Limits to Reproductive Success in a Partially Self-Incompatible Herb: Fecundity Depression at Serial Life-Cycle Stages

Manasse, Robin S.; Pinney, K.

doi:10.2307/2409922

Cited by 27 publications

(28 citation statements)

References 16 publications

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“…Moreover, the individual components of inbreeding depression in B. sandvicensis are comparable to those of other angiosperms (usually measured in the glasshouse) whose total inbreeding depression is unknown (Agren and Willson 1991;Assouad et al 1978;Manasse and Pinney 1991;Kohn 1988;Jain 1978). However, some gynodioecious angiosperms show little or no inbreeding depression (Ashman 1992;Eckhart 1992) or selffertilization in hermaphrodites (Eckhart 1992;Krohn 1980), and females appear to be maintained through either a maternal effect on seed' quality or direct developmental/physiological advantage to adults that increases fecundity.…”

Section: Relative Ovule Success Female Frequency and Biparental Inbmentioning

confidence: 67%

Evolution of Unisexuality in the Hawaiian Flora: A Test of Microevolutionary Theory

Schultz

Ganders

1996

Evolution

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Abstract.-The evolution of separate sexes as a means of avoiding self-fertilization requires the controversial coexistence of large inbreeding depression and high selfing rate in the ancestral hermaphrodite population. Fitness components of adult females and hermaphrodites in nature, of their open-pollinated progeny, and of experimental selfs and outcrosses onto hermaphrodites were compared in endemic Hawaiian Bidens sandvicensis, all of whose known populations are gynodioecious, consisting of a mixture of females and hermaphrodites. Multilocus selfing rates of hermaphrodites were also estimated, and sex morph ratio monitored over four seasons in three populations of B. sandvicensis and one population of gynodioecious B. cervicata. Total mean inbreeding depression in seed set (in the glasshouse), germination rate (in an open-air nursery on Kauai), and first year survivorship and fecundity in the field were estimated as 0.94 (SE 0.04), and occurred primarily in drought months. Lower survivorship and fecundity of selfs were partially explained by their consistently smaller size. Open-pollinated seed of females had significantly lower germination rate, proportion flowering, and fecundity than outcrossed progeny of hermaphrodites, suggesting moderate biparental inbreeding in females and a lack of any non-outcrossing advantage to progeny of females. In all fitness components, open-pollinated progeny of hermaphrodites were inferior to those of females and to outcrosses, and in most components were superior to selfs. Total performance of open-pollinated progeny of females relative to those of hermaphrodites was calculated as 2.3 (SE = 0.4), but since inflorescences of females also set 20% to 50% more seed than those of hermaphrodites, their total relative ovule success was estimated as 3.2 (SE = 0.5). If inheritance of male sterility is nuclear, this superiority is sufficient to maintain females in frequencies over 20% in populations, whose actual frequencies ranged from 14% to 33%. In four populations, selfing rates of hermaphrodites, assayed in seedlings, were 0.50, 0.45, 0.25, and 0.30, but since substantial inbreeding depression occurred prior to germination, the mean selfing rate of hermaphrodite ovules exceeded 0.57. Female frequencies were significantly higher in the two populations with higher hermaphrodite selfing rate. These results suggest that inbreeding depression can exert a profound influence on the mating system of self-compatible plants on Hawaii and perhaps other oceanic islands, and can be sufficiently strong to electively favor the elimination of the male function.

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Section: Relative Ovule Success Female Frequency and Biparental Inbmentioning

confidence: 67%

Evolution of Unisexuality in the Hawaiian Flora: A Test of Microevolutionary Theory

Schultz

Ganders

1996

Evolution

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“…Tomita (1931) demonstrated that these embryos, when produced by Crinum latifolium, were viable. Other experiments have shown that these "naked" embryos occurred only during selfing in Crinum erubescens, and were present in nearly 17% of all selfed fruit (Manasse and Pinney, 1991).…”

Section: Natural Historymentioning

confidence: 91%

THE INFLUENCE OF THE MATING SYSTEM ON SEED SIZE VARIATION IN CRINUM ERUBESCENS (AMARYLLIDACEAE)

Manasse

Stanton

1991

Evolution

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Abstract. -We present evidence that extreme seed size variation in fruits of Crinum erubescens (range: 0.1 to 66.5 g per seed) occurs when mating pairs are inbred, either from selling or biparental inbreeding. Several relatively uniform seeds of intermediate size are produced when pollen from several pollen donors is applied simultaneously to a flower. Selfed fruits and some fruits pollinated with a single pollen donor produce both large and small seeds, although selfed fruits produce fewer seeds than outcrossed fruit. These results are contrary to the hypothesis that variation in seed size is attributable to either pollen competition or differential allocation of maternal resource to seeds of different genotypes.

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“…It is also often of interest to know whether inbreeding depression changes through the life cycle (Charlesworth and Charlesworth 1987;Kalisz 1989;Manasse and Pinney 1991). Generally, fitnesses are measured on offspring from the same parents or on the same individuals over a number oflife stages.…”

Section: Detecting Differences Among Life Stagesmentioning

confidence: 99%

On the Measurement of Inbreeding Depression

1994

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Limits to Reproductive Success in a Partially Self-Incompatible Herb: Fecundity Depression at Serial Life-Cycle Stages

Cited by 27 publications

References 16 publications

Evolution of Unisexuality in the Hawaiian Flora: A Test of Microevolutionary Theory

Evolution of Unisexuality in the Hawaiian Flora: A Test of Microevolutionary Theory

THE INFLUENCE OF THE MATING SYSTEM ON SEED SIZE VARIATION IN CRINUM ERUBESCENS (AMARYLLIDACEAE)

On the Measurement of Inbreeding Depression

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