Dicliny in Bouteloua (Poaceae: Chloridoideae): Implications for the Evolution of Dioecy

Kinney, Michael S.; Columbus, J. Travis; Friar, Elizabeth A.

doi:10.5642/aliso.20072301.45

Cited by 13 publications

(23 citation statements)

References 55 publications

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“…Pierce, Pentarrhaphis , and Soderstromia ), primarily to emphasize the diclinous habit. Columbus et al () and Kinney et al () recovered eight and six, respectively, of the 11 species we place in clade H. For the first time, we include B. erecta , B. griffithsii , and B. tamaulipensis along with B. dactyloides , B. diversispicula , B. eludens , B. mexicana , B. multifida , B. polymorpha , B. scabra , and B. varia in a strongly supported clade (Fig. B).…”

Section: Discussionmentioning

confidence: 93%

“…hirsuta. Reeder & Reeder (1966) were first to report gynodioecy in B. chondrosoides, which is sister to B. bracteata and B. dimorpha in our tree, the latter two species formally treated in Opizia J. Presl, a genus with monoecious and dioecious plants (McVaugh, 1983;Kinney et al, 2007). Presl (1830) first described the genus Opizia as having a single species (Opizia stolonifera J. Presl) with hermaphrodite flowers, and dicliny was not noticed in this taxon until Bentham & Hooker (1883) described the spikelets as unisexual with monoecious and dioecious individuals.…”

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confidence: 98%

“…Subtribe Boutelouinae Stapf (Poaceae: Chloridoideae: Cynodonteae) consists of the single genus, Bouteloua, with 60 species (Columbus et al, 1998(Columbus et al, , 2000Columbus, 1999a;Clayton et al, 2006;Kinney et al, 2007;Simon, 2014;Soreng et al, 2015) centered in the southwestern USA and Mexico, including the dominant range grasses, B. gracilis (Kunth) Lag. ex Griffiths (blue grama) and B. dactyloides (Nutt.)…”

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confidence: 99%

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Phylogeny and subgeneric classification of Bouteloua with a new species, B. herrera‐arrietae (Poaceae: Chloridoideae: Cynodonteae: Boutelouinae)

Peterson

Romaschenko

Arrieta

2015

J of Sytematics Evolution

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Bouteloua (Poaceae: Chloridoideae: Cynodonteae; Boutelouiane) is an important genus of forage grasses containing 60 species found primarily in the Americas with a center of diversity in northern Mexico. A modern subgeneric classification is lacking. The goals of our study were to reconstruct the evolutionary history among the species of Bouteloua using molecular data with increased species sampling compared to previous studies. A phylogenetic analysis was conducted on 209 samples, of which 59 species (206 individuals) were in Bouteloua, using two plastid (rpl32‐trnL spacer and rps16‐trnK spacer) and nuclear ITS 1&2 (ribosomal internal transcribed spacer) sequences to infer evolutionary relationships and produce a subgeneric classification. Overall, ITS and plastid phylogenies rendered similar patterns. However, the ITS phylogeny lacked backbone structure, recovering only four internal clades out of nine found in the plastid phylogeny. The ITS network shows a radiative evolutionary pattern and indicates a number of incompatible splits, suggesting past hybridization between species of different sections. The maximum‐likelihood tree from the combined plastid and ITS regions is well resolved and depicts a strongly supported monophyletic Bouteloua that includes ten strongly supported clades and one moderately supported clade. The molecular results support the recognition of 10 sections and two subsections within Bouteloua s.l.; three sections are new: Barbata, Hirsuta, and Trifida; four sections are new combinations: Buchloe, Cyclostachya, Opizia, and Triplathera; and two subsections are new: Eriopoda and Hirsuta. Based on our molecular results and the possession of unique morphological characters we describe a new species from Nuevo León, Bouteloua herrera‐arrietae.

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Section: Discussionmentioning

confidence: 93%

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confidence: 98%

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confidence: 99%

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Phylogeny and subgeneric classification of Bouteloua with a new species, B. herrera‐arrietae (Poaceae: Chloridoideae: Cynodonteae: Boutelouinae)

Peterson

Romaschenko

Arrieta

2015

J of Sytematics Evolution

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“…A few grass clades, such as Bouteloua Lag. (Columbus et al, ; Kinney et al, ) and Poa supersection Homalopoa (Dumort.) Soreng & L.J.…”

