Pollen Fertility and Flowering Phenology in an Androdioecious Tree, Fraxinus lanuginosa (Oleaceae), in Hokkaido, Japan

Ishida, Kiyoshi; Hiura, Tsutom

doi:10.1086/297614

Cited by 21 publications

(23 citation statements)

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“…This is inconsistent with an interpretation of functional androdioecy, in which males must be the minority gender (see Pannell 2002b), and it strongly implicates cryptic dioecy, with hermaphrodites that are, in fact, functionally female (Charlesworth 1984;Mayer & Charlesworth 1991). However, studies of F. ornus (Dommée et al 1999, and this paper), and the related F. lanuginosa (Ishida & Hiura 1998) and Phillyrea angustifolia (Lepart & Dommée 1992;Traveset 1994;Vassiliadis et al 2000), have found that, although pollen produced by hermaphrodites is less able to fertilize ovules than that produced by males, hermaphrodites can, and do, sire seeds. Indeed, in a paternity analysis within a small population of P. angustifolia, Vassiliadis et al (2002) recently showed that hermaphrodites actually sired as many seeds as did males under natural pollination conditions.…”

Section: Introductioncontrasting

confidence: 60%

Paternal effects on functional gender account for cryptic dioecy in a perennial plant

Verdú

Montilla

Pannell

2004

Proc. R. Soc. Lond. B

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Natural selection operates on the mating strategies of hermaphrodites through their functional gender, i.e. their relative success as male versus female parents. Because functional gender will tend to be strongly influenced by sex allocation, it is often estimated in plants by counting seeds and pollen grains. However, a plant's functional gender must also depend on the fate of the seeds and pollen grains it produces. We provide clear evidence of a paternal effect on the functional gender of a plant that is independent of the resources invested in pollen. In the Mediterranean tree Fraxinus ornus, males coexist with hermaphrodites that disperse viable pollen and that sire seeds; the population would thus appear to be functionally androdioecious. However, we found that seedlings sired by hermaphrodites grew significantly less well than those sired by males, suggesting that hermaphrodites may be functionally less male than they seem. The observed 1 : 1 sex ratios in F. ornus, which have hitherto been difficult to explain in the light of the seed-siring ability of hermaphrodites, support our interpretation that this species is cryptically dioecious. Our results underscore the importance of considering progeny quality when estimating gender, and caution against inferring androdioecy on the basis of a siring ability of hermaphrodites alone.

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Section: Introductioncontrasting

confidence: 60%

Paternal effects on functional gender account for cryptic dioecy in a perennial plant

Verdú

Montilla

Pannell

2004

Proc. R. Soc. Lond. B

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“…Ishida & Hiura (1998) achieved satisfactory pollen germination of F. lanuginosa Koidz. on a media of 5% and 10% sucrose.…”

Section: Discussionmentioning

confidence: 95%

Pollen germination and pollen tube growth in Fraxinus pennsylvanica

Kremer

Jemrić

2006

Biologia

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With regard to adaptation of green ash (Fraxinus pennsylvanica MARSHALL) to ecological conditions in Croatia, pollen germination and pollen tube length after 2, 4 and 6 hours were examined in vitro at 10, 15, 20 and 25 • C (518.90 µm) after 6 hours. It can be concluded that green ash pollen has satisfactory germination in ecological conditions in Croatia and that the optimum temperature for pollen germination is higher than 20• C.

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“…Thus, androdioecy is not strict in the Spanish populations studied by Traveset (1994). In Fraxinus lanuginosa (Oleaceae), a wind-pollinated and insect-pollinated tree that exhibits strong selfsterility, seed set after outcrossing, with pollen from hermaphrodites, is 2.7 times lower than outcrossing with pollen from males (Ishida & Tsutom, 1998), and hermaphrodite inflorescences have one-third as many flowers as do male inflorescences (Hiura & Ishida, 1994).…”

Section: mentioning

confidence: 99%

Androdioecy in the entomophilous tree Fraxinus ornus (Oleaceae)

et al. 1999

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Androdioecy (the coexistence of two genders, cosexuals and males, in a single population) is a rare breeding system. In terms of functional gamete production, androdioecy has been reported in a small number of windpollinated and insect-pollinated species. In this study we examine the floral biology, stability of gender, and fruit and seed production after self-pollination and outcrossing pollination in a potentially androdioecious tree, Fraxinus ornus, in southern France. Individual trees have either hermaphrodite flowers or male flowers, the latter lacking a well-developed gynoecium. The two genders produce morphologically similar pollen and were present in 1 : 1 or slightly male-biased ratios. Only hermaphrodites set fruit during 2-4 yr of observation at four different sites in southern France. Experimental pollinations of eight trees in two different sites showed that hermaphrodites produce viable pollen in dehiscent anthers and viable seeds. Thus, in terms of functional gamete production, F. ornus is a new case of functional androdioecy. Seven hermaphrodites were self-compatible, and such self-compatibility of hermaphrodites might improve the colonizing ability of F. ornus in a region where this species is actively expanding its range.

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Pollen Fertility and Flowering Phenology in an Androdioecious Tree, Fraxinus lanuginosa (Oleaceae), in Hokkaido, Japan

Cited by 21 publications

References 0 publications

Paternal effects on functional gender account for cryptic dioecy in a perennial plant

Paternal effects on functional gender account for cryptic dioecy in a perennial plant

Pollen germination and pollen tube growth in Fraxinus pennsylvanica

Androdioecy in the entomophilous tree Fraxinus ornus (Oleaceae)

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