Asterids

Schönenberger, Jürg; Balthazar, Maria von

doi:10.1111/boj.12120

Cited by 5 publications

(3 citation statements)

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“…Asparagaceae), and rosids (e.g. Crassulaceae and Rutaceae), but most notably in asterids (Stevens, 2001;Endress, 2006Endress, , 2010Endress, , 2011Ottra et al, 2013;Sch€ onenberger & von Balthazar, 2013) (Fig. 1a).…”

Section: To Fuse or Not To Fuse: Convergent Origins Of Perianth Fumentioning

confidence: 99%

Bridging the gaps: evolution and development of perianth fusion

Zhong

Preston

2015

New Phytologist

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330I.330II.331III.332IV.333334References334 Summary One of the most striking innovations in flower development is the congenital or postgenital union of petals (sympetaly) which has enabled dramatic specialization in flower structure and possibly accelerated speciation rates. Sympetalous flowers exhibit extraordinary variation in development, including the degree and timing of fusion, and fusion with other floral organs. Different axes of corolla tube complexity can be disentangled at the developmental level, with most variation being explained by differences in coordinated growth between interconnected and lobed regions of neighboring petal primordia, and between lower and upper portions of the corolla tube, defined by the stamen insertion boundary. Genetically, inter‐ and intra‐specific variation in the degree of petal fusion is controlled by various inputs from genes that affect organ boundary and lateral growth, signaling between different cell types, and production of the cuticle. It is thus hypothesized that the evolution and diversification of fused petals, at least within the megadiverse Asteridae clade of core eudicots, have occurred through the modification of a conserved genetic pathway previously involved in free petal development.

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Section: To Fuse or Not To Fuse: Convergent Origins Of Perianth Fumentioning

confidence: 99%

Bridging the gaps: evolution and development of perianth fusion

Zhong

Preston

2015

New Phytologist

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“…About one third of the ~275,000 angiosperm species produce flowers with petals fused into a corolla tube (i.e., sympetalous), forming a protective enclosure of nectaries and reproductive organs. Corolla tubes have evolved multiple times independently across the angiosperm tree of life (Endress, 2011), most notably in the common ancestor of the Asterids, a clade containing more than 80,000 species (Schonenberger and Von Balthazar, 2013). Subsequent elaboration in length, width, and curvature has led to a great variety of corolla tube shapes that enabled asterid species to exploit many specialized pollinator groups (e.g., beeflies, hawkmoths, hummingbirds, nectar bats), which in turn drives rapid plant speciation (Muchhala, 2006;Hermann and Kuhlemeier, 2011;Paudel et al, 2015;Lagomarsino et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Developmental Genetics of Corolla Tube Formation: Role of the tasiRNA-ARF Pathway and a Conceptual Model

et al. 2020

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Over 80,000 angiosperm species produce flowers with petals fused into a corolla tube. The corolla tube contributes to the tremendous diversity of flower morphology and plays a critical role in plant reproduction, yet it remains one of the least understood plant structures from a developmental genetics perspective. Through mutant analyses and transgenic experiments, we show that the tasiRNA-ARF pathway is required for corolla tube formation in the monkeyflower species Mimulus lewisii. Loss-of-function mutations in the M. lewisii orthologs of ARGONAUTE7 and SUPPRESSOR OF GENE SILENCING3 cause a dramatic decrease in abundance of TAS3-derived small RNAs and a moderate upregulation of AUXIN RESPONSE FACTOR3 (ARF3) and ARF4, which lead to inhibition of lateral expansion of the bases of petal primordia and complete arrest of the upward growth of the interprimordial regions, resulting in unfused corollas. Using the DR5 auxin-responsive promoter, we discovered that auxin signaling is continuous along the petal primordium base and the interprimordial region during the critical stage of corolla tube formation in the wild type, similar to the spatial pattern of MlARF4 expression. Auxin response is much weaker and more restricted in the mutant. Furthermore, exogenous application of a polar auxin transport inhibitor to wild-type floral apices disrupted petal fusion. Together, these results suggest a new conceptual model highlighting the central role of auxin-directed synchronized growth of the petal primordium base and the interprimordial region in corolla tube formation.

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“…This year has again seen the publication of numerous high quality papers which will contribute to the ongoing success of the journal. Many of these papers were published in several themed issues, focusing on such diverse topics as Neotropical plant evolution (Hughes, Pennington & Antonelli, , resulting from a symposium at the International Botanical Congress in Melbourne), biogeography (Fay & Forest, , to mark the centenary of the death of Alfred Russel Wallace), monocots (two regular issues and a virtual issue of historical papers from the journal to mark the Fifth Monocots Conference held in New York; Fay, 2013a), rosids (Fay, 2013b) and asterids (Schönenberger & von Balthazar, ). In contrast, to conclude the year we have compiled a general issue of 16 papers covering different aspects (including palaeobotany, molecular phylogenetics, morphology, population genetics, phylogeography, reproductive biology) relating to the broad subject area covered by the journal.…”

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confidence: 99%

A botanical Christmas stocking

Fay

2013

Bot J Linn Soc

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Asterids

Cited by 5 publications

References 41 publications

Bridging the gaps: evolution and development of perianth fusion

Bridging the gaps: evolution and development of perianth fusion

Developmental Genetics of Corolla Tube Formation: Role of the tasiRNA-ARF Pathway and a Conceptual Model

A botanical Christmas stocking

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