PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN
            <i>PHLOX</i>

Levin, Donald A.

doi:10.1111/j.1558-5646.1989.tb02556.x

Cited by 30 publications

(13 citation statements)

References 26 publications

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“…Despite differences in these species' flower colors (Levin and Schaal, 1970;Levin, 1985) and limited pollen dispersal distance (Levin and Kerster, 1974;Levin 1981Levin , 1989b, pollen is dispersed to heterospecific stigmas, as evidenced by interspecific pollinator visitation and the existence of hybrids in natural populations (Erbe and Turner, 1962;Levin, 1967Levin, , 1975Ferguson et al, 1999; L. Ruane, personal observation). The formation of hybrids is encouraged by P. cuspidata's and P. drummondii's coinciding flowering intervals (from early March to late May) and their mutual use of lepidopteran pollinators (Erbe and Turner, 1962;Grant and Grant, 1965;Levin, 1967Levin, , 1970Levin, , 1975.…”

Section: Methodsmentioning

confidence: 99%

Environmental effects on pollen–pistil compatibility between Phlox cuspidata and P. drummondii (Polemoniaceae): implications for hybridization dynamics

Ruane

Donohue

2007

American J of Botany

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Postpollination mechanisms of reproductive isolation can critically influence the amount of gene flow between hybridizing species. While much evidence exists for genetically based pollen-pistil incompatibility, we show that environmental variation also influences the postpollination performance of heterospecific pollen in the annual Phlox hybrid system. Thus, the environmental segregation of species can influence hybridization dynamics. We found that P. cuspidata was restricted to soils of low Ca concentrations in the field and performed better under experimentally low Ca; P. drummondii was able to inhabit high-Ca soils and sometimes performed better in this environment. To determine whether soil Ca influenced pollen-pistil compatibility in a manner that alters pollen siring success, single-donor pollinations were performed in a completely factorial crossing design between species, maternal Ca environments, and paternal Ca environments. Maternal and paternal environments interacted in their effects on pollen-pistil compatibility for both inter- and intraspecific crosses, such that pollen performance was highest when mothers and fathers were grown in different soil Ca environments. These results suggest that when Phlox species predictably inhabit different environments, environmental heterogeneity can impede the processes of speciation and local adaptation by enhancing the performance of pollen dispersed across species and environments.

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Section: Methodsmentioning

confidence: 99%

Environmental effects on pollen–pistil compatibility between Phlox cuspidata and P. drummondii (Polemoniaceae): implications for hybridization dynamics

Ruane

Donohue

2007

American J of Botany

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“…Even under levels of deposition of conspecific pollen sufficient to ensure full seed set in SC plants, the expression of SI may reduce reproduction if a substantial fraction of the pollen received is incompatible. SI expression may inhibit reproduction within local neighborhoods of structured populations (Levin 1989;Byers and Meagher 1992;Goodell et al 1997). Even after deposition, self pollen may directly interfere with outcross pollen by reducing germination rates or pollen tube growth (Ockendon and Currah 1977;Bertin and Sullivan 1988;Galen et al 1989;Ramsey and Vaughton 2000) or promoting flower abscission or fruit abortion (Becerra and Lloyd 1992;Morse 1994;Vogler and Stephenson 2001).…”

Section: Pollen Limitation Disfavors Self-incompatibilitymentioning

confidence: 99%

“…In particular, the history of duplication or polyploidization in C. rapunculoides suggested by allozyme segregation patterns (Vogler and Stephenson 2001) may indicate that partial breakdown of SI in this species merely represents a by-product of the duplication of part of the S-locus. Alternatively, attenuation of SI expression may directly confer selective advantages in this species, which commonly resides in small, isolated populations (Vogler et al 1999), conditions shown to be associated with low cross-compatibility (Levin 1989;Byers and Meagher 1992;Goodell et al 1997). Indeed, the existence of many possible points of control of SI expression (McClure et al 2000;Cruz-García et al 2003) and the demonstrated heritability of age-dependent breakdown in this species (Good-Á vila and Stephenson 2002) suggest that partial SI expression may represent an adaptation and not merely a transient condition.…”

