BIOSC-101 Lecture Notes - Lecture 19: Charophyta, Gametangium, Phragmoplast
21 Dec 2020
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Plant diversity i you should be able to: Describe three shared characteristics and five distinct characteristics between charophytes and land plants. Land plants share three key traits with only charophytes. Cells of both plants and charophytes have distinctive circular rings of proteins embedded in the plasma membrane. These protein rings synthesize the cellulose microfibrils of the cell wall. Particular details of cell division occur only in plants and certain charophytes i. e. a group of microtubules known as phragmoplast forms between the daughter nuclei of a dividing cell. A cell plate then develops across the midline of the dividing cell. Five key traits appear in nearly all land plants but are absent in the charophytes. A reproductive cycle that alternates between two generations of distinct multicellular organisms: gametophytes and sporophytes (not diploid and haploid: multicellular, dependent embryos. Land plants are called embryophytes because of the dependency of the embryo. The diploid embryo is retained within the tissue of the female gametophyte.
