New Species of Bee-Pollinated Castilleja from Peru, with a Taxonomic Revision of South American Members of subg. Colacus

Chuang, T. I.; Heckard, Lawrence R.

doi:10.2307/2419482

Cited by 5 publications

(44 citation statements)

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“…In cases of homoploid hybrid speciation, it is generally unlikely to see strict additivity at all loci in the absence of asexual reproduction, particularly in outcrossing species where introgression, F1s and F2s may all have contributed to the stabilized hybrid species ( Soltis and Soltis, 2009 ). Castilleja is typically an outcrossing genus (though see Chuang and Heckard, 1992 ) and known for the ease with which species hybridize, so the question remains as to why both parental copies of the waxy gene are found in all individuals of C. christii. While we cannot directly address this question with the single-locus data presented in this study, a reasonable explanation as to why each C. christii individual sequenced had both parental copies of the waxy gene may be that unequal crossover during meiosis resulted in chromosomal recombinations ( Leister, 2004 ).…”

Section: Comparison Of Morphological Traits In Castilleja Christiimentioning

confidence: 99%

Homoploid hybrid speciation in a rare endemicCastillejafrom Idaho (Castilleja christii, Orobanchaceae)

Clay

Novak

Serpe

et al. 2012

American J of Botany

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• Premise of the study: Hybridization is an important evolutionary force in the history of angiosperms; however, there are few examples of stabilized species derived through homoploid hybrid speciation. Homoploid hybrid species are generally detected via the presence of genetic additivity of parental markers, novel ecological and spatial distinctions, and novel morphological traits, all of which may aid in the successful establishment of hybrid species from parental types. Speciation and diversification within the genus Castilleja (Orobanchaceae) has been attributed to high levels of hybridization and polyploidy, though currently there are no examples of homoploid hybrid speciation within the genus. We employed multiple lines of evidence to examine a putative hybrid origin in C. christii, a rare endemic, known only from 80 hectares at the summit of Mt. Harrison (Cassia Co., Idaho).• Methods: We used granule‐bound starch synthase II (waxy) sequences and 26 morphological characters to address hybridization between C. christii and widespread congeners C. miniata and/or C. linariifolia in an area of sympatry. Chromosomes of C. christii were also counted for the first time.• Key results: All 230 direct‐sequenced C. christii individuals had the additive genomes of both C. miniata and C. linariifolia. Castilleja christii shares traits with both parents but also has floral characters that are unique and transgressive. Cytological counts indicated that all three taxa are diploid.• Conclusions: We conclude that C. christii is a stabilized homoploid hybrid derivative of C. linariifolia and C. miniata and is likely following an independent evolutionary trajectory from its progenitors.

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Section: Comparison Of Morphological Traits In Castilleja Christiimentioning

confidence: 99%

Homoploid hybrid speciation in a rare endemicCastillejafrom Idaho (Castilleja christii, Orobanchaceae)

Clay

Novak

Serpe

et al. 2012

American J of Botany

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“…1 ). In northern Peru, the distributions of these species overlap signifi cantly, and they are often seen growing close to each other with no evidence of hybridization ( Chuang and Heckard, 1992 ;D. This species is distinguished morphologically from the other Peruvian annuals in its low stature (mostly < 10 cm tall vs. up to ~50 cm for the other annuals) and compact infl orescence.…”

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“…Oncorhynchus were all newly described by Chuang and Heckard (1992) . Oncorhynchus were all newly described by Chuang and Heckard (1992) .…”

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“…Oncorhynchus were all newly described by Chuang and Heckard (1992) . Of these species, C. alpicola is the most restricted in its range and is only known from the type locality in northern Peru ( Chuang and Heckard, 1992 ), where it grows among limestone outcrops at ~4000 m a.s.l. 1 ).…”

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“…Castilleja peruviana is distributed in northern Peru and is very similar morphologically to C. vadosa ( Fig. The fi nal species described by Chuang and Heckard (1992) , C. profunda , is found along the Cordillera Occidental from central (near Lima) to southern Peru. In northern Peru, the distributions of these species overlap signifi cantly, and they are often seen growing close to each other with no evidence of hybridization ( Chuang and Heckard, 1992 ;D.…”

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The evolutionary origin of a second radiation of annual Castilleja (Orobanchaceae) species in South America: The role of long distance dispersal and allopolyploidy

Tank

Olmstead

2009

American J of Botany

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Considerable attention has been directed toward understanding the wide gaps in range that are common among many groups of closely related organisms. By placing their biology and geography in a phylogenetic context, we may gain a broader knowledge of the series of historical events that have led to present species distributions. In addition to the North American annuals, a second radiation of annual Castilleja species is in Andean Peru and central Chile. Phylogenetic analyses of chloroplast and nuclear DNA regions revealed a complex history for the origin and diversification of annual Castilleja species in South America. In addition to at least three independent long-distance dispersal events from North America, allopolyploidy has played a significant role in this disjunct radiation. Only C. attenuata occurs in both California and South America, and these results support its recent arrival to central Chile. Two Peruvian species are inferred to be allopolyploids; hybridization between annual lineages derived from independent long-distance dispersal events from North America gave rise to C. profunda, and hybridization between South American annual and perennial species gave rise to C. cerroana. The relative importance these events are discussed with reference to the observed morphological, ecological, and distributional patterns.

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Reproductive trade-offs maintain bract color polymorphism in Scarlet Indian paintbrush (Castilleja coccinea)

Kim¹,

Zaya²,

Fant³

et al. 2019

PLoS ONE

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Populations of scarlet Indian paintbrush (Castilleja coccinea) in the Midwestern United States exhibit a bract color polymorphism, with each population having predominantly yellow or scarlet bracts. We investigated a possible mechanism for this maintenance of bract color polymorphism in C. coccinea by conducting hand-pollination experiments in two nearby populations, one predominantly yellow and one predominantly scarlet. The hand-pollination treatments were either self-pollination or cross pollination using pollen from within and between populations. Both color morphs were used as pollen donors for the within and between crosses. We found that both color morphs of C. coccinea were self-compatible. When the scarlet morph was the maternal plant it had higher seed set. When pollinators were excluded, the yellow morph outperformed the scarlet morph in fruit set and seed set. The apparent trade-offs between a higher reproductive output in the scarlet morph and a reproductive assurance advantage in the yellow morph may explain the maintenance of the polymorphism in C. coccinea. While many previous studies have provided evidence for pollinator preference playing a role in floral color polymorphism, the results of the current study indicate that reproductive assurance, which would be important for fluctuations in pollinator abundance or colonizing new areas, may act as a selective agent to maintain such polymorphisms.

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New Species of Bee-Pollinated Castilleja from Peru, with a Taxonomic Revision of South American Members of subg. Colacus

Cited by 5 publications

References 0 publications

Homoploid hybrid speciation in a rare endemicCastillejafrom Idaho (Castilleja christii, Orobanchaceae)

Homoploid hybrid speciation in a rare endemicCastillejafrom Idaho (Castilleja christii, Orobanchaceae)

The evolutionary origin of a second radiation of annual Castilleja (Orobanchaceae) species in South America: The role of long distance dispersal and allopolyploidy

Reproductive trade-offs maintain bract color polymorphism in Scarlet Indian paintbrush (Castilleja coccinea)

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