Pollen Germination and Tube Growth in Selfing and Outcrossing Populations of Clarkia tembloriensis (Onagraceae)

Smith‐Huerta, Nancy L.

doi:10.1086/297341

Cited by 26 publications

(29 citation statements)

References 13 publications

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“…; Alvarez ). The analogous prediction in plants—that highly outcrossing (i.e., relatively “promiscuous”) taxa will evolve faster‐growing male gametophytes than closely related self‐fertilizing taxa—has been reported in a few taxa (Smith‐Huerta ; Diaz and Macnair ; Kerwin and Smith‐Huerta ; Taylor and Williams ; Hove and Mazer ), but the interpretation of these studies is somewhat problematic because several factors other than mating history may influence pollen performance and must be accounted for when comparing taxa.…”

Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 85%

“…Diaz and Macnair ), or on the number of tubes reaching a given distance within a given time period (cf. Smith‐Huerta ; Kerwin and Smith‐Huerta ). This study also provides the first assessment of the difference between using LLT versus mean PTGR when comparing taxa with respect to PTGR.…”

Section: Discussionmentioning

confidence: 99%

“…; Shimizu and Tsuchimatsu ; Schneider and Mazer ). Few studies have investigated the effects of mating system on pollen performance (Smith‐Huerta ; Kerwin and Smith‐Huerta ; Taylor and Williams ; Hove and Mazer ), but it has been proposed that intrasexual selection should cause traits that affect the competitive ability of male gametophytes to diverge between outcrossing versus regularly self‐pollinating taxa (Mazer et al. ).…”

Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 99%

“…To date, no studies have compared pollen performance between species with contrasting mating systems in a uniform environment while controlling for variation among populations and for the effects of pollen load, SPR, temperature, and pollen type (self vs. outcross); here, we examined all of these sources of variation. In addition, unlike previous studies (Smith‐Huerta ; Diaz and Macnair ; Kerwin and Smith‐Huerta ; Taylor and Williams ; Hove and Mazer ), we tested for species differences in PTGR using two estimates of this trait. First, we estimated the mean PTGR based on the distance traveled by each pollen tube visible in each style and, second, we estimated PTGR from the length of the longest tube (LLT) in each style.…”

Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 99%

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Divergence in pollen performance between Clarkia sister species with contrasting mating systems supports predictions of sexual selection

et al. 2018

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Animal taxa that differ in the intensity of sperm competition often differ in sperm production or swimming speed, arguably due to sexual selection on postcopulatory male traits affecting siring success. In plants, closely related self- and cross-pollinated taxa similarly differ in the opportunity for sexual selection among male gametophytes after pollination, so traits such as the proportion of pollen on the stigma that rapidly enters the style and mean pollen tube growth rate (PTGR) are predicted to diverge between them. To date, no studies have tested this prediction in multiple plant populations under uniform conditions. We tested for differences in pollen performance in greenhouse-raised populations of two Clarkia sister species: the predominantly outcrossing C. unguiculata and the facultatively self-pollinating C. exilis. Within populations of each taxon, groups of individuals were reciprocally pollinated (n = 1153 pollinations) and their styles examined four hours later. We tested for the effects of species, population, pollen type (self vs. outcross), the number of competing pollen grains, and temperature on pollen performance. Clarkia unguiculata exhibited higher mean PTGR than C. exilis; pollen type had no effect on performance in either taxon. The difference between these species in PTGR is consistent with predictions of sexual selection theory.

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Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 99%

Section: Consequences Of Mating System For Sexual Selectionmentioning

confidence: 99%

See 2 more Smart Citations

Divergence in pollen performance between Clarkia sister species with contrasting mating systems supports predictions of sexual selection

et al. 2018

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“…In case they do so to the extent of neutralizing the advantage of prior pollination by self-pollen, it will impose cryptic selfincompatibility (Snow and Spira 1991). Such pistils mostly yield out-crossed seed (Weller and Ornduff 1977;Bowman 1987;Jones 1994;Smith-Huerta 1996). One cannot rule out the competition between self-and cross-pollen and their pollen tubes, which is inherent in natural mixed pollination.…”

Section: Discussionmentioning

confidence: 99%

Sex expression and breeding strategy in Commelina benghalensis L.

