Pollination ecology of Polylepis Tomentella (Rosaceae), an andean anemophilous tree presenting a potential floral fungal infection

Alejandra I. Domic, Peter Bernhard, Retha Edens-Meier, Gerardo R. Camilo, Jose Mariano Capriles Flores

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Premise of research. Anemophily is considered to be a mechanism that evolved to promote pollination success. However, reproductive output can decrease if pollen loads are scarce due to low abundance of compatible mates or floral infections. Here we analyze the effects of breeding system, pollen limitation, and a potential floral fungal infection on the reproductive output of the Andean tree Polylepis tomentella (Rosaceae). Methodology. We performed pollen supplementation experiments in the field to assess the extent of the effect of pollen limitation on fruit and seed set and to identify any pre-or postzygotic self-incompatibility responses within receptive pistils. Supplementary scanning electron microscopy and epifluorescence microscopy were used to observe the possible effects of a potential floral fungal infection on sexual reproduction. Pivotal results. Pollen supplementation did not increase fruit and seed set, suggesting weak evidence of pollen limitation. Most stigmas from self-and cross-pollinated flowers showed germinated pollen grains and pollen tubes in the style, indicating that the species exhibits prezygotic self-compatibility. The presence of three Ascomycota genera in stigmas and styles appears to have negatively affected the germination of pollen grains by inhibiting pollen tube growth, but we did not find evidence suggesting that hyphae are able to penetrate the ovary. Conclusions. This study showed that P. tomentella possesses a prezygotic self-compatible system and that fruit and seed set are not affected by pollen limitation. Therefore, reproductive assurance is achieved through pollen transfer between plants by wind and the role played by self-compatibility that allows selfing in the species. However, it is possible that the potential fungal infection could reduce the fecundity of its tree host, as hyphae are able to penetrate pollen grains.

Original languageEnglish (US)
Pages (from-to)512-521
Number of pages10
JournalInternational journal of plant sciences
Volume178
Issue number7
DOIs
StatePublished - Sep 1 2017

Fingerprint

Tomentella
Rosaceae
pollination
pollen
ecology
pollen limitation
infection
fruit set
seed set
anemophily
pollen tubes
stigma
hyphae
reproductive performance
self incompatibility
autogamy
sexual reproduction
reproductive strategy
pistil
fecundity

All Science Journal Classification (ASJC) codes

  • Ecology, Evolution, Behavior and Systematics
  • Plant Science

Cite this

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title = "Pollination ecology of Polylepis Tomentella (Rosaceae), an andean anemophilous tree presenting a potential floral fungal infection",
abstract = "Premise of research. Anemophily is considered to be a mechanism that evolved to promote pollination success. However, reproductive output can decrease if pollen loads are scarce due to low abundance of compatible mates or floral infections. Here we analyze the effects of breeding system, pollen limitation, and a potential floral fungal infection on the reproductive output of the Andean tree Polylepis tomentella (Rosaceae). Methodology. We performed pollen supplementation experiments in the field to assess the extent of the effect of pollen limitation on fruit and seed set and to identify any pre-or postzygotic self-incompatibility responses within receptive pistils. Supplementary scanning electron microscopy and epifluorescence microscopy were used to observe the possible effects of a potential floral fungal infection on sexual reproduction. Pivotal results. Pollen supplementation did not increase fruit and seed set, suggesting weak evidence of pollen limitation. Most stigmas from self-and cross-pollinated flowers showed germinated pollen grains and pollen tubes in the style, indicating that the species exhibits prezygotic self-compatibility. The presence of three Ascomycota genera in stigmas and styles appears to have negatively affected the germination of pollen grains by inhibiting pollen tube growth, but we did not find evidence suggesting that hyphae are able to penetrate the ovary. Conclusions. This study showed that P. tomentella possesses a prezygotic self-compatible system and that fruit and seed set are not affected by pollen limitation. Therefore, reproductive assurance is achieved through pollen transfer between plants by wind and the role played by self-compatibility that allows selfing in the species. However, it is possible that the potential fungal infection could reduce the fecundity of its tree host, as hyphae are able to penetrate pollen grains.",
author = "Domic, {Alejandra I.} and Peter Bernhard and Retha Edens-Meier and Camilo, {Gerardo R.} and {Capriles Flores}, {Jose Mariano}",
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Pollination ecology of Polylepis Tomentella (Rosaceae), an andean anemophilous tree presenting a potential floral fungal infection. / Domic, Alejandra I.; Bernhard, Peter; Edens-Meier, Retha; Camilo, Gerardo R.; Capriles Flores, Jose Mariano.

In: International journal of plant sciences, Vol. 178, No. 7, 01.09.2017, p. 512-521.

Research output: Contribution to journalArticle

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AU - Domic, Alejandra I.

AU - Bernhard, Peter

AU - Edens-Meier, Retha

AU - Camilo, Gerardo R.

AU - Capriles Flores, Jose Mariano

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