Effect of inbreeding on autogamy in Phlox

Levin, Donald A.

doi:10.1038/hdy.1995.13

Cited by 5 publications

(5 citation statements)

References 46 publications

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“…solstitialis populations that contain individuals that are partially self-compatible were identified in our study and in other studies (Harrod and Taylor 1995, Maddox et al 1996, Sun and Ritland 1998. Recent findings indicate that small levels of self-compatibility in predominantly self-incompatible species may be increased by environmental stress and inbreeding (Levin 1995, Hiscock 2000. Strong selection for self-compatibility in C. solstitialis may result in satellite populations sustained by higher rates of self-compatibility than exist in larger core populations.…”

Section: Breeding Systems and Invasivenesssupporting

confidence: 74%

Testing Life History Correlates of Invasiveness Using Congeneric Plant Species

Gerlach

Rice

2003

Ecological Applications

116

111

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We used three congeneric annual thistles, which vary in their ability to invade California (USA) annual grasslands, to test whether invasiveness is related to differences in life history traits. We hypothesized that populations of these summer‐flowering Centaurea species must pass through a demographic gauntlet of survival and reproduction in order to persist and that the most invasive species (C. solstitialis) might possess unique life history characteristics. Using the idea of a demographic gauntlet as a conceptual framework, we compared each congener in terms of (1) seed germination and seedling establishment, (2) survival of rosettes subjected to competition from annual grasses, (3) subsequent growth and flowering in adult plants, and (4) variation in breeding system. Grazing and soil disturbance is thought to affect Centaurea establishment, growth, and reproduction, so we also explored differences among congeners in their response to clipping and to different sizes of soil disturbance. We found minimal differences among congeners in either seed germination responses or seedling establishment and survival. In contrast, differential growth responses of congeners to different sizes of canopy gaps led to large differences in adult size and fecundity. Canopy‐gap size and clipping affected the fecundity of each species, but the most invasive species (C. solstitialis) was unique in its strong positive response to combinations of clipping and canopy gaps. In addition, the phenology of C. solstitialis allows this species to extend its growing season into the summer—a time when competition from winter annual vegetation for soil water is minimal. Surprisingly, C. solstitialis was highly self‐incompatible while the less invasive species were highly self‐compatible. Our results suggest that the invasiveness of C. solstitialis arises, in part, from its combined ability to persist in competition with annual grasses and its plastic growth and reproductive responses to open, disturbed habitat patches. Corresponding Editor: D. P. C. Peters.

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Section: Breeding Systems and Invasivenesssupporting

confidence: 74%

Testing Life History Correlates of Invasiveness Using Congeneric Plant Species

Gerlach

Rice

2003

Ecological Applications

116

111

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“…Self-fertility in weak SI families increased slightly in day-1 flowers and decreased slightly in day-4 flowers, but individual families differed greatly in their response to inbreeding. This suggests that self-fertility can respond in various ways to inbreeding, concordant with other studies that have found both increases (Robacker and Ascher, 1978;Dana and Ascher, 1985;Levin, 1995) and decreases (Wilsie, 1958;Krebs and Hancock, 1990) in self-fertility in response to inbreeding in partially SI species. The tendency for weak SI families to decline in self-fertility with inbreeding, combined with high overall levels of inbreeding depression, show that it is unlikely the species could become highly selffertile or even practice repeated generations of self-fertilization.…”

Section: Discussionsupporting

confidence: 91%

Effects of inbreeding on male function and self‐fertility in the partially self‐incompatible herb Campanula rapunculoides (Campanulaceae)

Good‐Avila

Nagel

Vogler

et al. 2003

American J of Botany

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We examined the effect of inbreeding on fitness (through both male and female functions) and changes in self-fertility in the partially self-incompatible species Campanula rapunculoides. Individuals in natural populations of C. rapunculoides varied extensively in their strength of self-incompatibility (SI). We crossed 11 individuals that differed in their strength of SI to generate families with four levels of inbreeding (f = 0.0, 0.25, 0.5, and 0.75). Progeny were scored for three traits related to male fitness and for outcrossed and selfed seed production. Analyses of variance revealed significant inbreeding depression for the three male traits and seed set. Families with strong or weak SI differed in their response to inbreeding. Families with weak SI had lower levels of inbreeding depression for most traits than families with strong SI, but strong SI families had a greater increase in selfed seed set, but not self-fertility, with inbreeding. Finally, we found evidence of a significant linear response to inbreeding for all three male reproductive traits and outcrossed seed, indicating that inbreeding depression was primarily caused by partially or fully recessive deleterious alleles. Variation in genetic load was associated with variation in self-fertility, a finding that suggests an evolutionary role for partial self-fertility in natural populations of C. rapunculoides.

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“…A reduction in heterozygosity per se may increase the penchant for selfing in predominantly outcrossing plants. Increased selfing following inbreeding has been demonstrated in Secale cereale (Lundquist, 1960), Agrostis tenuis (Antonovics, 1968), Nemesia strumosa (Henny and Ascher, 1976), Petunia integrifolia (Dana and Ascher, 1985), Senecio squalidus (Hiscock, 2000), Solanum caroliniense (Mena-Ali et al, 2008) and in Phlox drummondii (Levin, 1995).…”

Section: Increased Selfing Due To Inadequate Pollen Receiptmentioning

confidence: 99%

Mating system shifts on the trailing edge

Levin

2011

Annals of Botany

107

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Small populations on the trailing edge are especially vulnerable to environmental change because of inadequate levels of cross-fertilization. Evidence is presented that a deficiency of cross-seed production is due to inadequate pollinator services and a paucity of self-incompatibility alleles within populations. Evidence also is presented that if plants are self-compatible, self-fertilization may compensate in part for this deficiency through a stress-induced increase in levels of self-compatibility and stress-induced alterations in floral morphology that elevate self-pollination. Whereas increased self-fertility may afford populations the time to adapt to their changing environments, it can be concluded that increased selfing is not a panacea for the ills of environmental change, because it will lead to substantial reductions in genetic diversity, which may render adaptation unlikely.

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Effect of inbreeding on autogamy in Phlox

Cited by 5 publications

References 46 publications

Testing Life History Correlates of Invasiveness Using Congeneric Plant Species

Testing Life History Correlates of Invasiveness Using Congeneric Plant Species

Effects of inbreeding on male function and self‐fertility in the partially self‐incompatible herb Campanula rapunculoides (Campanulaceae)

Mating system shifts on the trailing edge

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