Section: Sexual Differentiation In Grass Flowersmentioning

confidence: 99%

Grass flowers: An untapped resource for floral evo‐devo

Schrager‐Lavelle

Klein

Fisher

et al. 2017

J of Sytematics Evolution

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The abrupt origin and rapid diversification of the flowering plants presents what Darwin called "an abominable mystery". Floral diversification was a key factor in the rise of the flowering plants, but the molecular underpinnings of floral diversity remain mysterious. To understand the molecular biology underlying floral morphological evolution, genetic model systems are essential for rigorously testing gene function and gene interactions. Most model plants are eudicots, while in the monocots genetic models are almost entirely restricted to the grass family. Likely because grass flowers are diminutive and specialized for wind pollination, grasses have not been a major focus in floral evo-devo research. However, while grass flowers do not exhibit any of the raucous morphological diversification characteristic of the orchids, there is abundant floral variation in the family. Here, we discuss grass flower diversity, and review what is known about the developmental genetics of this diversity. In particular, we focus on three aspects of grass flower evolution: (1) the evolution of a novel organ identity-the lodicule; (2) lemma awns and their diversity; and (3) the convergent evolution of sexual differentiation. The combination of morphological diversity in the grass family at large and genetic models spread across the family provides a powerful framework for attaining deep understanding of the molecular genetics of floral evolution.

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“…Although Connor (1987) and Connor et al (2000) list 22 and 20 dioecious genera respectively, several are monotypic genera that are now placed in synonymy in Distichlis, a genus in which all species are dioecious, and in Bouteloua, a well supported clade that includes species with almost every conceivable form of dicliny (Kinney et al 2007). The two dioecious species formerly segregated as Neeragostis are now placed in Eragrostis, in which they are the only dioecious members (Ingram and Doyle 2004).…”

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confidence: 99%

Reproductive Systems

Kellogg¹

2015

Flowering Plants. Monocots

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Reproductive systems in the grasses are diverse. This section begins by describing the morphological variation in placement of the stamens and pistils, and then follows with discussion of outcrossing, self-pollination and apomixis. UNISEXUAL VS. BISEXUAL FLOWERSGrasses may have unisexual or bisexual flowers. Because of the distribution of the unisexual versus bisexual condition in the immediate outgroups and early diverging taxa, attempts to determine the ancestral condition for the family are highly sensitive to analytical method and assumptions (Malcomber and Kellogg 2006). Among the graminid Poales, flowers of Flagellariaceae are bisexual, whereas those of Restionaceae, Centrolepidaceae and Anarthriaceae are unisexual. The two immediate outgroups of the grasses, Ecdeiocoleaceae and Joinvilleaceae, have unisexual and bisexual flowers, respectively. In the grasses, flowers in Anomochlooideae are bisexual, but those in Pharoideae are unisexual, and Puelioideae are bisexual. This distribution of character states indicates either that unisexual flowers have arisen repeatedly, or that reversion from unisexual to bisexual is fairly easy over evolutionary time, or both.Virtually all possible arrangements of unisexual flowers on the plant are known in the grasses (Connor 1981(Connor , 1987. Monoecy is widespread, appearing in all Pharoideae, tribe Olyreae of Bambusoideae, many members of Chloridoideae and Panicoideae, and some Ehrhartoideae. Among monoecious grasses, sex expression may vary between flowers within a spikelet (e.g., Lecomtella, Ixophorus), between spikelets within an inflorescence (e.g., Pharus, Hypogynium, Zizania), or between inflorescences within a plant (e. g., Zea, many Olyreae).Andromonoecy is common, particularly in the Panicoideae, in which spikelets are conventionally two-flowered, with the lower flower often producing stamens and the upper one being bisexual. Additional variations on this theme occur in the tribe Andropogoneae, with sex expression varying between the flowers in each of the two spikelets of the spikelet pair. For example, in many species of Andropogon, the sessile spikelet has a sterile lower flower and bisexual upper flower, while the pedicellate spikelet has a sterile lower flower and staminate upper one; this produces an inflorescence of bisexual and staminate flowers in a 1:1 ratio. In other Andropogoneae (e.g., Elymandra), the most proximal spikelet pairs on the inflorescence consist entirely of staminate flowers, thus increasing the ratio of staminate to bisexual flowers.In contrast to andromonoecy, gynomonoecy is rare in the grasses as a whole. Connor (1981) reports only eight genera with this distribution of flower types. In two of these, the bambusoids Diandrolyra and Piresia, the apparently bisexual flowers are in fact staminate with the gynoecium non-functional; thus, the plants are actually monoecious. In the chloridoid genus Munroa, pistillate flowers are proximal to bisexual ones in the spikelets of most species, but in M. squarrosa, pistillate spikelets occur only...

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Dicliny in Bouteloua (Poaceae: Chloridoideae): Implications for the Evolution of Dioecy

Cited by 13 publications

References 55 publications

Phylogeny and subgeneric classification of Bouteloua with a new species, B. herrera‐arrietae (Poaceae: Chloridoideae: Cynodonteae: Boutelouinae)

Phylogeny and subgeneric classification of Bouteloua with a new species, B. herrera‐arrietae (Poaceae: Chloridoideae: Cynodonteae: Boutelouinae)

Grass flowers: An untapped resource for floral evo‐devo

Reproductive Systems

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