STUDIES OF <i>LYTHRUM SALICARIA</i> I. THE EFFICIENCY OF SELF‐POLLINATION

Stout, A. B.

doi:10.1002/j.1537-2197.1923.tb05740.x

Cited by 21 publications

(1 citation statement)

References 2 publications

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“…Among our study populations, population sizes ranged from 8-187 individuals with a wide range of morph frequencies (Table 1). Second, controlled pollination studies have consistently revealed that L. salicaria exhibits partial trimorphic incompatibility, with plants of the M-morph more often self-compatible and those of the S-morph most strongly self-incompatible (Darwin 1864;Stout 1923;O'Neil 1994;Mal et al 1999;Colautti et al 2010;Balogh and Barrett 2018). This variation in demography and incompatibility expression raised the question of whether these features might influence patterns of mating and fertility.…”

Section: Discussionmentioning

confidence: 99%

The influence of floral morph ratios and low plant density on mating and fertility in a tristylous colonizing species

Balogh

Barrett

2018

Botany

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Sexual reproduction in heterostylous populations may be vulnerable to demographic conditions because of the small number of mating types in populations. Here, we investigate mating and fertility under natural and experimental conditions in tristylous Lythrum salicaria L., an invasive species that exhibits a wide range of floral morph ratios and demographic contexts. We grew 147 open-pollinated seed families from six populations with different morph structures to estimate intermorph mating (d). In a field experiment, we used progeny ratios from 47 spatially isolated individuals to estimate d, and measured the intensity of pollen limitation experienced by the morphs. The M- and S-morphs experienced high rates of d, regardless of population size or morph ratio. Estimates for the L-morph revealed low levels of intramorph mating in three dimorphic and two trimorphic populations, but near complete intramorph mating in a monomorphic population. Despite high levels of intermorph mating in the field experiment, the morphs experienced significant pollen limitation of fruit and seed set, but this did not differ in intensity among the morphs. Our field experiment demonstrates that although plant isolation was associated with pollen limitation of seed set, “long-distance” bee-mediated pollen flow served to maintain intermorph mating. Tristyly in L. salicaria is remarkably robust to the demographic variation associated with colonization.

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Section: Discussionmentioning

confidence: 99%

The influence of floral morph ratios and low plant density on mating and fertility in a tristylous colonizing species

Balogh

Barrett

2018

Botany

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Variation in Male and Female Reproductive Success Among Floral Morphs in the Tristylous Plant Lythrum Salicaria (Lythraceae)

O’Neil

1992

American J of Botany

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The purpose of this study was to assess variation in male and female reproductive success among the three morphs of the tristylous plant, Lythrum salicaria. Fluorescent dyes were used as pollen analogs to determine whether morphs differ in their abilities to donate and receive pollen, and actual and potential seed set was measured with a hand pollination experiment. Dye transfer among morphs was highly asymmetric, with more frequent transfer from the short‐styled morph to the long‐ and mid‐styled morphs. This suggests that shorts are performing better at pollen donation and longs and mids are performing better at pollen receipt. All flowers on 95 plants were hand pollinated to test whether female reproductive success is more pollen‐limited in the short‐styled morph than in other morphs. Hand‐pollinated short‐styled plants had significantly higher total seed mass and more seeds per capsule than short controls, whereas hand pollination failed to increase seed set in long and mid morphs. As predicted, short‐styled morphs showed significant pollen limitation, whereas seed set in long‐ and midstyled morphs was not pollen‐limited. Thus, in Lythrum salicaria asymmetrical pollen flow generates morph‐specific differences in male and female fitness.

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Genetic incompatibility and offspring quality in the tristylous plant Lythrum salicaria (Lythraceae)

O’Neil

1994

American J of Botany

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The purpose of this study was to determine the incompatibility relationships among the three different morphs of the tristylous plant Lythrum salicaria, and to assess whether there are fitness consequences to breakdown in incompatibility. Twenty‐four different types of pollinations were performed using all possible combinations of anthers and stigmas. These can be grouped as legitimate pollinations (pollinations from the appropriate anther level of a compatible morph), illegitimate intermorph pollinations (pollinations from the inappropriate anther level of a compatible morph), intramorph pollinations (pollinations between individuals of the same morph), and self pollinations. Legitimate pollinations produced significantly more seed than illegitimate intermorph pollinations, intramorph pollinations, and self pollinations. The difference between legitimate and illegitimate intermorph pollination success is particularly interesting because pollen for these crosses came from the same genetic individual. Pollination types also differed in offspring quality. In the rare examples where progeny were produced by illegitimate intermorph pollinations, the progeny did not have significantly lower values for seedling growth traits compared to legitimate progeny. Seedlings produced by self pollinations had significantly lower values for four out of six seedling growth traits measured. Comparisons of legitimate and self progeny traits indicate that inbreeding depression for most traits is close to or above 0.5. The finding that some seed were produced from illegitimate pollinations suggests that there is variation among individuals in incompatibility. There was a significant effect of parental morph type on the probability of breakdown in incompatibility with the midstyled maternal parents setting more seed from illegitimate pollinations.

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STUDIES OF LYTHRUM SALICARIA I. THE EFFICIENCY OF SELF‐POLLINATION

Cited by 21 publications

References 2 publications

The influence of floral morph ratios and low plant density on mating and fertility in a tristylous colonizing species

The influence of floral morph ratios and low plant density on mating and fertility in a tristylous colonizing species

Variation in Male and Female Reproductive Success Among Floral Morphs in the Tristylous Plant Lythrum Salicaria (Lythraceae)

Genetic incompatibility and offspring quality in the tristylous plant Lythrum salicaria (Lythraceae)

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