bruneau et al 2001), and cytogenetics (Goldblatt 1981;Schifino-Wittmann 2005a, 2005b;Biondo, Miotto, Schifino-Wittmann et al 2005).…”

Section: Introductionmentioning

confidence: 92%

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Resende¹,

Davide²,

Torres

2013

Caryologia

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Senna Mill. is one of the most representative genera of Caesalpinioideae, with wide geographical distribution. Some species have been cytogenetically characterized, but there is no information on population level. Therefore, the present work had the objective of characterizing and comparing chromosomal number and meiotic behavior of 39 accessions belonging to 11 species of Senna Mill. from southern Minas Gerais state, Brazil. Meiotic preparations were obtained by cell suspension technique and stained with 10% Giemsa solution. All meiotic phases were analyzed and the meiotic index was obtained. The species showed different chromosome numbers (n = 12, 13, 14, and 28). Meiotic behavior of four species is described for the first time. The chromosomal numbers reported for most species coincide with those described for populations from either Southern Brazil or from state of Pará. Intraspecific variation for chromosome number was observed in S. rugosa (G. Don) H. S. Irwin & Barneby (n = 14 and n = 28). This variation along with multivalent occurrence suggests polyploidization as an important event in the evolution of this species, as described for many others, mainly in Caesalpinioideae. Most of the analyzed species showed regular meiotic behavior, despite the occurrence of some irregularities.

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Section: Introductionmentioning

confidence: 92%

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Resende¹,

Davide²,

Torres

2013

Caryologia

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“…The relationship between enantiostyly and pollination biology has been investigated only in a few species of Senna (e.g., Fontanelle, 1979;Dulberger, 1981;Gottsberger and Silberbauer-Gottsberger, 1988;Carvalho and Oliveira, 2003). Other morphological studies, which focused on a few species, examined the specialization of the stigma (Owens and Lewis, 1989;Dulberger et al, 1994), the structure of the poricidal stamens (e.g., Lassaigne, 1979;Endress, 1994;Tucker, 1996a), and floral development (Tucker, 1996b).…”

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confidence: 99%

Phylogenetic relationships withinSenna(Leguminosae, Cassiinae) based on three chloroplast DNA regions: patterns in the evolution of floral symmetry and extrafloral nectaries

Marazzi

Endress

Queiroz

et al. 2006

American J of Botany

134

160

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Senna (Leguminosae) is a large, widespread genus that includes species with enantiostylous, asymmetric flowers and species with extrafloral nectaries. Clarification of phylogenetic relationships within Senna based on parsimony analyses of three chloroplast regions (rpS16, rpL16, and matK) provides new insights on the evolution of floral symmetry and extrafloral nectaries. Our results support the monophyly of only one (Psilorhegma) of the six currently recognized sections, while Chamaefistula, Peiranisia, and Senna are paraphyletic, and monotypic Astroites and Paradictyon are nested within two of the seven major clades identified by our molecular phylogeny. Two clades (I, VII) include only species with monosymmetric flowers, while the remaining clades (II-VI) contain species with asymmetric, enantiostylous flowers, in which either the gynoecium alone or, in addition, corolla and androecium variously contribute to the asymmetry. Our results further suggest that flowers were ancestrally monosymmetric with seven fertile stamens and three adaxial staminodes, switched to asymmetry later, and reverted to monosymmetry in clade VII. Fertility of all 10 stamens is a derived state, characterizing the Psilorhegma subclade. Extrafloral nectaries evolved once and constitute a synapomorphy for clades IV-VII (''EFN clade''). These nectaries may represent a key innovation in plant defense strategies that enabled Senna to undergo large-scale diversification.

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“…Recently, stigma morphology and structure as well as its interactions with pollen grains have been investigated in the Caesalpinioideae, including many species of Cassia, Senna, and Chamaecrista (Owens, 1985(Owens, , 1989Owens and Lewis, 1989). According to these authors, separation of Cassia from the other two genera is aided by stigma characters such as pore size and also the presence and morphology of fringing trichomes that are covered by a variously patterned cuticle.…”

mentioning

confidence: 99%

The Stigmatic Orifice in Cassia, Senna, and Chamaecrista (Caesalpiniaceae): Morphological Variation, Function During Pollination, and Possible Adaptive Significance

Dulberger

Smith

Bawa

1994

American Journal of Botany

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Taxonomic and functional implications of stigma morphology in species ofCassia, Chamaecrista, andSenna (Leguminosae:Caesalpinioideae)

Cited by 33 publications

References 6 publications

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Chromosome number and meiosis in populations ofSennaspecies (Caesalpinioideae – Fabaceae) from Southeast Brazil

Phylogenetic relationships withinSenna(Leguminosae, Cassiinae) based on three chloroplast DNA regions: patterns in the evolution of floral symmetry and extrafloral nectaries

The Stigmatic Orifice in Cassia, Senna, and Chamaecrista (Caesalpiniaceae): Morphological Variation, Function During Pollination, and Possible Adaptive Significance

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