Introduction. What is plant propagation? Can be done in one of two ways. The reproduction or increasing in number of plants. Sexual. Asexual.
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1 Plant Propagation
2 Introduction What is plant propagation? The reproduction or increasing in number of plants. Can be done in one of two ways. Sexual. Asexual.
3 Sexual Propagation The propagation or reproducing of plants from seeds.
4 Plant Reproduction Home Page 1 4 Flower structure Seed dispersal 2 5 Pollination Germination 3 6 Fruit development Test ClickBiology
5 Flowers are the reproductive organs of plants Flower Structure Pollination Fertilisation Seed Dispersal Germination Test ClickBiology
6 Use the diagram below to complete the labels on the flower structure worksheet stigma stamen anther filament style ovary carpel ovule petal sepal peduncle receptacle Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
7 stigma stamen anther filament style ovary carpel ovule petal sepal peduncle receptacle Flower Structure Pollination Fertilisation Seed Dispersal Germination Test ClickBiology
8 Pollination The pollen grain contains the male sex cell (gamete) Flower Structure Pollination Fertilisation Seed Dispersal Germination Test ClickBiology
9 Pollination is the transfer of pollen from the anther to the stigma This is an example of cross-pollination as the pollen travels from one flower to a different flower. This is desirable in plants as it promotes variation. Flower Structure Pollination Fertilisation Seed Dispersal Germination Test ClickBiology
10 Self-pollination occurs when pollen falls from the anther onto the stigma of the same flower Self-pollination is not desirable as it reduces variation Flower Structure Pollination Fertilisation Seed Dispersal Germination Test ClickBiology
11 Fertilisation and Fruit Development Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
12 Once pollination occurs a tube grows from the pollen grain down through the style to the ovule stigma style carpel ovary ovule Note: Petals not shown in order to simplify diagram Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
13 Fertilisation occurs when the male gamete fuses with the ovule (the female gamete) Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
14 Seed Dispersal Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
15 After fertilisation the petals, stamen and sepals fall off. The ovule turns into a seed, the fertilised egg inside develops into an embryo plant. Testa: tough seed coat Cotyledon: Food store Micropyle: Hole made by pollen tube Plumule: Embryo shoot Radicle: Embryo root Embryo plant Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
16 Water leaves the seed, it dehydrates and becomes dormant because metabolic reactions stop. The ovary develops to become a fruit. seed Fleshy wall of the ovary (yes, you are eating an adapted ovary when you crunch into an apple! Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
17 Seeds need to be dispersed away from the parent plant in order to reduce competition for space, light, nutrients and water. Seeds can be dispersed by: Wind Water Mechanical Animals ClickBiology
18 Germination Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
19 The seed contains the embryo plant and cotyledons (starch stores) Plumule (embryo shoot) Radicle (embryo root) Test a Water enters the seed through the micropyle and activates enzymes. The water also softens the testa to allow it to split. Micropyle Cotyledon Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
20 Enzymes are used in seed germination Plumule embryo plant amylase secreted starch maltose The enzymes break starch down into maltose and then glucose. The glucose is used in respiration to provide energy for growth Radicle This is the first part to grow out of the seed as it needs to absorb more water Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
21 Whilst germinating the plant uses food stores in the cotyledon to provide energy for growth light The seedling can now photosynthesise and make its own food germination soil Plant growth and development Flower Structure Pollination Fruit Development Seed Dispersal Germination Test ClickBiology
22 Transplanting Seedlings Seedlings are the small plants. Transplant when first true leaves appear Held by the true leaves rather than the stems to prevent stem bruising which will kill the plant.
23 Hardening Off The reducing of humidity and water to make the environment more like the outside.
24 Pelletized seeds Seed tapes
25 Disadvantages of Sexual Propagation Some plants, especially hybrids, do not reproduce true to parents. Some plants are difficult to propagate from seeds.
26 Asexual Propagation
27 Asexual Propagation The use of growing parts other than seeds to reproduce plants. The types are. Cuttings Layering Division/Separation Budding Grafting Tissue Culture
28 Apomixis
29 Runner
30 Sucker
31 Layering The rooting of plant parts while they are still attached to the parent plant. The types are. Air Layering. Trench Layering. Mound Layering.
32 Tip Layering
33 Simple Layering
34 Trench Layering Mother plant is bent to the ground and buried. Plants form at each node on covered stem.
35 Rooted plant is cut off at the soil level. As the season progresses, soil is added to cover the growing shoots. After 1 year, the shoots are rooted and removed from the parent plant. Mound Layering
36 Air Layering Also called Chinese propagation. Area of plant is girdled and surrounded by a moist growing medium that is sealed in polyethylene film.
37 Compound Layering
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