Evolutionarily stable size of a megagametophyte: Evolution of tiny megagametophytes of angiosperms from large ones of gymnosperms

Satoki Sakai

    Research output: Contribution to journalArticle

    1 Citation (Scopus)

    Abstract

    To examine the factors favoring large megagametophytes of gymnosperms and tiny ones of angiosperms, a game model for seed production was developed in which megagametophytes growing in the same female parent compete for resources provided by the parent. In the model, megagametophytes may continue to grow until seed completion or may cease to grow at a certain time and regrow at pollination or fertilization. Autonomous abortion of unpollinated or unfertilized megagametophytes may occur either at pollination or fertilization. Those megagametophytes absorb a certain amount of resources before abortion, due to constraints in the signal process, in addition to the resources absorbed before pollination or fertilization. It was found that both growth habits can be the ESS: megagametophytes continue to grow without cessation and monopolize resources, such as gymnosperms, or cease to grow until fertilization to reduce the loss of resources due to autonomous abortion, such as angiosperms. The former and the latter are the ESS if the time interval between pollination and fertilization is long and short, respectively. Thus, the fertilization interval may be a critical factor selecting for large megagametophytes of gymnosperms or tiny ones of angiosperms.

    Original languageEnglish
    Pages (from-to)539-547
    Number of pages9
    JournalEvolution
    Volume67
    Issue number2
    DOIs
    Publication statusPublished - 2013 Feb 1

    Keywords

    • Angiosperm
    • Embryo sac
    • Game theory
    • Gymnosperm
    • Megagametophyte

    ASJC Scopus subject areas

    • Agricultural and Biological Sciences(all)
    • Ecology, Evolution, Behavior and Systematics
    • Genetics

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