Pollen Deposition, Pollen Tube Growth, Seed Production, and Seedling Performance in Natural Populations of<i>Clarkia unguiculata</i>(Onagraceae)

Németh, Michał; Smith‐Huerta, Nancy L.

doi:10.1086/344549

Cited by 33 publications

(35 citation statements)

References 78 publications

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“…Our study focuses on four diploid taxa that have been the subject of numerous ecological and evolutionary studies (e.g. Nemeth & Smith‐Huerta, 2003; Eckhart et al. , 2004; Gottlieb, 2004; Mazer et al.…”

Section: Methodsmentioning

confidence: 99%

Temporal variation in the pollen:ovule ratios of Clarkia (Onagraceae) taxa with contrasting mating systems: field populations

Delesalle

Mazer

Paz

2007

J of Evolutionary Biology

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Among plants, pairs of selfing vs. outcrossing sister taxa provide interesting systems in which to test predictions concerning the magnitude and direction of temporal changes in sex allocation. Although resource availability typically declines towards the end of the growing season for annual taxa, temporal changes in mating opportunities depend on mating system and should change less in selfing taxa. Consequently, given that the pollen:ovule (P:O) ratio of flowers reflects the investment in (and potential fitness pay‐off due to) male vs. female function, we predicted that the P:O ratio should also be less variable among and within selfers than in closely related outcrossers. To test these predictions, we measured temporal changes in sex allocation in multiple field populations of two pairs of sister taxa in the annual flowering plant genus Clarkia (Onagraceae). In the outcrossing Clarkia unguiculata and the selfing Clarkia exilis, ovule production declined similarly from early to late buds, whereas pollen production remained constant or increased in the outcrosser but remained constant or decreased in the selfer. Consequently, the P:O ratio increased within unguiculata populations but marginally increased or stayed constant in exilis populations. In all populations of the selfing Clarkia xantiana spp. parviflora and the outcrossing C. x. spp. xantiana, both ovule and pollen production per flower declined over time. The effects of these declines on the P:O ratio, however, differed between subspecies. In each xantiana population, the mean P:O ratio did not differ between early and late flowers, although individuals varied greatly in the direction and magnitude of phenotypic change. By contrast, parviflora populations differed in the mean direction of temporal change in the P:O ratio. We found little evidence to support our initial predictions that the P:O ratio of the selfing taxa will consistently vary less than in outcrossing taxa.

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Section: Methodsmentioning

confidence: 99%

Temporal variation in the pollen:ovule ratios of Clarkia (Onagraceae) taxa with contrasting mating systems: field populations

Delesalle

Mazer

Paz

2007

J of Evolutionary Biology

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“…An important feature of random space/resource access is that competition can occur if > 1 pollen tube occupies a style, contrary to the intuition that male gametophytes compete only when pollen receipt exceeds ovule number (e.g. Haldane ; Németh & Smith‐Huerta ; Marshall et al . ).…”

Section: Discussionmentioning

confidence: 97%

The population ecology of male gametophytes: the link between pollination and seed production

2016

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The fate of male gametophytes after pollen reaches stigmas links pollination to ovule fertilisation, governing subsequent siring success and seed production. Although male gametophyte performance primarily involves cellular processes, an ecological analogy may expose insights into the nature and implications of male gametophyte success. We elaborate this analogy theoretically and present empirical examples that illustrate associated insights. Specifically, we consider pollen loads on stigmas as localised populations subject to density-independent mortality and density-dependent processes as they traverse complex stylar environments. Different combinations of the timing of pollen-tube access to limiting stylar resources (simultaneous or sequential), the tube distribution among resources (repulsed or random) and the timing of density-independent mortality relative to competition (before or after) create signature relations of mean pollen-tube success and its variation among pistils to pollen receipt. Using novel nonlinear regression analyses (two-moment regression), we illustrate contrasting relations for two species, demonstrating that variety in these relations is a feature of reproductive diversity among angiosperms, rather than merely a theoretical curiosity. Thus, the details of male gametophyte ecology should shape sporophyte reproductive success and hence the dynamics and structure of angiosperm populations.

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“…There are many reports suggesting that pollen competition may be an important component of natural selection by the way of the process of gametophytic selection [19,56]. Seeds produced under intensive pollen-tube competition had a better germination ratio and better seedling growth than those produced with little or no pollen-tube competition [20]. In S. anglica, there was little pollen-tube competition because of insufficient pollination and thus the seed set was very low.…”

Section: Pollen and Pollinationmentioning

confidence: 99%

“…Pollen grain deposition patterns may vary greatly in natural populations, thus affecting the opportunity of pollen competition for ovules and pollen-tube growth [17][18][19]. Pollen competition could in turn affect seed production, fruit set, and progeny vigor [20]. The second important mechanism that induced low seed set was selfincompatibility [21].…”

Section: Introductionmentioning

confidence: 99%

Protogynous, pollen limitation and low seed production reasoned for the dieback of Spartina anglica in coastal China

Zhi

et al. 2008

Plant Science

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Pollen Deposition, Pollen Tube Growth, Seed Production, and Seedling Performance in Natural Populations ofClarkia unguiculata(Onagraceae)

Cited by 33 publications

References 78 publications

Temporal variation in the pollen:ovule ratios of Clarkia (Onagraceae) taxa with contrasting mating systems: field populations

Temporal variation in the pollen:ovule ratios of Clarkia (Onagraceae) taxa with contrasting mating systems: field populations

The population ecology of male gametophytes: the link between pollination and seed production

Protogynous, pollen limitation and low seed production reasoned for the dieback of Spartina anglica in coastal China

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