Molecular phylogenetics and generic assessment in the tribe Morindeae (Rubiaceae–Rubioideae): How to circumscribe Morinda L. to be monophyletic?

Razafimandimbison, Sylvain G.; McDowell, Tim; Halford, David A; Bremer, Birgitta

doi:10.1016/j.ympev.2009.04.007

Cited by 38 publications

(80 citation statements)

References 20 publications

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“…In Sacosperma paniculatum of tribe Spermacoceae sensu lato, corolla splits were reported by Excell (1944: 219). Corolla splits were also reported in species of Coelospermum, Damnacanthus, Gynochthodes, Mitchella and Morinda of tribe Morindeae (Robbrecht 1988, Robbrecht et al 1991, Johansson 1988& 1994, see also Razafimandimbison et al 2008Razafimandimbison et al & 2009 for the most recent changes of tribal delimitation and fig. 1) and in Pagameopsis (incertae sedis; Piesschaert et al 2001).…”

Section: Corolla Splitsmentioning

confidence: 75%

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A developmental model for the corolla in Rubiaceae. Cryptic character states in corollas of the Spermacoceae alliance

Vrijdaghs¹,

Block²,

Verstraete³

et al. 2015

Plecevo

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Background and aims -In Rubiaceae, most flowers have a tubular corolla. Earlier studies showed that a tubular corolla may develop from an annular primordium or result from postgenital fusion of petals. Often stamen-corolla tubes are formed, concurring with epipetaly. Moreover, flowers with a fenestrated tubular corolla occur. The scattered distribution of species with corolla splits in Rubiaceae suggests a multiple origin. We intended to answer the following questions: (1) should the tubular corollas studied be assigned to a single or to several character states?; and (2) are the corolla splits studied homologous? We investigated the corolla development in five species of the Spermacoceae alliance with corolla splits in comparison with a Spermacoce species without. Methods -Floral developmental studies using scanning electron microscopy (SEM) and light microscopy (LM). Results -In Spermacoce, the tubular corolla with epipetalous stamens originates from an annular primordium. In Sacosperma and Pentas, the tubular corolla develops similarly with the stamens fixed basally. In Paederia and Pentodon, individual petal primordia originate on a ring wall. Next, stamen primordia appear adaxially on the ring wall. Then, the bases of the petals fuse partially, resulting in fenestrated tubular corollas. In Sacosperma and Pentas, corolla splits are actively formed in an initially closed tubular corolla. Conclusions -The tubular corollas of the species studied in Spermacoce, Sacosperma and Pentas are early sympetalous. Those in Paederia and Pentodon are late sympetalous. The tubular corolla results from a combination of three developmental processes: the formation of (1) a stamen-corolla tube, (2) a corolla tube sensu stricto, and (3) postgenital fusion of petals. The final form of the tubular corolla and the stamen insertion depend on the relative activity of these processes. Consequently, similar looking tubular corollas may constitute different character states. The corolla splits studied constitute two different cryptic character states in respectively Sacosperma/Pentas and Paederia/Pentodon.

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Section: Corolla Splitsmentioning

confidence: 75%

“…Robbrecht 1988, Groeninckx et al 2007). Robbrecht (1988: 74) stated that the "rubiaceous hypanthium consists of only gynoecial and axial tissue".…”

Section: Floral Cups and Gynoecial Hypanthiummentioning

confidence: 99%

A developmental model for the corolla in Rubiaceae. Cryptic character states in corollas of the Spermacoceae alliance

Vrijdaghs¹,

Block²,

Verstraete³

et al. 2015

Plecevo

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“…The fruits are fused together as syncarps; seeds are globose or semi-globose [2][3][4] . The genus Morinda is placed in the tribe Morindeae, subfamily Rubioideae and the systematic affinities of the genus have been discussed by Baillon 5 , Vercourt 6 ,Bremekamp 7 ,Johansson 8,9 , Robbrecht 10 , and Razafimandimbison et al 2,3,11,12 . Taxonomic studies of the genus Morinda in Thailand have been presented on checklist or description of new species.…”

Section: Introductionmentioning

confidence: 99%

The genus Morinda (Rubiaceae) in Thailand

Kesonbuaa¹,

Chantaranothai²

2013

ScienceAsia

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The genus Morinda (Rubiaceae) is revised and presented with a key to species, descriptions with distributional and ecological data, together with illustrations of some species. Nine species are considered, one of which is divided into two varieties. Two species and one variety are endemic to the country. M. talmyi is typified. M. longifolia and M. pumila are reduced to synonymy with M. pandurifolia and M. tomentosa, respectively.

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“…It has been postulated by McClatchey [11] that multiple fruits of the broadly circumscribed Morinda ( Morinda sensu lato), which included all lianescent and arborescent Morinda species with multiple fruits recently transferred to Gynochthodes [8], evolved from an ancestor with umbels and simple fruits by suppression of the pedicels and fusion of the ovaries of the adjacent flowers. This would imply that multiple fruits of Morinda and Gynochthodes (both sensu Razafimandimbison et al [8]–[9]) are derived in Morindeae.…”

Section: Introductionmentioning

confidence: 99%

Evolution of Growth Habit, Inflorescence Architecture, Flower Size, and Fruit Type in Rubiaceae: Its Ecological and Evolutionary Implications

et al. 2012

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During angiosperm evolution, innovations in vegetative and reproductive organs have resulted in tremendous morphological diversity, which has played a crucial role in the ecological success of flowering plants. Morindeae (Rubiaceae) display considerable diversity in growth form, inflorescence architecture, flower size, and fruit type. Lianescent habit, head inflorescence, small flower, and multiple fruit are the predominant states, but arborescent habit, non-headed inflorescence, large flower, and simple fruit states occur in various genera. This makes Morindeae an ideal model for exploring the evolutionary appearances and transitions between the states of these characters. We reconstructed ancestral states for these four traits using a Bayesian approach and combined nuclear/chloroplast data for 61 Morindeae species. The aim was to test three hypotheses: 1) self-supporting habit is generally ancestral in clades comprising both lianescent and arborescent species; 2) changes from lianescent to arborescent habit are uncommon due to “a high degree of specialization and developmental burden”; 3) head inflorescences and multiple fruits in Morindeae evolved from non-headed inflorescences and simple fruits, respectively. Lianescent habit, head inflorescence, large flower, and multiple fruit are inferred for Morindeae, making arborescent habit, non-headed inflorescence, small flower, and simple fruit derived within the tribe. The rate of change from lianescent to arborescent habit is much higher than the reverse change. Therefore, evolutionary changes between lianescent and arborescent forms can be reversible, and their frequency and trends vary between groups. Moreover, these changes are partly attributed to a scarcity of host trees for climbing plants in more open habitats. Changes from large to small flowers might have been driven by shifts to pollinators with progressively shorter proboscis, which are associated with shifts in breeding systems towards dioecy. A single origin of dioecy from hermaphroditism is supported. Finally, we report evolutionary changes from headed to non-headed inflorescences and multiple to simple fruits.

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Molecular phylogenetics and generic assessment in the tribe Morindeae (Rubiaceae–Rubioideae): How to circumscribe Morinda L. to be monophyletic?

Cited by 38 publications

References 20 publications

A developmental model for the corolla in Rubiaceae. Cryptic character states in corollas of the Spermacoceae alliance

A developmental model for the corolla in Rubiaceae. Cryptic character states in corollas of the Spermacoceae alliance

The genus Morinda (Rubiaceae) in Thailand

Evolution of Growth Habit, Inflorescence Architecture, Flower Size, and Fruit Type in Rubiaceae: Its Ecological and Evolutionary Implications

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