Resource limitation and pollen source (self and outcross) affecting seed production in two louseworts, Pedicularis siphonantha and P. longiflora (Orobanchaceae)

Yang, Chun‐Feng; Sun, Shi‐Guo; Guo, Yingshi

doi:10.1111/j.1095-8339.2005.00363.x

Cited by 38 publications

(44 citation statements)

References 52 publications

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“…Only a few empirical studies have simultaneously assessed resource and pollen limitation (Vaughton 1991;Campbell and Halama 1993;Mattila and Kuitunen 2000;Suzuki 2000;Yang et al 2005;Brookes et al 2008). Many of these studies demonstrated complex interactive effects between resource and pollen limitation of seed and fruit production, several of which are consistent with our model predictions.…”

Section: Seed Developmentsupporting

confidence: 80%

Evolutionary and Ecological Consequences of Multiscale Variation in Pollen Receipt for Seed Production

Schreiber

Rosenheim

Williams

et al. 2015

The American Naturalist

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Variation in resource availability can select for traits that reduce the negative impacts of this variability on mean fitness. Such selection may be particularly potent for seed production in flowering plants, as they often experience variation in pollen receipt among individuals and among flowers within individuals. Using analytically tractable models, we examine the optimal allocations for producing ovules, attracting pollen, and maturing seeds in deterministic and stochastic pollen environments. In deterministic environments, the optimal strategy attracts sufficient pollen to fertilize every ovule and mature every zygote into a seed. Stochastic environments select for allocations proportional to the risk of seed production being limited by zygotes or seed maturation. When producing an ovule is cheap and maturing a seed is expensive, among-plant variation selects for attracting more pollen at the expense of producing fewer ovules and having fewer resources for seed maturation. Despite this increased allocation, such populations are likely to be pollen limited. In contrast, within-plant variation generally selects for an overproduction of ovules and, to a lesser extent, pollen attraction. Such populations are likely to be resource limited and exhibit low seed-to-ovule ratios. These results highlight the importance of multiscale variation in the evolution and ecology of resource allocations.

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Section: Seed Developmentsupporting

confidence: 80%

Evolutionary and Ecological Consequences of Multiscale Variation in Pollen Receipt for Seed Production

Schreiber

Rosenheim

Williams

et al. 2015

The American Naturalist

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“…We collected these inflorescences 1 wk later and counted seed production in four flowers on each inflorescence that had experienced the treatments. Previous study has shown that ovary expansion is a reliable indicator of fertilization because of seed abortion caused by inbreeding depression in this species (Yang et al 2005). To examine the capacity for autonomous self-pollination and therefore the importance of insect visitors to pollination, we bagged one inflorescence of eight individuals.…”

Section: Pollination Treatmentsmentioning

confidence: 99%

Absence of Long‐Proboscid Pollinators for Long‐Corolla‐Tubed Himalayan Pedicularis Species: Implications for the Evolution of Corolla Length

Huang¹,

Fenster²

2007

International Journal of Plant Sciences

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JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to International Journal of Plant Sciences.The genus Pedicularis manifests great variation in corolla morphology, including corolla tube length. Previous observations conducted during daytime have documented bumblebees to be important pollinators for short-and long-tubed Pedicularis species. However, the potential role of night-flying long-proboscid insects (moths) as selective agents for the evolution of corolla length has not been determined. Three Pedicularis species, Pedicularis densispica, Pedicularis gruinea, and Pedicularis siphonantha, in montane meadows of Yunnan Province, southwestern China, have extremely divergent corolla tube lengths of 7.1, 22.0, and 50.6 mm, respectively. We find that all three species are pollinated by similar bumblebee species. Pollination treatments indicate that seed sets of inflorescences enclosed in fine-meshed nylon nets in the night are not different from open-pollinated inflorescences, but those bagged in the day have significantly decreased seed set, indicating that moth pollinators are not important for the study species. We present anatomical evidence that the loss of nectaries in long-tubed species, and hence the loss of nectar production, is a derived trait. The loss of nectaries may be a key innovation, releasing the corolla from the mechanical constraint imposed by pollinators reaching for nectar.

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“…Although the visitation rate was not very low compared with other endangered species (e.g. 1.2 times higher (per flower per day) in Cimicifuga nanchuanensis, Qi et al 1998), the geitonogamy will lead to self-fertilisation and may cause inbreeding depression in self-compatible species (Young et al 1996;Yang et al 2005). Pollination by self-pollen and geitonogamous pollen exclusively decreased the fruit set (Phase II) compared with artificial outcross pollination.…”

Section: Mating Systemmentioning

confidence: 95%

Pollination ecology of the rare desert species Eremosparton songoricum (Fabaceae)

et al. 2010

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The pollination ecology of Eremosparton songoricum (Litv.) Vass., a rare desert species endemic to central Asia, was examined by a series of observational studies and manipulative experiments in two natural populations during [2007][2008]. Results showed that the duration of flowering lasted 21 and 23 days, respectively, in Populations A and B from late May to late June in 2008. Anthesis of a single flower often lasted for 3 days. However, if pollinators were excluded, both the anthesis and stigma receptivity lasted 2 days longer. Mating-system experiment showed that E. songoricum was self-compatible and pollination success relied on pollinators. Fruit set after bagging without emasculation was 0.02 AE 0.01%. This suggested that spontaneous autogamy rarely happened. E. songoricum primarily relies on a combination of large floral display, secretion of nectar and a yellow 'nectar guide' on the standard to further attract pollinators, which may be the result of adaptation to a habitat with unreliable access to pollinators. A single flower produced~0.18 mL and 0.50 mL of nectar during 2 days in Populations A and B, respectively. The peak secretion occurred at 1300-1500 hours, which overlapped with the climax of visitation of the effective pollinators at 1300-1400 hours. There were four effective pollinators in both populations, namely Colletes popovi Nosk., Megachile terminate Morawitz, Coelioxys sp. and Bembix planifrons F.Mor. The most frequent one, Colletes popovi Nosk., was observed pollinating many flowers of the same individual plant (65.8 AE 1.1%) in Population A, suggesting that geitonogamous self-pollination is unavoidable. Inbreeding depression played a role during the period from fertilisation to fruit maturation.

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Resource limitation and pollen source (self and outcross) affecting seed production in two louseworts, Pedicularis siphonantha and P. longiflora (Orobanchaceae)

Cited by 38 publications

References 52 publications

Evolutionary and Ecological Consequences of Multiscale Variation in Pollen Receipt for Seed Production

Evolutionary and Ecological Consequences of Multiscale Variation in Pollen Receipt for Seed Production

Absence of Long‐Proboscid Pollinators for Long‐Corolla‐Tubed Himalayan Pedicularis Species: Implications for the Evolution of Corolla Length

Pollination ecology of the rare desert species Eremosparton songoricum (Fabaceae)

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