Isolation mechanisms between two sympatric Sophronitis (Orchidaceae) species endemic to Northeastern Brazil

Silva-Pereira, Viviane; Smidt, Eric de Camargo; Borba, Eduardo Leite

doi:10.1007/s00606-007-0583-5

Cited by 20 publications

(15 citation statements)

References 32 publications

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“…() suggested that prezygotic barriers contributed more to reproductive isolation than postzygotic barriers. This hypothesis was supported in other studies (Lowry, Rockwood et al., ; Pellegrino, Bellusci, & Musacchio, ; Sobel & Streisfeld, ; Xu et al., ), but there are important exceptions in some lineages (Borba, Shepherd, & Semir, ; Chen, Luo, & Zhang, ; Costa, Lambert, Borba, & de Queiroz, ; Silva‐Pereira, de Camargo Smidt, & Borba, ). For example, low F 1 germination rates and F 1 pollen sterility, as components of postzygotic isolation, were crucial for reproductive isolation between Mussaenda pubescens var.…”

Section: Introductionsupporting

confidence: 63%

“…The reduction in fruit set and well‐developed embryos following interspecific hand pollination has been reported in other orchid genera including Pleurothallis and Sophronitis (Borba et al., ; Silva‐Pereira et al., ). In our study, fruit set and the production of presumably viable, large embryos in interform pollination treatments were significantly lower than in our intraform pollination treatments in the white form.…”

Section: Discussionmentioning

confidence: 67%

“…First, as the intermediate form is found only where pink and white are sympatric, it may be best interpreted as a recurrent hybrid. The fact that intermediate and pink forms are polyphyletic follows other cases of interspecific hybridization in which some characters in the F 1 are shared with only one parent and do not intergrade (Bernhardt & Edens‐Meier, ; Borba et al., ; Edens‐Meier et al., ; Silva‐Pereira et al., ). Our results comparing fruit set and embryo development in the intermediates suggest some degree of hybrid sterility in intermediates but further investigations are required.…”

Section: Discussionmentioning

confidence: 97%

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Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?

Tao

Ren

Bernhardt³

et al. 2018

Ecology and Evolution

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Isolation between species, or taxa sharing a common lineage, depends primarily on the relative strengths of various reproductive barriers. Previous studies on reproductive isolation between orchids emphasized mechanical and ethological barriers in flowers of species showing food and/or sexual mimicry. In this study, we investigated and quantified a series of prepollination and postpollination barriers between pink and white forms of Spiranthes sinensis sl, a nectar‐secreting complex. We generated ML trees based on trnS‐G and matK to explore phylogenetic relationships in this species complex. Spiranthes sinensis sl segregated from some other congeners, but the white form constituted a distinct clade in relation to the pink form. The white form secreted 2‐Phenylethanol as it is a single‐scent compound and was pollinated almost exclusively by native, large‐bodied Apis cerana and Bombus species (Apidae). Apis cerana showed a high floral constancy to this form. The scentless, pink form was pollinated primarily by smaller bees in the genera Ceratina (Apidae), and members of the family Halictidae, with infrequent visits by A. cerana and Bombus species. Fruit set and the production of large embryos following interform pollination treatments were significantly lower compared to intraform pollination results for the white form. Our results suggested that pollinator isolation, based on color and scent cues, may result in greater floral constancy in white populations when both forms are sympatric as two different, guilds of pollinators forage selectively preventing or reducing prospective gene flow. Postpollination barriers appear weaker than prepollination barriers but they also play a role in interform isolation, especially in the white form. Our findings suggest that floral color forms in S. sinensis do not represent an unbalanced polymorphism. Interpretations of the evolutionary status of these forms are discussed.

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Section: Introductionsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 67%

Section: Discussionmentioning

confidence: 97%

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Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?

Tao

Ren

Bernhardt³

et al. 2018

Ecology and Evolution

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“…An interesting example is furnished by the co-flowering and pollinator-sharing species Sophronitis sincorana and S. pfisteri. These two Brazilian endemic orchids are characterized by a ''gullet flowers'', which usually implies the existence of mechanical pre-pollination barriers (Silva-Pereira et al 2007). Indeed, these species do not form natural hybrids; however, when heterospecific pollen was manually transferred, the pollen tubes showed abnormal development in the interior of the ovary.…”

Section: Discussionmentioning

confidence: 99%

Strong post-pollination pre-zygotic isolation between sympatric, food-deceptive Mediterranean orchids

2010

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Mediterranean orchids that grow in admixed, co-flowering populations, and frequently show hybrid progenies are interesting to use to study the nature and the strength of post-zygotic barriers. However, examination of pre- and post-pollination pre-zygotic isolating mechanisms requires sympatric, co-flowering species pairs that do not produce hybrid swarms. In this study, we analyzed a contact zone between Orchis italica and O. papilionacea, in which hybrid forms have never been reported, although hybridization between members of their groups of appurtenance has been signaled. We investigated pre-pollination barriers observing the floral phenology of both species and identified pollinators by means of molecular analysis of pollinaria collected on the insects captured in the study site. Post-pollination barriers were tested performing manual crosses in order to evaluate pollen germination/pollen tube growth in vivo and fruit and seed formation. Floral phenologies of O. italica and O. papilionacea display nearly overlapping trends, and two common pollinators have been identified by molecular analysis of pollinaria. Thus, pre-pollination barriers are very weak or nonexistent. Bidirectional crosses have shown that the growth of heterospecific pollen tubes is fully blocked in stigmatic cell layers. Since no fruit formation was detected in bidirectional interspecific crosses, we assume that reproductive isolation between the examined species is fully guaranteed by post-pollination pre-zygotic mechanisms acting at stigmatic level. Such condition has been rarely described and may mask the potential action of post-zygotic mechanisms.

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“…Similar results were found in other orchids genera. Smidt et al (2006) and Silva-Pereira et al (2007) studied the reproductive biology of four species from Chapada Diamantina, Bahia State, Brazil, and all were selfcompatible and pollinator-dependent. On the other hand, Micheneau et al (2008) found that Jumellea stenophylla is clearly able to produce seeds in the absence of pollinators, and the fruiting success of bagged flowers reached 66.7 %.…”

Section: Resultsmentioning

confidence: 99%

The Bletia catenulata ornamental orchid is self-compatible but pollinator-dependent for reproduction

Neto

Correa

Barros

et al. 2015

Pesqui. Agropecu. Trop.

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Bletia catenulata is a native Brazilian orchid whose populations have suffered from predatory collection. Aiming at elucidating aspects of its reproductive biology and the relation with seed germination, pollination tests were carried out in flowers of plants cultivated in a greenhouse. Manual cross and self-pollination resulted in high percentage of fructification (76.7-86.7 %), being only 26.7 % for natural pollination, in which the absence of pollinators, due to flower isolation, resulted in absence of fruits. In vitro seed germination for all fruits from the different pollination processes was low, being 8.6 % the highest percentage for protocorms. Thus, B. catenulata is selfcompatible, resulting in viable seeds, but pollinator-dependent for sexual reproduction.

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Isolation mechanisms between two sympatric Sophronitis (Orchidaceae) species endemic to Northeastern Brazil

Cited by 20 publications

References 32 publications

Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?

Does reproductive isolation reflect the segregation of color forms in Spiranthes sinensis (Pers.) Ames complex (Orchidaceae) in the Chinese Himalayas?

Strong post-pollination pre-zygotic isolation between sympatric, food-deceptive Mediterranean orchids

The Bletia catenulata ornamental orchid is self-compatible but pollinator-dependent for reproduction

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