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Plant Cells

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Plant Cells

Why do plant cells look like little rectangles?

A section of a pine embryo. Notice how all the cells seem to stack on each other, with no spaces in between. MIght this allow the cells to form structures that can grow upright?

Organs in Plants?

Your body includes organ systems, such as the digestive system, made of individual organs, such as the stomach, liver, and pancreas, which work together to carry out a certain function (in this case, breaking down and absorbing food). These organs, in turn, are made of different kinds of tissues, which are groups of cells which work together to perform a specific job. For example, your stomach is made of muscle tissue to facilitate movement and glandular tissue to secrete enzymes for chemical breakdown of food molecules. These tissues, in turn, are made of cells specialized in shape, size, and component organelles, such as mitochondria for energy and microtubules for movement.

Plants, too, are made of organs, which in turn are made of tissues. Plant tissues, like ours, are constructed of specialized cells, which in turn contain specific organelles. It is these cells, tissues, and organs that carry out the dramatic lives of plants.

Plant Cells

Plant cells resemble other eukaryotic cells in many ways. For example, they are enclosed by a plasma membrane and have a nucleus and other membrane-bound organelles. A typical plant cell is represented by the diagram in Figure below .

Parts of a plant cell

Plant cells have all the same structures as animal cells, plus some additional structures. Can you identify the unique plant structures in the diagram?

Plant Cell Structures

Structures found in plant cells but not animal cells include a large central vacuole, cell wall, and plastids such as chloroplasts.

  • The large central vacuole is surrounded by its own membrane and contains water and dissolved substances. Its primary role is to maintain pressure against the inside of the cell wall, giving the cell shape and helping to support the plant.
  • The cell wall is located outside the cell membrane. It consists mainly of cellulose and may also contain lignin , which makes it more rigid. The cell wall shapes, supports, and protects the cell. It prevents the cell from absorbing too much water and bursting. It also keeps large, damaging molecules out of the cell.
  • Plastids are membrane-bound organelles with their own DNA. Examples are chloroplasts and chromoplasts. Chloroplasts contain the green pigment chlorophyll and carry out photosynthesis . Chromoplasts make and store other pigments. They give flower petals their bright colors.

Types of Plant Cells

There are three basic types of cells in most plants. These cells make up ground tissue, which will be discussed in another concept. The three types of cells are described in Table below . The different types of plant cells have different structures and functions. See Vascular Plant Tissues at http://www.youtube.com/watch?v=1HV8PdXLzy8 for additional information.

Type of Cell Structure Functions Example
Parenchymal

cube-shaped

loosely packed

thin-walled

relatively unspecialized

contain chloroplasts

photosynthesis

cellular respiration

storage

food storage tissues of potatoes

Collenchymal

elongated

irregularly thickened walls

support

wind resistance

strings running through a stalk of celery

Sclerenchymal very thick cell walls containing lignin

support

strength

tough fibers in jute (used to make rope)

Summary

  • Plants have eukaryotic cells with large central vacuoles, cell walls containing cellulose, and plastids such as chloroplasts and chromoplasts.
  • Different types of plant cells include parenchymal, collenchymal, and sclerenchymal cells. The three types differ in structure and function.

Practice

Use this resource to answer the questions that follow.

  1. What are the three distinct types of tissues found in plants?
  2. Which tissue forms the majority of a plant? What are the three types of this tissue, and what are their roles?

Review

1. Identify three structures found in plant cells but not animal cells. What is the function of each structure?

2. Describe parenchymal plant cells and state their functions.

Vocabulary

cell wall

cell wall

Rigid layer that surrounds the plasma membrane of a plant cell; helps support and protect the cell; also characteristic of many prokaryotes.
cellulose

cellulose

Carbohydrate component of cell walls; characteristic of eukaryotic cell walls.
central vacuole

central vacuole

Large saclike organelle in plant cells; stores substances such as water; helps keep plant tissues rigid.
chloroplast

chloroplast

Organelle in the cells of plants and algae; site of photosynthesis.
collenchymal

collenchymal

Type of plant cell, used for support and wind resistance.
lignin

lignin

Tough, hydrophobic carbohydrate molecule that stiffens and waterproofs vascular tissues of plants.
parenchymal

parenchymal

Type of plant cell; used in photosynthesis, cellular respiration, and storage.
plastid

plastid

A group of closely related membrane-bound plant cell organelles; includes chloroplasts, chromoplasts and leucoplasts.
sclerenchyma

sclerenchyma

Type of plant cell; used for support and strength.
chlorophyll

chlorophyll

Green pigment in a chloroplast that absorbs sunlight, starting the light reactions of photosynthesis.
photosynthesis

photosynthesis

Process of using the energy in sunlight to make food (glucose).

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