Kaul

Koul

2009

J Biosci

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This paper describes the results of a series of experiments conducted to unravel the patterns of sex expression and reproductive output in a fascinating species with high variation in sexuality. Commelina benghalensis L., an andromonoecious rainy season weed, bears male and bisexual flowers in axillary spathes of all the plants investigated. Bisexual flowers are of two types; chasmogamous (CH) and cleistogamous (CL). The former are borne on subaerial and the latter on subterranean shoots, in addition to those on aerial spathes. Three populations of the species, designated JU1, JU2 and JU3, were scanned for three consecutive years from 1996 to 1998, and the number and distribution of male, CH and CL flowers per plant were found to vary. The mere number of CH/CL flowers per plant is by itself not an accurate measure of mixed mating. It is necessary to confirm that CH flowers actually outcross and, if they do so, to what extent. Comparison of the pollen/ovule (P/O) ratio and percentage pollen germination on the stigmas of the CH and CL flowers have been used as indices of the pollination system. Confirmation of this was sought from the fruit and seed sets obtained after manual pollination of emasculated flowers with self- and cross-pollen. Results so obtained were compared with those of natural pollination. In the majority of CH flowers, the male and female reproductive phases (i.e. anther dehiscence and stigma receptivity) overlap, providing for self-pollination. However, two exceptions to this general behaviour were found in some plants of all the three populations. In some CH flowers, the female phase matures prior to anther dehiscence while in others, the anthers are sterile. Such plants, designated as variants 1 and 2, respectively, facilitate cross-pollination. While the CL flowers contribute to the production of selfed progeny, the variants of CH ones permit formation of outcrossed progeny, indicating a mixed mating strategy in C. benghalensis.

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Pollen performance decreases with plant age for outcrosser but not selfer: evidence for cost of male performance

Malagon

Roche

McElderry

et al. 2019

American J of Botany

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The deterioration in functions with age, a phenomenon termed senescence, is prevalent across the tree of life (Jones et al., 2014). Patterns of reproductive senescence vary widely among species with contrasting life histories, but, in general, life histories are considered to have evolved to optimize reproductive success given life expectancy (Williams, 1966; Gadgil and Bossert, 1970; Charnov et al., 2007) and the expected (i.e., seasonal and/or stochastic) progression of environments (Giesel, 1976). The survival-reproduction tradeoff is further complicated in hermaphroditic plants by the balance of male and female roles within individual flowers, as well as the possibility of self-fertilization. Sex allocation theory posits that predominantly self-fertilizing species (hereafter selfers) will allocate a greater proportion of reproductive resources toward fertilized ovule development to produce seeds, while outcrossing species (hereafter outcrossers) will divert more towards pollen production and delivery (Lloyd, 1987; Parker et al., 1995). Underlying both life history and sex allocation theories is the premise that resources are limited, and allocation to one function results in tradeoffs that incur fitness costs (Day and Aarssen, 1997). At the core of the differences between selfing and outcrossing mating systems is the form of pollen delivery. In particular, outcrossers often rely on visitation from animal vectors for pollen

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Pollen Germination and Tube Growth in Selfing and Outcrossing Populations of Clarkia tembloriensis (Onagraceae)

Cited by 26 publications

References 13 publications

Divergence in pollen performance between Clarkia sister species with contrasting mating systems supports predictions of sexual selection

Divergence in pollen performance between Clarkia sister species with contrasting mating systems supports predictions of sexual selection

Sex expression and breeding strategy in Commelina benghalensis L.

Pollen performance decreases with plant age for outcrosser but not selfer: evidence for cost of male performance

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