Angiosperm Plant Body - Botany - Lecture Slides, Slides for Botany. Central University of Haryana

Botany

Description: These are the important key points of lecture slides of Botany are:Angiosperm Plant Body, Structure and Development, Formation of Embryo, Mature Embryo and Seed, Embryo to Adult, Outer Layers of Diploid, Wall of Megasporangium, Megagametophyte of Angiosperms, Embryo Development, Embryo Proper
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Slide 1

The Angiosperm Plant Body

• Structure and development – Formation of embryo – Mature embryo and seed – Embryo to adult

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In most angiosperms, the ovule consists of three layers of tissue: 1.Integuments - two outer layers of diploid (2N) tissue that will develop into the seed coat. 2.Nucellus - the wall of megasporangium, also diploid (2N). 3.Embryo sac - also call the megagametophyte of angiosperms, consists of only 7 cells. Contains 8 haploid nuclei in all.

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“Polarity” -Apical- basal pattern - Radial pattern

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Embryo development

• Orderly cell division • Differentiation leads into

two distinct parts – Embryo proper – The suspensor

Before this stage is reached

the developing embryo is referred to as the proembryo

Becomes food nourishing component

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Stage of embryo development preceding cotyledon development

• Globular stage- embryo proper (proembryo) is spherical

• Heart stage (dicots only)- seed leaf (cotyledon) development

• Torpedo stage- apical basal pattern just prior to germination

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Stages of embryo development

Stages of embryo development

Globar stage

Heart stage (dicot only)

Torpedo stage

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Embryo proper will become - meristemic tissue

Future Epidermis

Future Ground meristem (ground) and Procambium (vascular)

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Forms the seed coat

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(Precursor to vascular) Docsity.com

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(nucellar tissue)

(Embryonic root) Docsity.com

Lets look at Seed of some common dicots and monocots

• Garden bean • Castor bean • Onion • Maize

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