Inbreeding depression in a rare deceptive orchid

Ferdy, Jean‐Baptiste; Loriot, Sandrine; Sandmeier, M.; Lefranc, Madeleine; Raquin, Christian

doi:10.1139/b01-096

Cited by 23 publications

(24 citation statements)

References 20 publications

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“…The pollination strategy of an orchid (reward pollination versus food or sexual deception) strongly affects its mating system. Deception pollination reduces the chances for geitonogamous pollination and thus promotes outcrossing (Ferdy et al, 2001;Cozzolino and Widmer, 2005). Being a deceptive orchid (Chen and Tsi, 1998), C. goeringii is expected to have a high genetic variation, which is well in accordance with the results reported in the present study.…”

Section: Genetic Diversity Within Populationssupporting

confidence: 91%

Genetic diversity of wild Cymbidium goeringii (Orchidaceae) populations from Hubei based on Inter-simple sequence repeats analysis

Yao

Yang

2007

Front. Biol. China

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Cymbidium goeringii is a diploid and nonrewarding, bumblebee-pollinated species, which is distributed in China, Japan and Korea Peninsula. This species is now highly endangered due to the mass collection and forest clearance in China. In the present study, we investigated the distribution of genetic variation within and between eleven populations of Cymbidium goeringii in central China by using Inter-simple sequence repeats (ISSR) markers. Eleven primers produced a total of 127 clear and reproducible bands of which 112 were polymorphic. High genetic diversity was detected in Cymbidium goeringii for both population level (P = 63.1%; He = 0.194 5) and species level (P = 88.2%; He = 0.262 8). A higher level of genetic differentiation was detected among populations (G ST = 0.244 0, F ST = 0.220 7) with Nei's G ST analysis and analysis of molecular variance (AMOVA), and no correlation was found between geographical and genetic distance. Genetic drift rather than gene flow played an important role in forming the present population structure of Cymbidium goeringii. Limited gene flow among populations and gene drift increase the extinction risk of local populations. Some conservation concerns are therefore discussed together with possible strategies for implementing in situ and ex situ conservation.

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Section: Genetic Diversity Within Populationssupporting

confidence: 91%

Genetic diversity of wild Cymbidium goeringii (Orchidaceae) populations from Hubei based on Inter-simple sequence repeats analysis

Yao

Yang

2007

Front. Biol. China

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“…There are no data on genetic structure within populations of D. pulchra, but in the nonrewarding orchid Cephalanthera longibracteata, relatedness between plants growing closer than 3 m was comparable to that expected for half sibs and first cousins (Chung et al 2004). In another non-rewarding species, Dactylorhiza praetermissa, hand-pollination between plants growing less than 10 m from the mother plant resulted in seeds with a lower proportion of embryos and decreased germination rates than pollination between plants growing at more than 20 m apart (Ferdy et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Lack of floral nectar reduces self-pollination in a fly-pollinated orchid

2005

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One explanation for the widespread absence of floral nectar in many orchids is that it causes pollinators to visit fewer flowers on a plant, and thus reduces self-pollination. This, in turn, could increase fitness by reducing inbreeding depression in progeny and promoting pollen export. The few previous investigations of this hypothesis have all involved bee-pollinated orchids and some have given contradictory results. We studied the effects of adding artificial nectar (sucrose solution) to the spurs of a non-rewarding long-proboscid fly-pollinated orchid, Disa pulchra. Addition of nectar significantly increased the number of flowers probed by flies (2.6-fold), the time spent on a flower (5.4-fold), the number of pollinia removed per inflorescence (4.8-fold) and the proportion of removed pollen involved in self-pollination (3.5-fold). The level of self-pollination increased dramatically with the number of flowers probed by flies. Experimental self-pollination resulted in fruits with only half as many viable seeds as those arising from cross-pollination. Pollinators were more likely to fly long distances (>40 cm) when departing from non-rewarding inflorescences than when departing from rewarding ones. These findings provide support for the idea that floral deception serves to reduce pollinator-mediated self-pollination.

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“…Levin and Bulinska-Radomska, 1988;Latta and Ritland, 1994;Belaoussoff and Shore, 1995;Ferdy et al, 2001;Lofflin and Kephart, 2005) but not of others (e.g. Willis, 1993a;Eckert and Barrett, 1994;Johnston and Schoen, 1996;Goodwillie and Knight, 2006).…”

Section: Populationsmentioning

confidence: 98%

Inbreeding depression and the cost of inbreeding on seed germination

Baskin

2015

Seed Sci. Res.

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We review the literature on effects of inbreeding depression (ID) on seed germination for 743 case studies of 233 species in 64 families. For 216 case studies, we also review the relationship between mass and germination in inbred vs. outbred seeds. Inbred seeds germinated equally well as outbred seeds in 51.1% of 743 case studies, but better than outbred seeds in only 8.1%. In c. 50.5% of 216 cases, mass of inbred seeds was equal to (38.0%) or larger than (12.5%) that of outbred seeds. The magnitude of ID spans most of the 2 1 to þ 1 range for relative performance for germination of inbred vs. outbred seeds; in contrast to what might be expected, seed germinability often is not negatively correlated with the coefficient of inbreeding (F) or positively corrected with population genetic diversity; neither heterosis nor outbreeding depression for germination is common in crosses between populations; and ID in most endemics is low and does not differ from that of widespread congeners. Our results on the effects of ID on seed mass and germination do not agree with the limited number of comparisons Darwin (1876) made on the effects of selfing vs. outcrossing on these two lifehistory traits. Recommendations are made on how to improve dormancy breaking and germination procedures in order to make the results of studies on ID more relevant to the natural world.

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Inbreeding depression in a rare deceptive orchid

Cited by 23 publications

References 20 publications

Genetic diversity of wild Cymbidium goeringii (Orchidaceae) populations from Hubei based on Inter-simple sequence repeats analysis

Genetic diversity of wild Cymbidium goeringii (Orchidaceae) populations from Hubei based on Inter-simple sequence repeats analysis

Lack of floral nectar reduces self-pollination in a fly-pollinated orchid

Inbreeding depression and the cost of inbreeding on seed germination

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