Erratic pollination, high selfing levels and their correlates and consequences in an altitudinally widespread above-tree-line species in the high Andes of Chile

Arroyo, Mary T. K.; Salgado, Sagrario; Henríquez, Carolina A.; Till–Bottraud, Irène; Pérez, Fernánda

doi:10.1016/j.actao.2006.05.006

Cited by 73 publications

(91 citation statements)

References 49 publications

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“…However, total seed set is higher in low-herkogamous compared to high-herkogamous plants, likely due to differences in contribution of seeds produced via autonomous (and perhaps facilitated) selfing. Thus, while the reproductive patterns of the low-herkogamous individuals are in line with the reproductive assurance hypothesis (higher seed set of mixed mating origin; Arroyo et al 2006;Busch and Delph 2006;Eckert et al 2006), the existence of high-herkogamous plants is enigmatic (lower seed set, more consistently outcrossed). Why has selection not eradicated high-herkogamous plants?…”

Section: Simultaneous Effects On Number Of Seeds and Mating Mode Of Smentioning

confidence: 83%

“…The probability of pollination can be heightened through higher floral attractiveness, achieved via more conspicuous floral displays (Müller 1881; Arroyo et al 2006) or greater floral longevity (Bingham and Orthner 1998). Alternatively, pollinator reliance can be reduced by promoting reproductive assurance via autonomous self-pollination (Kalisz and Vogler 2003;Arroyo et al 2006;Eckert et al 2006). Decreased reliance on pollinators requires self-compatibility.…”

Section: Introductionmentioning

confidence: 99%

“…It has long been held that the switch from heterostyly to homostyly is associated with the shift from outcrossing to selfing (Ernst 1955;Barrett 1992). Alpine environments, such as that of P. halleri, are thought to have generally depauperate pollinator faunas, with infrequent and unreliable pollination service compared with environments at the lower elevations, where the heterostylous relatives of P. halleri occur (Müller 1881; Arroyo et al 1982Arroyo et al , 1985Arroyo et al , 2006Bingham and Orthner 1998;Körner 2003). Thus, the evolution of homostyly in P. halleri is at first sight in line with the reduced pollinator reliance hypothesis.…”

Section: Introductionmentioning

confidence: 99%

“…To overcome the challenges associated with limited pollinator service, different adaptive solutions may evolve (Harder and Aizen 2010). Two commonly observed strategies are increasing pollination probability and reducing reliance on pollinators (Arroyo et al 2006). The probability of pollination can be heightened through higher floral attractiveness, achieved via more conspicuous floral displays (Müller 1881; Arroyo et al 2006) or greater floral longevity (Bingham and Orthner 1998).…”

Section: Introductionmentioning

confidence: 99%

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Mixed Mating in Homostylous Species: Genetic and Experimental Evidence from an Alpine Plant with Variable Herkogamy,Primula halleri

Vos

Keller

Zhang

et al. 2018

International Journal of Plant Sciences

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(2018). Mixed mating in homostylous species: genetic and experimental evidence from an alpine plant with variable herkogamy, Primula halleri. Editor: Christina CarusoPremise of research. Self-compatibility is a requirement for reproductive assurance via selfing and may therefore be beneficial in environments with infrequent or unpredictable pollinator service. However, selfcompatible plants may spatially separate anthers from stigmatic surface within flowers (herkogamy), potentially preventing autonomous self-pollination while promoting outcrossing. We investigated the effects of herkogamy on patterns of mating in a self-compatible, homostylous alpine herb, Primula halleri, which evolved from obligately outcrossing, heterostylous ancestors. Primula halleri displays diminishing herkogamy during anthesis, affecting its capacity for self-pollination. Specifically, we tested whether higher herkogamy at the end of anthesis (terminal herkogamy) promotes higher outcrossing rates at the cost of lower seed set, while lower terminal herkogamy ensures seed set via self-pollination at the cost of inbreeding.Methodology. We estimated family-and population-level genetic outcrossing rates in four populations using microsatellites and derived an estimate for inbreeding depression. We tested effects of different levels of terminal herkogamy on means and variances of outcrossing rates. We also assessed whether seed set was resource or pollen limited. We interpreted results in light of previously published data on seed set with and without pollinator-exclusion treatment. Pivotal results. Population-level outcrossing rates ranged between 0.5 and 0.8. Outcrossing rates of plants with higher terminal herkogamy had similar means but lower variances than those of plants with lower terminal herkogamy. This result demonstrates that separation between sexual organs larger than 1 mm in mature flowers favors outbreeding, while below this threshold, delayed selfing ensures reproduction.Conclusions. Contrary to long-held notions about the association of homostyly and selfing, we provide new genetic evidence that the homostylous P. halleri adopts a mixed mating system due to variable herkogamy. Moreover, our results support a trade-off between seed number and seed quality effected through variation in herkogamy, illustrating that herkogamy affects multiple aspects of reproductive fitness simultaneously.

