UT Arlington BIOL BIOL 3427 - Embryo (3 pages)

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Embryo



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Embryo

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Pages:
3
School:
University of Texas at Arlington
Course:
Biol Biol 3427 - Plant Science
Plant Science Documents

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EMBRYO DEVELOPMENT When a pollen grain fertilizes an ovule inside of the ovary development of the embryo begins Embryonic development occurring within the growing seed creates a new individual from a fertilized egg The embryo goes through several increasingly complex stages as its mitotic divisions continue These stages include the early proembryo the globular stage the heart stage cotyledons begin to emerge the torpedo stage differentiation of the vascular tissues begin and finally the mature embryo The endosperm of most developing seeds is at first non cellular or liquid In both corn and coconuts a portion of the endosperm remains liquid after the outer part of the endosperm has become cellular After the endosperm has become cellular it begins to convert available nutrients into insoluble reserves such as starch proteins and vegetable oils storing up these products for the future use of the embryo during seed germination The final important feature of embryo development within the seed is the cessation of growth when the embryo attains full size This is commonly called embryo dormancy This is a temporary physiologically imposed dormancy If it fails the embryo continues to grow and the seed germinates within the fruit the seed becoming useless as a means of reproduction 1 Obtain slides of various stages of Capsella embryo development Identify as many of the following stages as you can globular heart shaped torpedo and mature 2 Compare what you see to slide pictures of embryo development 3 Examine a prepared slide of a corn grain Identify the endosperm cotyledon coleoptile root root cap coleorhizae and shoot apical meristem Seedling Development A typical seed consists of 1 Embryo the young plant within the seed consisting of a Epicotyl will form the leaf of the new plant b Hypocotyl will form the stem of the new plant c Radicle will form the root of the new plant 2 Endosperm food reserve derived from fertilized polar nuclei 3 Cotyledons will serve as food for the



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