Fruit and seed morphology in some representative genera of tribe Rhinantheae sensu lato (Orobanchaceae) and related taxa

Dong, Lina; Hong, Wang; Wortley, Alexandra H.; D, Li; Lu, Lu

doi:10.1007/s00606-014-1087-8

Cited by 10 publications

(6 citation statements)

References 36 publications

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“…glandulosum . Molecular and morphological evidence supports the independent generic status of Pseudobartsia ( Lu et al, 2007 ; Dong et al, 2013 , 2015 ).…”

Section: Introductionmentioning

confidence: 55%

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The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China

Randle

et al. 2018

Front. Plant Sci.

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Phtheirospermum (Orobanchaceae), a hemiparasitic genus of Eastern Asia, is characterized by having long and viscous glandular hairs on stems and leaves. Despite this unifying character, previous phylogenetic analyses indicate that Phtheirospermum is polyphyletic, with Phtheirospermum japonicum allied with tribe Pedicularideae and members of the Ph. tenuisectum complex allied with members of tribe Rhinantheae. However, no analyses to date have included broad phylogenetic sampling necessary to test the monophyly of Phtheirospermum species, and to place these species into the existing subfamiliar taxonomic organization of Orobanchaceae. Two other genera of uncertain phylogenetic placement are Brandisia and Pterygiella, also both of Eastern Asia. In this study, broadly sampled phylogenetic analyses of nrITS and plastid DNA revealed hard incongruence between these datasets in the placement of Brandisia. However, both nrITS and the plastid datasets supported the placement of Ph. japonicum within tribe Pedicularideae, and a separate clade consisting of the Ph. tenuisectum complex and a monophyletic Pterygiella. Analyses were largely in agreement that Pterygiella, the Ptheirospermum complex, and Xizangia form a clade not nested within any of the monophyletic tribes of Orobanchaceae recognized to date. Ph. japonicum, a model species for parasitic plant research, is widely distributed in Eastern Asia. Despite this broad distribution, both nrITS and plastid DNA regions from a wide sampling of this species showed high genetic identity, suggesting that the wide species range is likely due to a recent population expansion. The Ph. tenuisectum complex is mainly distributed in the Hengduan Mountains region. Two cryptic species were identified by both phylogenetic analyses and morphological characters. Relationships among species of the Ph. tenuisectum complex and Pterygiella remain uncertain. Estimated divergence ages of the Ph. tenuisectum complex corresponding to the last two uplifts of the Qinghai–Tibet Plateau at around 8.0–7.0 Mya and 3.6–1.5 Mya indicated that the development of a hot-dry valley climate during these uplifts may have driven species diversification in the Ph. tenuisectum complex.

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“…glandulosum . Molecular and morphological evidence supports the independent generic status of Pseudobartsia ( Lu et al, 2007 ; Dong et al, 2013 , 2015 ).…”

Section: Introductionmentioning

confidence: 55%

“…In addition, seed morphology and capsule indumentum also differ between Pterygiella and the Ph. tenuisectum complex ( Dong et al, 2013 , 2015 ). Therefore, we suggest treating the Ph.…”

Section: Discussionmentioning

confidence: 99%

The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China

Randle

et al. 2018

Front. Plant Sci.

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“…This position is, however, found neither by the newly sequenced markers (except AT1G04780; Supplementary Figure S4), analyzed individually (Supplementary Figures S1–S3, S5) or jointly (Figure 1), nor by ITS and plastid data used by Yu et al (2018). A closer relationship of the Pterygiella clade to Lindenbergia and Brandisia , as suggested by fruit and seed characters (Dong et al, 2015), is not supported by the nuclear data, but, with respect to Brandisia , by plastid data (Yu et al, 2018). Given these uncertainties and the deep divergence of Pterygiella and relatives from the Euphrasia-Rhinanthus clade, even if inferred as sister taxa (Figure 2), we consider it prudent to recognize this small group of East Asian genera as the Pterygiella clade distinct from the Euphrasia-Rhinanthus clade until its precise position within the family has been ascertained.…”

Section: Discussionmentioning

confidence: 85%

Phylogenetic Relationships in Orobanchaceae Inferred From Low-Copy Nuclear Genes: Consolidation of Major Clades and Identification of a Novel Position of the Non-photosynthetic Orobanche Clade Sister to All Other Parasitic Orobanchaceae

Feng

Randle

et al. 2019

Front. Plant Sci.

