Variation in Floral Sex Allocation in Polygonatum odoratum (Liliaceae)

Guitián, Javier; Medrano, Mónica; Oti, José E.

doi:10.1093/aob/mch163

Cited by 30 publications

(29 citation statements)

References 44 publications

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“…For cosexual plants, the pattern is considered to vary with environmental conditions and resources status (commonly associated with plant size), hence, induce to changed fitness contributions through these functions (Freeman et al 1981;Lloyd and Bawa 1984;Brunet 1992;Sakai 2000). Evidence of size or environment mediated sexual investment has been documented in numerous studies (de Jong and Klinkhamer1989; Klinkhamer et al 1997;Wright and Barrett 1999;Ashman et al 2001;Guitián et al 2003;Méndez and Traveset 2003;Guitián et al 2004;Zhao et al 2008). In addition, over evolutionary time, primary sex allocation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Primary floral allocation per flower in 12 Pedicularis (Orobanchaceae) species: significant effect of two distinct rewarding types for pollinators

Zhang

Wang

2011

J Plant Res

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For animal-pollinated hermaphrodite plants, the factors that affect floral allocation were usually assigned to extrinsic (environment) and intrinsic ones (resources status). Few studies focused on the effect of rewarding type of plants (pollen vs. nectar and pollen). In this study, we investigated the variation in floral allocation per flower with respect to two distinct rewarding types for pollinators in 12 Pedicularis species in alpine regions, testing for the effects of species, plant size, and elevation simultaneously. The result showed that the rewarding type affected floral allocation significantly, and there was a female-biased floral allocation pattern in nectarless rewarding species relative to nectar and pollen rewarding ones and provided a new insight into variation in floral allocation. It was discussed with respect to activities and foraging behavior of pollinators on the basis of sex allocation theory. Moreover, environmental conditions (elevation) may also play a relatively important role in determining patterns of variation in floral allocation per flower, whereas plant size may not.

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Section: Introductionmentioning

confidence: 99%

Primary floral allocation per flower in 12 Pedicularis (Orobanchaceae) species: significant effect of two distinct rewarding types for pollinators

Zhang

Wang

2011

J Plant Res

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“…Many organisms partition reproductive output into male and female components. Simultaneous or synchronous and sequential or successive hermaphrodites may vary resource allocation to male and female gamete production (Charnov 1982, Hughes et al 2002b, Guitian et al 2004. Therefore, simultaneous hermaphrodites offer a unique opportunity to directly assess optimal investment of resources into male and female reproduction.…”

Section: Introductionmentioning

confidence: 99%

Self-fertilization as an alternative mode of reproduction in the solitary tunicate Pyura chilensis

Manríquez¹,

Castilla²

2005

Mar. Ecol. Prog. Ser.

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The hermaphroditic broadcasting tunicate Pyura chilensis Molina, 1782 is a sessile filter-feeder organism that occurs in intertidal and subtidal habitats along the Chilean and Peruvian coast. In natural populations, P. chilensis form dense aggregations, small patches or occur as isolated individuals. This suggests that self-fertilization could be a potential insurance against adverse conditions for cross-fertilization. In this study, P. chilensis were reared in the laboratory as isolated and paired individuals, to assess occurrence and success of fertilization, settlement and metamorphosis. Occurrence of self-fertilization was also compared between specimens forced to cross-fertilize and specimens maintained in reproductive isolation for different periods. We also manipulated cross-and self-fertilization using strip-spawned gametes. Our study shows that P. chilensis is a hermaphroditic species with adolescent gonochorism; that is, individuals first developed male function and then later male and female functions simultaneously as specimens increased in size (protandrous hermaphroditism). The results also show more frequent fertilization in paired specimens and in manipulated fertilization involving cross sperm. Moreover, no perceptible differences in fertilization, settlement, and metamorphosis success among self and outcross progeny were found. Prolonged periods of reproductive isolation resulted in more frequent self-fertilization. Occurrence of selfing and highly successful settlement and metamorphosis of progeny originating from reproductively-isolated specimens suggest that even though outcrossing predominates, selfing is an advantageous alternative when sources of allosperm are scarce.

