Embryology of Althaea rosea (L.) Cav.: stigma, megasporogenesis and the female gametophyte development
2002
Szczuka, E. | Szozda, A.,Uniwersytet Marii Curie-Sklodowskiej, Lublin (Poland). Zaklad Anatomii i Cytologii Roslin | Gielwanowska, I.,Uniwersytet Warminsko-Mazurski, Olsztyn (Poland). Zaklad Mikologii
Althaea rosea [Alcea rosea], originating from Asia, is grown as an ornamental plant in Europe. The stigma of this plant is dry type. The level of stigma maturity was observed at three developmental stages: (1) the stage of a green, closed bud, (2) the stage of anthesis and (3) the stage one day after anthesis. The stigmas at the 3 investigated stages were subjected to the following cytochemical tests: detecting pectins (ruthen red), insoluble polysaccharides (PAS reaction), cellulose (calcofluor white), callose (aniline blue) and acid phosphatase (Gomory's reaction). The effects of the tests changed according to the degree of stigma maturity. Megasporogenesis and embryo sac development are parallel to the processes of the stigma and flower maturity. The embryo sac develops according to the monosporic and then Polygonum type. The mature embryo sac consists of seven cells (egg apparatus formed by egg cell and two synergids, three-celled antipods and central cell). In the paper, the stages of megasporogenesis and embryo sac development are shown
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