The evolution of fertilization modes independent of the micropyle in Fagales and `pseudoporogamy'

Sogo, Akiko; Tobe, Hiroshi

doi:10.1007/s00606-006-0409-x

Cited by 15 publications

(10 citation statements)

References 14 publications

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“…Thus far, we have accumulated data on the mode of pollen tube growth for five of the eight families of the Fagales (Sogo et al. , 2004a, b; Sogo & Tobe, 2005, 2006a, b, c). Studies on the remaining families, that is, Juglandaceae, Rhoipteleaceae and Nothofagaceae, would allow us to make an extensive comparison and evaluate how the mode of pollen tube growth has evolved, which would also reflect the phylogenetic relationships in the order Fagales.…”

Section: Discussionmentioning

confidence: 99%

“…Figure 23 is an improved diagram of information presented in a previous paper (Sogo & Tobe, 2006b), emphasizing the distribution of chalazogamy in a phylogenetic tree of the Fagales [data of the outgroups Hamamelis and Celtis were obtained from Mathew (1980) and Dottori (1994), respectively]. The figure shows that porogamy is a plesiomorphy in the Fagales, although this has yet to be confirmed in Nothofagus , and that chalazogamy is an apomorphy gained once in a common ancestor of the Juglandaceae, Rhoipteleaceae, Myricaceae, Betulaceae, Ticodendraceae and Casuarinaceae.…”

Section: Discussionmentioning

confidence: 99%

“…The figure shows that porogamy is a plesiomorphy in the Fagales, although this has yet to be confirmed in Nothofagus , and that chalazogamy is an apomorphy gained once in a common ancestor of the Juglandaceae, Rhoipteleaceae, Myricaceae, Betulaceae, Ticodendraceae and Casuarinaceae. Chalazogamy, concomitant with delayed fertilization and/or intermittent pollen tube growth in pistils, may have evolved in response to the requirement for a nutrition source by the pollen tubes remaining within a pistil for a long period before fertilization and after pollination (Sogo & Tobe, 2006b). This fertilization mode is now strictly preserved in a lineage of the Casuarinaceae, Ticodendraceae and Betulaceae, all possessing anatropous ovules with a massive chalaza.…”

Section: Discussionmentioning

confidence: 99%

“…In a series of previous papers, we reported diverse modes of pollen tube growth in pistils of the Fagales: Casuarinaceae (Sogo, Jaffré & Tobe, 2004a; Sogo et al. , 2004b), Betulaceae (Sogo & Tobe, 2005), Myricaceae (Sogo & Tobe, 2006a, b) and Fagaceae (Sogo & Tobe, 2006c). In the Fagales (at least in the Betulaceae, Casuarinaceae, Fagaceae and Myricaceae), fertilization is delayed for a period between 2 weeks and 15 months after pollination as a result of the retarded development of ovules or embryo sac(s) (Benson, 1894; Swamy, 1948; Stairs, 1964; Boavida, Varela & Feijo, 1999; Williams, Friedman & Arnold, 1999; for a review see Sogo & Tobe, 2006c).…”

Section: Introductionmentioning

confidence: 99%

“…As Ticodendron is phylogenetically assigned to the same clade as the Betulaceae and Casuarinaceae (Li et al. , 2004), both of which show chalazogamy (for review see Sogo & Tobe, 2006b), Ticodendron is also likely to display chalazogamy. This, however, requires confirmation, as the Betulaceae and Casuarinaceae have similar modes of pollen tube growth in the pistils but differ in the details of pollination.…”

Section: Introductionmentioning

confidence: 99%

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Mode of pollen tube growth in pistils ofTicodendron incognitum(Ticodendraceae, Fagales) and the evolution of chalazogamy

Sogo

Tobe

2008

Botanical Journal of the Linnean Society

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Ticodendron incognitum is the sole species of the Ticodendraceae, which was established as a new family in the Fagales less than 20 years ago. Considering the diverse modes of pollen tube growth observed in other Fagales, we investigated the growth of pollen tubes in the pistil of Ticodendron. At the time of pollination, T. incognitum had four immature ovules in a bilocular ovary, thus exhibiting delayed fertilization, as in other Fagales. During the period when fertilization was delayed, pollen tube growth in the pistil was intermittent, consisting of five steps associated with development of the ovules and embryo sacs. Four cessation sites occurred: in the style, in the tissue of the upper part of the ovary, inside and outside of the funicle and at the chalaza. A single pollen tube eventually reaches a mature embryo sac through the chalaza in one of the four ovules. While both delayed fertilization and intermittent pollen tube growth play a role in male and female gametophyte selection, as in other Fagales, the five‐step process of pollen tube growth through the chalaza (i.e. chalazogamy) is characteristic of lineages of the Casuarinaceae, Ticodendraceae and Betulaceae (the latter with the loss of one step). © 2008 The Linnean Society of London, Botanical Journal of the Linnean Society, 2008, 157, 621–631.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%