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Molecular phylogenetic analyses have greatly advanced our understanding of phylogenetic relationships in Orobanchaceae, a model system to study parasitism in angiosperms. As members of this group may lack some genes widely used for phylogenetic analysis and exhibit varying degrees of accelerated base substitution in other genes, relationships among major clades identified previously remain contentious. To improve inferences of phylogenetic relationships in Orobanchaceae, we used two pentatricopeptide repeat (PPR) and three low-copy nuclear (LCN) genes, two of which have been developed for this study. Resolving power and level of support strongly differed among markers. Despite considerable incongruence among newly and previously sequenced markers, monophyly of major clades identified in previous studies was confirmed and, especially in analyses of concatenated data, strongly supported after the exclusion of a small group of East Asian genera ( Pterygiella and Phtheirospermum ) from the Euphrasia-Rhinanthus clade. The position of the Orobanche clade sister to all other parasitic Orobanchaceae may indicate that the shift to holoparasitism occurred early in the evolution of the family. Although well supported in analyses of concatenated data comprising ten loci (five newly and five previously sequenced), relationships among major clades, most prominently the Striga-Alectra clade, the Euphrasia-Rhinanthus clade, and the Castilleja-Pedicularis clade, were uncertain because of strongly supported incongruence also among well-resolving loci. Despite the limitations of using a few selected loci, congruence among markers with respect to circumscription of major clades of Orobanchaceae renders those frameworks for detailed, species-level, phylogenetic studies.

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“…Without sampling Pterygiella , our analyses using complete chloroplast genome data placed Brandisia as sister to Rhinantheae in Orobanchaceae with BS = 94 and PP = 1.00 (Figure 3). Fruit and seed characters also showed close relationships between Brandisia and Pterygiella , as both have eglandular hairs on the surface of capsules and reticulate seeds (Dong L.-N. et al, 2013; Dong et al, 2015). Furthermore, the pollen grains of Brandisia , Pterygiella and most genera in Rhinantheae are commonly tricolpate, medium-sized, circular or subcircular, and having long and acute-ended colpi with a granulate membrane, supported the close relationships among them (Wei, 1989; Lu et al, 2007).…”

Section: Discussionmentioning

confidence: 91%

Does the Enigmatic Wightia Belong to Paulowniaceae (Lamiales)?

2019

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The familial placement of Wightia has been controversial in the Lamiales, and the genus is currently placed in Paulowniaceae in APG IV. Phylogenetic analyses of Wightia and its close relatives in Lamiales are conducted using sequences of the complete chloroplast genomes as well as sequence data from nine chloroplast DNA regions ( atpB , matK , ndhF , psbBTNH , rbcL , rps4 , rps16 intron, trnL-F , and trnV-atpE ) and one mitochondrial gene rps3 . The maximum likelihood and Bayesian analyses do not support a close relationship between Wightia and Paulownia of Paulowniaceae; instead the enigmatic Wightia is sister to Phrymaceae with strong support in all analyses. Hence Wightia should not be placed in Paulowniaceae. Because morphological data show Wightia ’s affinity to both Phrymaceae and Paulowniaceae and prior nrITS data suggest its sister relationship to Paulownia of Paulowniaceae, it is likely that Wightia may have had a hybrid origin between early lineages of Phrymaceae and Paulowniaceae. It is therefore the best to exclude Wightia from Paulowniaceae and place the genus as unassigned until further nuclear data to test the hybrid hypothesis. The seven species of Paulownia constitute a monophyletic group, and Paulowniaceae is supported to be a monogeneric family, consistent with a series of morphological and floral development characters. The genus Brandisia , which was sometimes regarded as a close relative of Wightia , is supported to be nested within Orobanchaceae, as sister to Pterygiella . This sister relationship can be corroborated by fruit, seed and pollen morphological characters.

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Fruit and seed morphology in some representative genera of tribe Rhinantheae sensu lato (Orobanchaceae) and related taxa

Cited by 10 publications

References 36 publications

The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China

The Hemiparasitic Plant Phtheirospermum (Orobanchaceae) Is Polyphyletic and Contains Cryptic Species in the Hengduan Mountains of Southwest China

Phylogenetic Relationships in Orobanchaceae Inferred From Low-Copy Nuclear Genes: Consolidation of Major Clades and Identification of a Novel Position of the Non-photosynthetic Orobanche Clade Sister to All Other Parasitic Orobanchaceae

Does the Enigmatic Wightia Belong to Paulowniaceae (Lamiales)?

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