Section: Evolutionary Significance Of Incomplete Self-incompatibilitymentioning

confidence: 99%

On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

Vallejo‐Marín

Uyenoyama

2004

Evolution

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Pollen limitation affects plants with diverse reproductive systems and ecologies. In self-incompatible (SI) species, pollen limitation may preclude full reproductive compensation for prezygotic rejection of pollen. We present a model designed to explore the effects of incomplete reproductive compensation on evolutionary changes at a modifier locus that regulates the level of SI expression. Our results indicate that incomplete reproductive compensation greatly increases the evolutionary costs of SI, particularly in populations with low S-allele diversity. The evolutionary fate of modifiers of SI expression depends on the rate at which they are transmitted to future generations as well as the effects of SI on offspring number and quality. Partial SI expression can represent a stable condition rather than an evolutionarily transient state between full expression and full suppression. This unanticipated result provides the first theoretical support for the evolutionary stability of such mixed mating systems, the existence of which has recently been documented.

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“…Plants in large populations may receive more compatible pollen than plants in small populations because large populations have greater mating-type diversity (DeMauro 1993). Alternatively, plants with many nearby neighbors may receive a greater proportion of compatible pollen compared to plants with few nearby neighbors because nearest neighbors tend to be mating-incompatible (Levin 1989). Habitat fragmentation is expected to reduce the local abundance both of individuals and of populations, resulting in a correlation of fragmentation measures across scales (Kunin 1997b).…”

Section: Introductionmentioning

confidence: 99%

SCALE DEPENDENCE OF REPRODUCTIVE FAILURE IN FRAGMENTED Echinacea POPULATIONS

Wagenius

2006

Ecology

110

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I investigated reproduction in a three-year study of Echinacea angustifolia, purple coneflower, growing in a fragmented prairie landscape. I quantified the local abundance of flowering conspecifics at individual-based spatial scales and at a population-based spatial scale. Regression analyses revealed that pollen limitation increased while seed set and fecundity decreased with isolation of individual plants. Isolation, defined as the distance to the k(th) nearest flowering conspecific, was a good predictor of pollen limitation, for all nearest neighbors considered (k = 1-33), but the strength of the relationship, as quantified by R2, peaked at intermediate scales (k = 2-18). The relationship of isolation to seed set and fecundity was similarly strongest at intermediate scales (k = 3-4). The scale dependence of individual density effects on reproduction (density of flowering plants within x meters) resembled that of isolation. Analyses at a population-based scale showed that pollen limitation declined significantly with population size. Seed set and fecundity also declined with population size, but significantly so only in 1998. Whether quantifying local abundance with population- or individual-based measures, reproductive failure due to pollen limitation is a consistent consequence of Echinacea scarcity. However, individual-based measures of local abundance predicted pollen limitation from a wider sample of plants with a simpler model than did population size. Specifically, the largest site, a nature preserve, is composed of plants with intermediate individual isolation and, as predicted, intermediate pollen limitation, but its large population size poorly predicted population mean pollen limitation.

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PROXIMITY‐DEPENDENT CROSS‐COMPATIBILITY IN PHLOX

Cited by 30 publications

References 26 publications

Environmental effects on pollen–pistil compatibility between Phlox cuspidata and P. drummondii (Polemoniaceae): implications for hybridization dynamics

Environmental effects on pollen–pistil compatibility between Phlox cuspidata and P. drummondii (Polemoniaceae): implications for hybridization dynamics

On the Evolutionary Costs of Self-Incompatibility: Incomplete Reproductive Compensation Due to Pollen Limitation

SCALE DEPENDENCE OF REPRODUCTIVE FAILURE IN FRAGMENTED Echinacea POPULATIONS

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