Studies on Petunia III. A Redescription and Additional Discussion of Certain Species of Petunia

Ferguson, Margaret C.; Ottley, Alice M.

doi:10.2307/2436202

Cited by 12 publications

(13 citation statements)

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“…Even when the experimental plants were placed in stationary conditions and flowers were protected against disturbance by insects or strong wind, they still exhibited 100% capsule-set. Furthermore, this species has flowers of the smallest size in the genus, 5-6 mm in diameter (see plate 33 in Ferguson and Ottley 1932), and we never found insects visiting the flowers of this species in the native habitats. In this species, virtually all pollen tubes reached the bottom of the style within 24 h after self-pollination (Fig.…”

Section: Taxonomic Relationships Of Self-(in)compatibilitymentioning

confidence: 76%

Differentiation in the status of self-incompatibility among Calibrachoa species (Solanaceae)

Tsukamoto

Ando

Watanabe

et al. 2002

Journal of Plant Research

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The overall status of self-incompatibility, as assessed by the rate of capsule-set after self-pollination, was investigated in the genus Calibrachoa (Solanaceae). Thirty-two species were surveyed using a total of 655 individuals collected in 102 different native populations in Argentina, Brazil, Mexico, and Uruguay. The rate of capsule-set in 278 voucher specimens collected from the same native habitats was also measured to obtain additional information to assess the degree of self-(in)compatibility. Only one species, Calibrachoa parviflora, was self-compatible (SC, autogamous) and the other 31 species were found to be self-incompatible (SI). A mixed population (SI and SC individuals in the same population) was not found. The differentiation of C. parviflora as an autogamous species is associated with a successful occupation of different (riparian) habitats within a larger range of geographic distribution compared to the rest of the species in the principally SI genus of Calibrachoa.

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Section: Taxonomic Relationships Of Self-(in)compatibilitymentioning

confidence: 76%

Differentiation in the status of self-incompatibility among Calibrachoa species (Solanaceae)

Tsukamoto

Ando

Watanabe

et al. 2002

Journal of Plant Research

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“…Apenas uma espécie, C. parviflora (Juss.) Wijsman, é reconhecidamente autógama e não necessita de agentes polinizadores (Ferguson & Ottley 1932, Wijsman et al 1983. Os indivíduos desta espécie possuem flores muito reduzidas, com menos de 1 cm de comprimento, e são ruderais.…”

Section: Discussionunclassified

Biologia reprodutiva de Calibrachoa elegans (Miers) Stehmann & Semir (Solanaceae)

Stehmann¹,

Semir²

2001

Rev. bras. Bot.

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-(Reproductive biology of Calibrachoa elegans (Miers) Stehmann & Semir (Solanaceae)). Calibrachoa elegans is an endemic annual species from the "canga" region in the iron quadrangle, Minas Gerais, Brazil. The study of its reproductive biology involved cross-pollination experiments, self-incompatibility tests and observations of the pollination process. Results of manual pollination experiments showed that the studied population is allogamous. Interruption of pollen tube growth in the style of self-pollinated flowers confirmed the occurrence of self-incompatibility reactions. Pollination is effected only by females of Hexantheda missionica (Colletinae, Apoideae), which show high fidelity to flowers of C. elegans; males use the flowers as a nectar source, as stops between flights when searching for females, and as shelter during the night. They prepare the shelter by cutting and removing anthers and style. The populations of Hexantheda missionica found in Minas Gerais are the first records of this species for southeastern Brazil and probably represent remnants that reached this region during the past, but are now disjunct and isolated from those in southern Brazil.RESUMO -(Biologia reprodutiva de Calibrachoa elegans (Miers) Stehmann & Semir (Solanaceae)). Calibrachoa elegans é uma espécie anual, endêmica da região da canga do quadrilátero ferrífero de Minas Gerais, Brasil. O estudo da sua biologia reprodutiva envolveu experimentos de cruzamentos, teste do sistema de auto-incompatibilidade e observação do processo de polinização. Os experimentos realizados através de polinizações manuais indicam que a população estudada é preferencialmente alógama. A interrupção do crescimento do tubo polínico no estilete das flores autopolinizadas, verificada através da microscopia de fluorescência, confirmou a ocorrência de reação de auto-incompatibilidade. A polinização é realizada apenas pelas fêmeas de Hexantheda missionica (Colletinae, Apoideae), uma abelha com alta fidelidade de visita às flores de C. elegans. Os machos desta espécie utilizam as flores como fonte de néctar, como local para pouso entre os vôos de patrulhamento a procura de fêmeas para acasalamento e como abrigo noturno. Para se acomodarem na flor, geralmente cortam e removem os estames e o estilete. As populações de Hexantheda missionica encontradas em Minas Gerais são o primeiro registro da espécie para a região sudeste do Brasil e, provavelmente, representam remanescentes que chegaram a esta região no passado e que agora se encontram disjuntas e isoladas das populações da região sul do Brasil.

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“…have been bred since the early 1830s (Paxton 1836). The progenitors of garden petunias have been presumed to be of two species groups, P. axillaris complex with a white flower, and P. integrifolia complex with a purple flower (Ferguson andOttley 1932, Sink 1975), which were classified into A group and D group, respectively by Ando et al (1999). However, there is no clear evidence to show which taxa were actually used as genetic donors for garden petunias.…”

Section: Introductionmentioning

confidence: 99%

Molecular discrimination among taxa of Petunia axillaris complex and P. integrifolia complex based on PolA1 sequence analysis

et al. 2008

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Petunia axillaris complex and P. integrifolia complex consist of three subspecies (ssp. axillaris, ssp. parodii and ssp. subandina) and two species (P. integrifolia and P. inflata), respectively. Since these taxa within each complex can only be distinguished by the flower morphology, it would be useful to discriminate them by DNA markers. In this study, we sequenced the 19th intron and the 20th exon of the PolA1 gene, a single gene encoding the largest subunit of RNA polymerase I, and showed clear differences between P. axillaris complex and P. integrifolia complex, and also among all the taxa within each complex. These sequence variations will be promising to develop PCR-based markers to discriminate taxa within P. axillaris complex and P. integrifolia complex.

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Studies on Petunia III. A Redescription and Additional Discussion of Certain Species of Petunia

Cited by 12 publications

References 0 publications

Differentiation in the status of self-incompatibility among Calibrachoa species (Solanaceae)

Differentiation in the status of self-incompatibility among Calibrachoa species (Solanaceae)

Biologia reprodutiva de Calibrachoa elegans (Miers) Stehmann & Semir (Solanaceae)

Molecular discrimination among taxa of Petunia axillaris complex and P. integrifolia complex based on PolA1 sequence analysis

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