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“…Such a trend in Q. petrea in a particular context could be regarded as part of its strategy in progressively replacing Q. robur in successional forest development. Differences in sex allocation in dioecious and monoecious plant species are reported and depend on many different factors [8,9,13,18]. Monoecious, wind-pollinated plant species are expected to exhibit a higher relative investment in male sex because the threat of losing large amounts of pollen during pollination is high.…”

Section: Discussionmentioning

confidence: 99%

Unexpected disproportion observed in species composition between oak mixed stands and their progeny populations

Dering

Lewandowski

2007

Ann. For. Sci.

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-We used morphological analysis to assess species composition of natural regenerations and progeny plantations established from two mixed oak stands in Jamy and Legnica, Poland. Despite equal proportions of pedunculate (Quercus robur) and sessile oak (Quercus petrea) in seed stands, the species composition differed strikingly. In all progeny populations, pedunculate oak dominated, reaching 89.5% and 96.6% in Legnica and Jamy, respectively. However, sessile oak predominated in natural regenerations. Morphological studies indicated a varied number of phenotypically intermediate or mosaic individuals. Among artificial populations, the highest number of putative hybrids was observed in Legnica (average 2.5%) and the lowest in Jamy (average 0.2%). Hybrids in natural regeneration were 1% in Legnica and 8% in Jamy. The disproportionate species composition could result from either unintentional indirect acorn selection during collection or selection in nursery practice. We discuss the role of ecophysiological differences between species in biased species representation in progeny populations.Q. robur / Q. petrea / mixed stand / progeny plantation / hybridization Résumé -Disproportion inattendue dans la composition spécifique observée entre des peuplements mélangés de chêne et leurs descendances. Nous avons utilisé des analyses de caractères morphologiques pour déterminer la composition spécifique dans des régénérations naturelles et dans des plantations de chêne, issues de deux peuplements mélangés à Jamy et Legnica, Pologne. Malgré des proportions égales entre chêne pé-donculé (Quercus robur) et chêne sessile (Quercus petrea) dans les peuplements semenciers, la composition spécifique y est étonnamment différente. Dans toutes les plantations, le chêne pédonculé domine et atteint des proportions de 89,5 % et 96,6 % à Legnica et Jamy respectivement. Cependant, le chêne sessile prédomine dans les régénérations naturelles. Les analyses morphologiques indiquent un nombre variable d'individus phénotypiquement intermédiaires ou mosaïques. Parmi les peuplements artificiels, le plus grand nombre d'hybrides putatifs est observé à Legnica (en moyenne 2,5 %) et le plus faible à Jamy (0,2 % en moyenne). Dans les régénérations naturelles, les hybrides représentent 1 % à Legnica et 8 % à Jamy. Ces différences pourraient résulter soit d'une sélection indirecte involontaire des glands lors de la récolte soit d'une sélection lors de l'élevage en pépinière. Nous discutons aussi du rôle des différences écophysiologiques entre les espèces dans la représentation biaisée des espèces dans les plantations.Q. robur / Q. petrea / peuplement mélangé / descendance / hybridation

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Variation in Floral Sex Allocation in Polygonatum odoratum (Liliaceae)

Cited by 30 publications

References 44 publications

Primary floral allocation per flower in 12 Pedicularis (Orobanchaceae) species: significant effect of two distinct rewarding types for pollinators

Primary floral allocation per flower in 12 Pedicularis (Orobanchaceae) species: significant effect of two distinct rewarding types for pollinators

Self-fertilization as an alternative mode of reproduction in the solitary tunicate Pyura chilensis

Unexpected disproportion observed in species composition between oak mixed stands and their progeny populations

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