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Section: Simultaneous Effects On Number Of Seeds and Mating Mode Of Smentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Mixed Mating in Homostylous Species: Genetic and Experimental Evidence from an Alpine Plant with Variable Herkogamy,Primula halleri

Vos

Keller

Zhang

et al. 2018

International Journal of Plant Sciences

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“…De las 42 especies que lo componen, 36 se encuentran en Chile y están fuertemente concentradas en la zona de clima mediterráneo y de desierto con lluvias de invierno (Cabrera 1937). Hasta la fecha, todas las especies del género Chaetanthera estudiadas son entomófilas (Arroyo et al 1982), aunque existen diferencias notables en las tasas de visita entre especies (e.g., Arroyo et al 2006). Dentro de este género existe un amplio rango de variación en el tamaño de los capítulos y en los niveles de autocompatibilidad (Arroyo MTK, datos no publicados).…”

Section: Especies De Estudiounclassified

Consecuencias de las variaciones microclimáticas sobre la visita de insectos polinizadores en dos especies de Chaetanthera (Asteraceae) en los Andes de Chile central

Torres-Díaz

Cavieres

Muñoz-Ramírez³

et al. 2007

Rev. chil. hist. nat.

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Clinal variation in quantitative traits but not in evolutionary potential along elevational and latitudinal gradients in the widespread Anthyllis vulneraria

Daco,

Colling,

Matthies

2024

American J of Botany

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PremiseStrong elevational and latitudinal gradients allow the study of genetic differentiation in response to similar environmental changes. However, it is uncertain whether the environmental changes along the two types of gradients result in similar genetically based changes in quantitative traits. Peripheral arctic and alpine populations are thought to have less evolutionary potential than more central populations do.MethodsWe studied quantitative traits of the widespread Anthyllis vulneraria in a common garden. Plants originated from 20 populations along a 2000‐m elevational gradient from the lowlands to the elevational limit of the species in the Alps, and from 20 populations along a 2400‐km latitudinal gradient from the center of the distribution of the species in Central Europe to its northern distributional margin.ResultsMost traits showed similar clinal variations with elevation and latitude of origin, and the magnitude of all measured traits in relation to mean annual temperature was similar. Higher QST values than FST values in several traits indicated diversifying selection, but for others QST was smaller than FST. Genetic diversity of quantitative traits and neutral molecular markers was not correlated. Plasticity in response to favorable conditions declined with elevation and less strongly with latitude of origin, but the evolvability of traits did not.ConclusionsThe clinal variation suggests adaptive differentiation of quantitative traits along the two gradients. The evolutionary potential of peripheral populations is not necessarily reduced, but lower plasticity may threaten their survival under rapidly changing climatic conditions.

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Erratic pollination, high selfing levels and their correlates and consequences in an altitudinally widespread above-tree-line species in the high Andes of Chile

Cited by 73 publications

References 49 publications

Mixed Mating in Homostylous Species: Genetic and Experimental Evidence from an Alpine Plant with Variable Herkogamy,Primula halleri

Mixed Mating in Homostylous Species: Genetic and Experimental Evidence from an Alpine Plant with Variable Herkogamy,Primula halleri

Consecuencias de las variaciones microclimáticas sobre la visita de insectos polinizadores en dos especies de Chaetanthera (Asteraceae) en los Andes de Chile central

Clinal variation in quantitative traits but not in evolutionary potential along elevational and latitudinal gradients in the widespread Anthyllis vulneraria

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