Growing Plants

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6

Cuttings

They can be placed in moist

soil or water (and sometimes

dipped in rooting

powder).

Cuttings are small pieces of stem with some leaves attached, the new plant grows from this.

Slide 54

Grafting

A cut stem of one plant (with good flower or fruit growth) (the graft) is taken and firmly attached to the rootstock of another plant (which has a strong, established root system) (the stock).

Examples- roses, fruit trees

Slide 55

Grafting- advantages

Allows you to clone the commercial qualities of a particular fruit variety on another tree. Seed trees have highly variable fruit quality.

They come into production much earlier (2-3 years) than trees grown from seed (5-10 years).

Slide 56

Activity

World of Plants Workbook p42

The effect of rooting powder on cuttings

Collect some graph paper and work through the problem solving activity

Slide 57

Activity

World of plants workbook p33

“Artificial propagation- commercial advantages”

Read page. Collect Information sheet

Write short notes on it.

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Commercial aspects

Artificial propagation has allowed us to adapt and improve plants for our own use.

Some of the benefits include:

Quick production of large numbers of genetically identical plants.

Specific varieties, desired features or consistent quality can be produced especially in fruit, flowers.

Slide 59

Quick Test-C

How many parents are involved in asexual reproduction?

Name 3 ways in which plants reproduce asexually.

Give 2 examples of plants that reproduce asexually by producing runners.

What term is used to describe a population of genetically identical plants?

Name 2 common methods of artificial propagation.

Give the commercial advantages of artificial propagation.

One

Runners, tubers, bulbs

Spider plant, strawberry

Clones

Cuttings, grafting

Quick method, producing large numbers of plants, of known quality and specific variety